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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Jan. 03, 2015	Jan. 27, 2015	Jun. 27, 2014
Document and Entity Information
Entity Registrant Name	SILICON LABORATORIES INC
Entity Central Index Key	0001038074
Document Type	10-K
Document Period End Date	Jan. 03, 2015
Amendment Flag	false
Current Fiscal Year End Date	--01-03
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,981,015,271
Entity Common Stock, Shares Outstanding		42,137,503
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 141,706	$ 95,800
Short-term investments	193,489	179,593
Accounts receivable, net of allowances for doubtful accounts of $786 at January 3, 2015 and $797 at December 28, 2013	70,367	72,124
Inventories	52,631	45,271
Deferred income taxes	21,173	18,878
Prepaid expenses and other current assets	49,171	47,651
Total current assets	528,537	459,317
Long-term investments	7,419	10,632
Property and equipment, net	132,820	132,445
Goodwill	228,781	228,781
Other intangible assets, net	115,021	131,593
Other assets, net	29,983	28,382
Total assets	1,042,561	991,150
Current liabilities:
Accounts payable	38,922	22,126
Current portion of long-term debt	10,000	7,500
Accrued expenses	73,646	45,975
Deferred income on shipments to distributors	38,662	30,853
Income taxes	2,084	2,693
Total current liabilities	163,314	109,147
Long-term debt	77,500	87,500
Other non-current liabilities	43,691	55,941
Total liabilities	284,505	252,588
Commitments and contingencies
Stockholders' equity:
Preferred stock - $0.0001 par value; 10,000 shares authorized; no shares issued and outstanding
Common stock-$0.0001 par value; 250,000 shares authorized; 42,225 and 42,779 shares issued and outstanding at January 3, 2015 and December 28, 2013, respectively	4	4
Additional paid-in capital	29,501	48,630
Retained earnings	728,633	690,612
Accumulated other comprehensive loss	(82)	(684)
Total stockholders' equity	758,056	738,562
Total liabilities and stockholders' equity	$ 1,042,561	$ 991,150

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jan. 03, 2015	Dec. 28, 2013
Condensed Consolidated Balance Sheets
Accounts receivable, allowances for doubtful accounts (in dollars)	$ 786	$ 797
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000	250,000
Common stock, shares issued	42,225	42,779
Common stock, shares outstanding	42,225	42,779

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Condensed Consolidated Statements of Income
Revenues	$ 620,704	$ 580,087	$ 563,294
Cost of revenues	242,153	227,183	225,277
Gross margin	378,551	352,904	338,017
Operating expenses:
Research and development	172,985	157,799	137,952
Selling, general and administrative	154,145	130,795	114,390
Operating expenses	327,130	288,594	252,342
Operating income	51,421	64,310	85,675
Other income (expense):
Interest income	1,007	853	1,338
Interest expense	(3,154)	(3,293)	(1,149)
Other income (expense), net	(234)	157	484
Income before income taxes	49,040	62,027	86,348
Provision for income taxes	11,019	12,208	22,800
Net income	$ 38,021	$ 49,819	$ 63,548
Earnings per share:
Basic (in dollars per share)	$ 0.88	$ 1.17	$ 1.51
Diluted (in dollars per share)	$ 0.87	$ 1.14	$ 1.47
Weighted-average common shares outstanding:
Basic (in shares)	42,970	42,715	42,136
Diluted (in shares)	43,793	43,537	43,106

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 38,021	$ 49,819	$ 63,548
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	1,107	(535)	1,000
Reclassification for gains included in net income		(232)
Net changes to cash flow hedges:
Unrealized gains (losses) arising during the period	(799)	611	(956)
Reclassification for losses included in net income	618	560	2,295
Other comprehensive income, before tax	926	404	2,339
Provision for income taxes	324	142	818
Other comprehensive income	602	262	1,521
Comprehensive income	$ 38,623	$ 50,081	$ 65,069

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2011	$ 4	$ 14,749	$ 586,653	$ (2,467)	$ 598,939
Balance (in shares) at Dec. 31, 2011	42,068
Increase (Decrease) in Stockholders' Equity
Net income			63,548		63,548
Other comprehensive income				1,521	1,521
Stock issuances under employee plans, net of shares withheld for taxes		15,148			15,148
Stock issuances under employee plans, net of shares withheld for taxes (in shares)	1,560
Income tax benefit (shortfall) from stock-based awards		1,675			1,675
Repurchase of common stock		(52,611)	(9,408)		(62,019)
Repurchase of common stock (in shares)	(1,749)
Stock-based compensation		31,161			31,161
Balance at Dec. 29, 2012	$ 4	10,122	640,793	(946)	649,973
Balance (in shares) at Dec. 29, 2012	41,879
Increase (Decrease) in Stockholders' Equity
Net income			49,819		49,819
Other comprehensive income				262	262
Stock issuances under employee plans, net of shares withheld for taxes		15,301			15,301
Stock issuances under employee plans, net of shares withheld for taxes (in shares)	1,057
Income tax benefit (shortfall) from stock-based awards		(772)			(772)
Repurchase of common stock		(26,022)			(26,022)
Repurchase of common stock (in shares)	(661)
Stock-based compensation		30,753			30,753
Stock issued in business combination		19,248			19,248
Stock issued in business combination (in shares)	504
Balance at Dec. 28, 2013	$ 4	48,630	690,612	(684)	$ 738,562
Balance (in shares) at Dec. 28, 2013	42,779				42,779
Increase (Decrease) in Stockholders' Equity
Net income			38,021		$ 38,021
Other comprehensive income				602	602
Stock issuances under employee plans, net of shares withheld for taxes		13,320			13,320
Stock issuances under employee plans, net of shares withheld for taxes (in shares)	1,124
Income tax benefit (shortfall) from stock-based awards		120			120
Repurchase of common stock		(71,676)			(71,676)
Repurchase of common stock (in shares)	(1,678)
Stock-based compensation		39,107			39,107
Balance at Jan. 03, 2015	$ 4	$ 29,501	$ 728,633	$ (82)	$ 758,056
Balance (in shares) at Jan. 03, 2015	42,225				42,225

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Operating Activities
Net income	$ 38,021	$ 49,819	$ 63,548
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	12,561	13,491	13,621
Net gain on the purchase of property and equipment			(8,457)
Amortization of other intangible assets and other assets	17,923	15,911	14,154
Impairment of long-lived assets			708
Stock-based compensation expense	39,067	30,800	31,176
Income tax benefit (shortfall) from stock-based awards	489	(606)	1,827
Excess income tax benefit from stock-based awards	(632)	(290)	(1,294)
Deferred income taxes	3,054	3,319	4,725
Changes in operating assets and liabilities:
Accounts receivable	1,757	8,972	(20,743)
Inventories	(7,170)	5,588	(13,056)
Prepaid expenses and other assets	9,332	(2,514)	10,629
Accounts payable	11,475	(3,979)	7,217
Accrued expenses	27,671	463	3,247
Deferred income on shipments to distributors	7,809	(2,381)	4,623
Income taxes	(3,371)	5,189	(7,816)
Other non-current liabilities	(20,543)	(3,632)	(7,059)
Net cash provided by operating activities	137,443	120,150	97,050
Investing Activities
Purchases of available-for-sale investments	(166,094)	(213,883)	(192,450)
Proceeds from sales and maturities of available-for-sale investments	156,520	210,824	235,517
Purchases of property and equipment	(11,225)	(10,472)	(102,043)
Purchases of other assets	(5,514)	(5,939)	(8,508)
Acquisitions of businesses, net of cash acquired		(86,441)	(71,852)
Net cash used in investing activities	(26,313)	(105,911)	(139,336)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	13,320	15,301	15,148
Excess income tax benefit from stock-based awards	632	290	1,294
Repurchases of common stock	(71,676)	(26,022)	(62,019)
Proceeds from issuance of long-term debt, net			98,325
Payments on debt	(7,500)	(13,434)
Net cash used in financing activities	(65,224)	(23,865)	52,748
Increase (decrease) in cash and cash equivalents	45,906	(9,626)	10,462
Cash and cash equivalents at beginning of period	95,800	105,426	94,964
Cash and cash equivalents at end of period	141,706	95,800	105,426
Supplemental Disclosure of Cash Flow Information:
Interest paid	2,950	2,925	677
Income taxes paid	$ 11,587	3,838	$ 23,564
Supplemental Disclosure of Non-Cash Activity:
Stock issued in business combination		$ 19,248

Description of Business	12 Months Ended
Description of Business	Jan. 03, 2015
Description of Business
Description of Business	1. Description of Business Silicon Laboratories Inc. (the "Company"), a Delaware corporation, develops and markets mixed-signal analog intensive integrated circuits (ICs) for a broad range of applications for global markets. Within the semiconductor industry, the Company is known as a "fabless" company meaning that the ICs are manufactured by third-party foundry semiconductor companies.

Significant Accounting Policies	12 Months Ended
Significant Accounting Policies	Jan. 03, 2015
Significant Accounting Policies
Significant Accounting Policies	2. Significant Accounting Policies Basis of Presentation and Principles of Consolidation The Company prepares financial statements on a 52- or 53-week fiscal year that ends on the Saturday closest to December 31. Fiscal 2014 had 53 weeks with the extra week occurring in the fourth quarter of the year and ended on January 3, 2015. Fiscal 2013 and 2012 were 52-week years and ended on December 28, 2013 and December 29, 2012, respectively. The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Foreign Currency Transactions The Company's foreign subsidiaries are considered to be extensions of the U.S. Company. The functional currency of the foreign subsidiaries is the U.S. dollar. Accordingly, gains and losses resulting from remeasuring transactions denominated in currencies other than U.S. dollars are included in other income (expense), net in the Consolidated Statements of Income. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Among the significant estimates affecting the financial statements are those related to inventories, stock-based compensation, investments in auction-rate securities, acquired intangible assets, goodwill, long-lived assets and income taxes. Actual results could differ from those estimates, and such differences could be material to the financial statements. Reclassifications Certain reclassifications have been made to prior year financial statements to conform to current year presentation. Fair Value of Financial Instruments The fair values of the Company's financial instruments are recorded using a hierarchal disclosure framework based upon the level of subjectivity of the inputs used in measuring assets and liabilities. The three levels are described below: Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2—Inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3—Inputs are unobservable for the asset or liability and are developed based on the best information available in the circumstances, which might include the Company's own data. Cash and Cash Equivalents Cash and cash equivalents consist of cash deposits, money market funds and investments in debt securities with original maturities of ninety days or less when purchased. Investments The Company's investments typically have original maturities greater than ninety days as of the date of purchase and are classified as either available-for-sale or trading securities. Investments in available-for-sale securities are reported at fair value, with unrealized gains and losses, net of tax, recorded as a component of accumulated other comprehensive loss in the Consolidated Balance Sheet. Investments in trading securities are reported at fair value, with both realized and unrealized gains and losses recorded in other income (expense), net in the Consolidated Statement of Income. Investments in which the Company has the ability and intent, if necessary, to liquidate in order to support its current operations (including those with contractual maturities greater than one year from the date of purchase) are classified as short-term. The Company reviews its available-for-sale investments as of the end of each reporting period for other-than-temporary declines in fair value based on the specific identification method. The Company considers various factors in determining whether an impairment is other-than-temporary, including the severity and duration of the impairment, changes in underlying credit ratings, forecasted recovery, its intent to sell or the likelihood that it would be required to sell the investment before its anticipated recovery in market value and the probability that the scheduled cash payments will continue to be made. When the Company concludes that an other-than-temporary impairment has occurred, the Company assesses whether it intends to sell the security or if it is more likely than not that it will be required to sell the security before recovery. If either of these two conditions is met, the Company recognizes a charge in earnings equal to the entire difference between the security's amortized cost basis and its fair value. If the Company does not intend to sell a security and it is not more likely than not that it will be required to sell the security before recovery, the unrealized loss is separated into an amount representing the credit loss, which is recognized in earnings, and the amount related to all other factors, which is recorded in accumulated other comprehensive loss. Derivative Financial Instruments The Company uses derivative financial instruments to manage certain exposures to the variability of interest rates and foreign currency exchange rates. The Company's objective is to offset increases and decreases in expenses resulting from these exposures with gains and losses on the derivative contracts, thereby reducing volatility of earnings. The Company does not use derivative contracts for speculative or trading purposes. The Company recognizes derivatives, on a gross basis, in the Consolidated Balance Sheet at fair value. Cash flows from derivatives are classified according to the nature of the cash receipt or payment in the Consolidated Statement of Cash Flows. The Company uses interest rate swap agreements to manage exposure to interest rate risks. The swap agreements are designated and qualify as cash flow hedges. The effective portion of the gain or loss on the interest rate swaps is recorded in accumulated other comprehensive loss as a separate component of stockholders' equity and is subsequently recognized as interest expense in the Consolidated Statement of Income when the hedged exposure affects earnings. The Company uses foreign currency forward contracts to manage exposure to foreign exchange risk. These instruments are used to reduce the earnings impact that exchange rate fluctuations have on non-U.S. dollar balance sheet exposures. The Company recognizes gains and losses on the foreign currency forward contracts in other income (expense), net in the Consolidated Statement of Income in the same period as the remeasurement loss and gain of the related foreign currency denominated asset or liability. The Company does not apply hedge accounting to its foreign currency derivative instruments. Inventories Inventories are stated at the lower of cost, determined using the first-in, first-out method, or market. The Company writes down the carrying value of inventory to net realizable value for estimated obsolescence or unmarketable inventory based upon assumptions about the age of inventory, future demand and market conditions. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable. Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is computed using the straight-line method over the useful lives of the assets ranging from three to seven years. Leasehold improvements are depreciated over the contractual lease period or their useful life, whichever is shorter. In fiscal 2012, the Company purchased the facilities it had previously leased for its headquarters in Austin, Texas. The buildings are located on land which is leased through 2099 from a third party. The rents for these ground leases were prepaid for the term of the leases by the previous lessee. The buildings and leasehold interest in ground leases are being depreciated on a straight-line basis over their estimated useful lives of 40 years and 86 years, respectively. Business Combinations The Company records business combinations using the acquisition method of accounting and accordingly, allocates the fair value of purchase consideration to the assets acquired and liabilities assumed based on their fair values at the acquisition date. The excess of the fair value of purchase consideration over the fair value of the assets acquired and liabilities assumed is recorded as goodwill. The results of operations of the businesses acquired are included in the Company's consolidated results of operations beginning on the date of the acquisition. Long-Lived Assets Purchased intangible assets are stated at cost, net of accumulated amortization, and are amortized using the straight-line method over their estimated useful lives, ranging from four to twelve years. Fair values are determined primarily using the income approach, in which the Company projects future expected cash flows and applies an appropriate discount rate. Long-lived assets "held and used" by the Company are reviewed for impairment whenever events or changes in circumstances indicate that their net book value may not be recoverable. When such factors and circumstances exist, the Company compares the projected undiscounted future cash flows associated with the related asset or group of assets over their estimated useful lives, against their respective carrying amounts. Impairment, if any, is based on the excess of the carrying amount over the fair value of those assets and is recorded in the period in which the determination was made. The carrying value of goodwill is reviewed at least annually by the Company for possible impairment. The goodwill impairment test is a two-step process. The first step of the impairment analysis compares the fair value of the reporting unit to the net book value of the reporting unit. In determining fair value, several valuation methodologies are allowed, although quoted market prices are the best evidence of fair value. If the results of the first step demonstrate that the net book value is greater than the fair value, the Company must proceed to step two of the analysis. Step two of the analysis compares the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized equal to that excess. The Company tests goodwill for impairment annually as of the first day of its fourth fiscal quarter and in interim periods if events occur that would indicate that the carrying value of goodwill may be impaired. Revenue Recognition Revenues are generated predominately by sales of the Company's ICs. The Company recognizes revenue when all of the following criteria are met: 1) there is persuasive evidence that an arrangement exists, 2) delivery of goods has occurred, 3) the sales price is fixed or determinable, and 4) collectibility is reasonably assured. Generally, revenue from product sales to direct customers and contract manufacturers is recognized upon shipment. A portion of the Company's sales are made to distributors under agreements allowing certain rights of return and price protection related to the final selling price to the end customers. Accordingly, the Company defers revenue and cost of revenue on such sales until the distributors sell the product to the end customers. The net balance of deferred revenue less deferred cost of revenue associated with inventory shipped to a distributor but not yet sold to an end customer is recorded in the deferred income on shipments to distributors liability on the Consolidated Balance Sheet. Such net deferred income balance reflects the Company's estimate of the impact of rights of return and price protection. A small portion of the Company's revenues is derived from the sale of patents. The above revenue recognition criteria for patent sales are generally met upon the execution of the patent sale agreement. Shipping and Handling Shipping and handling costs are classified as a component of cost of revenues in the Consolidated Statements of Income. Stock-Based Compensation The Company has stock-based compensation plans, which are more fully described in Note 13, Stock-Based Compensation. The Company accounts for those plans using a fair-value method and recognizes the expense in its Consolidated Statement of Income. Research and Development Research and development costs are expensed as incurred. Research and development expense consists primarily of personnel-related expenses, including stock-based compensation, as well as new product masks, external consulting and services costs, equipment tooling, equipment depreciation, amortization of intangible assets, and an allocated portion of our occupancy costs. Assets purchased to support the Company's ongoing research and development activities are capitalized when related to products which have achieved technological feasibility or have an alternative future use, and are amortized over their estimated useful lives. Advertising Advertising costs are expensed as incurred. Advertising expenses were $1.7 million, $2.0 million and $1.7 million in fiscal 2014, 2013 and 2012, respectively. Income Taxes The Company accounts for income taxes using the asset and liability method whereby deferred tax asset and liability account balances are determined based on differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax laws and related rates that will be in effect when the differences are expected to reverse. These differences result in deferred tax assets and liabilities, which are included in the Company's Consolidated Balance Sheet. The Company then assesses the likelihood that the deferred tax assets will be realized. A valuation allowance is established against deferred tax assets to the extent the Company believes that it is more likely than not that the deferred tax assets will not be realized, taking into consideration the level of historical taxable income and projections for future taxable income over the periods in which the temporary differences are deductible. Uncertain tax positions must meet a more-likely-than-not threshold to be recognized in the financial statements and the tax benefits recognized are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon final settlement. See Note 17, Income Taxes, for additional information. Recent Accounting Pronouncements In June 2014, the Financial Accounting Standards Board (FASB) issued FASB Accounting Standards Update (ASU) No. 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period should be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Earlier adoption is permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements. In May 2014, the FASB issued FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step process to achieve that core principle. ASU 2014-09 requires disclosures enabling users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, using one of two retrospective application methods. Early application is not permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements. In April 2014, the FASB issued FASB ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update require a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results. ASU 2014-08 expands disclosure requirements about discontinued operations and adds new disclosures for individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for annual periods beginning on or after December 15, 2014, and interim periods within annual periods beginning on or after December 15, 2015. Early adoption is permitted, but only for disposals that have not been reported in financial statements previously issued. The adoption of this ASU is not expected to have a material impact on the Company's financial statements.

Earnings Per Share

12 Months Ended

Jan. 03, 2015

Earnings Per Share

Earnings Per Share

3. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Net income	$	38,021	$	49,819	$	63,548

Shares used in computing basic earnings per share		42,970		42,715		42,136
Effect of dilutive securities:
Stock options and other stock-based awards		823		822		970

Shares used in computing diluted earnings per share		43,793		43,537		43,106


Earnings per share:
Basic	$	0.88	$	1.17	$	1.51
Diluted	$	0.87	$	1.14	$	1.47

For fiscal years ended January 3, 2015, December 28, 2013 and December 29, 2012, approximately 0.1 million, 0.4 million and 0.5 million shares, respectively, were not included in the diluted earnings per share calculation since the shares were anti-dilutive.

Cash, Cash Equivalents and Investments

12 Months Ended

Jan. 03, 2015

Cash, Cash Equivalents and Investments

Cash, Cash Equivalents and Investments

4. Cash, Cash Equivalents and Investments

The Company's cash equivalents and short-term investments as of January 3, 2015 consisted of municipal bonds, money market funds, corporate bonds, commercial paper, variable-rate demand notes, certificates of deposit, asset-backed securities, international government bonds, U.S. government agency and U.S. government bonds. The Company's long-term investments consisted of auction-rate securities. In fiscal 2008, auctions for many of the Company's auction-rate securities failed because sell orders exceeded buy orders. As of January 3, 2015, the Company held $8.0 million par value auction-rate securities, all of which have experienced failed auctions. The underlying assets of the securities consisted of student loans and municipal bonds, of which $6.0 million were guaranteed by the U.S. government and the remaining $2.0 million were privately insured. As of January 3, 2015, $6.0 million of the auction-rate securities had credit ratings of AA and $2.0 million had a credit rating of A. These securities have contractual maturity dates ranging from 2033 to 2046 at January 3, 2015. The Company is receiving the underlying cash flows on all of its auction-rate securities. The principal amounts associated with failed auctions are not expected to be accessible until a successful auction occurs, the issuer redeems the securities, a buyer is found outside of the auction process or the underlying securities mature. The Company is unable to predict if these funds will become available before their maturity dates.

The Company does not expect to need access to the capital represented by any of its auction-rate securities prior to their maturities. The Company does not intend to sell, and believes it is not more likely than not that it will be required to sell, its auction-rate securities before their anticipated recovery in market value or final settlement at the underlying par value. The Company believes that the credit ratings and credit support of the security issuers indicate that they have the ability to settle the securities at par value. As such, the Company has determined that no other-than-temporary impairment losses existed as of January 3, 2015.

The Company's cash, cash equivalents and investments consisted of the following (in thousands):

	January 3, 2015
	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Fair Value
Cash and Cash Equivalents:
Cash on hand	$	52,144	$	—		$	—	$	52,144
Available-for-sale securities:
Money market funds		71,415		—			—		71,415
Certificates of deposit		7,739		—			—		7,739
Commercial paper		5,348		—			—		5,348
Municipal bonds		1,756		—			1		1,757
U.S. government agency		1,202		—			—		1,202
Corporate bonds		1,101		—			—		1,101
U.S. government bonds		1,000		—			—		1,000

Total available-for-sale securities		89,561		—			1		89,562

Total cash and cash equivalents	$	141,705	$	—		$	1	$	141,706


Short-term Investments:
Available-for-sale securities:
Municipal bonds	$	129,005	$	(25	)	$	172	$	129,152
Corporate bonds		33,043		(35	)		25		33,033
Variable-rate demand notes		12,915		—			—		12,915
Commercial paper		8,995		—			—		8,995
Asset-backed securities		5,380		(3	)		—		5,377
International government bonds		2,526		(10	)		—		2,516
U.S. government bonds		650		—			—		650
U.S. government agency		601		—			—		601
Certificates of deposit		250		—			—		250

Total short-term investments	$	193,365	$	(73	)	$	197	$	193,489


Long-term Investments:
Available-for-sale securities:
Auction rate securities	$	8,000	$	(581	)	$	—	$	7,419

Total long-term investments	$	8,000	$	(581	)	$	—	$	7,419

	December 28, 2013
	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Fair Value
Cash and Cash Equivalents:
Cash on hand	$	45,544	$	—		$	—	$	45,544
Available-for-sale securities:
Money market funds		39,538		—			—		39,538
Certificates of deposit		7,768		—			—		7,768
Commercial paper		2,499		—			—		2,499
Municipal bonds		451		—			—		451

Total available-for-sale securities		50,256		—			—		50,256

Total cash and cash equivalents	$	95,800	$	—		$	—	$	95,800


Short-term Investments:
Available-for-sale securities:
Municipal bonds	$	119,289	$	(11	)	$	182	$	119,460
Variable-rate demand notes		38,025		—			—		38,025
Corporate bonds		17,788		(4	)		60		17,844
Commercial paper		3,748		—			—		3,748
Asset-backed securities		515		—			1		516

Total short-term investments	$	179,365	$	(15	)	$	243	$	179,593


Long-term Investments:
Available-for-sale securities:
Auction rate securities	$	12,425	$	(1,793	)	$	—	$	10,632

Total long-term investments	$	12,425	$	(1,793	)	$	—	$	10,632

The available-for-sale investments that were in a continuous unrealized loss position, aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
As of January 3, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Municipal bonds	$	23,735	$	(25	)	$	—	$	—		$	23,735	$	(25	)
Corporate bonds		20,327		(35	)		—		—			20,327		(35	)
Auction rate securities		—		—			7,419		(581	)		7,419		(581	)
Asset-backed securities		5,080		(3	)		—		—			5,080		(3	)
International government bond		2,516		(10	)		—		—			2,516		(10	)

	$	51,658	$	(73	)	$	7,419	$	(581	)	$	59,077	$	(654	)

	Less Than 12 Months					12 Months or Greater					Total
As of December 28, 2013	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Municipal bonds	$	11,079	$	(11	)	$	—	$	—		$	11,079	$	(11	)
Auction rate securities		—		—			10,632		(1,793	)		10,632		(1,793	)
Corporate bonds		2,605		(4	)		—		—			2,605		(4	)

	$	13,684	$	(15	)	$	10,632	$	(1,793	)	$	24,316	$	(1,808	)

The gross unrealized losses as of January 3, 2015 and December 28, 2013 were due primarily to the illiquidity of the Company's auction-rate securities and, to a lesser extent, to changes in market interest rates.

The following summarizes the contractual underlying maturities of the Company's available-for-sale investments at January 3, 2015 (in thousands):

	Cost		Fair Value
Due in one year or less	$	208,047	$	208,166
Due after one year through ten years		62,464		62,470
Due after ten years		20,415		19,834

	$	290,926	$	290,470

Derivative Financial Instruments

12 Months Ended

Jan. 03, 2015

Derivative Financial Instruments

Derivative Financial Instruments

5. Derivative Financial Instruments

The Company uses derivative financial instruments to manage certain exposures to the variability of interest rates and foreign currency exchange rates. The Company's objective is to offset increases and decreases in expenses resulting from these exposures with gains and losses on the derivative contracts, thereby reducing volatility of earnings.

Interest Rate Swaps

The Company is exposed to interest rate fluctuations in the normal course of its business, including through its Credit Facilities. The interest payments on the facility are calculated using a variable-rate of interest. The Company has entered into an interest rate swap agreement with an original notional value of $100 million (equal to the full amount borrowed under the Term Loan Facility) and, effectively, converted the LIBOR portion of the variable-rate interest payments to fixed-rate interest payments through July 2017 (the maturity date of the Term Loan Facility). The Company's interest rate swap agreement is designated and qualifies as a cash flow hedge.

The Company's previous swap agreement with a notional value of $50.1 million was terminated in fiscal 2012 in connection with the Company's purchase of its corporate headquarters facilities. See Note 9, Acquisitions, for additional information.

The Company estimates the fair values of interest rate swaps based on quoted prices and market observable data of similar instruments. If the Term Loan Facility or the interest rate swap agreement is terminated prior to maturity, the fair value of the interest rate swap recorded in accumulated other comprehensive loss may be recognized in the Consolidated Statement of Income based on an assessment of the agreements at the time of termination. The termination of the Company's swap agreement with a notional value of $50.1 million resulted in its remaining fair value of $0.9 million that was previously recorded in accumulated other comprehensive loss to be reclassified into earnings during fiscal 2012. The Company did not discontinue any other cash flow hedges in the periods presented.

The Company measures the effectiveness of its cash flow hedge by comparing the change in fair value of the hedged variable interest payments with the change in fair value of the interest rate swap. The Company recognizes ineffective portions of the hedge, as well as amounts not included in the assessment of effectiveness, in the Consolidated Statement of Income. As of January 3, 2015, no portion of the gains or losses from the Company's hedging instrument was excluded from the assessment of effectiveness. Hedge ineffectiveness was not material for any of the periods presented.

The Company's derivative financial instrument in cash flow hedging relationships consisted of the following (in thousands):

		Fair Value
	Balance Sheet Location	January 3, 2015		December 28, 2013
Interest rate swap	Other assets, net	$	331	$	513

The before-tax effect of derivative instruments in cash flow hedging relationships was as follows (in thousands):

	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during the Year Ended								Location of Loss Reclassified into Income	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Year Ended
	January 3, 2015			December 28, 2013		December 29, 2012				January 3, 2015			December 28, 2013			December 29, 2012
Interest rate swaps	$	(799	)	$	611	$	(956	)	Rent expense	$	—		$	—		$	(2,197	)
									Interest expense		(618	)		(560	)		(98	)

The Company expects to reclassify $0.4 million of its interest rate swap losses included in accumulated other comprehensive loss as of January 3, 2015 into earnings in the next 12 months, which would be offset by lower interest payments.

Foreign Currency Forward Contracts

The Company uses foreign currency forward contracts to manage exposure to foreign exchange risk. As of January 3, 2015, the Company held one foreign currency forward contract denominated in Norwegian Krone with a notional value of $7.7 million. The fair value of the contract was not material as of January 3, 2015. The contract has a maturity date of April 1, 2015 and it was not designated as a hedging instrument. The Company held no foreign currency forward contracts prior to fiscal 2014.

The before-tax effect of derivative instruments not designated as hedging instruments was as follows (in thousands):

Gain Recognized in Income		Year Ended January 3, 2015			Location
Foreign currency forward contracts		$	1,075		Other income (expense), net

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
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-Paragraph 1A
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Fair Value of Financial Instruments

12 Months Ended

Jan. 03, 2015

Fair Value of Financial Instruments

Fair Value of Financial Instruments

6. Fair Value of Financial Instruments

The following summarizes the valuation of the Company's financial instruments (in thousands). The tables do not include either cash on hand or assets and liabilities that are measured at historical cost or any basis other than fair value.

	Fair Value Measurements at January 3, 2015 Using
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash Equivalents:
Money market funds	$	71,415	$	—	$	—	$	71,415
Certificates of deposit		—		7,739		—		7,739
Commercial paper		—		5,348		—		5,348
Municipal bonds		—		1,757		—		1,757
U.S. government agency		—		1,202		—		1,202
Corporate bonds		—		1,101		—		1,101
U.S. government bonds		1,000		—		—		1,000

Total cash equivalents	$	72,415	$	17,147	$	—	$	89,562
Short-term Investments:
Municipal bonds	$	—	$	129,152	$	—	$	129,152
Corporate bonds		—		33,033		—		33,033
Variable-rate demand notes		—		12,915		—		12,915
Commercial paper		—		8,995		—		8,995
Asset-backed securities		—		5,377		—		5,377
International government bonds		—		2,516		—		2,516
U.S. government bond		650		—		—		650
U.S. government agency		—		601		—		601
Certificates of deposit		—		250		—		250

Total short-term investments	$	650	$	192,839	$	—	$	193,489
Long-term Investments:
Auction rate securities	$	—	$	—	$	7,419	$	7,419

Total long-term investments	$	—	$	—	$	7,419	$	7,419
Other assets, net:
Derivative instruments	$	—	$	331	$	—	$	331

Total	$	—	$	331	$	—	$	331

Total	$	73,065	$	210,317	$	7,419	$	290,801


Liabilities:
Accrued expenses:
Contingent consideration	$	—	$	—	$	4,288	$	4,288
Other non-current liabilities:
Contingent consideration	$	—	$	—	$	14,150	$	14,150

Total	$	—	$	—	$	18,438	$	18,438

	Fair Value Measurements at December 28, 2013 Using
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash Equivalents:
Money market funds	$	39,538	$	—	$	—	$	39,538
Certificates of deposit		—		7,768		—		7,768
Commercial paper		—		2,499		—		2,499
Municipal bonds		—		451		—		451

Total cash equivalents	$	39,538	$	10,718	$	—	$	50,256
Short-term Investments:
Municipal bonds	$	—	$	119,460	$	—	$	119,460
Variable-rate demand notes		—		38,025		—		38,025
Corporate bonds		—		17,844		—		17,844
Commercial paper		—		3,748		—		3,748
Asset-backed securities		—		516		—		516

Total short-term investments	$	—	$	179,593	$	—	$	179,593
Long-term Investments:
Auction rate securities	$	—	$	—	$	10,632	$	10,632

Total long-term investments	$	—	$	—	$	10,632	$	10,632
Other assets, net:
Derivative instruments	$	—	$	513	$	—	$	513

Total	$	—	$	513	$	—	$	513

Total	$	39,538	$	190,824	$	10,632	$	240,994


Liabilities:
Other non-current liabilities:
Contingent consideration	$	—	$	—	$	12,919	$	12,919

Total	$	—	$	—	$	12,919	$	12,919

The Company's cash equivalents and short-term investments that are classified as Level 1 are valued using quoted prices and other relevant information generated by market transactions involving identical assets. Cash equivalents and short-term investments classified as Level 2 are valued using non-binding market consensus prices that are corroborated with observable market data; quoted market prices for similar instruments in active markets; or pricing models, such as a discounted cash flow model, with all significant inputs derived from or corroborated with observable market data. Investments classified as Level 3 are valued using a discounted cash flow model. The assumptions used in preparing the discounted cash flow model include estimates for interest rates, amount of cash flows, expected holding periods of the securities and a discount to reflect the Company's inability to liquidate the securities. The Company's derivative instruments are valued using discounted cash flow models. The assumptions used in preparing the valuation models include quoted interest swap rates, foreign exchange rates, forward and spot prices for currencies, and market observable data of similar instruments.

The Company's contingent consideration is valued using a Monte Carlo simulation model or a probability weighted discounted cash flow model. The assumptions used in preparing the Monte Carlo simulation model include estimates for revenue growth rates, revenue volatility, contractual terms and discount rates. The assumptions used in preparing the discounted cash flow model include estimates for outcomes if milestone goals are achieved, the probability of achieving each outcome and discount rates.

The following summarizes quantitative information about Level 3 fair value measurements.

Auction rate securities

Fair Value at January 3, 2015 (000s)	Valuation Technique	Unobservable Input	Weighted Average
$7,419	Discounted cash flow	Estimated yield	1.04%
		Expected holding period	10 years
		Estimated discount rate	3.23%

The Company has followed an established internal control procedure used in valuing auction rate securities. The procedure involves the analysis of valuation techniques and evaluation of unobservable inputs commonly used by market participants to price similar instruments, and which have been demonstrated to provide reasonable estimates of prices obtained in actual market transactions. Outputs from the valuation process are assessed against various market sources when they are available, including marketplace quotes, recent trades of similar illiquid securities, benchmark indices and independent pricing services. The technique and unobservable input parameters may be recalibrated periodically to achieve an appropriate estimation of the fair value of the securities.

Significant changes in any of the unobservable inputs used in the fair value measurement of auction rate securities in isolation could result in a significantly lower or higher fair value measurement. An increase in expected yield would result in a higher fair value measurement, whereas an increase in expected holding period or estimated discount rate would result in a lower fair value measurement. Generally, a change in the assumptions used for expected holding period is accompanied by a directionally similar change in the assumptions used for estimated yield and discount rate.

Contingent consideration

Fair Value at January 3, 2015 (000s)	Valuation Technique	Unobservable Input	Range
$18,438	Monte Carlo simulation	Expected revenue growth rate	35.6% - 69.1%
		Expected revenue volatility	20.0%
		Expected term	0.0 years - 4.0 years
		Estimated discount rate	0.1% - 1.7%

The Company has followed an established internal control procedure used in valuing contingent consideration. The valuation of contingent consideration for the Energy Micro acquisition is based on the Company's revenue data for fiscal 2014 and a Monte Carlo simulation model for fiscal 2015 to 2018. The fair value of this valuation is estimated on a quarterly basis through a collaborative effort by the Company's sales, marketing and finance departments.

Significant changes in any of the unobservable inputs used in the fair value measurement of contingent consideration in isolation could result in a significantly lower or higher fair value. A change in projected revenue growth rates would be accompanied by a directionally similar change in fair value.

The following summarizes the activity in Level 3 financial instruments for the years ended January 3, 2015 and December 28, 2013 (in thousands):

Assets

	Year Ended
Auction Rate Securities	January 3, 2015			December 28, 2013
Beginning balance	$	10,632		$	11,369
Settlements		(4,425	)		(100	)
Gain (loss) included in other comprehensive income		1,212			(637	)

Ending balance	$	7,419		$	10,632

Liabilities

	Year Ended
Contingent Consideration (1)	January 3, 2015			December 28, 2013
Beginning balance	$	12,919		$	2,750
Issues		—			13,964
(Gain) loss recognized in earnings (2)		5,519			(3,795	)

Ending balance	$	18,438		$	12,919


Net gain (loss) for the period included in earnings attributable to contingent consideration held at the end of the period:	$	(5,519	)	$	1,045

(1)	In connection with the acquisition of Energy Micro and Ember, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation model are recorded in selling, general and administrative expenses in the Consolidated Statement of Income.
(2)	Changes to the estimated fair value of contingent consideration were primarily due to revisions to the Company's expectations of earn-out achievement.

Fair values of other financial instruments

The Company's Term Loan Facility bears interest at LIBOR plus an applicable margin. The Term Loan Facility is recorded at cost, but is measured at fair value for disclosure purposes. Fair value is estimated based on Level 2 inputs, using a discounted cash flow analysis of future principal payments and projected interest based on current market rates. As of January 3, 2015 and December 28, 2013, the fair value of the Company's debt was approximately $87.4 million and $94.8 million, respectively.

The Company's other financial instruments, including cash, accounts receivable and accounts payable, are recorded at amounts that approximate their fair values due to their short maturities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Balance Sheet Details

12 Months Ended

Jan. 03, 2015

Balance Sheet Details

Balance Sheet Details

7. Balance Sheet Details

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Inventories

	January 3, 2015		December 28, 2013
Work in progress	$	40,640	$	34,503
Finished goods		11,991		10,768

	$	52,631	$	45,271

Prepaid Expenses and Other Current Assets

	January 3, 2015		December 28, 2013
Distributor advances	$	32,932	$	31,839
Other		16,239		15,812

	$	49,171	$	47,651

Property and Equipment

	January 3, 2015			December 28, 2013
Buildings and improvements	$	94,453		$	94,221
Equipment		51,654			51,071
Computers and purchased software		27,282			25,556
Leasehold interest in ground leases		23,840			23,840
Furniture and fixtures		4,008			3,496
Leasehold improvements		8,901			7,784

		210,138			205,968
Accumulated depreciation		(77,318	)		(73,523	)

	$	132,820		$	132,445

Accrued Expenses

	January 3, 2015		December 28, 2013
Accrued compensation and benefits	$	28,443	$	24,896
Acquisition-related holdback		20,010		—
Other		25,193		21,079

	$	73,646	$	45,975

Other Non-current Liabilities

	January 3, 2015		December 28, 2013
Contingent consideration	$	14,150	$	12,919
Acquisition-related holdback		—		20,010
Other		29,541		23,012

	$	43,691	$	55,941

Risks and Uncertainties

12 Months Ended

Jan. 03, 2015

Risks and Uncertainties

Risks and Uncertainties

8. Risks and Uncertainties

Financial Instruments

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents, investments, accounts receivable and derivatives. The Company places its cash equivalents and investments primarily in municipal bonds, money market funds, corporate bonds, commercial paper, variable-rate demand notes, certificates of deposit, auction-rate securities, asset-backed securities, international government bonds, U.S. government agency and U.S. government bonds. Concentrations of credit risk with respect to accounts receivable are primarily due to customers with large outstanding balances. The Company's customers that accounted for greater than 10% of accounts receivable consisted of the following:

	January 3, 2015			December 28, 2013
Edom Technology		25	%		26	%
Arrow Electronics		11	%		10	%
Avnet		11	%		**

**	Less than 10% of accounts receivable

The Company performs periodic credit evaluations of its customers' financial condition and generally requires no collateral from its customers. The Company provides an allowance for potential credit losses based upon the expected collectibility of such receivables. Losses have not been significant for any of the periods presented.

As a result of its use of derivative instruments, the Company is exposed to the risk that its counterparties will fail to meet their contractual obligations. To mitigate this counterparty credit risk, the Company has a policy to enter into contracts with only selected major financial institutions. The Company periodically reviews and re-assesses the creditworthiness of such counterparties based on a variety of factors.

Distributor Advances

On sales to distributors, the Company's payment terms often require the distributor to initially pay amounts owed to the Company for an amount in excess of their ultimate cost. The Company's sales price to its distributors may be higher than the amount that the distributors will ultimately owe the Company because distributors often negotiate price reductions after purchasing the product from the Company and such reductions are often significant. These negotiated price discounts are not granted until the distributor sells the product to the end customer, which may occur after the distributor has paid the original invoice amount to the Company. Payment of invoices prior to receiving an associated discount can have an adverse impact on the working capital of the Company's distributors. Accordingly, the Company has entered into agreements with certain distributors whereby it advances cash to the distributors to reduce the distributor's working capital requirements. The advance amounts are based on the distributor's inventory balance, and are adjusted quarterly. Such amounts are recorded in prepaid expenses and other current assets in the Consolidated Balance Sheet. The terms of these advances are set forth in binding legal agreements and are unsecured, bear no interest on unsettled balances and are due upon demand. The agreements governing these advances can be cancelled by the Company at any time.

Suppliers

A significant portion of the Company's products are fabricated by Taiwan Semiconductor Manufacturing Co. (TSMC) or TSMC's affiliates and Semiconductor Manufacturing International Corporation (SMIC). The inability of TSMC or SMIC to deliver wafers to the Company on a timely basis could impact the production of the Company's products for a substantial period of time, which could have a material adverse effect on the Company's business, financial condition and results of operations.

Customers

The Company sells directly to end customers, distributors and contract manufacturers. Although the Company actually sells the products to, and is paid by, distributors and contract manufacturers, the Company refers to the end customer as its customer. None of the Company's contract manufacturers accounted for greater than 10% of revenue during fiscal 2014, 2013 or 2012. The Company's end customers and distributors that accounted for greater than 10% of revenue consisted of the following:

	Year Ended
	January 3, 2015			December 28, 2013			December 29, 2012
End Customers
Samsung*		12	%		15	%		19	%
Distributors
Edom Technology		20	%		21	%		22	%
Avnet		12	%		11	%		11	%

*	Samsung's purchases were across a variety of product areas.

Acquisitions

12 Months Ended

Jan. 03, 2015

Acquisitions

Acquisitions

9. Acquisitions

Energy Micro

On July 1, 2013, the Company acquired Energy Micro AS, a late-stage private company. Energy Micro designed and developed energy-efficient 32-bit microcontrollers based on ARM Cortex-M architecture. Energy Micro's energy-friendly solutions are designed to enable a broad range of power-sensitive applications for the Internet of Things (IoT), including smart energy, home automation, security and portable electronics markets.

The Company acquired Energy Micro for approximately $140.6 million, including: 1) Initial consideration of $107.4 million; 2) Deferred consideration in the form of a promissory note with an estimated fair value of $19.2 million at the date of acquisition (the promissory note was subsequently exchanged for approximately 0.5 million shares of the Company's restricted stock after a mandatory two-month creditor notice.); and 3) Contingent consideration (the "Earn-Out") with an estimated fair value of $14.0 million at the date of acquisition. The Earn-Out is payable up to approximately $33.3 million based on the extent to which the annual revenue growth rate from certain Energy Micro and Silicon Laboratories products (the "Earn-Out Products") exceeds 25% per year, over a five-year period from fiscal 2014 through 2018 (the "Earn-Out Period"). The Earn-Out is payable on an annual basis and in no event shall exceed $6,666,666 per year, unless revenue from the Earn-Out Products exceeds $400 million in a single fiscal year during the Earn-Out Period (in which case, the entire Earn-Out amount less any amounts previously paid will become payable). Approximately $20.3 million of the initial consideration was withheld by the Company as security for breaches of representations and warranties and certain other expressly enumerated matters. The holdback obligation was recorded in other non-current liabilities in the Consolidated Balance Sheet.

A portion of the Earn-Out (28.76%) is contingent on the continued employment of certain key employees for the three years following the acquisition date (the "Departure Percentage"). The Departure Percentage was accounted for as a transaction separate from the business combination based on its economic substance and will be recorded as post-combination compensation expense in the Company's financial statements during the Earn-Out period.

The Company believes that this strategic acquisition will accelerate its deployment of energy-friendly solutions across the IoT industries, while further scaling the Company's engineering team. These factors contributed to a purchase price that was in excess of the fair value of the net assets acquired and, as a result, the Company recorded goodwill. The goodwill is not deductible for tax purposes. The purchase price was allocated as follows (in thousands):

	Amount			Weighted-Average Amortization Period (Years)
Intangible assets:
In-process research and development	$	18,600		Not amortized
Core and developed technology		29,100		7
Customer relationships		6,400		8
Trademarks		1,300		8

		55,400
Cash and cash equivalents		919
Other current assets		6,486
Goodwill		98,515
Other non-current assets		3,117
Current liabilities		(8,000	)
Non-current deferred tax liabilities, net		(6,288	)
Long-term debt		(8,434	)
Other non-current liabilities		(1,133	)

Total purchase price	$	140,582

In-process research and development (IPR&D) represents acquired technology that had not achieved technological feasibility as of the acquisition date and had no alternative future use. The IPR&D recorded in connection with the acquisition of Energy Micro consisted of a multi-protocol wireless RF solution. The fair value of this technology was determined using the income approach. The discount rate applicable to the cash flows was 13.0%.

Pro forma information related to this acquisition has not been presented because it would not be materially different from amounts reported. The Company recorded approximately $2.4 million of acquisition-related costs in selling, general and administrative expenses during fiscal 2013.

Ember

On July 3, 2012, the Company acquired Ember Corporation, a privately held company. Ember's products integrate high-performance, low-power 2.4 GHz wireless ICs with reliable and scalable software into a flexible and robust networking platform. The Company acquired Ember for approximately $79.0 million, including contingent consideration with an estimated fair value of $4.0 million at the date of acquisition.

The Company believes that this strategic acquisition provides it with the technology and software expertise required to enable the low-power mesh sensor networks being deployed today in a wide range of residential, commercial and industrial applications. These factors contributed to a purchase price that was in excess of the fair value of the net assets acquired and, as a result, the Company recorded goodwill. The goodwill is not deductible for tax purposes. The purchase price was allocated as follows (in thousands):

	Amount			Weighted-Average Amortization Period (Years)
Intangible assets:
In-process research and development	$	14,810		Not amortized
Developed technology		17,800		11
Customer relationships		5,620		9
Trademarks		910		12

		39,140
Cash and cash equivalents		3,115
Accounts receivable		1,928
Inventories		4,749
Other current assets		324
Goodwill		14,777
Non-current deferred tax assets, net		16,449
Other non-current assets		1,776
Current liabilities		(3,287	)

Total purchase price	$	78,971

The IPR&D recorded in connection with the acquisition of Ember consisted of a low-power RF transceiver. The fair value of this technology was determined using the income approach. The discount rate applicable to the cash flows was 12.5%.

Pro forma information related to this acquisition has not been presented because it would not be materially different from amounts reported. Acquisition-related costs were not significant.

Corporate Headquarters Buildings

The Company leased facilities at 400 W. Cesar Chavez ("400 WCC") and 200 W. Cesar Chavez ("200 WCC") in Austin, Texas for its corporate headquarters. During the terms of the leases, the Company had options to purchase the buildings for approximately $44.3 million for 400 WCC and $50.1 million for 200 WCC. In September 2012, the Company exercised such options and purchased the facilities.

The buildings are located on land which is leased through 2099 from a third party. The rents for these ground leases were prepaid for the term of the leases by the previous lessee. The first floor of each building was leased to the same third party for the term of the ground leases. The base rents for the first floor leases were prepaid to the previous owner of the buildings. Portions of the remaining floors were also leased to other tenants.

The Company determined that the purchase of the facilities represented a business combination. Under the acquisition method of accounting, the assets acquired and liabilities assumed were recorded at their fair values as of the date of the acquisition. The purchase price was allocated as follows (in thousands):

	Amount
Buildings	$	90,900
Leasehold interest in ground leases		23,840
Acquired unfavorable leases		(11,925	)
Lease-related charges		(8	)
Net gain on purchase		(8,457	)

Total purchase price	$	94,350

The buildings and leasehold interest in ground leases will be depreciated on a straight-line basis over their estimated useful lives of 40 years and 86 years, respectively. Acquired unfavorable leases represent the difference between contractual minimum rental payments due under previously-existing leases in each building and the market rates of those same leases. This amount was recorded in other non-current liabilities in the Consolidated Balance Sheet and will be amortized to rental income over the estimated terms of the leases.

The purchase of the facilities resulted in a net gain of approximately $8.5 million, which was recorded in selling, general and administrative expenses in the Consolidated Statement of Income in fiscal 2012. The gain resulted primarily because the assets acquired and liabilities assumed were recorded at their fair values as of the date of the acquisition, which was substantially higher than the purchase prices of the facilities. The purchase prices were fixed at the beginning of the two leases in March 2006 and March 2008. While market prices for such facilities increased over the terms of the leases, the purchase prices remained the same.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Goodwill and Other Intangible Assets

12 Months Ended

Jan. 03, 2015

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

10. Goodwill and Other Intangible Assets

Goodwill

The following summarizes the activity in goodwill for the years ended January 3, 2015 and December 28, 2013 (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013
Beginning balance	$	228,781	$	130,265
Additions due to business combinations		—		98,516

Ending balance	$	228,781	$	228,781

Other Intangible Assets

The gross carrying amount and accumulated amortization of other intangible assets are as follows (in thousands):

		January 3, 2015					December 28, 2013
	Weighted-Average Amortization Period (Years)	January 3, 2015					December 28, 2013
	Weighted-Average Amortization Period (Years)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
Intangible assets:
Subject to amortization:
Core and developed technology	9	$	148,891	$	(47,894	)	$	138,340	$	(41,782	)
Customer relationships	9		14,500		(4,003	)		14,500		(2,330	)
Patents	6		3,000		(1,250	)		3,000		(750	)
Trademarks	10		2,210		(433	)		2,210		(195	)

	9		168,601		(53,580	)		158,050		(45,057	)
Not subject to amortization:
In-process research and development	Not amortized		—		—			18,600		—

Total intangible assets		$	168,601	$	(53,580	)	$	176,650	$	(45,057	)

Gross intangible assets decreased in fiscal 2014 primarily due to the removal of $9.4 million of fully amortized assets.

Amortization expense related to intangible assets for fiscal 2014, 2013 and 2012 was $17.9 million, $14.6 million and $10.7 million, respectively. The estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years is as follows (in thousands):

Fiscal Year
2015	$	19,331
2016		18,682
2017		17,715
2018		16,690
2019		14,251

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Debt

12 Months Ended

Jan. 03, 2015

Debt

Debt

11. Debt

On July 31, 2012, the Company and certain of its domestic subsidiaries (the "Guarantors") entered into a $230 million five-year Credit Agreement (the "Agreement"). The Agreement consists of a $100 million Term Loan Facility and a $130 million Revolving Credit Facility (collectively, the "Credit Facilities").

The Term Loan Facility provides for quarterly principal amortization (equal to 5% of the principal in each of the first two years and 10% of the principal in each of the next three years) with the remaining balance payable upon the maturity date. The Revolving Credit Facility includes a $25 million letter of credit sublimit and a $10 million swingline loan sublimit. The Company has an option to increase the size of the Revolving Credit Facility by up to an aggregate of $50 million in additional commitments, subject to certain conditions. On September 27, 2012, the Company borrowed $100 million under the Term Loan Facility. To date, the Company has not borrowed under the Revolving Credit Facility.

The Term Loan Facility and Revolving Credit Facility, other than swingline loans, will bear interest at LIBOR plus an applicable margin or, at the option of the Company, a base rate (defined as the highest of the Bank of America prime rate, the Federal Funds rate plus 0.50% and a daily rate equal to one-month LIBOR plus 1.00%) plus an applicable margin. Swingline loans accrue interest at the base rate plus the applicable margin for base rate loans. The applicable margins for the LIBOR rate loans range from 1.50% to 2.50% and for base rate loans range from 0.50% to 1.50%, depending in each case, on the leverage ratio as defined in the Agreement. The Company also pays a commitment fee on the unused amount of the Revolving Credit Facility.

In connection with the closing of the Credit Agreement, the Company entered into a security and pledge agreement. Under the security and pledge agreement, the Company pledged equity securities of certain of its subsidiaries, subject to exceptions and limitations. The Credit Facilities contain various conditions, covenants and representations with which the Company must be in compliance in order to borrow funds and to avoid an event of default, including financial covenants that the Company must maintain a leverage ratio (funded debt/EBITDA) of no more than 2.5 to 1 and a minimum fixed charge coverage ratio (EBITDA/debt payments, income taxes and capital expenditures) of no less than 1.50 to 1. As of January 3, 2015, the Company was in compliance with all covenants of the Credit Facilities.

As of January 3, 2015, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):

Fiscal Year
2015	$	10,000
2016		10,000
2017		67,500

Total	$	87,500

Interest Rate Swap Agreement

In connection with the $100 million borrowed under the Term Loan Facility, the Company entered into an interest rate swap agreement as a hedge against the LIBOR portion of such variable interest payments. Under the terms of the swap agreement, the Company effectively converted the LIBOR portion of the interest on the Term Loan Facility to a fixed interest rate of 0.764% through the maturity date. As of January 3, 2015, the combined interest rate on the Term Loan Facility (which includes an applicable margin) was 2.514%. See Note 5, Derivative Financial Instruments, for additional information.

Stockholders' Equity

12 Months Ended

Jan. 03, 2015

Stockholders' Equity

Stockholders' Equity

12. Stockholders' Equity

Common Stock

The Company issued 1.1 million shares of common stock during fiscal 2014.

Share Repurchase Programs

The Board of Directors authorized the following share repurchase programs (in thousands):

Program Authorization Date	Program Termination Date	Program Amount
October 2014	December 2015	$	100,000
January 2014	January 2015	$	100,000
January 2013	January 2014	$	50,000
April 2012	January 2013	$	100,000
October 2011	April 2012	$	50,000

These programs allow for repurchases to be made in the open market or in private transactions, including structured or accelerated transactions, subject to applicable legal requirements and market conditions. The Company repurchased 1.7 million shares, 0.7 million shares and 1.7 million shares of its common stock for $71.7 million, $26.0 million and $62.0 million during fiscal 2014, 2013 and 2012, respectively. These shares were retired upon repurchase.

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss, net of taxes, were as follows (in thousands):

	Unrealized Gain (Loss) on Cash Flow Hedge			Net Unrealized Losses on Available- For-Sale Securities			Total
Balance at December 31, 2011	$	(1,299	)	$	(1,168	)	$	(2,467	)
Other comprehensive income (loss) before reclassifications		(621	)		650			29
Amount reclassified from accumulated other comprehensive loss		1,492			—			1,492

Net change for the period		871			650			1,521

Balance at December 29, 2012		(428	)		(518	)		(946	)
Other comprehensive income (loss) before reclassifications		397			(348	)		49
Amount reclassified from accumulated other comprehensive loss		364			(151	)		213

Net change for the period		761			(499	)		262

Balance at December 28, 2013		333			(1,017	)		(684	)
Other comprehensive income (loss) before reclassifications		(520	)		720			200
Amount reclassified from accumulated other comprehensive loss		402			—			402

Net change for the period		(118	)		720			602

Balance at January 3, 2015	$	215		$	(297	)	$	(82	)

Reclassifications From Accumulated Other Comprehensive Loss

	Year ended
Reclassification (in thousands)	January 3, 2015			December 28, 2013			December 29, 2012
Losses on cash flow hedges to:
Rent expense	$	—		$	—		$	(2,295	)
Interest expense		(618	)		(560	)		—
Gains on available-for-sales securities to:
Interest income		—			232			—

		(618	)		(328	)		(2,295	)
Income tax benefit		216			115			803

Total reclassifications	$	(402	)	$	(213	)	$	(1,492	)

Income Tax Allocated to the Components of Other Comprehensive Income

The income tax effects of the components of other comprehensive income were as follows (in thousands):

	Year ended
Income tax (expense) benefit on:	January 3, 2015			December 28, 2013			December 29, 2012
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	$	(387	)	$	187		$	(350	)
Reclassification for gains included in net income		—			81			—
Net changes to cash flow hedges:
Unrealized gains (losses) arising during the period		279			(214	)		335
Reclassification for losses included in net income		(216	)		(196	)		(803	)

Other comprehensive income	$	(324	)	$	(142	)	$	(818	)

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stock-Based Compensation

12 Months Ended

Jan. 03, 2015

Stock-Based Compensation

Stock-Based Compensation

13. Stock-Based Compensation

In fiscal 2009, the stockholders of the Company approved the 2009 Stock Incentive Plan (the "2009 Plan") and the 2009 Employee Stock Purchase Plan (the "2009 Purchase Plan"). On April 15, 2014, the stockholders of the Company approved amendments to both the 2009 Plan and the 2009 Purchase Plan. The amendments authorized additional shares of common stock for issuance, to comply with changes in applicable law, improve the Company's corporate governance and to implement other best practices. The amended plans are currently effective.

2009 Stock Incentive Plan

Under the 2009 Plan, the following may be granted: stock options, stock appreciation rights, performance shares, performance stock units, restricted stock units (RSUs), restricted stock awards (RSAs), performance-based awards and other awards (collectively, all such grants are referred to as "awards"). The amendment of the shares of common stock reserved for issuance in the 2009 Plan created two share pools—Prior Pool and New Pool. Awards of stock options and stock appreciation rights each deduct one share from the 2009 Plan shares available for issuance for each share granted, and full value awards (awards other than for which the participant is required to pay at least the fair market value of the underlying shares on the date of grant) deduct 1.55 shares from the 2009 Plan shares available for issuance for each share granted under the Prior Pool. Awards of stock options, stock appreciation rights, and full value awards each deduct one (1) share from the 2009 Plan shares available for issuance for each share granted under the New Pool. Awards granted under the 2009 Plan generally contain vesting provisions ranging from three to four years. The exercise price of stock options offered under the 2009 Plan may not be less than 100% of the fair market value of a share of our common stock on the date of grant. To the extent awards granted under the 2009 Plan terminate, expire or lapse for any reason, or are settled in cash, shares subject to such awards will again be available for grant.

2000 Stock Incentive Plan

In fiscal 2000, the Company's Board of Directors and stockholders approved the 2000 Plan. The 2000 Plan contains programs for (i) the discretionary granting of stock options to employees, non-employee board members and consultants for the purchase of shares of the Company's common stock, (ii) the discretionary issuance of common stock directly (as granted under direct issuance shares in RSAs and RSUs), (iii) the granting of special below-market stock options to executive officers and other highly compensated employees of the Company for which the exercise price can be paid using payroll deductions and (iv) the automatic issuance of stock options to non-employee board members. The discretionary issuance of common stock, RSUs and stock options generally contain vesting provisions ranging from three to eight years. If permitted by the Company, stock options can be exercised immediately and, similar to the direct issuance shares, are subject to repurchase rights which generally lapse in accordance with the vesting schedule. The repurchase rights provide that upon certain defined events, the Company can repurchase unvested shares at the price paid per share. The term of each stock option is no more than ten years from the date of grant.

Stock Grants and Modifications

The Company granted to its employees 0.8 million, 1.1 million and 0.8 million shares of full value awards and no stock options from the 2009 Plan during fiscal 2014, 2013 and 2012, respectively.

The Company recorded $1.9 million in selling, general and administrative expense during fiscal 2012 in connection with modifications to certain stock awards. The Company accelerated the vesting of certain RSUs and Market Stock Units (MSUs) and extended the exercise period of stock options pursuant to a separation agreement between the Company and its former Chief Executive Officer (CEO). There were no other significant modifications made to any stock grants during fiscal 2014, 2013 or 2012.

Included in the full value awards granted under the 2009 Plan in fiscal 2014, 2013 and 2012 were a total of 76 thousand, 132 thousand and 110 thousand market-based stock awards, respectively. The awards, also known as MSUs, provide the rights to acquire a number of shares of common stock for no cash consideration based upon achievement of specified levels of market conditions. The requisite service period for these MSUs is also the vesting period, which is generally three years. The performance criteria of the MSUs measure the difference between the total stockholders' return of the Company against that of the Philadelphia Semiconductor Sector Total Return Index.

2009 Employee Stock Purchase Plan

The rights to purchase common stock granted under the 2009 Purchase Plan are intended to be treated as either (i) purchase rights granted under an "employee stock purchase plan," as that term is defined in Section 423(b) of the Internal Revenue Code (the "423(b) Plan"), or (ii) purchase rights granted under an employee stock purchase plan that is not subject to the terms and conditions of Section 423(b) of the Internal Revenue Code (the "Non-423(b) Plan"). The Company will retain the discretion to grant purchase rights under either the 423(b) Plan or the Non-423(b) Plan. Eligible employees may purchase a limited number of shares of the Company's common stock at no less than 85% of the fair market value of a share of common stock at prescribed purchase intervals during an offering period. Each offering period will be comprised of a series of one or more successive and/or overlapping purchase intervals and has a maximum term of 24 months. During fiscal 2014, 2013 and 2012, the Company issued 204 thousand, 190 thousand and 181 thousand shares, respectively, under the 2009 Purchase Plan to its employees. The weighted-average fair value for purchase rights granted in fiscal 2014 under the 2009 Purchase Plan was $12.17 per share.

Accounting for Stock-Based Compensation

Stock-based compensation costs are based on the fair values on the date of grant for stock options and on the date of enrollment for the employee stock purchase plans, estimated by using the Black-Scholes option-pricing model. The fair values of stock awards and RSUs equal their intrinsic value on the date of grant. The fair values of MSUs generally are estimated using a Monte Carlo simulation based on the date of grant.

The Black-Scholes valuation calculation requires the Company to estimate key assumptions such as future stock price volatility, expected terms, risk-free rates and dividend yield. Expected stock price volatility is based upon a combination of both historical volatility and implied volatility derived from traded options on the Company's stock in the marketplace. Expected term is derived from an analysis of historical exercises and remaining contractual life of options. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant. The Company has never paid cash dividends and does not currently intend to pay cash dividends, thus it has assumed a 0% dividend yield.

The Monte Carlo simulation used to calculate the fair value of the MSUs simulates the present value of the potential outcomes of future stock prices of the Company and the Philadelphia Semiconductor Sector Total Return Index over the requisite service period. The projection of stock prices are based on the risk-free rate of return, the volatilities of the stock price of the Company and the Index, and the correlation of the stock price of the Company with the Index.

The Company must estimate potential forfeitures of stock grants and adjust compensation cost recorded accordingly. The estimate of forfeitures will be adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from such estimates. Changes in estimated forfeitures are recognized through a cumulative catch-up adjustment in the period of change and will also impact the amount of stock-based compensation expense to be recognized in future periods.

The fair values of stock options and RSUs are amortized as compensation expense on a straight-line basis over the vesting period of the grants. The fair values of RSAs are fully expensed in the period of grant, when shares are immediately issued with no vesting restrictions. The fair values of MSUs are amortized as compensation expense on a straight-line basis over the performance and service periods of the grants. Compensation expense recognized is shown in the operating activities section of the Consolidated Statements of Cash Flows.

The fair values estimated from the Black-Scholes option-pricing model were calculated using the following assumptions:

	Year Ended
2009 Employee Stock Purchase Plan	January 3, 2015			December 28, 2013			December 29, 2012
Expected volatility		28	%		27	%		38	%
Risk-free interest rate %		0.2	%		0.1	%		0.2	%
Expected term (in months)		15			7			15
Dividend yield		—			—			—

The fair values estimated from Monte Carlo simulation were calculated using the following assumptions:

	Year Ended
2009 Stock Incentive Plan	January 3, 2015			December 28, 2013			December 29, 2012
Expected volatility		33	%		32	%		32	%
Risk-free interest rate %		0.7	%		0.5	%		0.4	%
Expected term (in years)		2.8			2.9			2.9
Dividend yield		—			—			—

A summary of stock-based compensation activity with respect to fiscal 2014 follows:

Stock Options	Shares (000s)			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		1,089		$	35.09
Exercised		(444	)	$	35.67
Cancelled or expired		(116	)	$	49.19

Outstanding at January 3, 2015		529		$	31.50		1.61	$	8,661
Vested at January 3, 2015 and expected to vest		529		$	31.50		1.61	$	8,661
Exercisable at January 3, 2015		529		$	31.50		1.61	$	8,661

RSAs and RSUs	Shares (000s)			Weighted- Average Purchase Price		Weighted-Average Remaining Vesting Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		1,835		$	—
Granted		735		$	—
Issued		(680	)	$	—
Cancelled or expired		(109	)	$	—

Outstanding at January 3, 2015		1,781		$	—		1.02	$	84,584
Outstanding at January 3, 2015 and expected to vest		1,654		$	—		1.02	$	78,567

MSUs	Shares (000s)			Weighted- Average Purchase Price		Weighted-Average Remaining Vesting Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		246		$	—
Granted		76		$	—
Issued		—		$	—
Cancelled or expired		(24	)	$	—

Outstanding at January 3, 2015		298		$	—		1.18	$	14,181
Outstanding at January 3, 2015 and expected to vest		274		$	—		1.18	$	13,034

The following summarizes the Company's weighted average fair value at the date of grant:

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Per grant of RSAs and RSUs	$	47.93	$	43.01	$	42.25
Per grant of MSUs	$	60.08	$	31.94	$	53.25

The following summarizes the Company's stock-based payment and stock option values (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Intrinsic value of stock options exercised	$	5,674	$	4,198	$	9,064
Intrinsic value of RSAs and RSUs that vested	$	32,138	$	23,649	$	40,105
Grant date fair value of RSAs and RSUs that vested	$	29,668	$	24,026	$	31,215

The Company received cash of $13.3 million for the issuance of common stock, net of shares withheld for taxes, during fiscal 2014. The Company issues shares from the shares reserved under its stock plans upon the exercise of stock options, issuance of RSAs, vesting of RSUs and MSUs, and purchases through employee stock purchase plans. The Company does not currently expect to repurchase shares from any source to satisfy such obligation.

The following table presents details of stock-based compensation costs recognized in the Consolidated Statements of Income (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Cost of revenues	$	775	$	952	$	1,206
Research and development		18,521		14,530		12,602
Selling, general and administrative		19,771		15,318		17,368

		39,067		30,800		31,176
Income tax benefit		4,024		2,633		4,911

	$	35,043	$	28,167	$	26,265

The increase in stock-based compensation costs in fiscal 2014 was principally due to increased headcount. The Company had approximately $51.2 million of total unrecognized compensation costs related to granted stock awards as of January 3, 2015 that are expected to be recognized over a weighted-average period of approximately 1.9 years. There were no significant stock-based compensation costs capitalized into assets in any of the periods presented.

As of January 3, 2015, the Company had reserved shares of common stock for future issuance as follows (in thousands):

2000 Stock Incentive Plan			529
2009 Stock Incentive Plan			3,740
2009 Employee Stock Purchase Plan			882

Total shares reserved			5,151

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Jan. 03, 2015
Employee Benefit Plan
Employee Benefit Plan	14. Employee Benefit Plan The Company maintains a defined contribution or 401(k) Plan for its qualified U.S. employees. Participants may contribute a percentage of their compensation on a pre-tax basis, subject to a maximum annual contribution imposed by the Internal Revenue Code. The Company may make discretionary matching contributions as well as discretionary profit-sharing contributions to the 401(k) Plan. The Company contributed $3.2 million, $3.0 million and $2.9 million to the 401(k) Plan during fiscal 2014, 2013 and 2012, respectively.

Commitments and Contingencies

12 Months Ended

Jan. 03, 2015

Commitments and Contingencies

Commitments and Contingencies

15. Commitments and Contingencies

Operating Leases

The Company leases certain facilities under operating lease agreements that expire at various dates through 2025. Some of these arrangements contain renewal options and require the Company to pay taxes, insurance and maintenance costs.

Rent expense under operating leases was $4.2 million, $4.2 million and $4.4 million for fiscal 2014, 2013 and 2012, respectively. The minimum annual future rentals under the terms of these leases as of January 3, 2015 are as follows (in thousands):

Fiscal Year
2015	$	4,463
2016		4,137
2017		3,398
2018		2,517
2019		1,490
Thereafter		6,398

Total minimum lease payments	$	22,403

Litigation

Patent Litigation

On January 21, 2014, Cresta Technology Corporation ("Cresta Technology"), a Delaware corporation, filed a lawsuit against the Company, Samsung Electronics Co., Ltd., Samsung Electronics America, Inc., LG Electronics Inc. and LG Electronics U.S.A., Inc. in the United States District Court in the District of Delaware, alleging infringement of United States Patent Nos. 7,075,585, 7,265,792 and 7,251,466. The lawsuit relates to the Company's family of television tuner products. Cresta Technology seeks unspecified compensatory and enhanced damages, attorney fees and a permanent injunction. On January 28, 2014, Cresta Technology also filed a complaint with the United States International Trade Commission ("ITC") alleging infringement of the same patents against the Company, Samsung and LG Electronics and seeking to prevent the importation and sale of allegedly infringing products in the United States. The ITC instituted an investigation based on Cresta Technology's complaint on February 27, 2014. An evidentiary hearing in this ITC Investigation concluded on December 5, 2014. The ITC Administrative Law Judge is scheduled to issue an Initial Determination on February 27, 2015, and the Final Determination by the ITC is scheduled to issue on June 29, 2015. The Delaware District Court action has been stayed pending completion of the proceedings in the ITC. The Company intends to vigorously defend against these allegations.

On April 11, 2014, the Company filed a lawsuit against Cresta Technology in the United States District Court in the Western District of Texas, Austin Division, alleging infringement of United States Patent Nos. 6,308,055, 6,965,761 and 7,353,011. On July 14, 2014, the Court dismissed the lawsuit without prejudice due to the lack of commercial activity by Cresta Technology in the Western District of Texas. On July 16, 2014, the Company refiled its claims for the '055, '761 and '011 patents in a lawsuit in the United States District Court in the Northern District of California. In addition, the Company added additional claims alleging infringement of United States Patent Nos. 6,304,146, 6,137,372 and 6,233,441. The Company is seeking a permanent injunction stopping the sale of all allegedly infringing Cresta Technology products and an award of damages and attorney fees.

On May 6, 2014, the Company filed a complaint with the ITC alleging infringement of United States Patent Nos. 6,137,372 and 6,233,441 against Cresta Technology, Hauppauge Digital, Inc., Hauppague Computer Works, Inc., PCTV Systems, S.a.r.l., Luxembourg and PCTV Systems S.a.r.l., seeking to prevent the importation and sale of allegedly infringing products in the United States. On June 6, 2014, the ITC instituted an investigation based on the Company's complaint. On June 13, 2014, Cresta Technology proposed a consent order whereby Cresta Technology will not sell for importation, import or sell in the United States television tuners that infringe the patent claims asserted by the Company. On July 1, 2014, the Administrative Law Judge accepted the proposed consent order. Accordingly, this ITC investigation has been terminated in its entirety. Under the consent order, Cresta Technology is prohibited from selling for importation, importing or selling in the United States television tuners that infringe the Company's United States Patent Nos. 6,137,372 and 6,233,441.

As is customary in the semiconductor industry, the Company provides indemnification protection to its customers for intellectual property claims related to the Company's products. The Company has not accrued any material liability on its consolidated balance sheet related to such indemnification obligations in connection with the Cresta Technology litigation.

At this time, the Company cannot predict the outcome of these matters or the resulting financial impact to it, if any.

Other

The Company is involved in various other legal proceedings that have arisen in the normal course of business. While the ultimate results of these matters cannot be predicted with certainty, the Company does not expect them to have a material adverse effect on its consolidated financial statements.

Related Party Transactions	12 Months Ended
Related Party Transactions	Jan. 03, 2015
Related Party Transactions
Related Party Transactions	16. Related Party Transactions On July 1, 2013, Geir Førre joined the Company as senior vice president. Mr. Førre was chief executive officer of Energy Micro, until it was acquired by the Company. Mr. Førre was the beneficial owner of approximately 32% of the Energy Micro equity and accordingly (a) received approximately $35 million of the initial consideration of $107.4 million, (b) may receive an additional approximately $6.5 million out of the $20.3 million holdback related to potential indemnification claims and (c) may receive up to approximately $10.5 million of the $33.3 million earn-out. On October 17, 2013, the Company appointed Alf-Egil Bogen to its board of directors. Mr. Bogen was chief marketing officer of Energy Micro, until it was acquired by the Company. Mr. Bogen was the beneficial owner of approximately 2% of the Energy Micro equity and accordingly (a) received approximately $0.9 million of the initial consideration of $107.4 million, (b) may receive an additional approximately $0.4 million out of the $20.3 million holdback related to potential indemnification claims and (c) may receive up to approximately $0.7 million of the $33.3 million earn-out. Mr. Bogen had invested approximately $0.8 million in Energy Micro prior to the acquisition.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Income Taxes

12 Months Ended

Jan. 03, 2015

Income Taxes

Income Taxes

17. Income Taxes

Significant components of the provision for income taxes are as follows (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013			December 29, 2012
Current:
Domestic	$	7,083	$	4,796		$	21,084
International		882		4,093			(3,009	)

Total Current		7,965		8,889			18,075
Deferred:
Domestic		2,352		5,591			5,444
International		702		(2,272	)		(719	)

Total Deferred		3,054		3,319			4,725

	$	11,019	$	12,208		$	22,800

The Company's provision for income taxes differs from the expected tax expense amount computed by applying the statutory federal income tax rate to income before income taxes as a result of the following:

	Year Ended
	January 3, 2015			December 28, 2013			December 29, 2012
Federal statutory rate		35.0	%		35.0	%		35.0	%
Foreign tax rate benefit		(3.5	)		(8.2	)		(11.8	)
Research and development tax credits		(8.6	)		(12.8	)		(0.5	)
Release of prior year unrecognized tax benefits		(2.6	)		—			(8.4	)
Intercompany technology license		—			—			11.8
Excess officer compensation		2.3			1.9			1.0
Change in prior period valuation allowance		(1.4	)		3.1			—
Other		1.3			0.7			(0.7	)

		22.5	%		19.7	%		26.4	%

The effective tax rate for fiscal 2014 increased from fiscal 2013, primarily due to the recognition of the fiscal 2012 federal research and development tax credit in fiscal 2013 due to the enactment of the American Taxpayer Relief Act of 2012 on January 2, 2013, as well as a decrease in the foreign tax rate benefit in fiscal 2014. This increase in the effective tax rate was partially offset by the reduction to a valuation allowance recorded in a prior year related to certain state loss and research and development tax credit carryforwards and the release in fiscal 2014 of prior year unrecognized tax benefits due to the lapse of the statute of limitations applicable to a tax deduction claimed on a prior year foreign tax return.

The effective tax rate for fiscal 2013 decreased from fiscal 2012, primarily due to the fiscal 2012 tax charge related to the intercompany license of certain technology associated with the acquisition of Ember during fiscal 2012 and the recognition of the fiscal 2012 and fiscal 2013 federal research and development tax credits in fiscal 2013 as a result of the enactment of the American Taxpayer Relief Act of 2012 (the "Act") on January 2, 2013. The decrease in the effective tax rate for fiscal 2013 was partially offset by the release during fiscal 2012 of unrecognized tax benefits that were determined to be effectively settled during fiscal 2012.

Income before income taxes included the following components (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Domestic	$	38,174	$	41,849	$	80,494
Foreign		10,866		20,178		5,854

	$	49,040	$	62,027	$	86,348

Foreign income before taxes decreased from fiscal 2013 to fiscal 2014 primarily due to an increase in fiscal 2014 of the fair value of the Company's acquisition-related contingent consideration liability. Foreign income before income taxes increased from fiscal 2012 to fiscal 2013 primarily due to intercompany technology license payments made by a foreign subsidiary in 2012.

Deferred tax assets and liabilities are recorded for the estimated tax impact of temporary differences between the tax basis and book basis of assets and liabilities. A valuation allowance is established against a deferred tax asset when it is more likely than not that the deferred tax asset will not be realized. The Company recorded a new valuation allowance of $0.5 million in fiscal 2014 related to certain state research and development tax credit carryforwards generated in fiscal 2014. The Company has determined that it is more likely than not that a portion of these carryforwards will expire or go unutilized because the Company no longer expects to recognize sufficient income in the jurisdictions in which the attributes were created. The impact of this new valuation allowance was offset by a reduction of $0.6 million to a valuation allowance recorded in fiscal 2013 related to certain state loss and research and development tax credit carryforwards, resulting in a net valuation allowance reduction of $0.1 million reflected as a benefit to income tax expense in fiscal 2014. In addition, the Company recorded a reduction of $0.2 million to the fiscal 2013 valuation allowance related to the expiration of certain acquired state net operating loss carryforwards which were fully valued. Since this change was due to the expiration of the losses, the reduction to the valuation allowance was offset by a reduction in deferred tax assets rather than a charge to income tax expense. No valuation allowance was recorded against other deferred tax assets in fiscal 2014. Management believes that the Company's results of future operations will generate sufficient taxable income such that it is more likely than not that the remaining deferred tax assets will be realized.

Significant components of the Company's deferred taxes as of January 3, 2015 and December 28, 2013 are as follows (in thousands):

	January 3, 2015			December 28, 2013
Deferred tax assets:
Net operating loss carryforwards	$	31,518		$	38,399
Research and development tax credit carryforwards		9,740			9,276
Stock-based compensation		6,353			6,757
Capitalized research and development		7,371			8,999
Deferred income on shipments to distributors		8,117			5,733
Accrued liabilities and other		6,481			8,302

		69,580			77,466
Less: Valuation allowance		(3,455	)		(3,775	)

		66,125			73,691
Deferred tax liabilities:
Acquired intangible assets		33,630			38,444
Depreciation and amortization		3,388			2,022
Prepaid expenses and other		1,517			1,889

		38,535			42,355

Net deferred tax assets	$	27,590		$	31,336

As of January 3, 2015, the Company had federal net operating loss and research and development tax credit carryforwards of approximately $64.9 million and $2.0 million, respectively, as a result of the Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember acquisitions. These carryforwards expire in fiscal years 2020 through 2032. Recognition of these loss and credit carryforwards is subject to an annual limit, which may cause them to expire before they are used.

As of January 3, 2015, the Company had foreign net operating loss carryforwards of approximately $21.6 million as a result of the Energy Micro acquisition. These loss carryforwards do not expire and recognition is not subject to an annual limit.

The Company also had state loss and research and development tax credit carryforwards of approximately $57.9 million and $11.8 million, respectively. A portion of these loss and credit carryforwards was generated by the Company and a portion was acquired through the Integration Associates, Silicon Clocks, Spectra Linear and Ember acquisitions. Certain of these carryforwards expire in fiscal years 2015 through 2033 and others do not expire. Recognition of some of these loss and credit carryforwards is subject to an annual limit, which may cause them to expire before they are used.

At the end of fiscal 2014, undistributed earnings of the Company's foreign subsidiaries of approximately $303.1 million are intended to be permanently reinvested outside the U.S. Accordingly, no provision for U.S. federal and state income taxes associated with a distribution of these earnings has been made. Determination of the amount of the unrecognized deferred tax liability on these unremitted earnings is not practicable.

The Company's operations in Singapore are subject to reduced tax rates through 2019, as long as certain conditions are met. The income tax benefit (expense) from the reduced Singapore tax rate reflected in earnings was approximately $2.0 million (representing $0.05 per diluted share) in fiscal 2014, approximately $2.2 million (representing $0.05 per diluted share) in fiscal 2013, and approximately $(13.3) million (representing $(0.31) per diluted share) in fiscal 2012. The impact of the reduced Singapore tax rates in fiscal 2014 and fiscal 2012 reflect the recognition of prior year unrecognized tax benefits.

The following table reflects changes in the unrecognized tax benefits (in thousands):

	Year Ended
	January 3, 2015			December 28, 2013		December 29, 2012
Beginning balance	$	4,998		$	4,364	$	10,943
Additions based on tax positions related to current year		465			316		1,818
Additions based on tax positions related to prior years		58			318		—
Reductions for tax positions related to prior years		(1,592	)		—		(8,397	)

Ending balance	$	3,929		$	4,998	$	4,364

As of January 3, 2015, December 28, 2013 and December 29, 2012, the Company had gross unrecognized tax benefits of $3.9 million, $5.0 million, and $4.4 million, respectively, of which $4.0 million, $4.8 million, and $4.1 million, respectively, would affect the effective tax rate if recognized. During fiscal 2014, the Company had gross increases of $0.5 million to its current and prior year unrecognized tax benefits, as well as gross decreases of $1.3 million to its prior year unrecognized tax benefits related to an uncertain tax position that was closed by statute. In addition, there was a reduction of $0.3 million due to foreign currency remeasurement adjustments related to prior year unrecognized tax benefits which were recognized in other income (expense), net. During fiscal 2013, the Company had gross increases of $0.6 million. During fiscal 2012, the Company had gross increases of $1.8 million to its current year unrecognized tax benefits, as well as a gross decrease of $8.4 million to its prior year unrecognized tax benefits related to an uncertain tax position that was determined to be effectively settled. A portion of these amounts in fiscal 2012 represents foreign currency remeasurement adjustments and was recognized in other income (expense), net.

The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes. The Company recognized less than $0.1 million of interest in the provision for income taxes in both fiscal 2014 and fiscal 2013. The Company did not recognize interest in the provision for income taxes in fiscal 2012. The Company has an accrual of less than $0.1 million for the payment of interest related to unrecognized tax positions at the end of both fiscal 2014 and fiscal 2013, with no such accrual at the end of fiscal 2012.

The Company believes it is reasonably possible that the gross unrecognized tax benefits will decrease by approximately $0.6 million in the next 12 months due to the lapse of the statute of limitations applicable to a tax deduction claimed on a prior year foreign tax return.

The tax years 2010 through 2014 remain open to examination by the major taxing jurisdictions to which the Company is subject. The Company is not currently under audit in any major taxing jurisdiction.

Segment Information

12 Months Ended

Jan. 03, 2015

Segment Information

Segment Information

18. Segment Information

The Company has one operating segment, mixed-signal analog intensive ICs, consisting of numerous product areas. The Company's chief operating decision maker is considered to be its Chief Executive Officer. The chief operating decision maker allocates resources and assesses performance of the business and other activities at the operating segment level.

The Company groups its products into three categories, based on the markets and applications in which its ICs may be used. The following summarizes the Company's revenue by product category (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Broad-based	$	317,128	$	281,777	$	270,098
Broadcast		204,256		199,837		186,067
Access		99,320		98,473		107,129

Total	$	620,704	$	580,087	$	563,294

Revenue is attributed to a geographic area based on the shipped-to location. The following summarizes the Company's revenue by geographic area (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
United States	$	89,935	$	68,566	$	64,856
China		271,818		253,261		219,400
Taiwan		57,191		55,036		64,150
South Korea		12,824		21,303		57,910
Rest of world		188,936		181,921		156,978

Total	$	620,704	$	580,087	$	563,294

The following summarizes the Company's property and equipment, net by geographic area (in thousands):

	January 3, 2015		December 28, 2013
United States	$	127,928	$	126,263
Rest of world		4,892		6,182

Total	$	132,820	$	132,445

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

+ Details

Subsequent Event	12 Months Ended
Subsequent Event	Jan. 03, 2015
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Event Acquisition On January 30, 2015, the Company acquired Bluegiga Technologies Oy, a private company. Bluegiga is a provider of Bluetooth® Smart, Bluetooth Classic and Wi-Fi® modules and software stacks for a multitude of applications in the Internet of Things (IoT), industrial automation, consumer electronics, automotive, retail, residential, and health and fitness markets. The Company acquired Bluegiga for cash consideration of approximately $61 million. The Company will record the purchase of Bluegiga using the acquisition method of accounting and will recognize the assets acquired and liabilities assumed at their fair values as of the date of the acquisition. The results of Bluegiga's operations will be included in the Company's consolidated results of operations beginning on the date of the acquisition. The Company is currently evaluating the fair values of the consideration transferred, assets acquired and liabilities assumed. The Company expects to complete its initial purchase price allocation in the first quarter of fiscal 2015.

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Jan. 03, 2015

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SILICON LABORATORIES INC.
VALUATION AND QUALIFYING ACCOUNTS

			Additions
Valuation Allowance for Deferred Tax Assets	Balance at Beginning of Period		Charged to Expenses		Charged to Goodwill		Deductions			Balance at End of Period
					(in thousands)
Year ended January 3, 2015	$	3,775	$	—	$	—	$	(320	)	$	3,455
Year ended December 28, 2013	$	2,114	$	2,335	$	—	$	(674	)	$	3,775
Year ended December 29, 2012	$	—	$	—	$	2,114	$	—		$	2,114

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Jan. 03, 2015
Significant Accounting Policies
Foreign Currency Transactions	Foreign Currency Transactions The Company's foreign subsidiaries are considered to be extensions of the U.S. Company. The functional currency of the foreign subsidiaries is the U.S. dollar. Accordingly, gains and losses resulting from remeasuring transactions denominated in currencies other than U.S. dollars are included in other income (expense), net in the Consolidated Statements of Income.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Among the significant estimates affecting the financial statements are those related to inventories, stock-based compensation, investments in auction-rate securities, acquired intangible assets, goodwill, long-lived assets and income taxes. Actual results could differ from those estimates, and such differences could be material to the financial statements.
Reclassifications	Reclassifications Certain reclassifications have been made to prior year financial statements to conform to current year presentation.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair values of the Company's financial instruments are recorded using a hierarchal disclosure framework based upon the level of subjectivity of the inputs used in measuring assets and liabilities. The three levels are described below: Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2—Inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3—Inputs are unobservable for the asset or liability and are developed based on the best information available in the circumstances, which might include the Company's own data.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash deposits, money market funds and investments in debt securities with original maturities of ninety days or less when purchased.
Investments	Investments The Company's investments typically have original maturities greater than ninety days as of the date of purchase and are classified as either available-for-sale or trading securities. Investments in available-for-sale securities are reported at fair value, with unrealized gains and losses, net of tax, recorded as a component of accumulated other comprehensive loss in the Consolidated Balance Sheet. Investments in trading securities are reported at fair value, with both realized and unrealized gains and losses recorded in other income (expense), net in the Consolidated Statement of Income. Investments in which the Company has the ability and intent, if necessary, to liquidate in order to support its current operations (including those with contractual maturities greater than one year from the date of purchase) are classified as short-term. The Company reviews its available-for-sale investments as of the end of each reporting period for other-than-temporary declines in fair value based on the specific identification method. The Company considers various factors in determining whether an impairment is other-than-temporary, including the severity and duration of the impairment, changes in underlying credit ratings, forecasted recovery, its intent to sell or the likelihood that it would be required to sell the investment before its anticipated recovery in market value and the probability that the scheduled cash payments will continue to be made. When the Company concludes that an other-than-temporary impairment has occurred, the Company assesses whether it intends to sell the security or if it is more likely than not that it will be required to sell the security before recovery. If either of these two conditions is met, the Company recognizes a charge in earnings equal to the entire difference between the security's amortized cost basis and its fair value. If the Company does not intend to sell a security and it is not more likely than not that it will be required to sell the security before recovery, the unrealized loss is separated into an amount representing the credit loss, which is recognized in earnings, and the amount related to all other factors, which is recorded in accumulated other comprehensive loss.
Derivative Financial Instruments	Derivative Financial Instruments The Company uses derivative financial instruments to manage certain exposures to the variability of interest rates and foreign currency exchange rates. The Company's objective is to offset increases and decreases in expenses resulting from these exposures with gains and losses on the derivative contracts, thereby reducing volatility of earnings. The Company does not use derivative contracts for speculative or trading purposes. The Company recognizes derivatives, on a gross basis, in the Consolidated Balance Sheet at fair value. Cash flows from derivatives are classified according to the nature of the cash receipt or payment in the Consolidated Statement of Cash Flows. The Company uses interest rate swap agreements to manage exposure to interest rate risks. The swap agreements are designated and qualify as cash flow hedges. The effective portion of the gain or loss on the interest rate swaps is recorded in accumulated other comprehensive loss as a separate component of stockholders' equity and is subsequently recognized as interest expense in the Consolidated Statement of Income when the hedged exposure affects earnings. The Company uses foreign currency forward contracts to manage exposure to foreign exchange risk. These instruments are used to reduce the earnings impact that exchange rate fluctuations have on non-U.S. dollar balance sheet exposures. The Company recognizes gains and losses on the foreign currency forward contracts in other income (expense), net in the Consolidated Statement of Income in the same period as the remeasurement loss and gain of the related foreign currency denominated asset or liability. The Company does not apply hedge accounting to its foreign currency derivative instruments.
Inventories	Inventories Inventories are stated at the lower of cost, determined using the first-in, first-out method, or market. The Company writes down the carrying value of inventory to net realizable value for estimated obsolescence or unmarketable inventory based upon assumptions about the age of inventory, future demand and market conditions. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is computed using the straight-line method over the useful lives of the assets ranging from three to seven years. Leasehold improvements are depreciated over the contractual lease period or their useful life, whichever is shorter. In fiscal 2012, the Company purchased the facilities it had previously leased for its headquarters in Austin, Texas. The buildings are located on land which is leased through 2099 from a third party. The rents for these ground leases were prepaid for the term of the leases by the previous lessee. The buildings and leasehold interest in ground leases are being depreciated on a straight-line basis over their estimated useful lives of 40 years and 86 years, respectively.
Business Combinations	Business Combinations The Company records business combinations using the acquisition method of accounting and accordingly, allocates the fair value of purchase consideration to the assets acquired and liabilities assumed based on their fair values at the acquisition date. The excess of the fair value of purchase consideration over the fair value of the assets acquired and liabilities assumed is recorded as goodwill. The results of operations of the businesses acquired are included in the Company's consolidated results of operations beginning on the date of the acquisition.
Long-Lived Assets	Long-Lived Assets Purchased intangible assets are stated at cost, net of accumulated amortization, and are amortized using the straight-line method over their estimated useful lives, ranging from four to twelve years. Fair values are determined primarily using the income approach, in which the Company projects future expected cash flows and applies an appropriate discount rate. Long-lived assets "held and used" by the Company are reviewed for impairment whenever events or changes in circumstances indicate that their net book value may not be recoverable. When such factors and circumstances exist, the Company compares the projected undiscounted future cash flows associated with the related asset or group of assets over their estimated useful lives, against their respective carrying amounts. Impairment, if any, is based on the excess of the carrying amount over the fair value of those assets and is recorded in the period in which the determination was made. The carrying value of goodwill is reviewed at least annually by the Company for possible impairment. The goodwill impairment test is a two-step process. The first step of the impairment analysis compares the fair value of the reporting unit to the net book value of the reporting unit. In determining fair value, several valuation methodologies are allowed, although quoted market prices are the best evidence of fair value. If the results of the first step demonstrate that the net book value is greater than the fair value, the Company must proceed to step two of the analysis. Step two of the analysis compares the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized equal to that excess. The Company tests goodwill for impairment annually as of the first day of its fourth fiscal quarter and in interim periods if events occur that would indicate that the carrying value of goodwill may be impaired.
Revenue Recognition	Revenue Recognition Revenues are generated predominately by sales of the Company's ICs. The Company recognizes revenue when all of the following criteria are met: 1) there is persuasive evidence that an arrangement exists, 2) delivery of goods has occurred, 3) the sales price is fixed or determinable, and 4) collectibility is reasonably assured. Generally, revenue from product sales to direct customers and contract manufacturers is recognized upon shipment. A portion of the Company's sales are made to distributors under agreements allowing certain rights of return and price protection related to the final selling price to the end customers. Accordingly, the Company defers revenue and cost of revenue on such sales until the distributors sell the product to the end customers. The net balance of deferred revenue less deferred cost of revenue associated with inventory shipped to a distributor but not yet sold to an end customer is recorded in the deferred income on shipments to distributors liability on the Consolidated Balance Sheet. Such net deferred income balance reflects the Company's estimate of the impact of rights of return and price protection. A small portion of the Company's revenues is derived from the sale of patents. The above revenue recognition criteria for patent sales are generally met upon the execution of the patent sale agreement.
Shipping and Handling	Shipping and Handling Shipping and handling costs are classified as a component of cost of revenues in the Consolidated Statements of Income.
Stock-Based Compensation	Stock-Based Compensation The Company has stock-based compensation plans, which are more fully described in Note 13, Stock-Based Compensation. The Company accounts for those plans using a fair-value method and recognizes the expense in its Consolidated Statement of Income.
Research and Development	Research and Development Research and development costs are expensed as incurred. Research and development expense consists primarily of personnel-related expenses, including stock-based compensation, as well as new product masks, external consulting and services costs, equipment tooling, equipment depreciation, amortization of intangible assets, and an allocated portion of our occupancy costs. Assets purchased to support the Company's ongoing research and development activities are capitalized when related to products which have achieved technological feasibility or have an alternative future use, and are amortized over their estimated useful lives.
Advertising	Advertising Advertising costs are expensed as incurred. Advertising expenses were $1.7 million, $2.0 million and $1.7 million in fiscal 2014, 2013 and 2012, respectively.
Income Taxes	Income Taxes The Company accounts for income taxes using the asset and liability method whereby deferred tax asset and liability account balances are determined based on differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax laws and related rates that will be in effect when the differences are expected to reverse. These differences result in deferred tax assets and liabilities, which are included in the Company's Consolidated Balance Sheet. The Company then assesses the likelihood that the deferred tax assets will be realized. A valuation allowance is established against deferred tax assets to the extent the Company believes that it is more likely than not that the deferred tax assets will not be realized, taking into consideration the level of historical taxable income and projections for future taxable income over the periods in which the temporary differences are deductible. Uncertain tax positions must meet a more-likely-than-not threshold to be recognized in the financial statements and the tax benefits recognized are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon final settlement. See Note 17, Income Taxes, for additional information.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In June 2014, the Financial Accounting Standards Board (FASB) issued FASB Accounting Standards Update (ASU) No. 2014-12, Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period should be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Earlier adoption is permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements. In May 2014, the FASB issued FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step process to achieve that core principle. ASU 2014-09 requires disclosures enabling users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, using one of two retrospective application methods. Early application is not permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements. In April 2014, the FASB issued FASB ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update require a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results. ASU 2014-08 expands disclosure requirements about discontinued operations and adds new disclosures for individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for annual periods beginning on or after December 15, 2014, and interim periods within annual periods beginning on or after December 15, 2015. Early adoption is permitted, but only for disposals that have not been reported in financial statements previously issued. The adoption of this ASU is not expected to have a material impact on the Company's financial statements.

Earnings Per Share (Tables)

12 Months Ended

Jan. 03, 2015

Earnings Per Share

Schedule of computation of basic and diluted earnings per share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Net income	$	38,021	$	49,819	$	63,548

Shares used in computing basic earnings per share		42,970		42,715		42,136
Effect of dilutive securities:
Stock options and other stock-based awards		823		822		970

Shares used in computing diluted earnings per share		43,793		43,537		43,106


Earnings per share:
Basic	$	0.88	$	1.17	$	1.51
Diluted	$	0.87	$	1.14	$	1.47

Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Jan. 03, 2015

Cash, Cash Equivalents and Investments

Schedule of cash, cash equivalents, and investments

The Company's cash, cash equivalents and investments consisted of the following (in thousands):

	January 3, 2015
	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Fair Value
Cash and Cash Equivalents:
Cash on hand	$	52,144	$	—		$	—	$	52,144
Available-for-sale securities:
Money market funds		71,415		—			—		71,415
Certificates of deposit		7,739		—			—		7,739
Commercial paper		5,348		—			—		5,348
Municipal bonds		1,756		—			1		1,757
U.S. government agency		1,202		—			—		1,202
Corporate bonds		1,101		—			—		1,101
U.S. government bonds		1,000		—			—		1,000

Total available-for-sale securities		89,561		—			1		89,562

Total cash and cash equivalents	$	141,705	$	—		$	1	$	141,706


Short-term Investments:
Available-for-sale securities:
Municipal bonds	$	129,005	$	(25	)	$	172	$	129,152
Corporate bonds		33,043		(35	)		25		33,033
Variable-rate demand notes		12,915		—			—		12,915
Commercial paper		8,995		—			—		8,995
Asset-backed securities		5,380		(3	)		—		5,377
International government bonds		2,526		(10	)		—		2,516
U.S. government bonds		650		—			—		650
U.S. government agency		601		—			—		601
Certificates of deposit		250		—			—		250

Total short-term investments	$	193,365	$	(73	)	$	197	$	193,489


Long-term Investments:
Available-for-sale securities:
Auction rate securities	$	8,000	$	(581	)	$	—	$	7,419

Total long-term investments	$	8,000	$	(581	)	$	—	$	7,419

	December 28, 2013
	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Fair Value
Cash and Cash Equivalents:
Cash on hand	$	45,544	$	—		$	—	$	45,544
Available-for-sale securities:
Money market funds		39,538		—			—		39,538
Certificates of deposit		7,768		—			—		7,768
Commercial paper		2,499		—			—		2,499
Municipal bonds		451		—			—		451

Total available-for-sale securities		50,256		—			—		50,256

Total cash and cash equivalents	$	95,800	$	—		$	—	$	95,800


Short-term Investments:
Available-for-sale securities:
Municipal bonds	$	119,289	$	(11	)	$	182	$	119,460
Variable-rate demand notes		38,025		—			—		38,025
Corporate bonds		17,788		(4	)		60		17,844
Commercial paper		3,748		—			—		3,748
Asset-backed securities		515		—			1		516

Total short-term investments	$	179,365	$	(15	)	$	243	$	179,593


Long-term Investments:
Available-for-sale securities:
Auction rate securities	$	12,425	$	(1,793	)	$	—	$	10,632

Total long-term investments	$	12,425	$	(1,793	)	$	—	$	10,632

Schedule of available-for-sale investments in continuous unrealized loss position by length of time

	Less Than 12 Months					12 Months or Greater					Total
As of January 3, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Municipal bonds	$	23,735	$	(25	)	$	—	$	—		$	23,735	$	(25	)
Corporate bonds		20,327		(35	)		—		—			20,327		(35	)
Auction rate securities		—		—			7,419		(581	)		7,419		(581	)
Asset-backed securities		5,080		(3	)		—		—			5,080		(3	)
International government bond		2,516		(10	)		—		—			2,516		(10	)

	$	51,658	$	(73	)	$	7,419	$	(581	)	$	59,077	$	(654	)

	Less Than 12 Months					12 Months or Greater					Total
As of December 28, 2013	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Municipal bonds	$	11,079	$	(11	)	$	—	$	—		$	11,079	$	(11	)
Auction rate securities		—		—			10,632		(1,793	)		10,632		(1,793	)
Corporate bonds		2,605		(4	)		—		—			2,605		(4	)

	$	13,684	$	(15	)	$	10,632	$	(1,793	)	$	24,316	$	(1,808	)

Summarization of contractual underlying maturities of available-for-sale investments

The following summarizes the contractual underlying maturities of the Company's available-for-sale investments at January 3, 2015 (in thousands):

	Cost		Fair Value
Due in one year or less	$	208,047	$	208,166
Due after one year through ten years		62,464		62,470
Due after ten years		20,415		19,834

	$	290,926	$	290,470

Derivative Financial Instruments (Tables)

12 Months Ended

Jan. 03, 2015

Derivative Financial Instruments

Schedule of derivative financial instrument

The Company's derivative financial instrument in cash flow hedging relationships consisted of the following (in thousands):

		Fair Value
	Balance Sheet Location	January 3, 2015		December 28, 2013
Interest rate swap	Other assets, net	$	331	$	513

Schedule of before-tax effect of derivative instruments in cash flow hedging relationships

The before-tax effect of derivative instruments in cash flow hedging relationships was as follows (in thousands):

	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during the Year Ended								Location of Loss Reclassified into Income	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Year Ended
	January 3, 2015			December 28, 2013		December 29, 2012				January 3, 2015			December 28, 2013			December 29, 2012
Interest rate swaps	$	(799	)	$	611	$	(956	)	Rent expense	$	—		$	—		$	(2,197	)
									Interest expense		(618	)		(560	)		(98	)

Schedule of before-tax effect of derivative instruments not designated as hedging instruments

The before-tax effect of derivative instruments not designated as hedging instruments was as follows (in thousands):

Gain Recognized in Income		Year Ended January 3, 2015			Location
Foreign currency forward contracts		$	1,075		Other income (expense), net

Fair Value of Financial Instruments (Tables)

12 Months Ended

Jan. 03, 2015

Fair Value of Financial Instruments

Financial assets and liabilities measured at fair value on a recurring basis

The following summarizes the valuation of the Company's financial instruments (in thousands)

	Fair Value Measurements at January 3, 2015 Using
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash Equivalents:
Money market funds	$	71,415	$	—	$	—	$	71,415
Certificates of deposit		—		7,739		—		7,739
Commercial paper		—		5,348		—		5,348
Municipal bonds		—		1,757		—		1,757
U.S. government agency		—		1,202		—		1,202
Corporate bonds		—		1,101		—		1,101
U.S. government bonds		1,000		—		—		1,000

Total cash equivalents	$	72,415	$	17,147	$	—	$	89,562
Short-term Investments:
Municipal bonds	$	—	$	129,152	$	—	$	129,152
Corporate bonds		—		33,033		—		33,033
Variable-rate demand notes		—		12,915		—		12,915
Commercial paper		—		8,995		—		8,995
Asset-backed securities		—		5,377		—		5,377
International government bonds		—		2,516		—		2,516
U.S. government bond		650		—		—		650
U.S. government agency		—		601		—		601
Certificates of deposit		—		250		—		250

Total short-term investments	$	650	$	192,839	$	—	$	193,489
Long-term Investments:
Auction rate securities	$	—	$	—	$	7,419	$	7,419

Total long-term investments	$	—	$	—	$	7,419	$	7,419
Other assets, net:
Derivative instruments	$	—	$	331	$	—	$	331

Total	$	—	$	331	$	—	$	331

Total	$	73,065	$	210,317	$	7,419	$	290,801


Liabilities:
Accrued expenses:
Contingent consideration	$	—	$	—	$	4,288	$	4,288
Other non-current liabilities:
Contingent consideration	$	—	$	—	$	14,150	$	14,150

Total	$	—	$	—	$	18,438	$	18,438

	Fair Value Measurements at December 28, 2013 Using
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash Equivalents:
Money market funds	$	39,538	$	—	$	—	$	39,538
Certificates of deposit		—		7,768		—		7,768
Commercial paper		—		2,499		—		2,499
Municipal bonds		—		451		—		451

Total cash equivalents	$	39,538	$	10,718	$	—	$	50,256
Short-term Investments:
Municipal bonds	$	—	$	119,460	$	—	$	119,460
Variable-rate demand notes		—		38,025		—		38,025
Corporate bonds		—		17,844		—		17,844
Commercial paper		—		3,748		—		3,748
Asset-backed securities		—		516		—		516

Total short-term investments	$	—	$	179,593	$	—	$	179,593
Long-term Investments:
Auction rate securities	$	—	$	—	$	10,632	$	10,632

Total long-term investments	$	—	$	—	$	10,632	$	10,632
Other assets, net:
Derivative instruments	$	—	$	513	$	—	$	513

Total	$	—	$	513	$	—	$	513

Total	$	39,538	$	190,824	$	10,632	$	240,994


Liabilities:
Other non-current liabilities:
Contingent consideration	$	—	$	—	$	12,919	$	12,919

Total	$	—	$	—	$	12,919	$	12,919

Summary of quantitative information about level 3 asset fair value measurements

Fair Value at January 3, 2015 (000s)	Valuation Technique	Unobservable Input	Weighted Average
$7,419	Discounted cash flow	Estimated yield	1.04%
		Expected holding period	10 years
		Estimated discount rate	3.23%

Summary of quantitative information about level 3 liability fair value measurements

Fair Value at January 3, 2015 (000s)	Valuation Technique	Unobservable Input	Range
$18,438	Monte Carlo simulation	Expected revenue growth rate	35.6% - 69.1%
		Expected revenue volatility	20.0%
		Expected term	0.0 years - 4.0 years
		Estimated discount rate	0.1% - 1.7%

Summary of activity in Level 3 financial instruments

The following summarizes the activity in Level 3 financial instruments for the years ended January 3, 2015 and December 28, 2013 (in thousands):

Assets

	Year Ended
Auction Rate Securities	January 3, 2015			December 28, 2013
Beginning balance	$	10,632		$	11,369
Settlements		(4,425	)		(100	)
Gain (loss) included in other comprehensive income		1,212			(637	)

Ending balance	$	7,419		$	10,632

Liabilities

	Year Ended
Contingent Consideration (1)	January 3, 2015			December 28, 2013
Beginning balance	$	12,919		$	2,750
Issues		—			13,964
(Gain) loss recognized in earnings (2)		5,519			(3,795	)

Ending balance	$	18,438		$	12,919


Net gain (loss) for the period included in earnings attributable to contingent consideration held at the end of the period:	$	(5,519	)	$	1,045

(1)	In connection with the acquisition of Energy Micro and Ember, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation model are recorded in selling, general and administrative expenses in the Consolidated Statement of Income.
(2)	Changes to the estimated fair value of contingent consideration were primarily due to revisions to the Company's expectations of earn-out achievement.

Balance Sheet Details (Tables)

12 Months Ended

Jan. 03, 2015

Balance Sheet Details

Inventories

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Inventories

	January 3, 2015		December 28, 2013
Work in progress	$	40,640	$	34,503
Finished goods		11,991		10,768

	$	52,631	$	45,271

Prepaid Expenses and Other Current Assets

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Prepaid Expenses and Other Current Assets

	January 3, 2015		December 28, 2013
Distributor advances	$	32,932	$	31,839
Other		16,239		15,812

	$	49,171	$	47,651

Property and Equipment

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Property and Equipment

	January 3, 2015			December 28, 2013
Buildings and improvements	$	94,453		$	94,221
Equipment		51,654			51,071
Computers and purchased software		27,282			25,556
Leasehold interest in ground leases		23,840			23,840
Furniture and fixtures		4,008			3,496
Leasehold improvements		8,901			7,784

		210,138			205,968
Accumulated depreciation		(77,318	)		(73,523	)

	$	132,820		$	132,445

Accrued Expenses

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Accrued Expenses

	January 3, 2015		December 28, 2013
Accrued compensation and benefits	$	28,443	$	24,896
Acquisition-related holdback		20,010		—
Other		25,193		21,079

	$	73,646	$	45,975

Other Non-current Liabilities

The following tables show the details of selected Consolidated Balance Sheet items (in thousands):

Other Non-current Liabilities

	January 3, 2015		December 28, 2013
Contingent consideration	$	14,150	$	12,919
Acquisition-related holdback		—		20,010
Other		29,541		23,012

	$	43,691	$	55,941

Risks and Uncertainties (Tables) - Customers

12 Months Ended

Jan. 03, 2015

Accounts receivable

Risks and uncertainties

Schedule of concentration risk

	January 3, 2015			December 28, 2013
Edom Technology		25	%		26	%
Arrow Electronics		11	%		10	%
Avnet		11	%		**

**	Less than 10% of accounts receivable

Revenue

Risks and uncertainties

Schedule of concentration risk

	Year Ended
	January 3, 2015			December 28, 2013			December 29, 2012
End Customers
Samsung*		12	%		15	%		19	%
Distributors
Edom Technology		20	%		21	%		22	%
Avnet		12	%		11	%		11	%

*	Samsung's purchases were across a variety of product areas.

Acquisitions (Tables)

12 Months Ended

Jan. 03, 2015

Energy Micro

Business acquisition

Schedule of purchase price allocation

The purchase price was allocated as follows (in thousands):

	Amount			Weighted-Average Amortization Period (Years)
Intangible assets:
In-process research and development	$	18,600		Not amortized
Core and developed technology		29,100		7
Customer relationships		6,400		8
Trademarks		1,300		8

		55,400
Cash and cash equivalents		919
Other current assets		6,486
Goodwill		98,515
Other non-current assets		3,117
Current liabilities		(8,000	)
Non-current deferred tax liabilities, net		(6,288	)
Long-term debt		(8,434	)
Other non-current liabilities		(1,133	)

Total purchase price	$	140,582

Ember

Business acquisition

Schedule of purchase price allocation

The purchase price was allocated as follows (in thousands):

	Amount			Weighted-Average Amortization Period (Years)
Intangible assets:
In-process research and development	$	14,810		Not amortized
Developed technology		17,800		11
Customer relationships		5,620		9
Trademarks		910		12

		39,140
Cash and cash equivalents		3,115
Accounts receivable		1,928
Inventories		4,749
Other current assets		324
Goodwill		14,777
Non-current deferred tax assets, net		16,449
Other non-current assets		1,776
Current liabilities		(3,287	)

Total purchase price	$	78,971

Corporate Headquarters Buildings

Business acquisition

Schedule of purchase price allocation

The purchase price was allocated as follows (in thousands):

	Amount
Buildings	$	90,900
Leasehold interest in ground leases		23,840
Acquired unfavorable leases		(11,925	)
Lease-related charges		(8	)
Net gain on purchase		(8,457	)

Total purchase price	$	94,350

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Jan. 03, 2015

Goodwill and Other Intangible Assets

Summary of goodwill activity

The following summarizes the activity in goodwill for the years ended January 3, 2015 and December 28, 2013 (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013
Beginning balance	$	228,781	$	130,265
Additions due to business combinations		—		98,516

Ending balance	$	228,781	$	228,781

Schedule of gross carrying amount and accumulated amortization of other intangible assets

The gross carrying amount and accumulated amortization of other intangible assets are as follows (in thousands):

		January 3, 2015					December 28, 2013
	Weighted-Average Amortization Period (Years)	January 3, 2015					December 28, 2013
	Weighted-Average Amortization Period (Years)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
Intangible assets:
Subject to amortization:
Core and developed technology	9	$	148,891	$	(47,894	)	$	138,340	$	(41,782	)
Customer relationships	9		14,500		(4,003	)		14,500		(2,330	)
Patents	6		3,000		(1,250	)		3,000		(750	)
Trademarks	10		2,210		(433	)		2,210		(195	)

	9		168,601		(53,580	)		158,050		(45,057	)
Not subject to amortization:
In-process research and development	Not amortized		—		—			18,600		—

Total intangible assets		$	168,601	$	(53,580	)	$	176,650	$	(45,057	)

Schedule of estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years

The estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years is as follows (in thousands):

Fiscal Year
2015	$	19,331
2016		18,682
2017		17,715
2018		16,690
2019		14,251

Debt (Tables)

12 Months Ended

Jan. 03, 2015

Debt

Schedule of remaining contractual maturities of the Term Loan Facility

As of January 3, 2015, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):

Fiscal Year
2015	$	10,000
2016		10,000
2017		67,500

Total	$	87,500

Stockholders' Equity (Tables)

12 Months Ended

Jan. 03, 2015

Stockholders' Equity

Schedule of share repurchase programs

The Board of Directors authorized the following share repurchase programs (in thousands):

Program Authorization Date	Program Termination Date	Program Amount
October 2014	December 2015	$	100,000
January 2014	January 2015	$	100,000
January 2013	January 2014	$	50,000
April 2012	January 2013	$	100,000
October 2011	April 2012	$	50,000

Schedule of components of accumulated other comprehensive loss, net of taxes

The components of accumulated other comprehensive loss, net of taxes, were as follows (in thousands):

	Unrealized Gain (Loss) on Cash Flow Hedge			Net Unrealized Losses on Available- For-Sale Securities			Total
Balance at December 31, 2011	$	(1,299	)	$	(1,168	)	$	(2,467	)
Other comprehensive income (loss) before reclassifications		(621	)		650			29
Amount reclassified from accumulated other comprehensive loss		1,492			—			1,492

Net change for the period		871			650			1,521

Balance at December 29, 2012		(428	)		(518	)		(946	)
Other comprehensive income (loss) before reclassifications		397			(348	)		49
Amount reclassified from accumulated other comprehensive loss		364			(151	)		213

Net change for the period		761			(499	)		262

Balance at December 28, 2013		333			(1,017	)		(684	)
Other comprehensive income (loss) before reclassifications		(520	)		720			200
Amount reclassified from accumulated other comprehensive loss		402			—			402

Net change for the period		(118	)		720			602

Balance at January 3, 2015	$	215		$	(297	)	$	(82	)

Schedule of Reclassifications From Accumulated Other Comprehensive Loss

	Year ended
Reclassification (in thousands)	January 3, 2015			December 28, 2013			December 29, 2012
Losses on cash flow hedges to:
Rent expense	$	—		$	—		$	(2,295	)
Interest expense		(618	)		(560	)		—
Gains on available-for-sales securities to:
Interest income		—			232			—

		(618	)		(328	)		(2,295	)
Income tax benefit		216			115			803

Total reclassifications	$	(402	)	$	(213	)	$	(1,492	)

Schedule of changes in the components of comprehensive income, tax effects

The income tax effects of the components of other comprehensive income were as follows (in thousands):

	Year ended
Income tax (expense) benefit on:	January 3, 2015			December 28, 2013			December 29, 2012
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	$	(387	)	$	187		$	(350	)
Reclassification for gains included in net income		—			81			—
Net changes to cash flow hedges:
Unrealized gains (losses) arising during the period		279			(214	)		335
Reclassification for losses included in net income		(216	)		(196	)		(803	)

Other comprehensive income	$	(324	)	$	(142	)	$	(818	)

Stock-Based Compensation (Tables)

12 Months Ended

Jan. 03, 2015

Stock-Based Compensation

Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model for Employee Stock Purchase Plan

	Year Ended
2009 Employee Stock Purchase Plan	January 3, 2015			December 28, 2013			December 29, 2012
Expected volatility		28	%		27	%		38	%
Risk-free interest rate %		0.2	%		0.1	%		0.2	%
Expected term (in months)		15			7			15
Dividend yield		—			—			—

Schedule of assumptions used to estimate fair values using Monte Carlo simulation model for Stock Incentive Plan

	Year Ended
2009 Stock Incentive Plan	January 3, 2015			December 28, 2013			December 29, 2012
Expected volatility		33	%		32	%		32	%
Risk-free interest rate %		0.7	%		0.5	%		0.4	%
Expected term (in years)		2.8			2.9			2.9
Dividend yield		—			—			—

Summary of Stock Options activity

Stock Options	Shares (000s)			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		1,089		$	35.09
Exercised		(444	)	$	35.67
Cancelled or expired		(116	)	$	49.19

Outstanding at January 3, 2015		529		$	31.50		1.61	$	8,661
Vested at January 3, 2015 and expected to vest		529		$	31.50		1.61	$	8,661
Exercisable at January 3, 2015		529		$	31.50		1.61	$	8,661

Summary of RSAs and RSUs Activity

RSAs and RSUs	Shares (000s)			Weighted- Average Purchase Price		Weighted-Average Remaining Vesting Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		1,835		$	—
Granted		735		$	—
Issued		(680	)	$	—
Cancelled or expired		(109	)	$	—

Outstanding at January 3, 2015		1,781		$	—		1.02	$	84,584
Outstanding at January 3, 2015 and expected to vest		1,654		$	—		1.02	$	78,567

Summary of MSUs Activity

MSUs	Shares (000s)			Weighted- Average Purchase Price		Weighted-Average Remaining Vesting Term (In Years)		Aggregate Intrinsic Value (000s)
Outstanding at December 28, 2013		246		$	—
Granted		76		$	—
Issued		—		$	—
Cancelled or expired		(24	)	$	—

Outstanding at January 3, 2015		298		$	—		1.18	$	14,181
Outstanding at January 3, 2015 and expected to vest		274		$	—		1.18	$	13,034

Summary of weighted average fair value at the date of grant

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Per grant of RSAs and RSUs	$	47.93	$	43.01	$	42.25
Per grant of MSUs	$	60.08	$	31.94	$	53.25

Summary of stock-based payment and stock option values

The following summarizes the Company's stock-based payment and stock option values (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Intrinsic value of stock options exercised	$	5,674	$	4,198	$	9,064
Intrinsic value of RSAs and RSUs that vested	$	32,138	$	23,649	$	40,105
Grant date fair value of RSAs and RSUs that vested	$	29,668	$	24,026	$	31,215

Schedule of stock-based compensation costs recognized in the Consolidated Statements of Income

The following table presents details of stock-based compensation costs recognized in the Consolidated Statements of Income (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Cost of revenues	$	775	$	952	$	1,206
Research and development		18,521		14,530		12,602
Selling, general and administrative		19,771		15,318		17,368

		39,067		30,800		31,176
Income tax benefit		4,024		2,633		4,911

	$	35,043	$	28,167	$	26,265

Summary of shares reserved of common stock for future issuance

As of January 3, 2015, the Company had reserved shares of common stock for future issuance as follows (in thousands):

2000 Stock Incentive Plan			529
2009 Stock Incentive Plan			3,740
2009 Employee Stock Purchase Plan			882

Total shares reserved			5,151

Commitments and Contingencies (Tables)

12 Months Ended

Jan. 03, 2015

Commitments and Contingencies

Schedule of minimum annual future rentals

The minimum annual future rentals under the terms of these leases as of January 3, 2015 are as follows (in thousands):

Fiscal Year
2015	$	4,463
2016		4,137
2017		3,398
2018		2,517
2019		1,490
Thereafter		6,398

Total minimum lease payments	$	22,403

Income Taxes (Tables)

12 Months Ended

Jan. 03, 2015

Income Taxes

Components of the provision (benefit) for income taxes

Significant components of the provision for income taxes are as follows (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013			December 29, 2012
Current:
Domestic	$	7,083	$	4,796		$	21,084
International		882		4,093			(3,009	)

Total Current		7,965		8,889			18,075
Deferred:
Domestic		2,352		5,591			5,444
International		702		(2,272	)		(719	)

Total Deferred		3,054		3,319			4,725

	$	11,019	$	12,208		$	22,800

Summary of effective income tax rate reconciliation

	Year Ended
	January 3, 2015			December 28, 2013			December 29, 2012
Federal statutory rate		35.0	%		35.0	%		35.0	%
Foreign tax rate benefit		(3.5	)		(8.2	)		(11.8	)
Research and development tax credits		(8.6	)		(12.8	)		(0.5	)
Release of prior year unrecognized tax benefits		(2.6	)		—			(8.4	)
Intercompany technology license		—			—			11.8
Excess officer compensation		2.3			1.9			1.0
Change in prior period valuation allowance		(1.4	)		3.1			—
Other		1.3			0.7			(0.7	)

		22.5	%		19.7	%		26.4	%

Schedule of components of income before income taxes

Income before income taxes included the following components (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Domestic	$	38,174	$	41,849	$	80,494
Foreign		10,866		20,178		5,854

	$	49,040	$	62,027	$	86,348

Significant components of the Company's deferred taxes

Significant components of the Company's deferred taxes as of January 3, 2015 and December 28, 2013 are as follows (in thousands):

	January 3, 2015			December 28, 2013
Deferred tax assets:
Net operating loss carryforwards	$	31,518		$	38,399
Research and development tax credit carryforwards		9,740			9,276
Stock-based compensation		6,353			6,757
Capitalized research and development		7,371			8,999
Deferred income on shipments to distributors		8,117			5,733
Accrued liabilities and other		6,481			8,302

		69,580			77,466
Less: Valuation allowance		(3,455	)		(3,775	)

		66,125			73,691
Deferred tax liabilities:
Acquired intangible assets		33,630			38,444
Depreciation and amortization		3,388			2,022
Prepaid expenses and other		1,517			1,889

		38,535			42,355

Net deferred tax assets	$	27,590		$	31,336

Schedule of changes in the unrecognized tax benefits

The following table reflects changes in the unrecognized tax benefits (in thousands):

	Year Ended
	January 3, 2015			December 28, 2013		December 29, 2012
Beginning balance	$	4,998		$	4,364	$	10,943
Additions based on tax positions related to current year		465			316		1,818
Additions based on tax positions related to prior years		58			318		—
Reductions for tax positions related to prior years		(1,592	)		—		(8,397	)

Ending balance	$	3,929		$	4,998	$	4,364

Segment Information (Tables)

12 Months Ended

Jan. 03, 2015

Segment Information

Summary of the Company's revenue by product category

The following summarizes the Company's revenue by product category (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
Broad-based	$	317,128	$	281,777	$	270,098
Broadcast		204,256		199,837		186,067
Access		99,320		98,473		107,129

Total	$	620,704	$	580,087	$	563,294

Schedule of revenue attributed to geographic area based on the end customer's shipped-to location

The following summarizes the Company's revenue by geographic area (in thousands):

	Year Ended
	January 3, 2015		December 28, 2013		December 29, 2012
United States	$	89,935	$	68,566	$	64,856
China		271,818		253,261		219,400
Taiwan		57,191		55,036		64,150
South Korea		12,824		21,303		57,910
Rest of world		188,936		181,921		156,978

Total	$	620,704	$	580,087	$	563,294

Schedule of property and equipment, net by geographic area

The following summarizes the Company's property and equipment, net by geographic area (in thousands):

	January 3, 2015		December 28, 2013
United States	$	127,928	$	126,263
Rest of world		4,892		6,182

Total	$	132,820	$	132,445

Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Basis of Presentation and Principles of Consolidation
Length of fiscal year	371 days	364 days	364 days
Advertising
Advertising expenses	$ 1.7	$ 2.0	$ 1.7
Buildings
Property and Equipment
Useful life			40 years
Leasehold interest in ground leases
Property and Equipment
Useful life			86 years
Low end of range
Basis of Presentation and Principles of Consolidation
Length of fiscal year	364 days
Property and Equipment
Useful life	3 years
Long-Lived Assets
Useful live of purchased intangible assets	4 years
High end of range
Basis of Presentation and Principles of Consolidation
Length of fiscal year	371 days
Property and Equipment
Useful life	7 years
Long-Lived Assets
Useful live of purchased intangible assets	12 years

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Earnings Per Share
Net income	$ 38,021	$ 49,819	$ 63,548
Shares used in computing basic earnings per share	42,970	42,715	42,136
Effect of dilutive securities:
Stock options and other stock-based awards (in shares)	823	822	970
Shares used in computing diluted earnings per share	43,793	43,537	43,106
Earnings per share:
Basic (in dollars per share)	$ 0.88	$ 1.17	$ 1.51
Diluted (in dollars per share)	$ 0.87	$ 1.14	$ 1.47
Shares excluded from computation of diluted earning per share	100	400	500

Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Cash, Cash Equivalents and Investments
Auction-rate securities guaranteed by the U.S. government	$ 6,000
Auction-rate securities privately insured	2,000
Auction-rate securities having credit rating 'AA'	6,000
Auction-rate securities having credit rating 'A'	2,000
Other-than-temporary impairment losses	0
Cash on hand, Cost	52,144	$ 45,544
Cash on hand, Fair Value	52,144	45,544
Cash and cash equivalents, Cost	141,705	95,800
Cash and cash equivalents, Gross Unrealized Gains	1
Cash and cash equivalents, Fair Value	141,706	95,800
Available-for-sale securities
Total Cost	290,926	50,256
Available-for-sale securities, Fair Value		50,256
Cash Equivalents:
Available-for-sale securities
Total Cost	89,561
Available-for-sale securities, Gross Unrealized Gains	1
Available-for-sale securities, Fair Value	89,562
Short-term Investments:
Available-for-sale securities
Total Cost	193,365	179,365
Available-for-sale securities, Gross Unrealized Losses	(73)	(15)
Available-for-sale securities, Gross Unrealized Gains	197	243
Available-for-sale securities, Fair Value	193,489	179,593
Long-term Investments:
Available-for-sale securities
Total Cost	8,000	12,425
Available-for-sale securities, Gross Unrealized Losses	(581)	(1,793)
Available-for-sale securities, Fair Value	7,419	10,632
Money market funds \| Cash Equivalents:
Available-for-sale securities
Total Cost	71,415	39,538
Available-for-sale securities, Fair Value	71,415	39,538
Commercial paper \| Cash Equivalents:
Available-for-sale securities
Total Cost	5,348	2,499
Available-for-sale securities, Fair Value	5,348	2,499
Commercial paper \| Short-term Investments:
Available-for-sale securities
Total Cost	8,995	3,748
Available-for-sale securities, Fair Value	8,995	3,748
Certificates of deposit \| Cash Equivalents:
Available-for-sale securities
Total Cost	7,739	7,768
Available-for-sale securities, Fair Value	7,739	7,768
Certificates of deposit \| Short-term Investments:
Available-for-sale securities
Total Cost	250
Available-for-sale securities, Fair Value	250
Municipal bonds \| Cash Equivalents:
Available-for-sale securities
Total Cost	1,756	451
Available-for-sale securities, Gross Unrealized Gains	1
Available-for-sale securities, Fair Value	1,757	451
Municipal bonds \| Short-term Investments:
Available-for-sale securities
Total Cost	129,005	119,289
Available-for-sale securities, Gross Unrealized Losses	(25)	(11)
Available-for-sale securities, Gross Unrealized Gains	172	182
Available-for-sale securities, Fair Value	129,152	119,460
Corporate bonds \| Cash Equivalents:
Available-for-sale securities
Total Cost	1,101
Available-for-sale securities, Fair Value	1,101
Corporate bonds \| Short-term Investments:
Available-for-sale securities
Total Cost	33,043	17,788
Available-for-sale securities, Gross Unrealized Losses	(35)	(4)
Available-for-sale securities, Gross Unrealized Gains	25	60
Available-for-sale securities, Fair Value	33,033	17,844
Variable-rate demand notes \| Short-term Investments:
Available-for-sale securities
Total Cost	12,915	38,025
Available-for-sale securities, Fair Value	12,915	38,025
Asset-backed securities \| Short-term Investments:
Available-for-sale securities
Total Cost	5,380	515
Available-for-sale securities, Gross Unrealized Losses	(3)
Available-for-sale securities, Gross Unrealized Gains		1
Available-for-sale securities, Fair Value	5,377	516
International government bonds \| Short-term Investments:
Available-for-sale securities
Total Cost	2,526
Available-for-sale securities, Gross Unrealized Losses	(10)
Available-for-sale securities, Fair Value	2,516
U.S. government bonds \| Cash Equivalents:
Available-for-sale securities
Total Cost	1,000
Available-for-sale securities, Fair Value	1,000
U.S. government bonds \| Short-term Investments:
Available-for-sale securities
Total Cost	650
Available-for-sale securities, Fair Value	650
US government agency \| Cash Equivalents:
Available-for-sale securities
Total Cost	1,202
Available-for-sale securities, Fair Value	1,202
US government agency \| Short-term Investments:
Available-for-sale securities
Total Cost	601
Available-for-sale securities, Fair Value	601
Auction rate securities \| Long-term Investments:
Available-for-sale securities
Total Cost	8,000	12,425
Available-for-sale securities, Gross Unrealized Losses	(581)	(1,793)
Available-for-sale securities, Fair Value	$ 7,419	$ 10,632

Cash, Cash Equivalents and Investments (Details 2) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for less than twelve months	$ 51,658	$ 13,684
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	7,419	10,632
Total fair value of available-for-sale securities, continuous loss position	59,077	24,316
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	(73)	(15)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	(581)	(1,793)
Available-for-sale securities, total gross unrealized losses	(654)	(1,808)
Cost
Due in one year or less, Cost	208,047
Due after one year through ten years, Cost	62,464
Due after ten years, Cost	20,415
Total Cost	290,926	50,256
Fair Value
Due in one year or less, Fair Value	208,166
Due after one year through ten years, Fair Value	62,470
Due after ten years, Fair Value	19,834
Total Fair Value	290,470
Corporate bonds
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for less than twelve months	20,327	2,605
Total fair value of available-for-sale securities, continuous loss position	20,327	2,605
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	(35)	(4)
Available-for-sale securities, total gross unrealized losses	(35)	(4)
Auction rate securities
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	7,419	10,632
Total fair value of available-for-sale securities, continuous loss position	7,419	10,632
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	(581)	(1,793)
Available-for-sale securities, total gross unrealized losses	(581)	(1,793)
Municipal bonds
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for less than twelve months	23,735	11,079
Total fair value of available-for-sale securities, continuous loss position	23,735	11,079
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	(25)	(11)
Available-for-sale securities, total gross unrealized losses	(25)	$ (11)
Asset-backed securities
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for less than twelve months	5,080
Total fair value of available-for-sale securities, continuous loss position	5,080
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	(3)
Available-for-sale securities, total gross unrealized losses	(3)
International government bonds
Continuous unrealized loss position, Fair Value
Fair value of available-for-sale securities, continuous loss position for less than twelve months	2,516
Total fair value of available-for-sale securities, continuous loss position	2,516
Continuous unrealized loss position, Gross Unrealized Losses
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	(10)
Available-for-sale securities, total gross unrealized losses	$ (10)

Derivative Financial Instruments (Details) $ in Millions	Jan. 03, 2015 USD ($)
Cash flow hedges \| Interest rate swaps
Notional amount
Original notional value	$ 100

Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 29, 2012	Dec. 28, 2013
Derivative Financial Instruments
Notional value of interest rate swap agreement hedging headquarters lease		$ 50,100
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period		$ 900
Gains or losses from the hedging instrument which was excluded from the assessment of effectiveness	$ 0
Other assets, net
Derivative financial instrument
Fair value of interest rate swap	$ 331		$ 513

Derivative Financial Instruments (Details 3) $ in Thousands	12 Months Ended
Derivative Financial Instruments (Details 3) $ in Thousands	Jan. 03, 2015 USD ($) contract	Dec. 28, 2013 USD ($) contract	Dec. 29, 2012 USD ($)
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period			$ 900
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months	$ 400
Not Designated as Hedging Instrument \| Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Number of foreign currency forward contract held \| contract	1	0
Original notional value	$ 7,700
Not Designated as Hedging Instrument \| Foreign currency forward contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	1,075
Cash flow hedges \| Interest rate swaps
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period	(799)	$ 611	(956)
Original notional value	100,000
Cash flow hedges \| Interest rate swaps \| Rent expenses
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period			(2,197)
Cash flow hedges \| Interest rate swaps \| Interest expense
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period	$ (618)	$ (560)	$ (98)

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	$ 141,706	$ 95,800
Total short-term investments	193,489	179,593
Total long-term investments	7,419	10,632
Assets and liabilities measured at fair value on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	72,415	39,538
Total short-term investments	650
Total assets at fair value	73,065	39,538
Assets and liabilities measured at fair value on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	71,415	39,538
Assets and liabilities measured at fair value on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,000
Total short-term investments	650
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2)
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	17,147	10,718
Total short-term investments	192,839	179,593
Derivative instruments	331	513
Other assets, net	331	513
Total assets at fair value	210,317	190,824
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Certificates of deposit
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	7,739	7,768
Total short-term investments	250
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	5,348	2,499
Total short-term investments	8,995	3,748
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Municipal bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,757	451
Total short-term investments	129,152	119,460
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,101
Total short-term investments	33,033	17,844
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Variable-rate demand notes
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	12,915	38,025
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| Asset-backed securities
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	5,377	516
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| International government bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	2,516
Assets and liabilities measured at fair value on recurring basis \| Significant Other Observable Inputs (Level 2) \| US government agency
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,202
Total short-term investments	601
Assets and liabilities measured at fair value on recurring basis \| Significant Unobservable Inputs (Level 3)
Financial assets and liabilities measured at fair value on a recurring basis
Total long-term investments	7,419	10,632
Total assets at fair value	7,419	10,632
Total liabilities at fair value	18,438	12,919
Assets and liabilities measured at fair value on recurring basis \| Significant Unobservable Inputs (Level 3) \| Other non-current liabilities:
Financial assets and liabilities measured at fair value on a recurring basis
Contingent consideration	14,150	12,919
Assets and liabilities measured at fair value on recurring basis \| Significant Unobservable Inputs (Level 3) \| Auction rate securities
Financial assets and liabilities measured at fair value on a recurring basis
Total long-term investments	7,419	10,632
Assets and liabilities measured at fair value on recurring basis \| Significant Unobservable Inputs (Level 3) \| Auction rate securities \| Accrued expenses:
Financial assets and liabilities measured at fair value on a recurring basis
Contingent consideration	4,288
Assets and liabilities measured at fair value on recurring basis \| Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	89,562	50,256
Total short-term investments	193,489	179,593
Total long-term investments	7,419	10,632
Derivative instruments	331	513
Other assets, net	331	513
Total assets at fair value	290,801	240,994
Total liabilities at fair value	18,438	12,919
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Other non-current liabilities:
Financial assets and liabilities measured at fair value on a recurring basis
Contingent consideration	14,150	12,919
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	71,415	39,538
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Certificates of deposit
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	7,739	7,768
Total short-term investments	250
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Commercial paper
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	5,348	2,499
Total short-term investments	8,995	3,748
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Municipal bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,757	451
Total short-term investments	129,152	119,460
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Corporate bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,101
Total short-term investments	33,033	17,844
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Variable-rate demand notes
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	12,915	38,025
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Asset-backed securities
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	5,377	516
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| International government bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total short-term investments	2,516
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| U.S. government bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,000
Total short-term investments	650
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| US government agency
Financial assets and liabilities measured at fair value on a recurring basis
Total cash equivalents	1,202
Total short-term investments	601
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Auction rate securities
Financial assets and liabilities measured at fair value on a recurring basis
Total long-term investments	7,419	$ 10,632
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| Auction rate securities \| Accrued expenses:
Financial assets and liabilities measured at fair value on a recurring basis
Contingent consideration	$ 4,288

Fair Value of Financial Instruments (Details 2) - Auction rate securities - Weighted Average - Discounted cash flow	12 Months Ended
	Jan. 03, 2015
Quantitative information for Level 3 Fair Value Measurements Assets
Estimated yield (as a percent)	1.04%
Expected holding period	10 years
Estimated discount rate (as a percent)	3.23%

Fair Value of Financial Instruments (Details 3) - Contingent consideration - Monte Carlo simulation	12 Months Ended
	Jan. 03, 2015
Quantitative information for Level 3 fair value measurements liabilities
Expected revenue volatility (as a percent)	20.00%
Low end of range
Quantitative information for Level 3 fair value measurements liabilities
Expected revenue growth rate (as a percent)	35.60%
Expected term	0 years
Estimated discount rate (as a percent)	0.10%
High end of range
Quantitative information for Level 3 fair value measurements liabilities
Expected revenue growth rate (as a percent)	69.10%
Expected term	4 years
Estimated discount rate (as a percent)	1.70%

Fair Value of Financial Instruments (Details 4) - Assets and liabilities measured at fair value on recurring basis - Auction rate securities - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Fair value assets reconciliation of changes
Balance at the beginning of the period	$ 10,632	$ 11,369
Settlements	(4,425)	(100)
Gain included in other comprehensive income	1,212	(637)
Balance at the end of the period	$ 7,419	$ 10,632

Fair Value of Financial Instruments (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Fair value liabilities reconciliation of changes
Fair value of debt	$ 87,400	$ 94,800
Assets and liabilities measured at fair value on recurring basis \| Contingent consideration
Fair value liabilities reconciliation of changes
Balance at the beginning of the period	12,919	2,750
Issues		13,964
Loss recognized in earnings	5,519	(3,795)
Balance at the end of the period	18,438	12,919
Net gain (loss) for the period included in earnings attributable to contingent consideration held at the end of the period:	$ (5,519)	$ 1,045

Balance Sheet Details (Details) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013
Inventories
Work in progress	$ 40,640	$ 34,503
Finished goods	11,991	10,768
Total inventories	52,631	45,271
Prepaid Expenses and Other Current Assets
Distributor Advances	32,932	31,839
Other	16,239	15,812
Prepaid expenses and other current assets	49,171	47,651
Property and Equipment
Property and equipment, gross	210,138	205,968
Accumulated depreciation	(77,318)	(73,523)
Property, Plant and Equipment, Net, Total	132,820	132,445
Accrued Expenses
Accrued compensation and benefits	28,443	24,896
Acquisition-related holdback	20,010
Other	25,193	21,079
Accrued Liabilities, Current, Total	73,646	45,975
Other Non-current Liabilities
Contingent consideration	14,150	12,919
Acquisition-related holdback		20,010
Other	29,541	23,012
Liabilities, Other than Long-term Debt, Noncurrent, Total	43,691	55,941
Buildings and improvements
Property and Equipment
Property and equipment, gross	94,453	94,221
Equipment
Property and Equipment
Property and equipment, gross	51,654	51,071
Computers and purchased software
Property and Equipment
Property and equipment, gross	27,282	25,556
Leasehold interest in ground leases
Property and Equipment
Property and equipment, gross	23,840	23,840
Furniture and fixtures
Property and Equipment
Property and equipment, gross	4,008	3,496
Leasehold improvements
Property and Equipment
Property and equipment, gross	$ 8,901	$ 7,784

Risks and Uncertainties (Details)	12 Months Ended
Risks and Uncertainties (Details)	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Risks and uncertainties
Interest rate on unsettled balances due upon demand (as a percent)	0.00%
Accounts receivable \| Customers \| Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	25.00%	26.00%
Accounts receivable \| Customers \| Arrow Electronics
Risks and uncertainties
Concentrations of credit risk (as a percent)	11.00%	10.00%
Accounts receivable \| Customers \| Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	11.00%
Accounts receivable \| Customers \| Avnet \| High end of range
Risks and uncertainties
Concentrations of credit risk (as a percent)		10.00%
Revenue \| Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	20.00%	21.00%	22.00%
Revenue \| Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	12.00%	11.00%	11.00%
Revenue \| Customers \| Samsung
Risks and uncertainties
Concentrations of credit risk (as a percent)	12.00%	15.00%	19.00%

Acquisitions (Details) shares in Millions				1 Months Ended	12 Months Ended
Acquisitions (Details) shares in Millions	Oct. 17, 2013 USD ($)	Jul. 01, 2013 USD ($) shares	Jul. 03, 2012 USD ($)	Sep. 30, 2012 USD ($) item	Jan. 03, 2015 USD ($)	Dec. 29, 2012 USD ($)	Dec. 28, 2013 USD ($)
Acquisition
Earn-Out, fair value					$ 14,150,000		$ 12,919,000
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters							20,010,000
Purchase price allocation
Goodwill					$ 228,781,000	$ 130,265,000	228,781,000
Weighted-Average Amortization Period					9 years
Net gain on purchase						$ (8,457,000)
Customer relationships
Purchase price allocation
Weighted-Average Amortization Period					9 years
Trademarks
Purchase price allocation
Weighted-Average Amortization Period					10 years
Energy Micro
Acquisition
Purchase price of acquisition		$ 140,600,000
Initial consideration	$ 107,400,000	107,400,000
Deferred consideration in the form of a promissory note, fair value		$ 19,200,000
Restricted stock exchanged of promissory note in form of deferred consideration on acquisition \| shares		0.5
Mandatory period of creditor notice after which the deferred consideration in the form of a promissory note will be exchanged for the entity's restricted stock		2 months
Earn-Out, fair value		$ 14,000,000
Additional consideration on acquisition	33,300,000	$ 33,300,000
Minimum annual revenue growth for additional consideration (as a percent)		25.00%
Earn out period		5 years
Maximum annual Earn-Out payment		$ 6,666,666
Minimum revenue in single fiscal year from Earn-Out products required to make the entire Earn-Out amount payable		400,000,000
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters	$ 20,300,000	$ 20,300,000
Percentage of Earn-Out contingent on the continued employment of certain key employees		28.76%
Period of continued employment of key employees for calculating Earn-out portion following acquisition date		3 years
Purchase price allocation
Intangible assets		$ 55,400,000
Cash and cash equivalents		919,000
Other current assets		6,486,000
Goodwill		98,515,000
Other non-current assets		3,117,000
Current liabilities		(8,000,000)
Non-current deferred tax liabilities, net		(6,288,000)
Long-term debt		(8,434,000)
Other non-current liabilities		(1,133,000)
Total purchase price		140,582,000
Acquisition-related costs recorded in selling, general and administrative expenses							$ 2,400,000
Energy Micro \| Core and developed technology
Purchase price allocation
Intangible assets		$ 29,100,000
Weighted-Average Amortization Period		7 years
Energy Micro \| Customer relationships
Purchase price allocation
Intangible assets		$ 6,400,000
Weighted-Average Amortization Period		8 years
Energy Micro \| Trademarks
Purchase price allocation
Intangible assets		$ 1,300,000
Weighted-Average Amortization Period		8 years
Energy Micro \| In-process research and development
Purchase price allocation
Intangible assets		$ 18,600,000
Discount rate applicable to the cash flows (as a percent)					13.00%
Ember
Acquisition
Purchase price of acquisition			$ 79,000,000
Estimated fair value			4,000,000
Purchase price allocation
Intangible assets			39,140,000
Cash and cash equivalents			3,115,000
Accounts receivable			1,928,000
Inventories			4,749,000
Other current assets			324,000
Goodwill			14,777,000
Deferred tax assets - non-current			16,449,000
Other non-current assets			1,776,000
Current liabilities			(3,287,000)
Total purchase price			78,971,000
Ember \| Developed technology
Purchase price allocation
Intangible assets			$ 17,800,000
Weighted-Average Amortization Period			11 years
Ember \| Customer relationships
Purchase price allocation
Intangible assets			$ 5,620,000
Weighted-Average Amortization Period			9 years
Ember \| Trademarks
Purchase price allocation
Intangible assets			$ 910,000
Weighted-Average Amortization Period			12 years
Ember \| In-process research and development
Purchase price allocation
Intangible assets			$ 14,810,000
Discount rate applicable to the cash flows (as a percent)					12.50%
Corporate Headquarters Buildings
Purchase price allocation
Total purchase price				$ 94,350,000
Buildings				90,900,000
Leasehold interest in ground leases				23,840,000
Acquired unfavorable leases				(11,925,000)
Lease-related charges				(8,000)
Net gain on purchase				$ (8,457,000)
Useful life of building				40 years
Useful life of leasehold interest in ground leases				86 years
Number of leases for which purchase prices were fixed \| item				2
400 WCC
Purchase price allocation
Purchase option price for buildings				$ 44,300,000
200 WCC
Purchase price allocation
Purchase option price for buildings				$ 50,100,000

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Goodwill
Goodwill, Beginning Balance	$ 228,781	$ 130,265
Additions due to business combinations		98,516
Goodwill, Ending Balance	$ 228,781	228,781	$ 130,265
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	$ 168,601	158,050
Intangible assets subject to amortization, Accumulated Amortization	(53,580)	(45,057)
Total intangible assets, Gross Amount	168,601	176,650
Fully amortized intangible assets, gross	9,400
Amortization expense related to intangible assets	17,900	14,600	$ 10,700
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years
2015	19,331
2016	18,682
2017	17,715
2018	16,690
2019	$ 14,251
In-process research and development
Gross carrying amount and accumulated amortization of other intangible assets
Intangible assets not subject to amortization, Gross and Net Amount		18,600
Core and developed technology
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	$ 148,891	138,340
Intangible assets subject to amortization, Accumulated Amortization	$ (47,894)	(41,782)
Customer relationships
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	$ 14,500	14,500
Intangible assets subject to amortization, Accumulated Amortization	$ (4,003)	(2,330)
Patents
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	6 years
Intangible assets subject to amortization, Gross Amount	$ 3,000	3,000
Intangible assets subject to amortization, Accumulated Amortization	$ (1,250)	(750)
Trademarks
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	10 years
Intangible assets subject to amortization, Gross Amount	$ 2,210	2,210
Intangible assets subject to amortization, Accumulated Amortization	$ (433)	$ (195)

Debt (Details) $ in Thousands	1 Months Ended	12 Months Ended
Debt (Details) $ in Thousands	Jul. 31, 2012 USD ($)	Jan. 03, 2015 USD ($)	Sep. 27, 2012 USD ($)
Term Loan Facility
Debt
Maximum borrowing capacity	$ 100,000
Percentage of principal amortization in each of the first two years	5.00%
Number of years for which the percentage of principal amortization is five percent	2 years
Percentage of principal amortization in each of the next three years	10.00%
Number of years for which the percentage of principal amortization is ten percent	3 years
Amount borrowed under the term loan facility			$ 100,000
Fixed interest rate percentage		0.764%
Combined interest rate percentage		2.514%
Term Loan Facility
2014		$ 10,000
2015		10,000
2016		67,500
Total debt		$ 87,500
Agreement
Debt
Maximum borrowing capacity	$ 230,000
Term of debt instrument	5 years
Maximum leverage ratio		2.5
Minimum fixed charge coverage ratio		1.50
Revolving Credit Facility
Debt
Maximum borrowing capacity	$ 130,000
Sublimit on letters of credit	25,000
Sublimit on swingline loan	10,000
Additional increase in borrowing capacity of the line of credit available at the entity's option	$ 50,000
Term loan facility and revolving credit facility, other than swingline loans \| LIBOR \| Low end of range
Debt
Interest rate added to the base rate (as a percent)		1.50%
Term loan facility and revolving credit facility, other than swingline loans \| LIBOR \| High end of range
Debt
Interest rate added to the base rate (as a percent)		2.50%
Term loan facility and revolving credit facility, other than swingline loans \| Federal Funds
Debt
Interest rate added to the base rate (as a percent)		0.50%
Term loan facility and revolving credit facility, other than swingline loans \| one-month LIBOR
Debt
Interest rate added to the base rate (as a percent)		1.00%
Term loan facility, revolving credit facility, swingline and other loans \| Base rate \| Low end of range
Debt
Interest rate added to the base rate (as a percent)		0.50%
Term loan facility, revolving credit facility, swingline and other loans \| Base rate \| High end of range
Debt
Interest rate added to the base rate (as a percent)		1.50%

Stockholders' Equity (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Oct. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Apr. 30, 2012	Oct. 31, 2011
Stockholders' Equity
Number of shares of common stock issued	1.1
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	$ (684)	$ (946)	$ (2,467)
Other comprehensive income (loss) before reclassifications	200	49	29
Amounts reclassified from accumulated other comprehensive loss	402	213	1,492
Other comprehensive income	602	262	1,521
Balance at end of the period	(82)	(684)	(946)
Repurchase of common stock	71,676	26,022	62,019
Unrealized Gain on Cash Flow Hedge
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	333	(428)	(1,299)
Other comprehensive income (loss) before reclassifications	(520)	397	(621)
Amounts reclassified from accumulated other comprehensive loss	402	364	1,492
Other comprehensive income	(118)	761	871
Balance at end of the period	215	333	(428)
Net Unrealized Losses on Available-For-Sale Securities
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	(1,017)	(518)	(1,168)
Other comprehensive income (loss) before reclassifications	720	(348)	650
Amounts reclassified from accumulated other comprehensive loss		(151)
Other comprehensive income	720	(499)	650
Balance at end of the period	$ (297)	$ (1,017)	$ (518)
High end of range
Program Amount authorized to repurchase				$ 100,000	$ 100,000	$ 50,000	$ 100,000	$ 50,000

Stockholders' Equity (Details 2) - USD ($) $ in Thousands	12 Months Ended
Stockholders' Equity (Details 2) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Amounts Reclassified from AOCI
Rent expense	$ (4,200)	$ (4,200)	$ (4,400)
Interest expense	(3,154)	(3,293)	(1,149)
Investment Income, Interest	1,007	853	1,338
Income before income taxes	49,040	62,027	86,348
Income tax benefit	(11,019)	(12,208)	(22,800)
Net income	38,021	49,819	63,548
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	(387)	187	(350)
Reclassification for gains included in net income		81
Net changes to cash flow hedges
Unrealized gains (losses) arising during the period	279	(214)	335
Reclassification for losses included in net income	(216)	(196)	(803)
Other comprehensive income	(324)	(142)	(818)
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(618)	(328)	(2,295)
Income tax benefit	216	115	803
Net income	(402)	(213)	(1,492)
Unrealized Gain on Cash Flow Hedge \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Rent expense			$ (2,295)
Interest expense	$ (618)	(560)
Net Unrealized Losses on Available-For-Sale Securities \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Investment Income, Interest		$ 232

Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 03, 2015 USD ($) item $ / shares shares	Dec. 28, 2013 $ / shares shares	Dec. 29, 2012 USD ($) $ / shares shares
Stock-based compensation costs
Net reduction in selling, general and administrative expense \| $			$ 1,900
MSUs
Stock-based compensation costs
Number of shares granted	76,000
Weighted-average fair value for purchase rights granted (in dollars per share) \| $ / shares	$ 60.08	$ 31.94	$ 53.25
Fair value assumptions
Cash consideration based upon achievement of specified levels of market conditions \| $	$ 0
2009 Stock Incentive Plan
Stock-based compensation costs
Number of share pools under the 2009 Plan \| item	2
Fair value assumptions
Expected volatility (as a percent)	33.00%	32.00%	32.00%
Risk-free interest rate %	0.70%	0.50%	0.40%
Expected term	2 years 9 months 18 days	2 years 10 months 24 days	2 years 10 months 24 days
2009 Stock Incentive Plan \| Low end of range
Stock-based compensation costs
Award vesting period	3 years
2009 Stock Incentive Plan \| High end of range
Stock-based compensation costs
Award vesting period	4 years
2009 Stock Incentive Plan \| Stock options
Stock-based compensation costs
Minimum exercise price as percentage of fair market value of shares on the date of grant	100.00%
Stock options granted (in shares)	0	0	0
2009 Stock Incentive Plan \| Full value awards
Stock-based compensation costs
Number of shares granted	800,000	1,100,000	800,000
2009 Stock Incentive Plan \| Full value awards \| Prior Pool
Stock-based compensation costs
Number of shares deducted for each share granted under 2009 Stock Incentive Plan	1.55
2009 Stock Incentive Plan \| MSUs
Stock-based compensation costs
Award vesting period	3 years
Number of shares granted	76,000	132,000	110,000
2009 Stock Incentive Plan \| Stock options and stock appreciation rights \| Prior Pool
Stock-based compensation costs
Number of shares deducted for each share granted under 2009 Stock Incentive Plan	1
2009 Stock Incentive Plan \| Stock options, stock appreciation rights and full value awards \| New Pool
Stock-based compensation costs
Number of shares deducted for each share granted under 2009 Stock Incentive Plan	1
2000 Stock Incentive Plan \| Low end of range
Stock-based compensation costs
Award vesting period	3 years
2000 Stock Incentive Plan \| High end of range
Stock-based compensation costs
Award vesting period	8 years
2000 Stock Incentive Plan \| Stock options \| High end of range
Stock-based compensation costs
Term of award	10 years
2009 Employee Stock Purchase Plan
Stock-based compensation costs
Minimum exercise price as percentage of fair market value of shares on the date of grant	85.00%
Maximum term of offering	24 months
Shares issued	204,000	190,000	181,000
Weighted-average fair value for purchase rights granted (in dollars per share) \| $ / shares	$ 12.17
Fair value assumptions
Expected volatility (as a percent)	28.00%	27.00%	38.00%
Risk-free interest rate %	0.20%	0.10%	0.20%
Expected term	15 months	7 months	15 months

Stock-Based Compensation (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Summary of stock-based payment and stock option values
Total unrecognized compensation costs related to awards	$ 51,200
Weighted-average period of recognition of unrecognized compensation costs	1 year 10 months 24 days
Cash received for the issuance of common stock, net of shares withheld for taxes	$ 13,300
Stock options
Stock options activity
Outstanding at the beginning of the year (in shares)	1,089
Exercised (in shares)	(444)
Cancelled or expired (in shares)	(116)
Outstanding at the end of the period (in shares)	529	1,089
Vested and expected to vest at the end of the period (in shares)	529
Exercisable at the end of the period (in shares)	529
Weighted-Average Exercise Price
Outstanding at the beginning of the year (in dollars per share)	$ 35.09
Exercised (in dollars per share)	35.67
Cancelled or expired (in dollars per share)	49.19
Outstanding at the end of the year (in dollars per share)	31.50	$ 35.09
Vested and expected to vest at the end of the period (in dollars per share)	31.50
Exercisable at the end of the period (in dollars per share)	$ 31.50
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period	1 year 7 months 10 days
Vested and expected to vest at the end of the period	1 year 7 months 10 days
Exercisable at the end of the period	1 year 7 months 10 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 8,661
Vested and expected to vest at the end of the period (in dollars)	8,661
Options exercisable at the end of the period (in dollars)	8,661
Summary of stock-based payment and stock option values
Intrinsic value of stock options exercised	$ 5,674	$ 4,198	$ 9,064
RSAs and RSUs
Summary of restricted stock awards and restricted stock units
Outstanding at the beginning the of year (in shares)	1,835
Granted (in shares)	735
Issued (in shares)	(680)
Cancelled or expired (in shares)	(109)
Outstanding at the end of the period (in shares)	1,781	1,835
Outstanding at the end of the period and expected to vest (in shares)	1,654
Weighted-Average Remaining Vesting Term
Outstanding at the end of period	1 year 7 days
Outstanding at the end of period and expected to vest	1 year 7 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 84,584
Outstanding at the end of the period and expected to vest (in dollars)	$ 78,567
Weighted-average grant date fair value
Per grant (in dollars per share)	$ 47.93	$ 43.01	$ 42.25
Summary of stock-based payment and stock option values
Intrinsic value of RSAs and RSUs that vested	$ 32,138	$ 23,649	$ 40,105
Grant date fair value of RSAs and RSUs that vested	$ 29,668	$ 24,026	$ 31,215
MSUs
Summary of restricted stock awards and restricted stock units
Outstanding at the beginning the of year (in shares)	246
Granted (in shares)	76
Cancelled or expired (in shares)	(24)
Outstanding at the end of the period (in shares)	298	246
Outstanding at the end of the period and expected to vest (in shares)	274
Weighted-Average Remaining Vesting Term
Outstanding at the end of period	1 year 2 months 5 days
Outstanding at the end of period and expected to vest	1 year 2 months 5 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 14,181
Outstanding at the end of the period and expected to vest (in dollars)	$ 13,034
Weighted-average grant date fair value
Per grant (in dollars per share)	$ 60.08	$ 31.94	$ 53.25

Stock-Based Compensation (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Stock-based compensation costs
Share based compensation cost before tax	$ 39,067	$ 30,800	$ 31,176
Income tax benefit	4,024	2,633	4,911
Share based compensation cost after tax	35,043	28,167	26,265
Total unrecognized compensation costs related to awards	51,200
Cost of revenues
Stock-based compensation costs
Share based compensation cost before tax	775	952	1,206
Research and development
Stock-based compensation costs
Share based compensation cost before tax	18,521	14,530	12,602
Selling, general and administrative
Stock-based compensation costs
Share based compensation cost before tax	$ 19,771	$ 15,318	$ 17,368

Stock-Based Compensation (Details 4) shares in Thousands	Jan. 03, 2015 shares
Stock-Based Compensation
Reserved shares of common stock for future issuance	5,151
2000 Stock Incentive Plan
Stock-Based Compensation
Reserved shares of common stock for future issuance	529
2009 Stock Incentive Plan
Stock-Based Compensation
Reserved shares of common stock for future issuance	3,740
2009 Employee Stock Purchase Plan
Stock-Based Compensation
Reserved shares of common stock for future issuance	882

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plan (Details) - USD ($) $ in Millions	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Employee Benefit Plan
Contribution made to the 401 (k) Plan	$ 3.2	$ 3.0	$ 2.9

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Commitments and Contingencies
Rent expense under operating leases	$ 4,200	$ 4,200	$ 4,400
Minimum annual future rentals
2014	4,463
2015	4,137
2016	3,398
2017	2,517
2018	1,490
Thereafter	6,398
Total minimum lease payments	$ 22,403

Related Party Transactions (Details) - Energy Micro - USD ($) $ in Millions	Oct. 17, 2013	Jul. 01, 2013	Jul. 01, 2013
Related Party Transaction
Initial consideration	$ 107.4		$ 107.4
Holdback amount related to potential indemnification claims	20.3	$ 20.3	20.3
Contingent consideration	$ 33.3	$ 33.3	$ 33.3
Mr. Forre
Related Party Transaction
Beneficial ownership percentage		32.00%	32.00%
Initial consideration		$ 35.0
Holdback amount related to potential indemnification claims		6.5	$ 6.5
Contingent consideration		$ 10.5	$ 10.5
Mr. Bogen
Related Party Transaction
Beneficial ownership percentage	2.00%
Initial consideration	$ 0.9
Holdback amount related to potential indemnification claims	0.4
Contingent consideration	0.7
Investment in acquired entity by related party prior to the acquisition	$ 0.8

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Current:
Domestic	$ 7,083	$ 4,796	$ 21,084
International	882	4,093	(3,009)
Total Current	7,965	8,889	18,075
Deferred:
Domestic	2,352	5,591	5,444
International	702	(2,272)	(719)
Total Deferred	3,054	3,319	4,725
Income tax expense	$ 11,019	$ 12,208	$ 22,800
Effective income tax rate reconciliation
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)	(3.50%)	(8.20%)	(11.80%)
Research and development tax credits (as a percent)	(8.60%)	(12.80%)	(0.50%)
Release of prior year unrecognized tax benefits (as a percent)	(2.60%)		(8.40%)
Intercompany technology license (as a percent)			11.80%
Excess officer compensation (as a percent)	2.30%	1.90%	1.00%
Change in prior period valuation allowance	(1.40%)	3.10%
Other (as a percent)	1.30%	0.70%	(0.70%)
Effective income tax rate (as a percent)	22.50%	19.70%	26.40%
Undistributed earnings of foreign subsidiaries	$ 303,100
Income before income taxes
Domestic	38,174	$ 41,849	$ 80,494
Foreign	10,866	20,178	$ 5,854
Valuation allowance related to certain state loss and research and development tax credit carryforwards	500	(600)
Release of valuation allowance due to the expiration of certain state net operating loss carryforwards	100
Reduction of valuation allowance related to an adjustment of certain acquired state net operating losses and research and development tax credit carryforwards		200
Deferred tax assets:
Net operating loss carryforwards	31,518	38,399
Research and development tax credit carryforwards	9,740	9,276
Stock-based compensation	6,353	6,757
Capitalized research and development	7,371	8,999
Deferred income on shipments to distributors	8,117	5,733
Accrued liabilities and other	6,481	8,302
Deferred tax assets	69,580	77,466
Less: Valuation allowance	(3,455)	(3,775)
Deferred tax assets, net	66,125	73,691
Deferred tax liabilities:
Acquired intangible assets	33,630	38,444
Depreciation and amortization	3,388	2,022
Prepaid expenses and other	1,517	1,889
Deferred tax liabilities	38,535	42,355
Net deferred tax assets	$ 27,590	$ 31,336

Income Taxes (Details 2) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Operating loss and tax credit carryforwards
Net deferred tax assets (Liabilities)	$ 27,590	$ 31,336
Provision for U.S. federal and state income taxes	0
Income tax benefit reflected in earnings	(11,019)	(12,208)	$ (22,800)
Singapore
Operating loss and tax credit carryforwards
Income tax benefit reflected in earnings	$ 2,000	$ (2,200)	$ (13,300)
The income tax benefit per diluted share (in dollars per share)	$ 0.05	$ 0.05	$ (0.31)
State
Operating loss and tax credit carryforwards
Operating loss carryforwards	$ 57,900
Research and development tax credit carryforwards	11,800
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember \| Federal
Operating loss and tax credit carryforwards
Operating loss carryforwards	64,900
Research and development tax credit carryforwards	2,000
Energy Micro \| Foreign
Operating loss and tax credit carryforwards
Operating loss carryforwards	$ 21,600

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 3) - USD ($) $ in Thousands	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Changes in unrecognized tax benefits
Unrecognized tax benefits, balance at the beginning of the period	$ 4,998	$ 4,364	$ 10,943
Additions based on tax positions related to current year	465	316	1,818
Additions based on tax positions related to prior years	58	318
Reductions for tax positions related to prior years	(1,592)		(8,397)
Unrecognized tax benefits, balance at the end of the period	3,929	4,998	4,364
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	4,000	4,800	4,100
Gross increases in unrecognized tax benefits		600
Reasonably possible change in unrecognized tax position end in next twelve months
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	600
High end of range
Income Taxes
Interest in the provision for income taxes recognized	100	100
Accrual for the payment of interest related to unrecognized tax positions	$ 100	$ 100	$ 0

Segment Information (Details) $ in Thousands	12 Months Ended
Segment Information (Details) $ in Thousands	Jan. 03, 2015 USD ($) segment product	Dec. 28, 2013 USD ($)	Dec. 29, 2012 USD ($)
Segment Information
Number of operating segments \| segment	1
Number of product categories \| product	3
Revenue and property and equipment, net by geographic area
Revenues	$ 620,704	$ 580,087	$ 563,294
Property and equipment, net	132,820	132,445
United States
Revenue and property and equipment, net by geographic area
Revenues	89,935	68,566	64,856
Property and equipment, net	127,928	126,263
China
Revenue and property and equipment, net by geographic area
Revenues	271,818	253,261	219,400
Taiwan
Revenue and property and equipment, net by geographic area
Revenues	57,191	55,036	64,150
South Korea
Revenue and property and equipment, net by geographic area
Revenues	12,824	21,303	57,910
Rest of world
Revenue and property and equipment, net by geographic area
Revenues	188,936	181,921	156,978
Property and equipment, net	4,892	6,182
Broad-based
Revenue and property and equipment, net by geographic area
Revenues	317,128	281,777	270,098
Broadcast
Revenue and property and equipment, net by geographic area
Revenues	204,256	199,837	186,067
Access
Revenue and property and equipment, net by geographic area
Revenues	$ 99,320	$ 98,473	$ 107,129

Subsequent Event (Details) $ in Millions	Jan. 30, 2015 USD ($)
Bluegiga \| Subsequent Event
Subsequent Event [Line Items]
Cash Consideration	$ 61

SCHEDULE II - Schedule - VALUATION AND QUALIFYING ACCOUNTS (Details) - Valuation Allowance for Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Valuation Allowance
Balance at Beginning of Period	$ 3,775	$ 2,114
Charged to Expenses		2,335
Charged to Goodwill			$ 2,114
Deductions	(320)	(674)
Balance at End of Period	$ 3,455	$ 3,775	$ 2,114