Silicon Laboratories (SLAB) 10-K31 Jan 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 28, 2013	Jan. 21, 2014	Jun. 28, 2013
Document and Entity Information	'	'	'
Entity Registrant Name	'SILICON LABORATORIES INC	'	'
Entity Central Index Key	'0001038074	'	'
Document Type	'10-K	'	'
Document Period End Date	28-Dec-13	'	'
Amendment Flag	'false	'	'
Current Fiscal Year End Date	'--12-28	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$1,639,157,249
Entity Common Stock, Shares Outstanding	'	42,826,583	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Current assets:	'	'
Cash and cash equivalents	$95,800	$105,426
Short-term investments	179,593	176,565
Accounts receivable, net of allowances for doubtful accounts of $797 at December 28, 2013 and $670 at December 29, 2012	72,124	78,023
Inventories	45,271	49,579
Deferred income taxes	18,878	16,652
Prepaid expenses and other current assets	47,651	41,437
Total current assets	459,317	467,682
Long-term investments	10,632	11,369
Property and equipment, net	132,445	135,271
Goodwill	228,781	130,265
Other intangible assets, net	131,593	90,750
Other assets, net	28,382	36,629
Total assets	991,150	871,966
Current liabilities:	'	'
Accounts payable	22,126	29,622
Current portion of long-term debt	7,500	5,000
Accrued expenses	45,975	40,410
Deferred income on shipments to distributors	30,853	30,259
Income taxes	2,693	1,087
Total current liabilities	109,147	106,378
Long-term debt	87,500	95,000
Other non-current liabilities	55,941	20,615
Total liabilities	252,588	221,993
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; 42,779 and 41,879 shares issued and outstanding at December 28, 2013 and December 29, 2012, respectively	4	4
Additional paid-in capital	48,630	10,122
Retained earnings	690,612	640,793
Accumulated other comprehensive loss	-684	-946
Total stockholders' equity	738,562	649,973
Total liabilities and stockholders' equity	$991,150	$871,966

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Consolidated Balance Sheets	'	'
Accounts receivable, allowances for doubtful accounts (in dollars)	$797	$670
Preferred stock, par value (in dollars per share)	$0.00	$0.00
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)	$0.00	$0.00
Common stock, shares authorized	250,000	250,000
Common stock, shares issued	42,779	41,879
Common stock, shares outstanding	42,779	41,879

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Consolidated Statements of Income	'	'	'
Revenues	$580,087	$563,294	$491,625
Cost of revenues	227,183	225,277	193,179
Gross margin	352,904	338,017	298,446
Operating expenses:	'	'	'
Research and development	157,799	137,952	135,953
Selling, general and administrative	130,795	114,390	112,419
Operating expenses	288,594	252,342	248,372
Operating income	64,310	85,675	50,074
Other income (expense):	'	'	'
Interest income	853	1,338	1,859
Interest expense	-3,293	-1,149	-37
Other income (expense), net	157	484	444
Income before income taxes	62,027	86,348	52,340
Provision for income taxes	12,208	22,800	16,868
Net income	$49,819	$63,548	$35,472
Earnings per share:	'	'	'
Basic (in dollars per share)	$1.17	$1.51	$0.82
Diluted (in dollars per share)	$1.14	$1.47	$0.79
Weighted-average common shares outstanding:	'	'	'
Basic (in shares)	42,715	42,136	43,421
Diluted (in shares)	43,537	43,106	44,832

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income	'	'	'
Net income	$49,819	$63,548	$35,472
Net changes to available-for-sale securities:	'	'	'
Unrealized gains (losses) arising during the period	-535	1,000	4
Reclassification for gains included in net income	-232	'	'
Net changes to cash flow hedges:	'	'	'
Unrealized gains (losses) arising during the period	611	-956	-424
Reclassification for losses included in net income	560	2,295	2,237
Other comprehensive income, before tax	404	2,339	1,817
Provision for income taxes	142	818	636
Other comprehensive income	262	1,521	1,181
Comprehensive income	$50,081	$65,069	$36,653

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Jan. 01, 2011	$625,430	$4	$49,947	$579,127	($3,648)
Balance (in shares) at Jan. 01, 2011	'	43,933	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'
Net income	35,472	'	'	35,472	'
Other comprehensive income	1,181	'	'	'	1,181
Stock issuances under employee plans, net of shares withheld for taxes	7,660	'	7,660	'	'
Stock issuances under employee plans, net of shares withheld for taxes (in shares)	'	1,290	'	'	'
Income tax benefit (detriment) from employee stock-based awards	2,707	'	2,707	'	'
Repurchases of common stock	-110,063	'	-82,117	-27,946	'
Repurchases of common stock (in shares)	-3,200	-3,155	'	'	'
Stock-based compensation	36,552	'	36,552	'	'
Balance at Dec. 31, 2011	598,939	4	14,749	586,653	-2,467
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 (detriment) from employee stock-based awards	1,675	'	1,675	'	'
Repurchases of common stock	-62,019	'	-52,611	-9,408	'
Repurchases of common stock (in shares)	-1,700	-1,749	'	'	'
Stock-based compensation	31,161	'	31,161	'	'
Balance at Dec. 29, 2012	649,973	4	10,122	640,793	-946
Balance (in shares) at Dec. 29, 2012	41,879	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 (detriment) from employee stock-based awards	-772	'	-772	'	'
Repurchases of common stock	-26,022	'	-26,022	'	'
Repurchases of common stock (in shares)	-700	-661	'	'	'
Stock-based compensation	30,753	'	30,753	'	'
Stock issued in business combination	19,248	'	19,248	'	'
Stock issued in business combination (in shares)	500	504	'	'	'
Balance at Dec. 28, 2013	$738,562	$4	$48,630	$690,612	($684)
Balance (in shares) at Dec. 28, 2013	42,779	42,779	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Operating Activities	'	'	'
Net income	$49,819	$63,548	$35,472
Adjustments to reconcile net income to cash provided by operating activities:	'	'	'
Depreciation of property and equipment	13,491	13,621	13,570
Net gain on the purchase of property and equipment	'	-8,457	'
Amortization of other intangible assets and other assets	15,911	14,154	11,030
Impairment of long-lived assets	'	708	1,322
Stock-based compensation expense	30,800	31,176	36,115
Income tax benefit (detriment) from employee stock-based awards	-606	1,827	2,814
Excess income tax benefit from employee stock-based awards	-290	-1,294	-2,404
Deferred income taxes	3,319	4,725	-445
Changes in operating assets and liabilities:	'	'	'
Accounts receivable	8,972	-20,743	-8,562
Inventories	5,588	-13,056	5,334
Prepaid expenses and other assets	-2,514	10,629	-5,948
Accounts payable	-3,979	7,217	-2,176
Accrued expenses	-3,169	-3,812	-1,320
Deferred income on shipments to distributors	-2,381	4,623	-1,915
Income taxes	5,189	-7,816	5,855
Net cash provided by operating activities	120,150	97,050	88,742
Investing Activities	'	'	'
Purchases of available-for-sale investments	-213,883	-192,450	-178,676
Proceeds from sales and maturities of available-for-sale investments	210,824	235,517	193,474
Purchases of property and equipment	-10,472	-102,043	-8,690
Purchases of other assets	-5,939	-8,508	-4,018
Acquisitions of businesses, net of cash acquired	-86,441	-71,852	-27,262
Net cash used in investing activities	-105,911	-139,336	-25,172
Financing Activities	'	'	'
Proceeds from issuance of common stock, net of shares withheld for taxes	15,301	15,148	7,660
Excess income tax benefit from employee stock-based awards	290	1,294	2,404
Repurchases of common stock	-26,022	-62,019	-110,063
Proceeds from issuance of long-term debt, net	'	98,325	'
Payments on debt	-13,434	'	-7,174
Net cash provided by (used in) financing activities	-23,865	52,748	-107,173
Increase (decrease) in cash and cash equivalents	-9,626	10,462	-43,603
Cash and cash equivalents at beginning of period	105,426	94,964	138,567
Cash and cash equivalents at end of period	95,800	105,426	94,964
Supplemental Disclosure of Cash Flow Information:	'	'	'
Interest paid	2,925	677	35
Income taxes paid	3,838	23,564	8,241
Supplemental Disclosure of Non-Cash Activity:	'	'	'
Stock issued in business combination	$19,248	'	'

Description_of_Business

Description of Business	12 Months Ended
Description of Business	Dec. 28, 2013
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_Policie

Significant Accounting Policies	12 Months Ended
Significant Accounting Policies	Dec. 28, 2013
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 2013, 2012 and 2011 were 52-week years and ended on December 28, 2013, December 29, 2012 and December 31, 2011, 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. The Company's objective is to offset increases and decreases in expenses resulting from changes in interest rates with gains and losses on the derivative contracts, thereby reducing volatility of earnings. The Company does not use derivative contracts for speculative purposes. The effective portion of the gain or loss on interest rate swaps is recorded in accumulated other comprehensive loss as a separate component of stockholders' equity and is subsequently recognized in earnings when the hedged exposure affects earnings. Cash flows from derivatives are classified according to the nature of the cash receipt or payment in the Consolidated Statement of Cash Flows.

	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 six 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 almost exclusively 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.

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 $2.0 million, $1.7 million and $1.6 million in fiscal 2013, 2012 and 2011, 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 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 February 2013, the Financial Accounting Standards Board (FASB) issued FASB Accounting Standards Update (ASU) No. 2013-02, Comprehensive Income (Topic 220)—Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. ASU 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this ASU did not have an impact on the Company's financial statements, but did amend the disclosures for accumulated other comprehensive loss.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 28, 2013
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
		December 28,		December 29,		December 31,
		2013		2012		2011
	Net income	$	49,819	$	63,548	$	35,472

	Shares used in computing basic earnings per share		42,715		42,136		43,421
	Effect of dilutive securities:
	Stock options and other stock-based awards		822		970		1,411

	Shares used in computing diluted earnings per share		43,537		43,106		44,832


	Earnings per share:
	Basic	$	1.17	$	1.51	$	0.82
	Diluted	$	1.14	$	1.47	$	0.79

	For fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, approximately 0.4 million, 0.5 million and 0.4 million shares, respectively, were not included in the diluted earnings per share calculation since the shares were anti-dilutive.

Cash_Cash_Equivalents_and_Inve

Cash, Cash Equivalents and Investments	12 Months Ended
Cash, Cash Equivalents and Investments	Dec. 28, 2013
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 December 28, 2013 consisted of municipal bonds, money market funds, variable-rate demand notes, corporate bonds, certificates of deposit, commercial paper and asset backed securities. 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 December 28, 2013, the Company held $12.4 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 $10.4 million were guaranteed by the U.S. government and the remaining $2.0 million were privately insured. As of December 28, 2013, $6.0 million had credit ratings of AA, $2.0 million had a credit rating of A and $4.4 million of the auction-rate securities had credit ratings of BBB. These securities have contractual maturity dates ranging from 2033 to 2046 at December 28, 2013. 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 December 28, 2013.

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


			December 28, 2013
			Cost			Gross			Gross			Fair Value
						Unrealized			Unrealized
						Losses			Gains
	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







			December 29, 2012
			Cost			Gross			Gross			Fair Value
						Unrealized			Unrealized
						Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand		$	56,690		$	—		$	—		$	56,690
	Available-for-sale securities:
	U.S. Treasury bills			25,049			—			1			25,050
	Money market funds			22,685			—			1			22,686
	Municipal bonds			1,000			—			—			1,000

	Total available-for-sale securities			48,734			—			2			48,736

Total cash and cash equivalents		$	105,424		$	—		$	2		$	105,426


Short-term Investments:
Available-for-sale securities:
Corporate bonds		$	59,089		$	(5	)	$	267		$	59,351
Municipal bonds			45,646			(7	)		50			45,689
Variable-rate demand notes			41,785			—			—			41,785
Asset-backed securities			15,058			—			11			15,069
U.S. government bonds			12,638			—			25			12,663
International government bonds			1,991			—			17			2,008

Total short-term investments		$	176,207		$	(12	)	$	370		$	176,565


Long-term Investments:
Available-for-sale securities:
Auction rate securities		$	12,525		$	(1,156	)	$	—		$	11,369

Total long-term investments		$	12,525		$	(1,156	)	$	—		$	11,369



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 December 28, 2013		Fair			Gross			Fair			Gross			Fair		Gross
		Value			Unrealized			Value			Unrealized			Value		Unrealized
					Losses						Losses					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	)







		Less Than 12 Months						12 Months or Greater						Total
As of December 29, 2012		Fair			Gross			Fair			Gross			Fair		Gross
		Value			Unrealized			Value			Unrealized Losses			Value		Unrealized
					Losses											Losses
Municipal bonds		$	17,152		$	(7	)	$	—		$	—		$	17,152	$	(7	)
Auction rate securities			—			—			11,369			(1,156	)		11,369		(1,156	)
Corporate bonds			9,543			(5	)		—			—			9,543		(5	)

		$	26,695		$	(12	)	$	11,369		$	(1,156	)	$	38,064	$	(1,168	)



The gross unrealized losses as of December 28, 2013 and December 29, 2012 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 December 28, 2013 (in thousands):


		Cost			Fair
		Cost			Value
Due in one year or less		$	115,109		$	115,177
Due after one year through ten years			80,987			81,147
Due after ten years			45,950			44,157

		$	242,046		$	240,481

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Dec. 28, 2013
Derivative Financial Instruments	'
Derivative Financial Instruments	'

	5. Derivative Financial Instruments

	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 derivatives 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 December 28, 2013, 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 consisted of the following (in thousands):


				Fair Value
		Balance Sheet Location		December 28,			December 29,
		Balance Sheet Location		2013			2012
	Interest rate swap	Other assets, net		$	513		$	—
		Other non-current liabilities			—			658

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


		Gain (Loss) Recognized in									Location	Loss Reclassified
		OCI on Derivatives									of Loss	from Accumulated
		(Effective Portion)									Reclassified	OCI into Income
		during the Year Ended									into Income	(Effective Portion)
												during the Year Ended
		December 28,			December 29,			December 31,				December 28,			December 29,			December 31,
		2013			2012			2011				2013			2012			2011
	Interest rate swaps	$	611		$	(956	)	$	(424	)	Rent expense	$	—		$	(2,197	)	$	(2,237	)
											Interest expense		(560	)		(98	)		—

	The Company expects to reclassify $0.5 million of its interest rate swap losses included in accumulated other comprehensive loss as of December 28, 2013 into earnings in the next 12 months, which would be offset by lower interest payments.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
Fair Value of Financial Instruments	Dec. 28, 2013
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 December 28, 2013 Using
	Description		Quoted Prices in			Significant Other			Significant			Total
			Active Markets for			Observable			Unobservable
			Identical Assets			Inputs			Inputs
			(Level 1)			(Level 2)			(Level 3)
	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


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

	Total		$	—		$	—		$	12,919		$	12,919




			Fair Value Measurements
			at December 29, 2012 Using
	Description		Quoted Prices in			Significant Other			Significant			Total
			Active Markets for			Observable			Unobservable
			Identical Assets			Inputs			Inputs
			(Level 1)			(Level 2)			(Level 3)
	Assets:
	Cash Equivalents:
	U.S. Treasury bills		$	25,050		$	—		$	—		$	25,050
	Money market funds			22,686			—			—			22,686
	Municipal bonds			—			1,000			—			1,000

	Total cash equivalents		$	47,736		$	1,000		$	—		$	48,736
	Short-term Investments:
	Corporate bonds		$	—		$	59,351		$	—		$	59,351
Municipal bonds			—			45,689			—			45,689
Variable-rate demand notes			—			41,785			—			41,785
Asset-backed securities			—			15,069			—			15,069
U.S. government bonds			12,663			—			—			12,663
International government bonds			—			2,008			—			2,008

Total short-term investments		$	12,663		$	163,902		$	—		$	176,565
Long-term Investments:
Auction rate securities		$	—		$	—		$	11,369		$	11,369

Total long-term investments		$	—		$	—		$	11,369		$	11,369

Total		$	60,399		$	164,902		$	11,369		$	236,670


Liabilities:
Derivative instruments		$	—		$	658		$	—		$	658
Contingent consideration			—			—			2,750			2,750

Total		$	—		$	658		$	2,750		$	3,408



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 a discounted cash flow model. The assumptions used in preparing the discounted cash flow model include quoted interest swap rates 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		Valuation Technique		Unobservable Input		Weighted
December 28, 2013						Average
(000s)
$10,632		Discounted cash flow		Estimated yield		1.11%
				Expected holding period		10 years
				Estimated discount rate		4.05%

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		Valuation Technique		Unobservable Input		Range
December 28, 2013
(000s)
$12,919		Monte Carlo simulation		Expected revenue growth rate		26.2% - 51.9%
				Expected revenue volatility		20.00%
				Expected term		1.0 - 5.0 years
				Estimated discount rate		0.1% - 1.6%

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 a Monte Carlo simulation model. 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. A change in discount rate would be accompanied by a directionally opposite change in fair value.

The following summarizes the activity in Level 3 financial instruments for the years ended December 28, 2013 and December 29, 2012 (in thousands):

Assets


		Year Ended
Auction Rate Securities		December 28,			December 29,
Auction Rate Securities		2013			2012
Beginning balance		$	11,369		$	17,477
Settlements			(100	)		(6,700	)
Gain (loss) included in other comprehensive income			(637	)		592

Ending balance		$	10,632		$	11,369



Liabilities


		Year Ended
Contingent Consideration (1)		December 28,			December 29,
Contingent Consideration (1)		2013			2012
Beginning balance		$	2,750		$	876
Issues			13,964			4,004
Gain recognized in earnings (2)			(3,795	)		(2,130	)

Ending balance		$	12,919		$	2,750


Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:		$	1,045		$	1,254



-1
In connection with the acquisition of Energy Micro, Ember and ChipSensors, 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 Statements of Income.

-2
The Company reduced the estimated fair value of contingent consideration because certain milestone goals were either not achieved or were expected to be achieved at a lower outcome.

Fair values of other financial instruments

The Company's Term Loan Facility bears interest at LIBOR plus an applicable margin. The fair value of the Company's Term Loan Facility approximates its carrying values as of December 28, 2013 and December 29, 2012, based on the estimated margin observed for loans to companies under similar terms and credit profiles. 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.

Balance_Sheet_Details

Balance Sheet Details	12 Months Ended
Balance Sheet Details	Dec. 28, 2013
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


			December 28,			December 29,
			2013			2012
	Work in progress		$	34,503		$	42,103
	Finished goods			10,768			7,476

			$	45,271		$	49,579



	Prepaid Expenses and Other Current Assets


			December 28,			December 29,
			2013			2012
	Distributor advances		$	31,839		$	21,260
	Other			15,812			20,177

			$	47,651		$	41,437



	Property and Equipment


			December 28,			December 29,
			2013			2012
	Buildings and improvements		$	94,221		$	90,900
	Equipment			51,071			48,219
	Computers and purchased software			25,556			27,294
	Leasehold interest in ground leases			23,840			23,840
	Furniture and fixtures			3,496			3,129
	Leasehold improvements			7,784			7,587

				205,968			200,969
	Accumulated depreciation			(73,523	)		(65,698	)

			$	132,445		$	135,271



	Accrued Expenses


			December 28,			December 29,
			2013			2012
	Accrued compensation and benefits		$	24,896		$	22,298
	Other			21,079			18,112

			$	45,975		$	40,410



	Other Non-current Liabilities


		December 28,			December 29,
		2013			2012
Acquisition-related escrow		$	20,010		$	—
Contingent consideration			12,919			—
Acquired unfavorable leases			11,268			11,794
Other			11,744			8,821

		$	55,941		$	20,615

Risks_and_Uncertainties

Risks and Uncertainties	12 Months Ended
Risks and Uncertainties	Dec. 28, 2013
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, variable-rate demand notes, corporate bonds, auction-rate securities, certificates of deposit, commercial paper and asset backed securities. 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:


		December 28,			December 29,
		2013			2012
	Edom Technology		26	%		23	%
	Arrow Electronics		10	%		**
	Avnet		**			12	%


	**
	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.

	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 its affiliates. The inability of TSMC 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 2013, 2012 or 2011. The Company's end customers and distributors that accounted for greater than 10% of revenue consisted of the following:


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	End Customers
	Samsung*		15	%		19	%		13	%
	Distributors
	Edom Technology		21	%		22	%		24	%
	Avnet		11	%		11	%		12	%
	Macnica		**			**			10	%


	*
	Samsung's purchases were across a variety of product areas.
	**
	Less than 10% of revenue

Acquisitions

Acquisitions	12 Months Ended
Acquisitions	Dec. 28, 2013
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 held in escrow by the Company as security for breaches of representations and warranties and certain other expressly enumerated matters. The escrow 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



	The allocation of the purchase price is preliminary and subject to change, based on finalization of certain income tax matters. Accordingly, adjustments may be made to the values of the assets acquired and liabilities assumed as additional information is obtained about the facts and circumstances that existed at the valuation date.

	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%. The remaining research and development efforts include additional design, integration and testing. The significant risks associated with the successful completion of this project include the Company's potential inability to finish the product designs, produce working models and gain customer acceptance.

	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. 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.

Spectra Linear

On January 25, 2011, the Company acquired Spectra Linear, Inc., a late-stage private company offering integrated timing solutions. The Company acquired Spectra Linear for approximately $28.6 million, including contingent consideration with an estimated fair value of $1.0 million at the date of acquisition. In addition, the Company assumed approximately $8.0 million of Spectra Linear net liabilities in connection with the acquisition.

The Company paid an additional approximately $4.5 million of consideration to certain Spectra Linear employees in connection with an agreement between the employees and Spectra Linear. This agreement provided that upon the sale of Spectra Linear, a portion of the proceeds would be paid to such employees as bonuses. The agreement was accounted for as a transaction separate from the business combination based on its economic substance and was recorded as post-combination compensation expense in the Company's financial statements during fiscal 2011.

The Company believes that the acquisition adds a broad family of timing ICs that will enable it to accelerate penetration in high-volume applications, 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:
Core and developed technology		$	16,560			10
Customer relationships			1,400			10

			17,960
Accounts receivable			1,759
Inventories			1,199
Other current assets			1,658
Goodwill			4,097
Deferred tax assets—non-current			12,316
Other non-current assets			597
Notes payable—current portion			(4,641	)
Current liabilities			(3,112	)
Non-current liabilities			(3,254	)

Total purchase price		$	28,579



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.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
Goodwill and Other Intangible Assets	Dec. 28, 2013
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 December 28, 2013 and December 29, 2012 (in thousands):


		Year Ended
		December 28,			December 29,
		2013			2012
	Beginning balance	$	130,265		$	115,489
	Additions due to business combinations		98,516			14,776

	Ending balance	$	228,781		$	130,265



	Other Intangible Assets

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


				December 28, 2013						December 29, 2012
		Weighted-Average
		Amortization
		Period
		(Years)		Gross			Accumulated			Gross		Accumulated
				Amount			Amortization			Amount		Amortization
	Intangible assets:
	Subject to amortization:
	Core and developed technology	9		$	138,340		$	(41,782	)	$	95,420	$	(30,145	)
	Customer relationships	9			14,500			(2,330	)		8,100		(1,057	)
	Patents	6			3,000			(750	)		3,000		(250	)
	Trademarks	10			2,210			(195	)		910		(38	)

		9			158,050			(45,057	)		107,430		(31,490	)
	Not subject to amortization:
	In-process research and development	Not amortized			18,600			—			14,810		—

	Total intangible assets			$	176,650		$	(45,057	)	$	122,240	$	(31,490	)



	Gross intangible assets increased $55.4 million in fiscal 2013 due to the acquisition of Energy Micro. This increase was offset by the removal of $1.0 million of fully amortized assets.

	Amortization expense related to intangible assets for fiscal 2013, 2012 and 2011 was $14.6 million, $10.7 million and $9.9 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
	2014	$	17,060
	2015		16,669
	2016		16,019
	2017		15,052
	2018		14,309

Debt

Debt	12 Months Ended
	Dec. 28, 2013
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 a per annum rate based on 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 December 28, 2013, the Company was in compliance with all covenants of the Credit Facilities.

	As of December 28, 2013, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):


	Fiscal Year
	2014	$	7,500
	2015		10,000
	2016		10,000
	2017		67,500

	Total	$	95,000



	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 December 28, 2013, 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

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 28, 2013
Stockholders' Equity	'
Stockholders' Equity	'

	12. Stockholders' Equity

	Common Stock

	The Company issued 1.6 million shares of common stock during fiscal 2013, including approximately 0.5 million shares issued in connection with the acquisition of Energy Micro.

	Share Repurchase Programs

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


	Program Authorization Date		Program		Program
			Termination		Amount
			Date
	Jan-14		Jan-15		$	100,000
	Jan-13		Jan-14		$	50,000
	Apr-12		Jan-13		$	100,000
	Oct-11		Apr-12		$	50,000
	Jul-10		Aug-11		$	150,000

	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 0.7 million shares, 1.7 million shares and 3.2 million shares of its common stock for $26.0 million, $62.0 million and $110.1 million during fiscal 2013, 2012 and 2011, 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			Net Unrealized			Total
			(Loss) on Cash			Losses on Available-
			Flow Hedge			For-Sale Securities
	Balance at January 1, 2011		$	(2,477	)	$	(1,171	)	$	(3,648	)
	Other comprehensive income (loss) before reclassifications			(276	)		3			(273	)
	Amount reclassified from accumulated other comprehensive loss			1,454			—			1,454

	Net change for the period			1,178			3			1,181

	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	)



	Reclassifications From Accumulated Other Comprehensive Loss


			Year ended
	Reclassification (in thousands)		December 28,			December 29,			December 31,
	Reclassification (in thousands)		2013			2012			2011
	Losses on cash flow hedges to:
	Rent expense		$	—		$	(2,295	)	$	(2,237	)
	Interest expense			(560	)		—			—
	Gains on available-for-sales securities to:
	Interest income			232			—			—

			(328	)		(2,295	)		(2,237	)
Income tax benefit			115			803			783

Total reclassifications		$	(213	)	$	(1,492	)	$	(1,454	)



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:		December 28,			December 29,			December 31,
Income tax (expense) benefit on:		2013			2012			2011
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period		$	187		$	(350	)	$	(1	)
Reclassification for gains included in net income			81			—			—
Net changes to cash flow hedges:
Unrealized gains (losses) arising during the period			(214	)		335			148
Reclassification for losses included in net income			(196	)		(803	)		(783	)

Other comprehensive income		$	(142	)	$	(818	)	$	(636	)

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
Stock-Based Compensation	Dec. 28, 2013
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"). The 2009 Plan is currently effective, and has a term of 10 years from the shareholders' approval date. The 2009 Purchase Plan became effective on April 30, 2010.

	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"). 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. 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 1.1 million, 0.8 million and 0.8 million shares of full value awards and no stock options from the 2009 Plan during fiscal 2013, 2012 and 2011, 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 2013, 2012 or 2011.

	Included in the full value awards granted under the 2009 Plan in fiscal 2013, 2012 and 2011 were a total of 132 thousand, 110 thousand and 55 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 2013, 2012 and 2011, the Company issued 190 thousand, 181 thousand and 169 thousand shares, respectively, under the 2009 Purchase Plan to its employees. The weighted-average fair value for purchase rights granted in fiscal 2013 under the 2009 Purchase Plan was $9.34 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 market-based performance awards 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
			December 28,			December 29,			December 31,
			2013			2012			2011
	2009 Employee Stock Purchase Plan:
	Expected volatility			27	%		38	%		27	%
	Risk-free interest rate %			0.1	%		0.2	%		0.2	%
	Expected term (in months)			7			15			11
	Dividend yield			—			—			—

	A summary of stock-based compensation activity with respect to fiscal 2013 follows:


	Stock Options		Shares			Weighted-			Weighted-Average			Aggregate
			(000s)			Average			Remaining			Intrinsic
						Exercise			Contractual Term			Value
						Price			(In Years)			(000s)
	Outstanding at December 29, 2012			1,696		$	35.86
	Exercised			(480	)	$	34.72
	Cancelled or expired			(127	)	$	46.87

	Outstanding at December 28, 2013			1,089		$	35.09			1.96		$	9,688
	Vested at December 28, 2013 and expected to vest			1,089		$	35.09			1.96		$	9,688
	Exercisable at December 28, 2013			1,089		$	35.09			1.96		$	9,688





RSAs, RSUs and MSUs		Shares			Weighted-			Weighted-Average			Aggregate
		(000s)			Average			Remaining			Intrinsic
					Purchase			Vesting Term			Value
					Price			(In Years)			(000s)
Outstanding at December 29, 2012			1,708		$	—
Granted			1,118		$	—
Issued			(553	)	$	—
Cancelled or expired			(192	)	$	—

Outstanding at December 28, 2013			2,081		$	—			1.25		$	88,135
Outstanding at December 28, 2013 and expected to vest			1,900		$	—			1.25		$	80,471

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


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
Per grant of RSAs, RSUs and MSUs		$	41.69		$	43.82		$	44.73

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


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
Intrinsic value of stock options exercised		$	4,198		$	9,064		$	8,622
Intrinsic value of RSAs and RSUs that vested		$	23,649		$	40,105		$	38,769
Grant date fair value of RSAs and RSUs that vested		$	24,026		$	31,215		$	29,488

The Company had approximately $51.2 million of total unrecognized compensation costs related to stock awards at December 28, 2013 that are expected to be recognized over a weighted-average period of 2.1 years. There were no significant stock-based compensation costs capitalized into assets in any of the periods presented.

The Company received cash of $15.3 million for the issuance of common stock, net of shares withheld for taxes, during fiscal 2013. 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
		December 28,			December 29,			December 31,
		2013			2012			2011
Cost of revenues		$	952		$	1,206		$	1,319
Research and development			14,530			12,602			14,872
Selling, general and administrative			15,318			17,368			19,924

			30,800			31,176			36,115
Income tax benefit			2,633			4,911			3,957

		$	28,167		$	26,265		$	32,158



As of December 28, 2013, the Company had reserved shares of common stock for future issuance as follows (in thousands):


2000 Stock Incentive Plan			1,092
2009 Stock Incentive Plan			4,913
2009 Employee Stock Purchase Plan			636

Total shares reserved			6,641

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 28, 2013
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 $3.0 million, $2.9 million and $2.7 million to the 401(k) Plan during fiscal 2013, 2012 and 2011, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2013
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 2022. 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, $4.4 million and $4.5 million for fiscal 2013, 2012 and 2011, respectively. The minimum annual future rentals under the terms of these leases as of December 28, 2013 are as follows (in thousands):


	Fiscal Year
	2014	$	4,232
	2015		3,704
	2016		3,058
	2017		2,350
	2018		1,449
	Thereafter		682

	Total minimum lease payments	$	15,475



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

	In 2012, MaxLinear, Inc., a Delaware corporation, and the Company engaged one another in three patent infringement lawsuits filed in the United States District Court for the Southern District of California, San Diego Division, and in the United States District Court for the Western District of Texas, Austin Division. The Texas Court determined that the dispute concerning MaxLinear's patents would proceed in the California Court. On May 16, 2013, MaxLinear filed an additional patent infringement lawsuit against the Company in the United States District Court for the Southern District of California. On October 3, 2013, the Company and MaxLinear executed a Settlement Agreement resolving all of the lawsuits between them. MaxLinear granted the Company a license to its patent portfolio for the accused Company products, and the Company granted MaxLinear a license to its patent portfolio for the accused MaxLinear products. As part of the settlement, MaxLinear made a one-time payment of $1.25 million to the Company. The Company and MaxLinear also entered into a 3-year covenant not to sue and agreed to dismiss all of the pending cases.

	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

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 28, 2013
Related Party Transactions	'
Related Party Transactions	'

	16. Related Party Transactions

	On March 26, 2013, the Company entered into an agreement to purchase consulting services in connection with the acquisition of Energy Micro. The fees for such services were $1.5 million during fiscal 2013. Mr. Bock, the Company's President, is also an independent contractor with the consulting entity. Mr. Bock is not providing consulting services to the Company on behalf of the entity. Mr. Bock and the entity have agreed that Mr. Bock will receive no compensation in conjunction with the agreement. Mr. Bock abstained from the negotiations with respect to the agreement between the Company and the entity.

	On July 1, 2013, Geir Førre joined the Company as senior vice president and general manager of microcontroller products. 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.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 28, 2013
Income Taxes	'
Income Taxes	'

	17. Income Taxes

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


			Year Ended
			December 28,			December 29,			December 31,
			2013			2012			2011
	Current:
	Domestic		$	4,796		$	21,084		$	14,468
	International			4,093			(3,009	)		2,845

	Total Current			8,889			18,075			17,313
	Deferred:
	Domestic			5,591			5,444			(70	)
	International			(2,272	)		(719	)		(375	)

	Total Deferred			3,319			4,725			(445	)

			$	12,208		$	22,800		$	16,868



	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
			December 28,			December 29,			December 31,
			2013			2012			2011
	Federal statutory rate			35	%		35	%		35	%
	Foreign tax rate benefit			(8.2	)		(11.8	)		(11.0	)
	Research and development tax credits			(14.6	)		(0.5	)		(8.5	)
	Release of prior year unrecognized tax benefits			—			(8.4	)		—
	Intercompany technology license			—			11.8			10.4
	Excess officer compensation			1.9			1			3.2
	Valuation allowance			3.8			—			—
	Nondeductible acquisition costs			0.2			0.1			2.9
	Other			1.6			(0.8	)		0.2

				19.7	%		26.4	%		32.2	%



	The effective tax rate for fiscal 2013 decreased from the prior period, primarily due to the prior period tax charge related to the intercompany license of certain technology associated with the acquisition of Ember during 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 the prior period of unrecognized tax benefits that were determined to be effectively settled during 2012.

	The effective tax rate for fiscal 2012 decreased from the prior period, primarily due to the release of prior year unrecognized tax benefits that were determined to be effectively settled during fiscal 2012, along with one-time nondeductible costs associated with the acquisition of Spectra Linear in fiscal 2011. The impact of these items was partially offset by the non-renewal of the federal research and development tax credit in fiscal 2012.

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


			Year Ended
			December 28,			December 29,			December 31,
			2013			2012			2011
	Domestic		$	41,849		$	80,494		$	48,282
	Foreign			20,178			5,854			4,058

			$	62,027		$	86,348		$	52,340



	Foreign income before income taxes increased from fiscal 2012 to fiscal 2013 predominantly due to intercompany technology license payments made by a foreign subsidiary in 2012. Foreign income before income taxes increased from fiscal 2011 to fiscal 2012 predominantly due to increases in product sales, offset in part by an increase in the intercompany technology license payments made by a foreign subsidiary.

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 valuation allowance of $1.7 million in fiscal 2013 related to certain state loss and research and development tax credit carryforwards. This figure is net of a valuation allowance release of $0.4 million, which was due to the expiration of certain state net operating loss carryforwards, and a reduction of $0.2 million related to an adjustment of certain acquired state net operating losses and research and development tax credit carryforwards which were fully valued, both of which were offset by changes in deferred tax assets rather than a charge to income tax expense. The Company has determined that it is more likely than not that a portion of the 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. No valuation allowance was recorded against other deferred tax assets for fiscal 2013 or 2012. 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 December 28, 2013 and December 29, 2012 are as follows (in thousands):


		December 28,			December 29,
		2013			2012
Deferred tax assets:
Net operating loss carryforwards		$	38,399		$	35,847
Research and development tax credit carryforwards			9,276			8,447
Stock-based compensation			6,757			8,133
Capitalized research and development			8,999			9,708
Deferred income on shipments to distributors			5,733			3,933
Accrued liabilities and other			8,302			7,503

			77,466			73,571
Less: Valuation allowance			(3,775	)		(2,114	)

			73,691			71,457
Deferred tax liabilities:
Acquired intangibles			38,444			28,653
Depreciation and amortization			2,022			1,076
Prepaid expenses and other			1,889			1,447

			42,355			31,176

Net deferred tax assets		$	31,336		$	40,281



During fiscal 2013, the Company recorded a net deferred tax liability of approximately $5.3 million related to the acquisition of Energy Micro due to differences between book and tax bases of acquired assets and assumed liabilities.

As of December 28, 2013, the Company had federal net operating loss and research and development credit carryforwards of approximately $77.5 million and $2.1 million, respectively, as a result of the Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember acquisitions. These carryforwards expire in fiscal years 2019 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 December 28, 2013, the Company had foreign net operating loss carryforwards of approximately $29.6 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 credit carryforwards of approximately $63.9 million and $11.0 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 2013 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 2013, undistributed earnings of the Company's foreign subsidiaries of approximately $292.3 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 $2.2 million (representing $0.05 per diluted share) in fiscal 2013, approximately $(13.3) million (representing $(0.31) per diluted share) in fiscal 2012 and approximately $2.5 million (representing $0.06 per diluted share) in fiscal 2011. The impact of the reduced Singapore tax rate in fiscal 2012 reflects the recognition of prior year unrecognized tax benefits.

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


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
Beginning balance		$	4,364		$	10,943		$	10,789
Additions based on tax positions related to current year			316			1,818			757
Additions based on tax positions related to prior years			318			—			—
Reductions for tax positions related to prior years			—			(8,397	)		(603	)

Ending balance		$	4,998		$	4,364		$	10,943



As of December 28, 2013, December 29, 2012 and December 31, 2011, the Company had gross unrecognized tax benefits of $5.0 million, $4.4 million and $10.9 million, respectively, of which $4.8 million, $4.1 million and $9.9 million, respectively, would affect the effective tax rate if recognized. 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 fiscal 2013. The Company did not recognize interest in the provision of income taxes in fiscal 2012 and 2011. 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 fiscal 2013, with no such accrual at the end of fiscal 2012 and 2011.

The Company believes it is reasonably possible that the gross unrecognized tax benefits will decrease by approximately $1.5 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 2006 through 2013 remain open to examination by the major taxing jurisdictions to which the Company is subject. The examination of the Company's 2009 through 2011 federal income tax returns by the U.S. Internal Revenue Service was completed during the third quarter of 2013 with no material impact on the Company's financial statements. The Company is not currently under audit in any other major taxing jurisdiction.

Segment_Information

Segment Information	12 Months Ended
Segment Information	Dec. 28, 2013
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
		December 28,		December 29,		December 31,
		2013		2012		2011
	Broad-based	$	281,777	$	270,098	$	208,697
	Broadcast		199,837		186,067		169,548
	Access		98,473		107,129		113,380

	Revenues	$	580,087	$	563,294	$	491,625



	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
		December 28,		December 29,		December 31,
		2013		2012		2011
	United States	$	68,566	$	64,856	$	67,432
	China		253,261		219,400		152,533
	Taiwan		55,036		64,150		59,208
	Japan		32,557		31,315		50,270
	South Korea		21,303		57,910		70,252
	Rest of world		149,364		125,663		91,930

	Total	$	580,087	$	563,294	$	491,625



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


		December 28,		December 29,
		2013		2012
	United States	$	126,263	$	127,716
	Rest of world		6,182		7,555

	Total	$	132,445	$	135,271

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 28, 2013
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	'
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	'

	SILICON LABORATORIES INC.
	VALUATION AND QUALIFYING ACCOUNTS


				Additions
	Valuation Allowance for	Balance at		Charged to		Charged to		Deductions (1)			Balance at
	Deferred Tax Assets	Beginning of		Expenses		Goodwill					End of Period
		Period
						(in thousands)
	Year ended December 28, 2013	$	2,114	$	2,335	$	—	$	(674	)	$	3,775
	Year ended December 29, 2012	$	—	$	—	$	2,114	$	—		$	2,114


	-1
	Represents adjustments to deferred tax assets

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 28, 2013
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. The Company's objective is to offset increases and decreases in expenses resulting from changes in interest rates with gains and losses on the derivative contracts, thereby reducing volatility of earnings. The Company does not use derivative contracts for speculative purposes. The effective portion of the gain or loss on interest rate swaps is recorded in accumulated other comprehensive loss as a separate component of stockholders' equity and is subsequently recognized in earnings when the hedged exposure affects earnings. Cash flows from derivatives are classified according to the nature of the cash receipt or payment in the Consolidated Statement of Cash Flows.

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 six 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 almost exclusively 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.

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 $2.0 million, $1.7 million and $1.6 million in fiscal 2013, 2012 and 2011, 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 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.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
Earnings Per Share (Tables)	Dec. 28, 2013
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
		December 28,		December 29,		December 31,
		2013		2012		2011
	Net income	$	49,819	$	63,548	$	35,472

	Shares used in computing basic earnings per share		42,715		42,136		43,421
	Effect of dilutive securities:
	Stock options and other stock-based awards		822		970		1,411

	Shares used in computing diluted earnings per share		43,537		43,106		44,832


	Earnings per share:
	Basic	$	1.17	$	1.51	$	0.82
	Diluted	$	1.14	$	1.47	$	0.79

Cash_Cash_Equivalents_and_Inve1

Cash, Cash Equivalents and Investments (Tables)	12 Months Ended
Cash, Cash Equivalents and Investments (Tables)	Dec. 28, 2013
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):


			December 28, 2013
			Cost			Gross			Gross			Fair Value
						Unrealized			Unrealized
						Losses			Gains
	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






			December 29, 2012
			Cost			Gross			Gross			Fair Value
						Unrealized			Unrealized
						Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand		$	56,690		$	—		$	—		$	56,690
	Available-for-sale securities:
	U.S. Treasury bills			25,049			—			1			25,050
	Money market funds			22,685			—			1			22,686
	Municipal bonds			1,000			—			—			1,000

	Total available-for-sale securities			48,734			—			2			48,736

	Total cash and cash equivalents		$	105,424		$	—		$	2		$	105,426


	Short-term Investments:
	Available-for-sale securities:
	Corporate bonds		$	59,089		$	(5	)	$	267		$	59,351
	Municipal bonds			45,646			(7	)		50			45,689
Variable-rate demand notes			41,785			—			—			41,785
Asset-backed securities			15,058			—			11			15,069
U.S. government bonds			12,638			—			25			12,663
International government bonds			1,991			—			17			2,008

Total short-term investments		$	176,207		$	(12	)	$	370		$	176,565


Long-term Investments:
Available-for-sale securities:
Auction rate securities		$	12,525		$	(1,156	)	$	—		$	11,369

Total long-term investments		$	12,525		$	(1,156	)	$	—		$	11,369





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

	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 December 28, 2013		Fair			Gross			Fair			Gross			Fair		Gross
			Value			Unrealized			Value			Unrealized			Value		Unrealized
						Losses						Losses					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	)






			Less Than 12 Months						12 Months or Greater						Total
	As of December 29, 2012		Fair			Gross			Fair			Gross			Fair		Gross
			Value			Unrealized			Value			Unrealized Losses			Value		Unrealized
						Losses											Losses
	Municipal bonds		$	17,152		$	(7	)	$	—		$	—		$	17,152	$	(7	)
	Auction rate securities			—			—			11,369			(1,156	)		11,369		(1,156	)
	Corporate bonds			9,543			(5	)		—			—			9,543		(5	)

			$	26,695		$	(12	)	$	11,369		$	(1,156	)	$	38,064	$	(1,168	)





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 December 28, 2013 (in thousands):


			Cost			Fair
			Cost			Value
	Due in one year or less		$	115,109		$	115,177
	Due after one year through ten years			80,987			81,147
	Due after ten years			45,950			44,157

			$	242,046		$	240,481

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 28, 2013
Derivative Financial Instruments	'
Schedule of derivative financial instrument	'

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


				Fair Value
		Balance Sheet Location		December 28,			December 29,
		Balance Sheet Location		2013			2012
	Interest rate swap	Other assets, net		$	513		$	—
		Other non-current liabilities			—			658



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									Location	Loss Reclassified
		OCI on Derivatives									of Loss	from Accumulated
		(Effective Portion)									Reclassified	OCI into Income
		during the Year Ended									into Income	(Effective Portion)
												during the Year Ended
		December 28,			December 29,			December 31,				December 28,			December 29,			December 31,
		2013			2012			2011				2013			2012			2011
	Interest rate swaps	$	611		$	(956	)	$	(424	)	Rent expense	$	—		$	(2,197	)	$	(2,237	)
											Interest expense		(560	)		(98	)		—

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
Fair Value of Financial Instruments (Tables)	Dec. 28, 2013
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 December 28, 2013 Using
	Description		Quoted Prices in			Significant Other			Significant			Total
			Active Markets for			Observable			Unobservable
			Identical Assets			Inputs			Inputs
			(Level 1)			(Level 2)			(Level 3)
	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


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

	Total		$	—		$	—		$	12,919		$	12,919




			Fair Value Measurements
			at December 29, 2012 Using
	Description		Quoted Prices in			Significant Other			Significant			Total
			Active Markets for			Observable			Unobservable
			Identical Assets			Inputs			Inputs
			(Level 1)			(Level 2)			(Level 3)
	Assets:
	Cash Equivalents:
	U.S. Treasury bills		$	25,050		$	—		$	—		$	25,050
	Money market funds			22,686			—			—			22,686
	Municipal bonds			—			1,000			—			1,000

	Total cash equivalents		$	47,736		$	1,000		$	—		$	48,736
	Short-term Investments:
	Corporate bonds		$	—		$	59,351		$	—		$	59,351
	Municipal bonds			—			45,689			—			45,689
	Variable-rate demand notes			—			41,785			—			41,785
Asset-backed securities			—			15,069			—			15,069
U.S. government bonds			12,663			—			—			12,663
International government bonds			—			2,008			—			2,008

Total short-term investments		$	12,663		$	163,902		$	—		$	176,565
Long-term Investments:
Auction rate securities		$	—		$	—		$	11,369		$	11,369

Total long-term investments		$	—		$	—		$	11,369		$	11,369

Total		$	60,399		$	164,902		$	11,369		$	236,670


Liabilities:
Derivative instruments		$	—		$	658		$	—		$	658
Contingent consideration			—			—			2,750			2,750

Total		$	—		$	658		$	2,750		$	3,408





Summary of quantitative information about level 3 asset fair value measurements	'






	Fair Value at		Valuation Technique		Unobservable Input		Weighted
	December 28, 2013						Average
	(000s)
	$10,632		Discounted cash flow		Estimated yield		1.11%
					Expected holding period		10 years
					Estimated discount rate		4.05%



Summary of quantitative information about level 3 liability fair value measurements	'






	Fair Value at		Valuation Technique		Unobservable Input		Range
	December 28, 2013
	(000s)
	$12,919		Monte Carlo simulation		Expected revenue growth rate		26.2% - 51.9%
					Expected revenue volatility		20.00%
					Expected term		1.0 - 5.0 years
					Estimated discount rate		0.1% - 1.6%



Summary of activity in Level 3 financial instruments	'

	The following summarizes the activity in Level 3 financial instruments for the years ended December 28, 2013 and December 29, 2012 (in thousands):

	Assets


			Year Ended
	Auction Rate Securities		December 28,			December 29,
	Auction Rate Securities		2013			2012
	Beginning balance		$	11,369		$	17,477
	Settlements			(100	)		(6,700	)
	Gain (loss) included in other comprehensive income			(637	)		592

	Ending balance		$	10,632		$	11,369



	Liabilities


			Year Ended
	Contingent Consideration (1)		December 28,			December 29,
	Contingent Consideration (1)		2013			2012
	Beginning balance		$	2,750		$	876
	Issues			13,964			4,004
	Gain recognized in earnings (2)			(3,795	)		(2,130	)

	Ending balance		$	12,919		$	2,750


	Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:		$	1,045		$	1,254



	-1
	In connection with the acquisition of Energy Micro, Ember and ChipSensors, 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 Statements of Income.

	-2
	The Company reduced the estimated fair value of contingent consideration because certain milestone goals were either not achieved or were expected to be achieved at a lower outcome.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	12 Months Ended
Balance Sheet Details (Tables)	Dec. 28, 2013
Balance Sheet Details	'
Inventories	'

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

	Inventories


		December 28,			December 29,
		2013			2012
	Work in progress	$	34,503		$	42,103
	Finished goods		10,768			7,476

		$	45,271		$	49,579





Prepaid Expenses and Other Current Assets	'

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

	Prepaid Expenses and Other Current Assets


		December 28,			December 29,
		2013			2012
	Distributor advances	$	31,839		$	21,260
	Other		15,812			20,177

		$	47,651		$	41,437





Property and Equipment	'

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

	Property and Equipment


		December 28,			December 29,
		2013			2012
	Buildings and improvements	$	94,221		$	90,900
	Equipment		51,071			48,219
	Computers and purchased software		25,556			27,294
	Leasehold interest in ground leases		23,840			23,840
	Furniture and fixtures		3,496			3,129
	Leasehold improvements		7,784			7,587

			205,968			200,969
	Accumulated depreciation		(73,523	)		(65,698	)

		$	132,445		$	135,271





Accrued Expenses	'

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

	Accrued Expenses


		December 28,			December 29,
		2013			2012
	Accrued compensation and benefits	$	24,896		$	22,298
	Other		21,079			18,112

		$	45,975		$	40,410





Other Non-current Liabilities	'

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

	Other Non-current Liabilities


		December 28,			December 29,
		2013			2012
	Acquisition-related escrow	$	20,010		$	—
	Contingent consideration		12,919			—
	Acquired unfavorable leases		11,268			11,794
	Other		11,744			8,821

		$	55,941		$	20,615

Risks_and_Uncertainties_Tables

Risks and Uncertainties (Tables) (Customers)	12 Months Ended
Risks and Uncertainties (Tables) (Customers)	Dec. 28, 2013
Accounts receivable	'
Risks and uncertainties	'
Schedule of concentration risk	'






		December 28,			December 29,
		2013			2012
	Edom Technology		26	%		23	%
	Arrow Electronics		10	%		**
	Avnet		**			12	%


	**
	Less than 10% of accounts receivable



Revenue	'
Risks and uncertainties	'
Schedule of concentration risk	'






		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	End Customers
	Samsung*		15	%		19	%		13	%
	Distributors
	Edom Technology		21	%		22	%		24	%
	Avnet		11	%		11	%		12	%
	Macnica		**			**			10	%


	*
	Samsung's purchases were across a variety of product areas.
	**
	Less than 10% of revenue

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
Acquisitions (Tables)	Dec. 28, 2013
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





Spectra Linear	'
Business acquisition	'
Schedule of purchase price allocation	'

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


		Amount			Weighted-Average
					Amortization Period
					(Years)
	Intangible assets:
	Core and developed technology	$	16,560			10
	Customer relationships		1,400			10

			17,960
	Accounts receivable		1,759
	Inventories		1,199
	Other current assets		1,658
	Goodwill		4,097
	Deferred tax assets—non-current		12,316
	Other non-current assets		597
	Notes payable—current portion		(4,641	)
	Current liabilities		(3,112	)
	Non-current liabilities		(3,254	)

	Total purchase price	$	28,579

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
Goodwill and Other Intangible Assets (Tables)	Dec. 28, 2013
Goodwill and Other Intangible Assets	'
Summary of goodwill activity	'

	The following summarizes the activity in goodwill for the years ended December 28, 2013 and December 29, 2012 (in thousands):


		Year Ended
		December 28,			December 29,
		2013			2012
	Beginning balance	$	130,265		$	115,489
	Additions due to business combinations		98,516			14,776

	Ending balance	$	228,781		$	130,265


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):


				December 28, 2013						December 29, 2012
		Weighted-Average
		Amortization
		Period
		(Years)		Gross			Accumulated			Gross		Accumulated
				Amount			Amortization			Amount		Amortization
	Intangible assets:
	Subject to amortization:
	Core and developed technology	9		$	138,340		$	(41,782	)	$	95,420	$	(30,145	)
	Customer relationships	9			14,500			(2,330	)		8,100		(1,057	)
	Patents	6			3,000			(750	)		3,000		(250	)
	Trademarks	10			2,210			(195	)		910		(38	)

		9			158,050			(45,057	)		107,430		(31,490	)
	Not subject to amortization:
	In-process research and development	Not amortized			18,600			—			14,810		—

	Total intangible assets			$	176,650		$	(45,057	)	$	122,240	$	(31,490	)





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
	2014	$	17,060
	2015		16,669
	2016		16,019
	2017		15,052
	2018		14,309

Debt_Tables

Debt (Tables)	12 Months Ended
Debt (Tables)	Dec. 28, 2013
Debt	'
Schedule of remaining contractual maturities of the Term Loan Facility	'

	As of December 28, 2013, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):


	Fiscal Year
	2014	$	7,500
	2015		10,000
	2016		10,000
	2017		67,500

	Total	$	95,000

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
Stockholders' Equity (Tables)	Dec. 28, 2013
Stockholders' Equity	'
Schedule of share repurchase programs	'

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


	Program Authorization Date	Program		Program
		Termination		Amount
		Date
	Jan-14	Jan-15		$	100,000
	Jan-13	Jan-14		$	50,000
	Apr-12	Jan-13		$	100,000
	Oct-11	Apr-12		$	50,000
	Jul-10	Aug-11		$	150,000



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			Net Unrealized			Total
		(Loss) on Cash			Losses on Available-
		Flow Hedge			For-Sale Securities
	Balance at January 1, 2011	$	(2,477	)	$	(1,171	)	$	(3,648	)
	Other comprehensive income (loss) before reclassifications		(276	)		3			(273	)
	Amount reclassified from accumulated other comprehensive loss		1,454			—			1,454

	Net change for the period		1,178			3			1,181

	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	)


Schedule of Reclassifications From Accumulated Other Comprehensive Loss	'






		Year ended
	Reclassification (in thousands)	December 28,			December 29,			December 31,
	Reclassification (in thousands)	2013			2012			2011
	Losses on cash flow hedges to:
	Rent expense	$	—		$	(2,295	)	$	(2,237	)
	Interest expense		(560	)		—			—
	Gains on available-for-sales securities to:
	Interest income		232			—			—

			(328	)		(2,295	)		(2,237	)
	Income tax benefit		115			803			783

	Total reclassifications	$	(213	)	$	(1,492	)	$	(1,454	)


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:	December 28,			December 29,			December 31,
	Income tax (expense) benefit on:	2013			2012			2011
	Net changes to available-for-sale securities:
	Unrealized gains (losses) arising during the period	$	187		$	(350	)	$	(1	)
	Reclassification for gains included in net income		81			—			—
	Net changes to cash flow hedges:
	Unrealized gains (losses) arising during the period		(214	)		335			148
	Reclassification for losses included in net income		(196	)		(803	)		(783	)

	Other comprehensive income	$	(142	)	$	(818	)	$	(636	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
Stock-Based Compensation (Tables)	Dec. 28, 2013
Stock-Based Compensation	'
Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model	'






		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	2009 Employee Stock Purchase Plan:
	Expected volatility		27	%		38	%		27	%
	Risk-free interest rate %		0.1	%		0.2	%		0.2	%
	Expected term (in months)		7			15			11
	Dividend yield		—			—			—



Summary of Stock Options activity	'






	Stock Options	Shares			Weighted-			Weighted-Average			Aggregate
		(000s)			Average			Remaining			Intrinsic
					Exercise			Contractual Term			Value
					Price			(In Years)			(000s)
	Outstanding at December 29, 2012		1,696		$	35.86
	Exercised		(480	)	$	34.72
	Cancelled or expired		(127	)	$	46.87

	Outstanding at December 28, 2013		1,089		$	35.09			1.96		$	9,688
	Vested at December 28, 2013 and expected to vest		1,089		$	35.09			1.96		$	9,688
	Exercisable at December 28, 2013		1,089		$	35.09			1.96		$	9,688
Summary of RSAs, RSUs and MSUs Activity	'





	RSAs, RSUs and MSUs	Shares			Weighted-			Weighted-Average			Aggregate
		(000s)			Average			Remaining			Intrinsic
					Purchase			Vesting Term			Value
					Price			(In Years)			(000s)
	Outstanding at December 29, 2012		1,708		$	—
	Granted		1,118		$	—
	Issued		(553	)	$	—
	Cancelled or expired		(192	)	$	—

	Outstanding at December 28, 2013		2,081		$	—			1.25		$	88,135
	Outstanding at December 28, 2013 and expected to vest		1,900		$	—			1.25		$	80,471



Summary of weighted average fair value at the date of grant	'






		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	Per grant of RSAs, RSUs and MSUs	$	41.69		$	43.82		$	44.73



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
		December 28,			December 29,			December 31,
		2013			2012			2011
	Intrinsic value of stock options exercised	$	4,198		$	9,064		$	8,622
	Intrinsic value of RSAs and RSUs that vested	$	23,649		$	40,105		$	38,769
	Grant date fair value of RSAs and RSUs that vested	$	24,026		$	31,215		$	29,488



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
		December 28,			December 29,			December 31,
		2013			2012			2011
	Cost of revenues	$	952		$	1,206		$	1,319
	Research and development		14,530			12,602			14,872
	Selling, general and administrative		15,318			17,368			19,924

			30,800			31,176			36,115
	Income tax benefit		2,633			4,911			3,957

		$	28,167		$	26,265		$	32,158





Summary of shares reserved of common stock for future issuance	'

	As of December 28, 2013, the Company had reserved shares of common stock for future issuance as follows (in thousands):


	2000 Stock Incentive Plan		1,092
	2009 Stock Incentive Plan		4,913
	2009 Employee Stock Purchase Plan		636

	Total shares reserved		6,641

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 28, 2013
Commitments and Contingencies	'
Schedule of minimum annual future rentals	'

	The minimum annual future rentals under the terms of these leases as of December 28, 2013 are as follows (in thousands):


	Fiscal Year
	2014	$	4,232
	2015		3,704
	2016		3,058
	2017		2,350
	2018		1,449
	Thereafter		682

	Total minimum lease payments	$	15,475

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 28, 2013
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
		December 28,			December 29,			December 31,
		2013			2012			2011
	Current:
	Domestic	$	4,796		$	21,084		$	14,468
	International		4,093			(3,009	)		2,845

	Total Current		8,889			18,075			17,313
	Deferred:
	Domestic		5,591			5,444			(70	)
	International		(2,272	)		(719	)		(375	)

	Total Deferred		3,319			4,725			(445	)

		$	12,208		$	22,800		$	16,868





Summary of effective income tax rate reconciliation	'






		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	Federal statutory rate		35	%		35	%		35	%
	Foreign tax rate benefit		(8.2	)		(11.8	)		(11.0	)
	Research and development tax credits		(14.6	)		(0.5	)		(8.5	)
	Release of prior year unrecognized tax benefits		—			(8.4	)		—
	Intercompany technology license		—			11.8			10.4
	Excess officer compensation		1.9			1			3.2
	Valuation allowance		3.8			—			—
	Nondeductible acquisition costs		0.2			0.1			2.9
	Other		1.6			(0.8	)		0.2

			19.7	%		26.4	%		32.2	%





Schedule of components of income before income taxes	'

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


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	Domestic	$	41,849		$	80,494		$	48,282
	Foreign		20,178			5,854			4,058

		$	62,027		$	86,348		$	52,340





Significant components of the Company's deferred taxes	'

	Significant components of the Company's deferred taxes as of December 28, 2013 and December 29, 2012 are as follows (in thousands):


		December 28,			December 29,
		2013			2012
	Deferred tax assets:
	Net operating loss carryforwards	$	38,399		$	35,847
	Research and development tax credit carryforwards		9,276			8,447
	Stock-based compensation		6,757			8,133
	Capitalized research and development		8,999			9,708
	Deferred income on shipments to distributors		5,733			3,933
	Accrued liabilities and other		8,302			7,503

			77,466			73,571
	Less: Valuation allowance		(3,775	)		(2,114	)

			73,691			71,457
	Deferred tax liabilities:
	Acquired intangibles		38,444			28,653
	Depreciation and amortization		2,022			1,076
	Prepaid expenses and other		1,889			1,447

			42,355			31,176

	Net deferred tax assets	$	31,336		$	40,281





Schedule of changes in the unrecognized tax benefits	'

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


		Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	Beginning balance	$	4,364		$	10,943		$	10,789
	Additions based on tax positions related to current year		316			1,818			757
	Additions based on tax positions related to prior years		318			—			—
	Reductions for tax positions related to prior years		—			(8,397	)		(603	)

	Ending balance	$	4,998		$	4,364		$	10,943

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 28, 2013
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
		December 28,		December 29,		December 31,
		2013		2012		2011
	Broad-based	$	281,777	$	270,098	$	208,697
	Broadcast		199,837		186,067		169,548
	Access		98,473		107,129		113,380

	Revenues	$	580,087	$	563,294	$	491,625





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
		December 28,		December 29,		December 31,
		2013		2012		2011
	United States	$	68,566	$	64,856	$	67,432
	China		253,261		219,400		152,533
	Taiwan		55,036		64,150		59,208
	Japan		32,557		31,315		50,270
	South Korea		21,303		57,910		70,252
	Rest of world		149,364		125,663		91,930

	Total	$	580,087	$	563,294	$	491,625





Schedule of property and equipment, net by geographic area	'

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


		December 28,		December 29,
		2013		2012
	United States	$	126,263	$	127,716
	Rest of world		6,182		7,555

	Total	$	132,445	$	135,271

Significant_Accounting_Policie2

Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Basis of Presentation and Principles of Consolidation	'	'	'
Length of fiscal year	'364 days	'364 days	'364 days
Advertising	'	'	'
Advertising expenses	$2	$1.70	$1.60
Buildings	'	'	'
Property and Equipment	'	'	'
Useful life	'	'40 years	'
Leasehold interest in ground leases	'	'	'
Property and Equipment	'	'	'
Useful life	'	'86 years	'
Minimum	'	'	'
Basis of Presentation and Principles of Consolidation	'	'	'
Length of fiscal year	'364 days	'364 days	'364 days
Property and Equipment	'	'	'
Useful life	'3 years	'	'
Long-Lived Assets	'	'	'
Useful live of purchased intangible assets	'6 years	'	'
Maximum	'	'	'
Basis of Presentation and Principles of Consolidation	'	'	'
Length of fiscal year	'371 days	'371 days	'371 days
Property and Equipment	'	'	'
Useful life	'7 years	'	'
Long-Lived Assets	'	'	'
Useful live of purchased intangible assets	'12 years	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Earnings Per Share	'	'	'
Net income	$49,819	$63,548	$35,472
Shares used in computing basic earnings per share	42,715,000	42,136,000	43,421,000
Effect of dilutive securities:	'	'	'
Stock options and other stock-based awards (in shares)	822,000	970,000	1,411,000
Shares used in computing diluted earnings per share	43,537,000	43,106,000	44,832,000
Earnings per share:	'	'	'
Basic (in dollars per share)	$1.17	$1.51	$0.82
Diluted (in dollars per share)	$1.14	$1.47	$0.79
Shares excluded from computation of diluted earning per share	400,000	500,000	400,000

Cash_Cash_Equivalents_and_Inve2

Cash, Cash Equivalents and Investments (Details) (USD $)	12 Months Ended
Cash, Cash Equivalents and Investments (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
Cash, Cash Equivalents and Investments	'	'
Auction-rate securities guaranteed by the U.S. government	$10,400,000	'
Auction-rate securities privately insured	2,000,000	'
Auction-rate securities having credit rating 'AA'	6,000,000	'
Auction-rate securities having credit rating 'A'	2,000,000	'
Auction-rate securities having credit rating 'BBB'	4,400,000	'
Other-than-temporary impairment losses	0	'
Cash on hand, Cost	45,544,000	56,690,000
Cash on hand, Fair Value	45,544,000	56,690,000
Cash and cash equivalents, Cost	95,800,000	105,424,000
Cash and cash equivalents, Gross Unrealized Gains	'	2,000
Cash and cash equivalents, Fair Value	95,800,000	105,426,000
Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	50,256,000	48,734,000
Available-for-sale securities, Gross Unrealized Gains	'	2,000
Available-for-sale securities, Fair Value	50,256,000	48,736,000
Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	179,365,000	176,207,000
Available-for-sale securities, Gross Unrealized Losses	-15,000	-12,000
Available-for-sale securities, Gross Unrealized Gains	243,000	370,000
Available-for-sale securities, Fair Value	179,593,000	176,565,000
Long-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	12,425,000	12,525,000
Available-for-sale securities, Gross Unrealized Losses	-1,793,000	-1,156,000
Available-for-sale securities, Fair Value	10,632,000	11,369,000
U.S. Treasury bills \| Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	25,049,000
Available-for-sale securities, Gross Unrealized Gains	'	1,000
Available-for-sale securities, Fair Value	'	25,050,000
Money market funds \| Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	39,538,000	22,685,000
Available-for-sale securities, Gross Unrealized Gains	'	1,000
Available-for-sale securities, Fair Value	39,538,000	22,686,000
Certificates of deposit \| Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	7,768,000	'
Available-for-sale securities, Fair Value	7,768,000	'
Commercial paper \| Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	2,499,000	'
Available-for-sale securities, Fair Value	2,499,000	'
Commercial paper \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	3,748,000	'
Available-for-sale securities, Fair Value	3,748,000	'
Municipal bonds \| Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	451,000	1,000,000
Available-for-sale securities, Fair Value	451,000	1,000,000
Municipal bonds \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	119,289,000	45,646,000
Available-for-sale securities, Gross Unrealized Losses	-11,000	-7,000
Available-for-sale securities, Gross Unrealized Gains	182,000	50,000
Available-for-sale securities, Fair Value	119,460,000	45,689,000
Corporate bonds \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	17,788,000	59,089,000
Available-for-sale securities, Gross Unrealized Losses	-4,000	-5,000
Available-for-sale securities, Gross Unrealized Gains	60,000	267,000
Available-for-sale securities, Fair Value	17,844,000	59,351,000
Variable-rate demand notes \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	38,025,000	41,785,000
Available-for-sale securities, Fair Value	38,025,000	41,785,000
Asset-backed securities \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	515,000	15,058,000
Available-for-sale securities, Gross Unrealized Gains	1,000	11,000
Available-for-sale securities, Fair Value	516,000	15,069,000
U.S. government bonds \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	12,638,000
Available-for-sale securities, Gross Unrealized Gains	'	25,000
Available-for-sale securities, Fair Value	'	12,663,000
International government bonds \| Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	1,991,000
Available-for-sale securities, Gross Unrealized Gains	'	17,000
Available-for-sale securities, Fair Value	'	2,008,000
Auction rate securities \| Long-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	12,425,000	12,525,000
Available-for-sale securities, Gross Unrealized Losses	-1,793,000	-1,156,000
Available-for-sale securities, Fair Value	$10,632,000	$11,369,000

Cash_Cash_Equivalents_and_Inve3

Cash, Cash Equivalents and Investments (Details 2) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	$13,684	$26,695
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	10,632	11,369
Total fair value of available-for-sale securities, continuous loss position	24,316	38,064
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-15	-12
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,793	-1,156
Available-for-sale securities, total gross unrealized losses	-1,808	-1,168
Cost	'	'
Due in one year or less, Cost	115,109	'
Due after one year through ten years, Cost	80,987	'
Due after ten years, Cost	45,950	'
Total Cost	242,046	'
Fair Value	'	'
Due in one year or less, Fair Value	115,177	'
Due after one year through ten years, Fair Value	81,147	'
Due after ten years, Fair Value	44,157	'
Total Fair Value	240,481	'
Municipal bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	11,079	17,152
Total fair value of available-for-sale securities, continuous loss position	11,079	17,152
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-11	-7
Available-for-sale securities, total gross unrealized losses	-11	-7
Auction rate securities	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	10,632	11,369
Total fair value of available-for-sale securities, continuous loss position	10,632	11,369
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,793	-1,156
Available-for-sale securities, total gross unrealized losses	-1,793	-1,156
Corporate bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	2,605	9,543
Total fair value of available-for-sale securities, continuous loss position	2,605	9,543
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-4	-5
Available-for-sale securities, total gross unrealized losses	($4)	($5)

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (Cash flow hedges, Interest rate swaps, USD $)	Dec. 28, 2013
In Millions, unless otherwise specified	Dec. 28, 2013
Cash flow hedges \| Interest rate swaps	'
Notional amount	'
Original notional value	$100

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)	12 Months Ended
Derivative Financial Instruments (Details 2) (USD $)	Dec. 28, 2013	Dec. 29, 2012
Derivative Financial Instruments	'	'
Description of variable rate	'LIBOR	'
Notional value of interest rate swap agreement hedging headquarters lease	'	$50,100,000
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period	'	900,000
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	513,000	'
Other non-current liabilities	'	'
Derivative financial instrument	'	'
Fair value of interest rate swap	'	$658,000

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 3) (USD $)	12 Months Ended
Derivative Financial Instruments (Details 3) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss)	'	'	'
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period	'	$900,000	'
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months	500,000	'	'
Cash flow hedges \| Interest rate swaps	'	'	'
Derivative Instruments, Gain (Loss)	'	'	'
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period	611,000	-956,000	-424,000
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	'	-2,197,000	-2,237,000
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	($560,000)	($98,000)	'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	$95,800	$105,426
Total short-term investments	179,593	176,565
Total long-term investments	10,632	11,369
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	39,538	47,736
Total short-term investments	'	12,663
Total assets at fair value	39,538	60,399
Assets and liabilities measured at fair value on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury bills	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	25,050
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	39,538	22,686
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 short-term investments	'	12,663
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	10,718	1,000
Total short-term investments	179,593	163,902
Derivative instruments	513	'
Other assets, net	513	'
Total assets at fair value	190,824	164,902
Derivative instruments	'	658
Total liabilities at fair value	'	658
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	7,768	'
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	2,499	'
Total short-term investments	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	451	1,000
Total short-term investments	119,460	45,689
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	38,025	41,785
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 short-term investments	17,844	59,351
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	516	15,069
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	'	2,008
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	10,632	11,369
Total assets at fair value	10,632	11,369
Contingent consideration	12,919	2,750
Total liabilities at fair value	12,919	2,750
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	10,632	11,369
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	50,256	48,736
Total short-term investments	179,593	176,565
Total long-term investments	10,632	11,369
Derivative instruments	513	'
Other assets, net	513	'
Total assets at fair value	240,994	236,670
Derivative instruments	'	658
Contingent consideration	12,919	2,750
Total liabilities at fair value	12,919	3,408
Assets and liabilities measured at fair value on recurring basis \| Fair Value \| U.S. Treasury bills	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	25,050
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	39,538	22,686
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	7,768	'
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	2,499	'
Total short-term investments	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	451	1,000
Total short-term investments	119,460	45,689
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	38,025	41,785
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 short-term investments	17,844	59,351
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	516	15,069
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 short-term investments	'	12,663
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	'	2,008
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	$10,632	$11,369

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Details 2) (Auction rate securities, Weighted Average, Discounted cash flow)	12 Months Ended
	Dec. 28, 2013
Auction rate securities \| Weighted Average \| Discounted cash flow	'
Quantitative information for Level 3 Fair Value Measurements Assets	'
Estimated yield (as a percent)	1.11%
Expected holding period	'10 years
Estimated discount rate (as a percent)	4.05%

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Details 3) (Contingent consideration, Monte Carlo simulation)	12 Months Ended
	Dec. 28, 2013
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)	26.20%
Expected term	'1 year
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)	51.90%
Expected term	'5 years
Estimated discount rate (as a percent)	1.60%

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments (Details 4) (Assets and liabilities measured at fair value on recurring basis, Auction rate securities, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Assets and liabilities measured at fair value on recurring basis \| Auction rate securities	'	'
Fair value assets reconciliation of changes	'	'
Balance at the beginning of the period	$11,369	$17,477
Settlements	-100	-6,700
Gain (loss) included in other comprehensive income	-637	592
Balance at the end of the period	$10,632	$11,369

Fair_Value_of_Financial_Instru6

Fair Value of Financial Instruments (Details 5) (Assets and liabilities measured at fair value on recurring basis, Contingent consideration, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
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	$2,750	$876
Issues	13,964	4,004
Gain recognized in earnings	-3,795	-2,130
Balance at the end of the period	12,919	2,750
Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:	$1,045	$1,254

Balance_Sheet_Details_Details

Balance Sheet Details (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Inventories	'	'
Work in progress	$34,503	$42,103
Finished goods	10,768	7,476
Total inventories	45,271	49,579
Prepaid Expenses and Other Current Assets	'	'
Distributor Advances	31,839	21,260
Other	15,812	20,177
Prepaid expenses and other current assets	47,651	41,437
Property and Equipment	'	'
Property and equipment, gross	205,968	200,969
Accumulated depreciation	-73,523	-65,698
Property and equipment, net	132,445	135,271
Accrued Expenses	'	'
Accrued compensation and benefits	24,896	22,298
Other	21,079	18,112
Accrued expenses	45,975	40,410
Other Non-current Liabilities	'	'
Acquisition-related escrow	20,010	'
Contingent consideration	12,919	'
Acquired unfavorable leases	11,268	11,794
Other	11,744	8,821
Other Non-current Liabilities	55,941	20,615
Buildings and improvements	'	'
Property and Equipment	'	'
Property and equipment, gross	94,221	90,900
Equipment	'	'
Property and Equipment	'	'
Property and equipment, gross	51,071	48,219
Computers and purchased software	'	'
Property and Equipment	'	'
Property and equipment, gross	25,556	27,294
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	3,496	3,129
Leasehold improvements	'	'
Property and Equipment	'	'
Property and equipment, gross	$7,784	$7,587

Risks_and_Uncertainties_Detail

Risks and Uncertainties (Details)	12 Months Ended
Risks and Uncertainties (Details)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
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)	26.00%	23.00%	'
Accounts receivable \| Customers \| Arrow Electronics	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	10.00%	'	'
Accounts receivable \| Customers \| Arrow Electronics \| High end of range	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	'	10.00%	'
Accounts receivable \| Customers \| Avnet	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	'	12.00%	'
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)	21.00%	22.00%	24.00%
Revenue \| Avnet	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	11.00%	11.00%	12.00%
Revenue \| Macnica	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	'	'	10.00%
Revenue \| Macnica \| High end of range	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	10.00%	10.00%	'
Revenue \| Customers \| Samsung	'	'	'
Risks and uncertainties	'	'	'
Concentrations of credit risk (as a percent)	15.00%	19.00%	13.00%

Acquisitions_Details

Acquisitions (Details) (USD $)

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

0 Months Ended

Share data in Millions, unless otherwise specified

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Oct. 17, 2013

Jul. 01, 2013

Dec. 28, 2013

Jul. 01, 2013

Dec. 28, 2013

Jul. 01, 2013

Jul. 03, 2012

Dec. 28, 2013

Jul. 03, 2012

Sep. 30, 2012

Dec. 31, 2011

Jan. 25, 2011

Customer relationships

Trademarks

Energy Micro

Ember

Corporate Headquarters Buildings

400 WCC

200 WCC

Spectra Linear

Core and developed technology

Customer relationships

Trademarks

In-process research and development

Developed technology

Customer relationships

Trademarks

In-process research and development

item

Core and developed technology

Customer relationships

Acquisition

Purchase price of acquisition

$140,600,000

$79,000,000

Estimated fair value

4,000,000

1,000,000

Initial consideration

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

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

12,919,000

14,000,000

Additional consideration on acquisition

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

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

Net liabilities assumed

8,000,000

Post combination expenses, additional compensation paid to employees of acquired entity

4,500,000

Purchase price allocation

Intangible assets

55,400,000

29,100,000

6,400,000

1,300,000

18,600,000

39,140,000

17,800,000

5,620,000

910,000

14,810,000

17,960,000

16,560,000

1,400,000

Cash and cash equivalents

919,000

3,115,000

Accounts receivable

1,928,000

1,759,000

Inventories

4,749,000

1,199,000

Other current assets

6,486,000

324,000

1,658,000

Goodwill

228,781,000

130,265,000

115,489,000

98,515,000

14,777,000

4,097,000

Deferred tax assets - non-current

16,449,000

12,316,000

Other non-current assets

3,117,000

1,776,000

597,000

Notes payable - current portion

-4,641,000

Current liabilities

-8,000,000

-3,287,000

-3,112,000

Non-current deferred tax liabilities, net

-6,288,000

Long-term debt

-8,434,000

Other non-current liabilities

-1,133,000

Non-current liabilities

-3,254,000

Total purchase price

140,582,000

78,971,000

94,350,000

28,579,000

Acquisition-related costs recorded in selling, general and administrative expenses

2,400,000

Weighted-Average Amortization Period

'9 years

'10 years

'7 years

'8 years

'11 years

'9 years

'12 years

'10 years

Discount rate applicable to the cash flows (as a percent)

13.00%

12.50%

Purchase option price for buildings

44,300,000

50,100,000

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

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
Goodwill and Other Intangible Assets (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Goodwill	'	'	'
Balance at the beginning of the period	$130,265,000	$115,489,000	'
Additions due to business combinations	98,516,000	14,776,000	'
Balance at the end of the period	228,781,000	130,265,000	115,489,000
Gross carrying amount and accumulated amortization of other intangible assets	'	'	'
Weighted-Average Amortization Period	'9 years	'	'
Intangible assets subject to amortization, Gross Amount	158,050,000	107,430,000	'
Intangible assets subject to amortization, Accumulated Amortization	-45,057,000	-31,490,000	'
Total intangible assets, Gross Amount	176,650,000	122,240,000	'
Intangible assets acquired in acquisition of Energy Micro	55,400,000	'	'
Fully amortized intangible assets, gross	1,000,000	'	'
Amortization expense related to intangible assets	14,600,000	10,700,000	9,900,000
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years	'	'	'
2014	17,060,000	'	'
2015	16,669,000	'	'
2016	16,019,000	'	'
2017	15,052,000	'	'
2018	14,309,000	'	'
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	18,600,000	14,810,000	'
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	138,340,000	95,420,000	'
Intangible assets subject to amortization, Accumulated Amortization	-41,782,000	-30,145,000	'
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	14,500,000	8,100,000	'
Intangible assets subject to amortization, Accumulated Amortization	-2,330,000	-1,057,000	'
Patents	'	'	'
Gross carrying amount and accumulated amortization of other intangible assets	'	'	'
Weighted-Average Amortization Period	'6 years	'	'
Intangible assets subject to amortization, Gross Amount	3,000,000	3,000,000	'
Intangible assets subject to amortization, Accumulated Amortization	-750,000	-250,000	'
Trademarks	'	'	'
Gross carrying amount and accumulated amortization of other intangible assets	'	'	'
Weighted-Average Amortization Period	'10 years	'	'
Intangible assets subject to amortization, Gross Amount	2,210,000	910,000	'
Intangible assets subject to amortization, Accumulated Amortization	($195,000)	($38,000)	'

Debt_Details

Debt (Details) (USD $)

1 Months Ended

12 Months Ended

Jul. 31, 2012

Dec. 28, 2013

Sep. 27, 2012

Jul. 31, 2012

Dec. 28, 2013

Jul. 31, 2012

Dec. 28, 2013

Term Loan Facility

Agreement

Revolving Credit Facility

Term loan facility and revolving credit facility, other than swingline loans

Term loan facility, revolving credit facility, swingline and other loans

LIBOR

Prime Rate

Federal Funds

one-month LIBOR

Base rate

Low end of range

High end of range

Low end of range

High end of range

Debt

Maximum borrowing capacity

$100,000,000

$230,000,000

$130,000,000

Term of debt instrument

'5 years

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

Sublimit on letters of credit

25,000,000

Sublimit on swingline loan

10,000,000

Additional increase in borrowing capacity of the line of credit available at the entity's option

50,000,000

Amount borrowed under the term loan facility

100,000,000

Debt Instrument Base rate

'LIBOR

'Bank of America prime rate

'Federal Funds rate

'one-month LIBOR

'base rate

Interest rate added to the base rate (as a percent)

1.50%

2.50%

0.50%

1.00%

0.50%

1.50%

Maximum leverage ratio

2.5

Minimum fixed charge coverage ratio

1.5

Fixed interest rate percentage

0.76%

Combined interest rate percentage

2.51%

Term Loan Facility

2014

7,500,000

2015

10,000,000

2016

10,000,000

2017

67,500,000

Total debt

$95,000,000

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)

12 Months Ended

1 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Jan. 31, 2014

Jan. 31, 2013

Apr. 30, 2012

Oct. 31, 2011

Jul. 31, 2010

Unrealized Gain (Loss) on Cash Flow Hedge

Net Unrealized Losses on Available-For-Sale Securities

Maximum

Stockholders' Equity

Number of shares of common stock issued

1,600,000

Number of shares issued in connection with the acquisition of Energy Micro

500,000

Stockholders' Equity

Program Amount authorized to repurchase

$100,000

$50,000

$100,000

$50,000

$150,000

Components of accumulated other comprehensive loss, net of taxes

Balance at beginning of the period

-946

-2,467

-3,648

-428

-1,299

-2,477

-518

-1,168

-1,171

Other comprehensive income (loss) before reclassifications

-273

397

-621

-276

-348

650

Amounts reclassified from accumulated other comprehensive loss

213

1,492

1,454

364

1,492

1,454

-151

Other comprehensive income

262

1,521

1,181

761

871

1,178

-499

650

Balance at end of the period

-684

-946

-2,467

333

-428

-1,299

-1,017

-518

-1,168

Repurchase of common stock (in shares)

700,000

1,700,000

3,200,000

Repurchase of common stock

$26,022

$62,019

$110,063

Stockholders_Equity_Details_2

Stockholders' Equity (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Amounts Reclassified from AOCI	'	'	'
Rent expense	($4,200)	($4,400)	($4,500)
Interest expense	-3,293	-1,149	-37
Interest income	853	1,338	1,859
Income before income taxes	62,027	86,348	52,340
Income tax benefit	-12,208	-22,800	-16,868
Net income	49,819	63,548	35,472
Net changes to available-for-sale securities:	'	'	'
Unrealized gains (losses) arising during the period	187	-350	-1
Reclassification for gains included in net income	81	'	'
Net changes to cash flow hedges	'	'	'
Unrealized gains (losses) arising during the period	-214	335	148
Reclassification for losses included in net income	-196	-803	-783
Other comprehensive income	-142	-818	-636
Reclassifications From Accumulated Other Comprehensive Loss	'	'	'
Amounts Reclassified from AOCI	'	'	'
Income before income taxes	-328	-2,295	-2,237
Income tax benefit	115	803	783
Net income	-213	-1,492	-1,454
Losses on cash flow hedge \| Reclassifications From Accumulated Other Comprehensive Loss	'	'	'
Amounts Reclassified from AOCI	'	'	'
Rent expense	'	-2,295	-2,237
Interest expense	-560	'	'
Gains on available-for-sales securities \| Reclassifications From Accumulated Other Comprehensive Loss	'	'	'
Amounts Reclassified from AOCI	'	'	'
Interest income	$232	'	'

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)

12 Months Ended

Dec. 29, 2012

Dec. 28, 2013

Dec. 31, 2009

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Market Stock Units

2009 Stock Incentive Plan

2000 Stock Incentive Plan

2009 Employee Stock Purchase Plan

Low end of range

High end of range

Stock options and stock appreciation rights

Stock options

Full value awards

Market Stock Units

Low end of range

High end of range

Stock options

High end of range

Stock-based compensation costs

Term of plan

'10 years

Number of shares deducted for each share granted under 2009 Stock Incentive Plan

1.55

Award vesting period

'3 years

'4 years

'3 years

'8 years

Minimum exercise price as percentage of fair market value of shares on the date of grant

100.00%

85.00%

Maximum term of offering

'24 months

Term of award

'10 years

Number of shares granted

1,100,000

800,000

132,000

110,000

55,000

Stock options granted (in shares)

Shares issued

190,000

181,000

169,000

Net reduction in selling, general and administrative expense

$1,900,000

Weighted-average fair value for purchase rights granted (in dollars per share)

$9.34

Fair value assumptions

Expected volatility (as a percent)

27.00%

38.00%

27.00%

Risk-free interest rate %

0.10%

0.20%

Expected term

'7 months

'15 months

'11 months

Cash consideration based upon achievement of specified levels of market conditions

StockBased_Compensation_Detail1

Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Summary of stock-based payment and stock option values	'	'	'
Total unrecognized compensation costs related to awards	$51,200,000	'	'
Weighted-average period of recognition of unrecognized compensation costs	'2 years 1 month 6 days	'	'
Cash received for the issuance of common stock, net of shares withheld for taxes	15,300,000	'	'
Stock options	'	'	'
Stock options activity	'	'	'
Outstanding at the beginning of the year (in shares)	1,696	'	'
Exercised (in shares)	-480	'	'
Cancelled or expired (in shares)	-127	'	'
Outstanding at the end of the period (in shares)	1,089	1,696	'
Vested and expected to vest at the end of the period (in shares)	1,089	'	'
Exercisable at the end of the period (in shares)	1,089	'	'
Weighted-Average Exercise Price	'	'	'
Outstanding at the beginning of the year (in dollars per share)	$35.86	'	'
Exercised (in dollars per share)	$34.72	'	'
Cancelled or expired (in dollars per share)	$46.87	'	'
Outstanding at the end of the year (in dollars per share)	$35.09	$35.86	'
Vested and expected to vest at the end of the period (in dollars per share)	$35.09	'	'
Exercisable at the end of the period (in dollars per share)	$35.09	'	'
Weighted-Average Remaining Contractual Term	'	'	'
Outstanding at the end of the period	'1 year 11 months 16 days	'	'
Vested and expected to vest at the end of the period	'1 year 11 months 16 days	'	'
Exercisable at the end of the period	'1 year 11 months 16 days	'	'
Aggregate Intrinsic Value	'	'	'
Outstanding at the end of the period (in dollars)	9,688,000	'	'
Vested and expected to vest at the end of the period (in dollars)	9,688,000	'	'
Options exercisable at the end of the period (in dollars)	9,688,000	'	'
Summary of stock-based payment and stock option values	'	'	'
Intrinsic value of stock options exercised	4,198,000	9,064,000	8,622,000
RSAs and RSUs	'	'	'
Summary of stock-based payment and stock option values	'	'	'
Intrinsic value of RSAs and RSUs that vested	23,649,000	40,105,000	38,769,000
Grant date fair value of RSAs and RSUs that vested	24,026,000	31,215,000	29,488,000
RSAs, RSUs and MSUs	'	'	'
Summary of restricted stock awards and restricted stock units	'	'	'
Outstanding at the beginning the of year (in shares)	1,708	'	'
Granted (in shares)	1,118	'	'
Issued (in shares)	-553	'	'
Cancelled or expired (in shares)	-192	'	'
Outstanding at the end of the period (in shares)	2,081	1,708	'
Outstanding at the end of the period and expected to vest (in shares)	1,900	'	'
Weighted-Average Remaining Vesting Term	'	'	'
Outstanding at the end of period	'1 year 3 months	'	'
Outstanding at the end of period and expected to vest	'1 year 3 months	'	'
Aggregate Intrinsic Value	'	'	'
Outstanding at the end of the period (in dollars)	88,135,000	'	'
Outstanding at the end of the period and expected to vest (in dollars)	$80,471,000	'	'
Weighted-average grant date fair value	'	'	'
Per grant of RSAs, RSUs and MSUs (in dollars per share)	$41.69	$43.82	$44.73

StockBased_Compensation_Detail2

Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Stock-based compensation costs	'	'	'
Share based compensation cost before tax	$30,800	$31,176	$36,115
Income tax benefit	2,633	4,911	3,957
Share based compensation cost after tax	28,167	26,265	32,158
Cost of revenues	'	'	'
Stock-based compensation costs	'	'	'
Share based compensation cost before tax	952	1,206	1,319
Research and development	'	'	'
Stock-based compensation costs	'	'	'
Share based compensation cost before tax	14,530	12,602	14,872
Selling, general and administrative	'	'	'
Stock-based compensation costs	'	'	'
Share based compensation cost before tax	$15,318	$17,368	$19,924

StockBased_Compensation_Detail3

Stock-Based Compensation (Details 4)	Dec. 28, 2013
In Thousands, unless otherwise specified	Dec. 28, 2013
Stock-Based Compensation	'
Reserved shares of common stock for future issuance	6,641
2000 Stock Incentive Plan	'
Stock-Based Compensation	'
Reserved shares of common stock for future issuance	1,092
2009 Stock Incentive Plan	'
Stock-Based Compensation	'
Reserved shares of common stock for future issuance	4,913
2009 Employee Stock Purchase Plan	'
Stock-Based Compensation	'
Reserved shares of common stock for future issuance	636

Employee_Benefit_Plan_Details

Employee Benefit Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Employee Benefit Plan	'	'	'
Contribution made to the 401 (k) Plan	$3	$2.90	$2.70

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Oct. 03, 2013	Dec. 29, 2012
				MaxLinear	MaxLinear
					item
Commitments and Contingencies	'	'	'	'	'
Rent expense under operating leases	$4,200,000	$4,400,000	$4,500,000	'	'
Minimum annual future rentals	'	'	'	'	'
2014	4,232,000	'	'	'	'
2015	3,704,000	'	'	'	'
2016	3,058,000	'	'	'	'
2017	2,350,000	'	'	'	'
2018	1,449,000	'	'	'	'
Thereafter	682,000	'	'	'	'
Total minimum lease payments	15,475,000	'	'	'	'
Patent Litigation	'	'	'	'	'
Number of patent infringement lawsuits filed	'	'	'	'	3
One-time payment receivable under the Settlement Agreement	'	'	'	$1,250,000	'
Covenant period related to not to sue	'	'	'	'3 years	'

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended
	Dec. 28, 2013	Oct. 17, 2013	Jul. 01, 2013	Dec. 28, 2013	Jul. 01, 2013	Oct. 17, 2013
		Energy Micro	Energy Micro	Mr. Bock	Mr. Forre	Mr. Bogen
					Energy Micro	Energy Micro
Related Party Transaction	'	'	'	'	'	'
Amount paid to related party	$1,500,000	'	'	$0	'	'
Beneficial ownership percentage	'	'	'	'	32.00%	2.00%
Initial consideration	'	107,400,000	107,400,000	'	35,000,000	900,000
Holdback amount related to potential indemnification claims	'	20,300,000	20,300,000	'	6,500,000	400,000
Contingent consideration	'	33,300,000	33,300,000	'	10,500,000	700,000
Investment in acquired entity by related party prior to the acquisition	'	'	'	'	'	$800,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
Income Taxes (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Current:	'	'	'
Domestic	$4,796,000	$21,084,000	$14,468,000
International	4,093,000	-3,009,000	2,845,000
Total Current	8,889,000	18,075,000	17,313,000
Deferred:	'	'	'
Domestic	5,591,000	5,444,000	-70,000
International	-2,272,000	-719,000	-375,000
Total Deferred	3,319,000	4,725,000	-445,000
Provision for income taxes	12,208,000	22,800,000	16,868,000
Effective income tax rate reconciliation	'	'	'
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)	-8.20%	-11.80%	-11.00%
Research and development tax credits (as a percent)	-14.60%	-0.50%	-8.50%
Release of prior year unrecognized tax benefits (as a percent)	'	-8.40%	'
Intercompany technology license (as a percent)	'	11.80%	10.40%
Excess officer compensation (as a percent)	1.90%	1.00%	3.20%
Valuation allowance	3.80%	'	'
Nondeductible acquisition costs (as a percent)	0.20%	0.10%	2.90%
Other (as a percent)	1.60%	-0.80%	0.20%
Effective income tax rate (as a percent)	19.70%	26.40%	32.20%
Undistributed earnings of foreign subsidiaries	292,300,000	'	'
Income before income taxes	'	'	'
Domestic	41,849,000	80,494,000	48,282,000
Foreign	20,178,000	5,854,000	4,058,000
Income before income taxes	62,027,000	86,348,000	52,340,000
Valuation allowance related to certain state loss and research and development tax credit carryforwards	1,700,000	'	'
Release of valuation allowance due to the expiration of certain state net operating loss carryforwards	400,000	'	'
Reduction of valuation allowance related to an adjustment of certain acquired state net operating losses and research and development tax credit carryforwards	200,000	'	'
Deferred tax assets:	'	'	'
Net operating loss carryforwards	38,399,000	35,847,000	'
Research and development tax credit carryforwards	9,276,000	8,447,000	'
Stock-based compensation	6,757,000	8,133,000	'
Capitalized research and development	8,999,000	9,708,000	'
Deferred income on shipments to distributors	5,733,000	3,933,000	'
Accrued liabilities and other	8,302,000	7,503,000	'
Deferred tax assets	77,466,000	73,571,000	'
Less: Valuation allowance	-3,775,000	-2,114,000	'
Deferred tax assets, net	73,691,000	71,457,000	'
Deferred tax liabilities:	'	'	'
Acquired intangibles	38,444,000	28,653,000	'
Depreciation and amortization	2,022,000	1,076,000	'
Prepaid expenses and other	1,889,000	1,447,000	'
Deferred tax liabilities	42,355,000	31,176,000	'
Net deferred tax assets	$31,336,000	$40,281,000	'

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	12 Months Ended
Income Taxes (Details 2) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Operating loss and tax credit carryforwards	'	'	'
Net deferred tax assets (Liabilities)	$31,336,000	$40,281,000	'
Provision for U.S. federal and state income taxes	0	'	'
Income tax benefit reflected in earnings	-12,208,000	-22,800,000	-16,868,000
Singapore	'	'	'
Operating loss and tax credit carryforwards	'	'	'
Income tax benefit reflected in earnings	2,200,000	-13,300,000	2,500,000
The income tax benefit per diluted share (in dollars per share)	$0.05	($0.31)	$0.06
State	'	'	'
Operating loss and tax credit carryforwards	'	'	'
Operating loss carryforwards	63,900,000	'	'
Research and development credit carryforwards	11,000,000	'	'
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember \| Federal	'	'	'
Operating loss and tax credit carryforwards	'	'	'
Operating loss carryforwards	77,500,000	'	'
Research and development credit carryforwards	2,100,000	'	'
Energy Micro	'	'	'
Operating loss and tax credit carryforwards	'	'	'
Net deferred tax assets (Liabilities)	5,300,000	'	'
Energy Micro \| Foreign	'	'	'
Operating loss and tax credit carryforwards	'	'	'
Operating loss carryforwards	$29,600,000	'	'

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	12 Months Ended
Income Taxes (Details 3) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Changes in unrecognized tax benefits	'	'	'
Unrecognized tax benefits, balance at the beginning of the period	$4,364,000	$10,943,000	$10,789,000
Additions based on tax positions related to current year	316,000	1,818,000	757,000
Additions based on tax positions related to prior years	318,000	'	'
Reductions for tax positions related to prior years	'	-8,397,000	-603,000
Unrecognized tax benefits, balance at the end of the period	4,998,000	4,364,000	10,943,000
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	4,800,000	4,100,000	9,900,000
Gross increases in unrecognized tax benefits	600,000	'	'
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	1,500,000	'	'
Income Taxes	'	'	'
Accrual for the payment of interest related to unrecognized tax positions	'	0	0
Maximum	'	'	'
Income Taxes	'	'	'
Interest in the provision for income taxes recognized	100,000	'	'
Accrual for the payment of interest related to unrecognized tax positions	$100,000	'	'

Segment_Information_Details

Segment Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
	product
	segment
Segment Information	'	'	'
Number of operating segments	1	'	'
Number of product categories	3	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	$580,087	$563,294	$491,625
Property and equipment, net	132,445	135,271	'
United States	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	68,566	64,856	67,432
Property and equipment, net	126,263	127,716	'
China	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	253,261	219,400	152,533
Taiwan	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	55,036	64,150	59,208
Japan	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	32,557	31,315	50,270
South Korea	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	21,303	57,910	70,252
Rest of world	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	149,364	125,663	91,930
Property and equipment, net	6,182	7,555	'
Broad-based	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	281,777	270,098	208,697
Broadcast	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	199,837	186,067	169,548
Access	'	'	'
Revenue and property and equipment, net by geographic area	'	'	'
Revenues	$98,473	$107,129	$113,380

SCHEDULE_II_VALUATION_AND_QUAL1

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Valuation Allowance for Deferred Tax Assets, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Valuation Allowance for Deferred Tax Assets	'	'
Valuation Allowance	'	'
Balance at Beginning of Period	$2,114	'
Charged to Expenses	2,335	'
Charged to Goodwill	'	2,114
Deductions	-674	'
Balance at End of Period	$3,775	$2,114