Silicon Laboratories (SLAB) 10-Q 25 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 28, 2014	Jul. 15, 2014
Document and Entity Information	'	'
Entity Registrant Name	'SILICON LABORATORIES INC	'
Entity Central Index Key	'0001038074	'
Document Type	'10-Q	'
Document Period End Date	28-Jun-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--01-03	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	43,421,471
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jun. 28, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$93,290	$95,800
Short-term investments	235,645	179,593
Accounts receivable, net of allowances for doubtful accounts of $788 at June 28, 2014 and $797 at December 28, 2013	69,042	72,124
Inventories	45,557	45,271
Deferred income taxes	17,658	18,878
Prepaid expenses and other current assets	47,785	47,651
Total current assets	508,977	459,317
Long-term investments	10,993	10,632
Property and equipment, net	129,357	132,445
Goodwill	228,781	228,781
Other intangible assets, net	124,106	131,593
Other assets, net	22,251	28,382
Total assets	1,024,465	991,150
Current liabilities:	'	'
Accounts payable	24,745	22,126
Current portion of long-term debt	10,000	7,500
Accrued expenses	65,672	45,975
Deferred income on shipments to distributors	33,437	30,853
Income taxes	896	2,693
Total current liabilities	134,750	109,147
Long-term debt	82,500	87,500
Other non-current liabilities	29,610	55,941
Total liabilities	246,860	252,588
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Preferred stock - $0.0001 par value; 10,000 shares authorized; no shares issued and outstanding	'	'
Common stock - $0.0001 par value; 250,000 shares authorized; 43,406 and 42,779 shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	4	4
Additional paid-in capital	65,199	48,630
Retained earnings	713,001	690,612
Accumulated other comprehensive loss	-599	-684
Total stockholders' equity	777,605	738,562
Total liabilities and stockholders' equity	$1,024,465	$991,150

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 28, 2014	Dec. 28, 2013
In Thousands, except Per Share data, unless otherwise specified
Condensed Consolidated Balance Sheets	'	'
Accounts receivable, allowances for doubtful accounts (in dollars)	$788	$797
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	43,406	42,779
Common stock, shares outstanding	43,406	42,779

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Condensed Consolidated Statements of Income	'	'	'	'
Revenues	$154,918	$141,543	$300,609	$286,918
Cost of revenues	56,255	52,770	114,841	110,773
Gross margin	98,663	88,773	185,768	176,145
Operating expenses:	'	'	'	'
Research and development	41,844	37,387	84,329	74,969
Selling, general and administrative	36,017	32,357	70,628	61,510
Operating expenses	77,861	69,744	154,957	136,479
Operating income	20,802	19,029	30,811	39,666
Other income (expense):	'	'	'	'
Interest income	200	152	502	487
Interest expense	-780	-831	-1,578	-1,673
Other income (expense), net	-6	114	61	62
Income before income taxes	20,216	18,464	29,796	38,542
Provision for income taxes	5,937	5,852	7,407	5,896
Net income	$14,279	$12,612	$22,389	$32,646
Earnings per share:	'	'	'	'
Basic (in dollars per share)	$0.33	$0.30	$0.52	$0.77
Diluted (in dollars per share)	$0.32	$0.29	$0.51	$0.76
Weighted-average common shares outstanding:	'	'	'	'
Basic (in shares)	43,462	42,552	43,271	42,370
Diluted (in shares)	44,218	43,269	44,137	43,191

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Condensed Consolidated Statements of Comprehensive Income	'	'	'	'
Net income	$14,279	$12,612	$22,389	$32,646
Net changes to available-for-sale securities	'	'	'	'
Unrealized gains (losses) arising during the period	59	-1,093	472	-1,207
Reclassification for gains included in net income	'	-232	'	-232
Net changes to cash flow hedges	'	'	'	'
Unrealized gains (losses) arising during the period	-486	1,101	-627	1,144
Reclassification for losses included in net income	143	141	286	322
Other comprehensive income (loss), before tax	-284	-83	131	27
Provision (benefit) for income taxes	-99	-29	46	10
Other comprehensive income (loss)	-185	-54	85	17
Comprehensive income	$14,094	$12,558	$22,474	$32,663

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013
Operating Activities	'	'
Net income	$22,389	$32,646
Adjustments to reconcile net income to cash provided by operating activities:	'	'
Depreciation of property and equipment	6,427	6,634
Amortization of other intangible assets and other assets	8,839	5,635
Stock-based compensation expense	18,559	13,684
Income tax benefit (shortfall) from stock-based awards	377	-489
Excess income tax benefit from stock-based awards	-589	-243
Deferred income taxes	4,665	9,277
Changes in operating assets and liabilities:	'	'
Accounts receivable	3,082	9,388
Inventories	-123	-1,028
Prepaid expenses and other assets	3,394	5,023
Accounts payable	3,846	-2,271
Accrued expenses	-4,902	-6,013
Deferred income on shipments to distributors	2,584	293
Income taxes	-5,130	-6,439
Net cash provided by operating activities	63,418	66,097
Investing Activities	'	'
Purchases of available-for-sale investments	-117,744	-121,994
Proceeds from sales and maturities of available-for-sale investments	61,803	146,870
Purchases of property and equipment	-3,339	-6,498
Purchases of other assets	-2,726	-2,438
Net cash provided by (used in) investing activities	-62,006	15,940
Financing Activities	'	'
Proceeds from issuance of common stock, net of shares withheld for taxes	8,943	9,512
Excess income tax benefit from stock-based awards	589	243
Repurchases of common stock	-10,954	'
Payments on debt	-2,500	-3,750
Net cash provided by (used in) financing activities	-3,922	6,005
Increase (decrease) in cash and cash equivalents	-2,510	88,042
Cash and cash equivalents at beginning of period	95,800	105,426
Cash and cash equivalents at end of period	$93,290	$193,468

Significant_Accounting_Policie

Significant Accounting Policies	6 Months Ended
	Jun. 28, 2014
Significant Accounting Policies	'
Significant Accounting Policies	'
	1.  Significant Accounting Policies
	Basis of Presentation and Principles of Consolidation
	The Condensed Consolidated Financial Statements included herein are unaudited; however, they contain all normal recurring accruals and adjustments which, in the opinion of management, are necessary to present fairly the condensed consolidated financial position of Silicon Laboratories Inc. and its subsidiaries (collectively, the “Company”) at June 28, 2014 and December 28, 2013, the condensed consolidated results of its operations for the three and six months ended June 28, 2014 and June 29, 2013, the Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 28, 2014 and June 29, 2013, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 28, 2014 and June 29, 2013. All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated results of operations for the three and six months ended June 28, 2014 are not necessarily indicative of the results to be expected for the full year.
	The accompanying unaudited Condensed Consolidated Financial Statements do not include certain footnotes and financial presentations normally required under U.S. generally accepted accounting principles (GAAP). Therefore, these Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto for the year ended December 28, 2013, included in the Company’s Form 10-K filed with the Securities and Exchange Commission (SEC) on January 31, 2014.
	The Company prepares financial statements on a 52-53 week year that ends on the Saturday closest to December 31. Fiscal 2014 will have 53 weeks with the extra week occurring in the fourth quarter of the year. Fiscal 2013 had 52 weeks.  In a 52-week year, each fiscal quarter consists of 13 weeks.
	Revenue Recognition
	Revenues are generated predominately by sales of the Company’s integrated circuits (ICs). The Company recognizes revenue when all of the following criteria are met: 1) there is persuasive evidence that an arrangement exists, 2) delivery of goods has occurred, 3) the sales price is fixed or determinable, and 4) collectibility is reasonably assured. Generally, revenue from product sales to direct customers and contract manufacturers is recognized upon shipment.
	A portion of the Company’s sales are made to distributors under agreements allowing certain rights of return and price protection related to the final selling price to the end customers. Accordingly, the Company defers revenue and cost of revenue on such sales until the distributors sell the product to the end customers. The net balance of deferred revenue less deferred cost of revenue associated with inventory shipped to a distributor but not yet sold to an end customer is recorded in the deferred income on shipments to distributors liability on the Consolidated Balance Sheet. Such net deferred income balance reflects the Company’s estimate of the impact of rights of return and price protection.
	A small portion of the Company’s revenues is derived from the sale of patents. The above revenue recognition criteria for patent sales are generally met upon the execution of the patent sale agreement.
	Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board (FASB) issued FASB Accounting Standards Update (ASU) No. 2014-12, Compensation — Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in this update require that a performance target that affects vesting and that could be achieved after the requisite service period should be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718 as it relates to awards with performance conditions that affect vesting to account for such awards. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. ASU 2014-12 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Earlier adoption is permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements.
	In May 2014, the FASB issued FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides a five-step process to achieve that core principle. ASU 2014-09 requires disclosures enabling users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, using one of two retrospective application methods. Early application is not permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its financial statements.
	In April 2014, the FASB issued FASB ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update require a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. ASU 2014-08 expands disclosure requirements about discontinued operations and adds new disclosures for individually significant dispositions that do not qualify as discontinued operations. ASU 2014-08 is effective prospectively for annual periods beginning on or after December 15, 2014, and interim periods within annual periods beginning on or after December 15, 2015. Early adoption is permitted, but only for disposals that have not been reported in financial statements previously issued. The adoption of this ASU is not expected to have a material impact on the Company’s financial statements.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 28, 2014
Earnings Per Share	'
Earnings Per Share	'
	2. Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):
		Three Months Ended				Six Months Ended
		June 28,		June 29,		June 28,		June 29,
		2014		2013		2014		2013
	Net income	$	14,279	$	12,612	$	22,389	$	32,646
	Shares used in computing basic earnings per share	43,462		42,552		43,271		42,370
	Effect of dilutive securities:
	Stock options and other stock-based awards	756		717		866		821
	Shares used in computing diluted earnings per share	44,218		43,269		44,137		43,191
	Earnings per share:
	Basic	$	0.33	$	0.3	$	0.52	$	0.77
	Diluted	$	0.32	$	0.29	$	0.51	$	0.76
	For the three months ended June 28, 2014 and June 29, 2013 and the six months ended June 28, 2014 and June 29, 2013, approximately 0.1 million, 0.5 million, 0.2 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	6 Months Ended
	Jun. 28, 2014
Cash, Cash Equivalents and Investments	'
Cash, Cash Equivalents and Investments	'
	3. Cash, Cash Equivalents and Investments
	The Company’s cash equivalents and short-term investments as of June 28, 2014 consisted of municipal bonds, corporate bonds, variable-rate demand notes, commercial paper, money market funds, certificates of deposit, asset-backed securities, international government bonds, U.S. government bonds and U.S. government agency. 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 June 28, 2014, 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 June 28, 2014, $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 June 28, 2014. 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 June 28, 2014.
	The Company’s cash, cash equivalents and investments consist of the following (in thousands):
		June 28, 2014
		Cost		Gross			Gross		Fair Value
				Unrealized			Unrealized
				Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand	$	56,959	$	—		$	—	$	56,959
	Available-for-sale securities:
	Money market funds	16,670		—			—		16,670
	Commercial paper	13,446		—			—		13,446
	Certificates of deposit	5,315		—			—		5,315
	Municipal bonds	900		—			—		900
	Total available-for-sale securities	36,331		—			—		36,331
	Total cash and cash equivalents	$	93,290	$	—		$	—	$	93,290
	Short-term Investments:
	Available-for-sale securities:
	Municipal bonds	$	157,600	$	(2	)	$	290	$	157,888
	Corporate bonds	32,470		(15		)	67		32,522
	Variable-rate demand notes	29,645		—			—		29,645
	Commercial paper	6,542		—			—		6,542
	Asset-backed securities	4,410		(3		)	2		4,409
	International government bonds	2,539		(1		)	1		2,539
	Certificates of deposit	850		—			—		850
	U.S. government bonds	650		—			—		650
	U.S. government agency	601		(1		)	—		600
	Total short-term investments	$	235,307	$	(22	)	$	360	$	235,645
	Long-term Investments:
	Available-for-sale securities:
	Auction rate securities	$	12,425	$	(1,432	)	$	—	$	10,993
	Total long-term investments	$	12,425	$	(1,432	)	$	—	$	10,993
		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
	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 June 28, 2014	Fair		Gross			Fair		Gross			Fair		Gross
		Value		Unrealized			Value		Unrealized			Value		Unrealized
				Losses					Losses					Losses
Auction rate securities	$	—	$	—		$	10,993	$	(1,432	)	$	10,993	$	(1,432	)
Corporate bonds	10,992		(15		)	—		—			10,992		(15		)
Municipal bonds	8,154		(2		)	—		—			8,154		(2		)
Asset-backed securities	2,791		(3		)	—		—			2,791		(3		)
International government bond	1,471		(1		)	—		—			1,471		(1		)
U.S. government agency	600		(1		)	—		—			600		(1		)
	$	24,008	$	(22	)	$	10,993	$	(1,432	)	$	35,001	$	(1,454	)
	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	)
The gross unrealized losses as of June 28, 2014 and December 28, 2013 were due primarily to the illiquidity of the Company’s auction-rate securities and, to a lesser extent, to changes in market interest rates.
The following summarizes the contractual underlying maturities of the Company’s available-for-sale investments at June 28, 2014 (in thousands):
	Cost		Fair
			Value
Due in one year or less	$	128,339	$	128,444
Due after one year through ten years	116,829		117,062
Due after ten years	38,895		37,463
	$	284,063	$	282,969

Derivative_Financial_Instrumen

Derivative Financial Instruments	6 Months Ended
	Jun. 28, 2014
Derivative Financial Instruments	'
Derivative Financial Instruments	'
	4. 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 objective is to offset increases and decreases in expenses resulting from changes in interest rates with gains and losses on the derivative contract, thereby reducing volatility of earnings. The Company does not use derivative contracts for speculative purposes.
	The Company’s interest rate swap agreement is designated and qualifies as a cash flow hedge. The effective portion of the gain or loss on the interest rate swap 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.
	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 Company did not discontinue any cash flow hedges in any of 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 June 28, 2014, 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		June 28,			December 28,
				2014			2013
	Interest rate swap	Other assets, net		$	172		$	513
	The before-tax effect of derivative instruments in cash flow hedging relationships was as follows (in thousands):
		Gain (Loss) Recognized							Loss Reclassified
		in OCI on Derivatives							from Accumulated
		(Effective Portion)							OCI into Income
		during the:							(Effective Portion)
									during the:
		Three Months Ended						Location of Loss	Three Months Ended
		June 28,			June 29,			Reclassified into	June 28,			June 29,
		2014			2013			Income	2014			2013
	Interest rate swaps	$	(486	)	$	1,101		Interest expense	$	(143	)	$	(141	)
		Six Months Ended							Six Months Ended
		June 28,			June 29,				June 28,			June 29,
		2014			2013				2014			2013
	Interest rate swaps	$	(627	)	$	1,144		Interest expense	$	(286	)	$	(322	)
	The Company expects to reclassify $0.5 million of its interest rate swap losses included in accumulated other comprehensive loss as of June 28, 2014 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	6 Months Ended
	Jun. 28, 2014
Fair Value of Financial Instruments	'
Fair Value of Financial Instruments	'
	5. 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.
	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 June 28, 2014 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		$	16,670		$	—		$	—	$	16,670
	Commercial paper		—			13,446			—		13,446
	Certificates of deposit		—			5,315			—		5,315
	Municipal bonds		—			900			—		900
	Total cash equivalents		$	16,670		$	19,661		$	—	$	36,331
	Short-term Investments:
	Municipal bonds		$	—		$	157,888		$	—	$	157,888
	Corporate bonds		—			32,522			—		32,522
	Variable-rate demand notes		—			29,645			—		29,645
	Commercial paper		—			6,542			—		6,542
	Asset-backed securities		—			4,409			—		4,409
	International government bonds		—			2,539			—		2,539
	Certificates of deposit		—			850			—		850
	U.S. government bond		650			—			—		650
	U.S. government agency		—			600			—		600
	Total short-term investments		$	650		$	234,995		$	—	$	235,645
	Long-term Investments:
	Auction rate securities		$	—		$	—		$	10,993	$	10,993
	Total long-term investments		$	—		$	—		$	10,993	$	10,993
	Other assets, net:
	Derivative instruments		$	—		$	172		$	—	$	172
	Total		$	—		$	172		$	—	$	172
	Total		$	17,320		$	254,828		$	10,993	$	283,141
	Liabilities:
	Accrued expenses:
	Contingent consideration		$	—		$	—		$	3,202	$	3,202
	Other non-current liabilities:
	Contingent consideration		$	—		$	—		$	8,753	$	8,753
	Total		$	—		$	—		$	11,955	$	11,955
			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
Liabilities:
Other non-current liabilities:
Contingent consideration		$	—		$	—		$	12,919	$	12,919
Total		$	—		$	—		$	12,919	$	12,919
The Company’s cash equivalents and short-term investments that are classified as Level 1 are valued using quoted prices and other relevant information generated by market transactions involving identical assets. Cash equivalents and short-term investments classified as Level 2 are valued using non-binding market consensus prices that are corroborated with observable market data; quoted market prices for similar instruments in active markets; or pricing models, such as a discounted cash flow model, with all significant inputs derived from or corroborated with observable market data. Investments classified as Level 3 are valued using a discounted cash flow model. The assumptions used in preparing the discounted cash flow model include estimates for interest rates, amount of cash flows, expected holding periods of the securities and a discount to reflect the Company’s inability to liquidate the securities. The Company’s derivative instruments are valued using 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
June 28, 2014							Average
(000s)
$	10,993		Discounted cash flow		Estimated yield		0.98%
					Expected holding period		10 years
					Estimated discount rate		3.48%
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
June 28, 2014
(000s)
$	11,955		Monte Carlo simulation		Expected revenue growth rate		19.7% – 40.9%
					Expected revenue volatility		20.00%
					Expected term		0.5 years – 4.5 years
					Estimated discount rate		0.0% – 1.7%
The Company has followed an established internal control procedure used in valuing contingent consideration. The valuation of contingent consideration for the Energy Micro acquisition is based on 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 three and six months ended June 28, 2014 (in thousands):
Assets
Auction Rate Securities		Three Months			Six Months
		Ended			Ended
Beginning balance		$	10,997		$	10,632
Gain (loss) included in other comprehensive income (loss)		(4		)	361
Balance at June 28, 2014		$	10,993		$	10,993
Liabilities
Contingent Consideration (1)		Three Months			Six Months
		Ended			Ended
Beginning balance		$	13,256		$	12,919
Gain recognized in earnings (2)		(1,301		)	(964		)
Balance at June 28, 2014		$	11,955		$	11,955
Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:		$	1,301		$	964
(1)     In connection with the acquisition of Energy Micro, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation model are recorded in selling, general and administrative expenses in the Consolidated Statement of Income.
(2)     The Company decreased the estimated fair value of contingent consideration because the Company now expects a lower level of earn-out achievement.
Fair values of other financial instruments
The Company’s Term Loan Facility bears interest at LIBOR plus an applicable margin. The fair value of the Company’s Term Loan Facility approximates its carrying values as of June 28, 2014 and December 28, 2013, 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	6 Months Ended
	Jun. 28, 2014
Balance Sheet Details	'
Balance Sheet Details	'
	6. Balance Sheet Details
	The following shows the details of selected Condensed Consolidated Balance Sheet items (in thousands):
	Inventories
		June 28,		December 28,
		2014		2013
	Work in progress	$	34,461	$	34,503
	Finished goods	11,096		10,768
		$	45,557	$	45,271

Debt

Debt	6 Months Ended
	Jun. 28, 2014
Debt	'
Debt	'
	7. Debt
	On July 31, 2012, the Company and certain of its domestic subsidiaries (the “Guarantors”) entered into a $230 million five-year Credit Agreement (the “Agreement”). The Agreement consists of a $100 million Term Loan Facility and a $130 million Revolving Credit Facility (collectively, the “Credit Facilities”).
	The Term Loan Facility provides for quarterly principal amortization (equal to 5% of the principal in each of the first two years and 10% of the principal in each of the next three years) with the remaining balance payable upon the maturity date. The Revolving Credit Facility includes a $25 million letter of credit sublimit and a $10 million swingline loan sublimit. The Company has an option to increase the size of the Revolving Credit Facility by up to an aggregate of $50 million in additional commitments, subject to certain conditions. On September 27, 2012, the Company borrowed $100 million under the Term Loan Facility. To date, the Company has not borrowed under the Revolving Credit Facility.
	The Term Loan Facility and Revolving Credit Facility, other than swingline loans, will bear interest at LIBOR plus an applicable margin or, at the option of the Company, a base rate (defined as the highest of the Bank of America prime rate, the Federal Funds rate plus 0.50% and a daily rate equal to one-month LIBOR plus 1.00%) plus an applicable margin. Swingline loans accrue interest at the base rate plus the applicable margin for base rate loans. The applicable margins for the LIBOR rate loans range from 1.50% to 2.50% and for base rate loans range from 0.50% to 1.50%, depending in each case, on the leverage ratio as defined in the Agreement. The Company also pays a commitment fee on the unused amount of the Revolving Credit Facility.
	In connection with the closing of the Credit Agreement, the Company entered into a security and pledge agreement. Under the security and pledge agreement, the Company pledged equity securities of certain of its subsidiaries, subject to exceptions and limitations. The Credit Facilities contain various conditions, covenants and representations with which the Company must be in compliance in order to borrow funds and to avoid an event of default, including financial covenants that the Company must maintain a leverage ratio (funded debt/EBITDA) of no more than 2.5 to 1 and a minimum fixed charge coverage ratio (EBITDA/debt payments, income taxes and capital expenditures) of no less than 1.50 to 1. As of June 28, 2014, the Company was in compliance with all covenants of the Credit Facilities.
	As of June 28, 2014, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):
	Fiscal Year
	2014	$	5,000
	2015	10,000
	2016	10,000
	2017	67,500
	Total	$	92,500
	Interest Rate Swap Agreement
	In connection with the $100 million borrowed under the Term Loan Facility, the Company entered into an interest rate swap agreement as a hedge against the LIBOR portion of such variable interest payments. Under the terms of the swap agreement, the Company effectively converted the LIBOR portion of the interest on the Term Loan Facility to a fixed interest rate of 0.764% through the maturity date. As of June 28, 2014, the combined interest rate on the Term Loan Facility (which includes an applicable margin) was 2.514%. See Note 4, Derivative Financial Instruments, for additional information.

Stockholders_Equity

Stockholders' Equity	6 Months Ended
	Jun. 28, 2014
Stockholders' Equity	'
Stockholders' Equity	'
	8. Stockholders’ Equity
	Common Stock
	The Company issued 0.9 million shares of common stock during the six months ended June 28, 2014.
	Share Repurchase Programs
	The Board of Directors authorized the following share repurchase programs (in thousands):
	Program Authorization Date	Program		Program
		Termination		Amount
		Date
	January 2014	January 2015		$	100,000
	January 2013	January 2014		$	50,000
	April 2012	January 2013		$	100,000
	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 0.2 million shares of its common stock for $11.0 million during the six months ended June 28, 2014. These shares were retired upon repurchase. The Company did not repurchase any shares of its common stock during the six months ended June 29, 2013.
	Accumulated Other Comprehensive Loss
	The components of accumulated other comprehensive loss, net of taxes, were as follows (in thousands):
		Unrealized Gain			Net Unrealized Losses			Total
		on Cash Flow			on Available-For-Sale
		Hedge			Securities
	Balance at December 28, 2013	$	333		$	(1,017	)	$	(684	)
	Other comprehensive income (loss) before reclassifications	(407		)	306			(101		)
	Amount reclassified from accumulated other comprehensive loss	186			—			186
	Net change for the period	(221		)	306			85
	Balance at June 28, 2014	$	112		$	(711	)	$	(599	)
	Reclassifications From Accumulated Other Comprehensive Loss
		Three Months Ended						Six Months Ended
	Reclassification (in thousands)	June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Losses on cash flow hedges to:
	Interest expense	$	(143	)	$	(141	)	$	(286	)	$	(322	)
	Gains on available-for-sales securities to:
	Interest income	—			232			—			232
		(143		)	91			(286		)	(90		)
	Income tax (provision) benefit	50			(32		)	100			32
	Total reclassifications	$	(93	)	$	59		$	(186	)	$	(58	)

StockBased_Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 28, 2014
Stock-Based Compensation	'
Stock-Based Compensation	'
	9. Stock-Based Compensation
	In fiscal 2009, the stockholders of the Company approved the 2009 Stock Incentive Plan (the “2009 Plan”) and the 2009 Employee Stock Purchase Plan (the “2009 Purchase Plan”). On April 15, 2014, the stockholders of the Company approved amendments to both the 2009 Plan and the 2009 Purchase Plan. The amendments authorized additional shares of common stock for issuance, to comply with changes in applicable law, improve the Company’s corporate governance and to implement other best practices. The amended plans are currently effective.
	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 restricted stock units (RSUs) equal their intrinsic value on the date of grant. The fair values of market stock units (MSUs) generally are estimated using a Monte Carlo simulation based on the date of grant.
	The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income (in thousands):
		Three Months Ended				Six Months Ended
		June 28,		June 29,		June 28,		June 29,
		2014		2013		2014		2013
	Cost of revenues	$	178	$	263	$	374	$	517
	Research and development	4,327		3,483		8,568		6,821
	Selling, general and administrative	4,777		3,678		9,617		6,346
		9,282		7,424		18,559		13,684
	Income tax benefit	587		170		1,898		918
		$	8,695	$	7,254	$	16,661	$	12,766
	The increase in stock-based compensation costs in the recent three and six month periods was principally due to increased headcount. The Company had approximately $67.9 million of total unrecognized compensation costs related to granted stock awards as of June 28, 2014 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.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 28, 2014
Commitments and Contingencies	'
Commitments and Contingencies	'
	10.  Commitments and Contingencies
	Patent Litigation
	On January 21, 2014, Cresta Technology Corporation (“Cresta Technology”), a Delaware corporation, filed a lawsuit against the Company, Samsung Electronics Co., Ltd., Samsung Electronics America, Inc., LG Electronics Inc. and LG Electronics U.S.A., Inc. in the United States District Court in the District of Delaware, alleging infringement of United States Patent Nos. 7,075,585, 7,265,792 and 7,251,466. The lawsuit relates to the Company’s family of television tuner products.  Cresta Technology seeks unspecified compensatory and enhanced damages, attorney fees and a permanent injunction. On January 28, 2014, Cresta Technology also filed a complaint with the United States International Trade Commission (“ITC”) alleging infringement of the same patents against the Company, Samsung and LG Electronics and seeking to prevent the importation and sale of allegedly infringing products in the United States. The ITC instituted an investigation based on Cresta Technology’s complaint on February 27, 2014. The Delaware District Court action has been stayed pending completion of the proceedings in the ITC. The Company intends to vigorously defend against these allegations.
	On April 11, 2014, the Company filed a lawsuit against Cresta Technology in the United States District Court in the Western District of Texas, Austin Division, alleging infringement of United States Patent Nos. 6,308,055, 6,965,761 and 7,353,011. On July 14, 2014, the Court dismissed the lawsuit without prejudice due to the lack of commercial activity by Cresta Technology in the Western District of Texas. On July 16, 2014, the Company refiled its claims for the ‘055, ‘761 and ‘011 patents in a lawsuit in the United States District Court in the Northern District of California. In addition, the Company added additional claims alleging infringement of United States Patent Nos. 6,304,146, 6,137,372 and 6,233,441. The Company is seeking a permanent injunction stopping the sale of all allegedly infringing Cresta Technology products and an award of damages and attorney fees.
	On May 6, 2014, the Company filed a complaint with the ITC alleging infringement of United States Patent Nos. 6,137,372 and 6,233,441 against Cresta Technology, Hauppauge Digital, Inc., Hauppague Computer Works, Inc., PCTV Systems, S.a.r.l., Luxembourg and PCTV Systems S.a.r.l., seeking to prevent the importation and sale of allegedly infringing products in the United States. On June 6, 2014, the ITC instituted an investigation based on the Company’s complaint. On June 13, 2014, Cresta Technology proposed a consent order whereby Cresta Technology will not sell for importation, import or sell in the United States television tuners that infringe the patent claims asserted by the Company. On July 1, 2014, the Administrative Law Judge accepted the proposed consent order and issued an Initial Determination terminating the investigation based on the Company’s complaint against Cresta Technology.
	At this time, the Company cannot predict the outcome of these matters or the resulting financial impact to it, if any.
	Other
	The Company is involved in various other legal proceedings that have arisen in the normal course of business. While the ultimate results of these matters cannot be predicted with certainty, the Company does not expect them to have a material adverse effect on its consolidated financial statements.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 28, 2014
Income Taxes	'
Income Taxes	'
	11. Income Taxes
	Provision for income taxes includes both domestic and foreign income taxes at the applicable statutory rates adjusted for non-deductible expenses, research and development tax credits and other permanent differences. Income tax expense was $5.9 million for the three months ended June 28, 2014 and June 29, 2013, resulting in effective tax rates of 29.4% and 31.7%, respectively. Income tax expense was $7.4 million and $5.9 million for the six months ended June 28, 2014 and June 29, 2013, respectively, resulting in effective tax rates of 24.9% and 15.3%, respectively. The effective tax rate for the three months ended June 28, 2014 decreased from the prior period, primarily due to the recording of a valuation allowance in the prior period related to deferred tax assets for state net operating losses and research and development tax credits. This decrease was partially offset by the non-renewal of the 2014 federal research and development tax credit in the current period. The effective tax rate for the six months ended June 28, 2014 increased from the prior period, primarily due to the prior period recognition of the 2012 federal research and development tax credit due to the enactment of the American Taxpayer Relief Act of 2012 on January 2, 2013, as well as the non-renewal of the 2014 federal research and development tax credit in the current period. This increase was partially offset by the release in the current period of prior year unrecognized tax benefits due to the lapse of the statute of limitations applicable to a tax deduction claimed on a prior year foreign tax return.
	At June 28, 2014, the Company had gross unrecognized tax benefits of $3.5 million, $3.5 million of which would affect the effective tax rate if recognized. The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes. The Company had a gross decrease of $1.5 million to its prior year unrecognized tax benefits related the lapse of the statute of limitations applicable to an uncertain tax position during the six months ended June 28, 2014, a portion of which represented a foreign currency remeasurement adjustment and was recognized in other income (expense), net.
	The tax years 2009 through 2014 remain open to examination by the major taxing jurisdictions to which the Company is subject.  The Company is not currently under audit in any major taxing jurisdiction.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 28, 2014
Significant Accounting Policies	'
Revenue Recognition	'
	Revenue Recognition
	Revenues are generated predominately by sales of the Company’s integrated circuits (ICs). The Company recognizes revenue when all of the following criteria are met: 1) there is persuasive evidence that an arrangement exists, 2) delivery of goods has occurred, 3) the sales price is fixed or determinable, and 4) collectibility is reasonably assured. Generally, revenue from product sales to direct customers and contract manufacturers is recognized upon shipment.
	A portion of the Company’s sales are made to distributors under agreements allowing certain rights of return and price protection related to the final selling price to the end customers. Accordingly, the Company defers revenue and cost of revenue on such sales until the distributors sell the product to the end customers. The net balance of deferred revenue less deferred cost of revenue associated with inventory shipped to a distributor but not yet sold to an end customer is recorded in the deferred income on shipments to distributors liability on the Consolidated Balance Sheet. Such net deferred income balance reflects the Company’s estimate of the impact of rights of return and price protection.
	A small portion of the Company’s revenues is derived from the sale of patents and royalties generated from patent license agreements. The above revenue recognition criteria for patent sales are generally met upon the execution of the patent sale agreement. Royalty revenues are recognized based on royalties reported by licensees and when other revenue recognition criteria are met, which is generally a quarter in arrears from the period earned.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 28, 2014
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):
		Three Months Ended				Six Months Ended
		June 28,		June 29,		June 28,		June 29,
		2014		2013		2014		2013
	Net income	$	14,279	$	12,612	$	22,389	$	32,646
	Shares used in computing basic earnings per share	43,462		42,552		43,271		42,370
	Effect of dilutive securities:
	Stock options and other stock-based awards	756		717		866		821
	Shares used in computing diluted earnings per share	44,218		43,269		44,137		43,191
	Earnings per share:
	Basic	$	0.33	$	0.3	$	0.52	$	0.77
	Diluted	$	0.32	$	0.29	$	0.51	$	0.76

Cash_Cash_Equivalents_and_Inve1

Cash, Cash Equivalents and Investments (Tables)	6 Months Ended
	Jun. 28, 2014
Cash, Cash Equivalents and Investments	'
Schedule of cash, cash equivalents, and investments	'
	The Company’s cash, cash equivalents and investments consist of the following (in thousands):
		June 28, 2014
		Cost		Gross			Gross		Fair Value
				Unrealized			Unrealized
				Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand	$	56,959	$	—		$	—	$	56,959
	Available-for-sale securities:
	Money market funds	16,670		—			—		16,670
	Commercial paper	13,446		—			—		13,446
	Certificates of deposit	5,315		—			—		5,315
	Municipal bonds	900		—			—		900
	Total available-for-sale securities	36,331		—			—		36,331
	Total cash and cash equivalents	$	93,290	$	—		$	—	$	93,290
	Short-term Investments:
	Available-for-sale securities:
	Municipal bonds	$	157,600	$	(2	)	$	290	$	157,888
	Corporate bonds	32,470		(15		)	67		32,522
	Variable-rate demand notes	29,645		—			—		29,645
	Commercial paper	6,542		—			—		6,542
	Asset-backed securities	4,410		(3		)	2		4,409
	International government bonds	2,539		(1		)	1		2,539
	Certificates of deposit	850		—			—		850
	U.S. government bonds	650		—			—		650
	U.S. government agency	601		(1		)	—		600
	Total short-term investments	$	235,307	$	(22	)	$	360	$	235,645
	Long-term Investments:
	Available-for-sale securities:
	Auction rate securities	$	12,425	$	(1,432	)	$	—	$	10,993
	Total long-term investments	$	12,425	$	(1,432	)	$	—	$	10,993
		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
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 June 28, 2014	Fair		Gross			Fair		Gross			Fair		Gross
		Value		Unrealized			Value		Unrealized			Value		Unrealized
				Losses					Losses					Losses
	Auction rate securities	$	—	$	—		$	10,993	$	(1,432	)	$	10,993	$	(1,432	)
	Corporate bonds	10,992		(15		)	—		—			10,992		(15		)
	Municipal bonds	8,154		(2		)	—		—			8,154		(2		)
	Asset-backed securities	2,791		(3		)	—		—			2,791		(3		)
	International government bond	1,471		(1		)	—		—			1,471		(1		)
	U.S. government agency	600		(1		)	—		—			600		(1		)
		$	24,008	$	(22	)	$	10,993	$	(1,432	)	$	35,001	$	(1,454	)
		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	)
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 June 28, 2014 (in thousands):
		Cost		Fair
				Value
	Due in one year or less	$	128,339	$	128,444
	Due after one year through ten years	116,829		117,062
	Due after ten years	38,895		37,463
		$	284,063	$	282,969

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 28, 2014
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		June 28,			December 28,
				2014			2013
	Interest rate swap	Other assets, net		$	172		$	513
Schedule of before-tax effect of derivative instruments in cash flow hedging relationships	'
	The before-tax effect of derivative instruments in cash flow hedging relationships was as follows (in thousands):
		Gain (Loss) Recognized							Loss Reclassified
		in OCI on Derivatives							from Accumulated
		(Effective Portion)							OCI into Income
		during the:							(Effective Portion)
									during the:
		Three Months Ended						Location of Loss	Three Months Ended
		June 28,			June 29,			Reclassified into	June 28,			June 29,
		2014			2013			Income	2014			2013
	Interest rate swaps	$	(486	)	$	1,101		Interest expense	$	(143	)	$	(141	)
		Six Months Ended							Six Months Ended
		June 28,			June 29,				June 28,			June 29,
		2014			2013				2014			2013
	Interest rate swaps	$	(627	)	$	1,144		Interest expense	$	(286	)	$	(322	)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 28, 2014
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). 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 June 28, 2014 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		$	16,670		$	—		$	—	$	16,670
	Commercial paper		—			13,446			—		13,446
	Certificates of deposit		—			5,315			—		5,315
	Municipal bonds		—			900			—		900
	Total cash equivalents		$	16,670		$	19,661		$	—	$	36,331
	Short-term Investments:
	Municipal bonds		$	—		$	157,888		$	—	$	157,888
	Corporate bonds		—			32,522			—		32,522
	Variable-rate demand notes		—			29,645			—		29,645
	Commercial paper		—			6,542			—		6,542
	Asset-backed securities		—			4,409			—		4,409
	International government bonds		—			2,539			—		2,539
	Certificates of deposit		—			850			—		850
	U.S. government bond		650			—			—		650
	U.S. government agency		—			600			—		600
	Total short-term investments		$	650		$	234,995		$	—	$	235,645
	Long-term Investments:
	Auction rate securities		$	—		$	—		$	10,993	$	10,993
	Total long-term investments		$	—		$	—		$	10,993	$	10,993
	Other assets, net:
	Derivative instruments		$	—		$	172		$	—	$	172
	Total		$	—		$	172		$	—	$	172
	Total		$	17,320		$	254,828		$	10,993	$	283,141
	Liabilities:
	Accrued expenses:
	Contingent consideration		$	—		$	—		$	3,202	$	3,202
	Other non-current liabilities:
	Contingent consideration		$	—		$	—		$	8,753	$	8,753
	Total		$	—		$	—		$	11,955	$	11,955
			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
Liabilities:
Other non-current liabilities:
Contingent consideration		$	—		$	—		$	12,919	$	12,919
Total		$	—		$	—		$	12,919	$	12,919
Summary of quantitative information about level 3 asset fair value measurements	'
	Auction rate securities
	Fair Value at			Valuation Technique		Unobservable Input		Weighted
	June 28, 2014							Average
	(000s)
	$	10,993		Discounted cash flow		Estimated yield		0.98%
						Expected holding period		10 years
						Estimated discount rate		3.48%
Summary of quantitative information about level 3 liability fair value measurements	'
	Contingent consideration
	Fair Value at			Valuation Technique		Unobservable Input		Range
	June 28, 2014
	(000s)
	$	11,955		Monte Carlo simulation		Expected revenue growth rate		19.7% – 40.9%
						Expected revenue volatility		20.00%
						Expected term		0.5 years – 4.5 years
						Estimated discount rate		0.0% – 1.7%
Summary of activity in Level 3 financial instruments	'
	The following summarizes the activity in Level 3 financial instruments for the three and six months ended June 28, 2014 (in thousands):
	Assets
	Auction Rate Securities		Three Months			Six Months
			Ended			Ended
	Beginning balance		$	10,997		$	10,632
	Gain (loss) included in other comprehensive income (loss)		(4		)	361
	Balance at June 28, 2014		$	10,993		$	10,993
	Liabilities
	Contingent Consideration (1)		Three Months			Six Months
			Ended			Ended
	Beginning balance		$	13,256		$	12,919
	Gain recognized in earnings (2)		(1,301		)	(964		)
	Balance at June 28, 2014		$	11,955		$	11,955
	Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:		$	1,301		$	964
	(1)     In connection with the acquisition of Energy Micro, the Company recorded contingent consideration based upon the expected achievement of certain milestone goals. Changes to the fair value of contingent consideration due to changes in assumptions used in preparing the valuation model are recorded in selling, general and administrative expenses in the Consolidated Statement of Income.
	(2)     The Company decreased the estimated fair value of contingent consideration because the Company now expects a lower level of earn-out achievement.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	6 Months Ended
	Jun. 28, 2014
Balance Sheet Details	'
Inventories	'
	The following shows the details of selected Condensed Consolidated Balance Sheet items (in thousands):
	Inventories
		June 28,		December 28,
		2014		2013
	Work in progress	$	34,461	$	34,503
	Finished goods	11,096		10,768
		$	45,557	$	45,271

Debt_Tables

Debt (Tables)	6 Months Ended
	Jun. 28, 2014
Debt	'
Schedule of remaining contractual maturities of the Term Loan Facility	'
	As of June 28, 2014, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):
	Fiscal Year
	2014	$	5,000
	2015	10,000
	2016	10,000
	2017	67,500
	Total	$	92,500

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 28, 2014
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
	January 2014	January 2015		$	100,000
	January 2013	January 2014		$	50,000
	April 2012	January 2013		$	100,000
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 Losses			Total
		on Cash Flow			on Available-For-Sale
		Hedge			Securities
	Balance at December 28, 2013	$	333		$	(1,017	)	$	(684	)
	Other comprehensive income (loss) before reclassifications	(407		)	306			(101		)
	Amount reclassified from accumulated other comprehensive loss	186			—			186
	Net change for the period	(221		)	306			85
	Balance at June 28, 2014	$	112		$	(711	)	$	(599	)
Schedule of Reclassifications From Accumulated Other Comprehensive Loss	'
		Three Months Ended						Six Months Ended
	Reclassification (in thousands)	June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Losses on cash flow hedges to:
	Interest expense	$	(143	)	$	(141	)	$	(286	)	$	(322	)
	Gains on available-for-sales securities to:
	Interest income	—			232			—			232
		(143		)	91			(286		)	(90		)
	Income tax (provision) benefit	50			(32		)	100			32
	Total reclassifications	$	(93	)	$	59		$	(186	)	$	(58	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 28, 2014
Stock-Based Compensation	'
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 Condensed Consolidated Statements of Income (in thousands):
		Three Months Ended				Six Months Ended
		June 28,		June 29,		June 28,		June 29,
		2014		2013		2014		2013
	Cost of revenues	$	178	$	263	$	374	$	517
	Research and development	4,327		3,483		8,568		6,821
	Selling, general and administrative	4,777		3,678		9,617		6,346
		9,282		7,424		18,559		13,684
	Income tax benefit	587		170		1,898		918
		$	8,695	$	7,254	$	16,661	$	12,766

Significant_Accounting_Policie2

Significant Accounting Policies (Details)	6 Months Ended	12 Months Ended
	Jun. 28, 2014	Dec. 28, 2013
Basis of Presentation and Principles of Consolidation	'	'
Length of fiscal year	'371 days	'364 days
Number of days in each fiscal quarter for 52-week fiscal year	'91 days	'
Minimum	'	'
Basis of Presentation and Principles of Consolidation	'	'
Length of fiscal year	'364 days	'
Maximum	'	'
Basis of Presentation and Principles of Consolidation	'	'
Length of fiscal year	'371 days	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Earnings Per Share	'	'	'	'
Net income	$14,279	$12,612	$22,389	$32,646
Shares used in computing basic earnings per share	43,462,000	42,552,000	43,271,000	42,370,000
Effect of dilutive securities:	'	'	'	'
Stock options and other stock-based awards (in shares)	756,000	717,000	866,000	821,000
Shares used in computing diluted earnings per share	44,218,000	43,269,000	44,137,000	43,191,000
Earnings per share:	'	'	'	'
Basic (in dollars per share)	$0.33	$0.30	$0.52	$0.77
Diluted (in dollars per share)	$0.32	$0.29	$0.51	$0.76
Shares excluded from computation of diluted earning per share	100,000	500,000	200,000	400,000

Cash_Cash_Equivalents_and_Inve2

Cash, Cash Equivalents and Investments (Details) (USD $)	6 Months Ended
	Jun. 28, 2014	Dec. 28, 2013
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	56,959,000	45,544,000
Cash on hand, Fair Value	56,959,000	45,544,000
Cash and cash equivalents, Cost	93,290,000	95,800,000
Cash and cash equivalents, Fair Value	93,290,000	95,800,000
Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	36,331,000	50,256,000
Available-for-sale securities, Fair Value	36,331,000	50,256,000
Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	235,307,000	179,365,000
Available-for-sale securities, Gross Unrealized Losses	-22,000	-15,000
Available-for-sale securities, Gross Unrealized Gains	360,000	243,000
Available-for-sale securities, Fair Value	235,645,000	179,593,000
Long-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	12,425,000	12,425,000
Available-for-sale securities, Gross Unrealized Losses	-1,432,000	-1,793,000
Available-for-sale securities, Fair Value	10,993,000	10,632,000
Money market funds | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	16,670,000	39,538,000
Available-for-sale securities, Fair Value	16,670,000	39,538,000
Commercial paper | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	13,446,000	2,499,000
Available-for-sale securities, Fair Value	13,446,000	2,499,000
Commercial paper | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	6,542,000	3,748,000
Available-for-sale securities, Fair Value	6,542,000	3,748,000
Certificates of deposit | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	5,315,000	7,768,000
Available-for-sale securities, Fair Value	5,315,000	7,768,000
Certificates of deposit | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	850,000	'
Available-for-sale securities, Fair Value	850,000	'
Municipal bonds | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	900,000	451,000
Available-for-sale securities, Fair Value	900,000	451,000
Municipal bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	157,600,000	119,289,000
Available-for-sale securities, Gross Unrealized Losses	-2,000	-11,000
Available-for-sale securities, Gross Unrealized Gains	290,000	182,000
Available-for-sale securities, Fair Value	157,888,000	119,460,000
Corporate bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	32,470,000	17,788,000
Available-for-sale securities, Gross Unrealized Losses	-15,000	-4,000
Available-for-sale securities, Gross Unrealized Gains	67,000	60,000
Available-for-sale securities, Fair Value	32,522,000	17,844,000
Variable-rate demand notes | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	29,645,000	38,025,000
Available-for-sale securities, Fair Value	29,645,000	38,025,000
Asset-backed securities | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	4,410,000	515,000
Available-for-sale securities, Gross Unrealized Losses	-3,000	'
Available-for-sale securities, Gross Unrealized Gains	2,000	1,000
Available-for-sale securities, Fair Value	4,409,000	516,000
International government bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	2,539,000	'
Available-for-sale securities, Gross Unrealized Losses	-1,000	'
Available-for-sale securities, Gross Unrealized Gains	1,000	'
Available-for-sale securities, Fair Value	2,539,000	'
U.S. government bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	650,000	'
Available-for-sale securities, Fair Value	650,000	'
U.S. government agency | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	601,000	'
Available-for-sale securities, Gross Unrealized Losses	-1,000	'
Available-for-sale securities, Fair Value	600,000	'
Auction rate securities | Long-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	12,425,000	12,425,000
Available-for-sale securities, Gross Unrealized Losses	-1,432,000	-1,793,000
Available-for-sale securities, Fair Value	$10,993,000	$10,632,000

Cash_Cash_Equivalents_and_Inve3

Cash, Cash Equivalents and Investments (Details 2) (USD $)	Jun. 28, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	$24,008	$13,684
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	10,993	10,632
Total fair value of available-for-sale securities, continuous loss position	35,001	24,316
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-22	-15
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,432	-1,793
Available-for-sale securities, total gross unrealized losses	-1,454	-1,808
Cost	'	'
Due in one year or less, Cost	128,339	'
Due after one year through ten years, Cost	116,829	'
Due after ten years, Cost	38,895	'
Total Cost	284,063	'
Fair Value	'	'
Due in one year or less, Fair Value	128,444	'
Due after one year through ten years, Fair Value	117,062	'
Due after ten years, Fair Value	37,463	'
Total Fair Value	282,969	'
Municipal bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	8,154	11,079
Total fair value of available-for-sale securities, continuous loss position	8,154	11,079
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-2	-11
Available-for-sale securities, total gross unrealized losses	-2	-11
Auction rate securities	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	10,993	10,632
Total fair value of available-for-sale securities, continuous loss position	10,993	10,632
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,432	-1,793
Available-for-sale securities, total gross unrealized losses	-1,432	-1,793
Corporate bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	10,992	2,605
Total fair value of available-for-sale securities, continuous loss position	10,992	2,605
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-15	-4
Available-for-sale securities, total gross unrealized losses	-15	-4
Asset-backed securities	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	2,791	'
Total fair value of available-for-sale securities, continuous loss position	2,791	'
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-3	'
Available-for-sale securities, total gross unrealized losses	-3	'
International government bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	1,471	'
Total fair value of available-for-sale securities, continuous loss position	1,471	'
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-1	'
Available-for-sale securities, total gross unrealized losses	-1	'
U.S. government agency	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	600	'
Total fair value of available-for-sale securities, continuous loss position	600	'
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-1	'
Available-for-sale securities, total gross unrealized losses	($1)	'

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (Cash flow hedges, Interest rate swaps, USD $)	Jun. 28, 2014
In Millions, unless otherwise specified
Cash flow hedges | Interest rate swaps	'
Notional amount	'
Original notional value	$100

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)	6 Months Ended
	Jun. 28, 2014	Jun. 28, 2014	Dec. 28, 2013
		Other assets, net	Other assets, net
Derivative Financial Instruments	'	'	'
Description of variable rate	'LIBOR	'	'
Gains or losses from the hedging instrument which was excluded from the assessment of effectiveness	$0	'	'
Derivative financial instrument	'	'	'
Fair value of interest rate swap	'	$172,000	$513,000

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Derivative Instruments, Gain (Loss)	'	'	'	'
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months	$500,000	'	$500,000	'
Cash flow hedges | Interest rate swaps	'	'	'	'
Derivative Instruments, Gain (Loss)	'	'	'	'
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period	-486,000	1,101,000	-627,000	1,144,000
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	($143,000)	($141,000)	($286,000)	($322,000)

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Jun. 28, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	$93,290	$95,800
Total short-term investments	235,645	179,593
Total long-term investments	10,993	10,632
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	16,670	39,538
Total short-term investments	650	'
Total assets at fair value	17,320	39,538
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	16,670	39,538
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	650	'
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	19,661	10,718
Total short-term investments	234,995	179,593
Derivative instruments	172	513
Other assets, net	172	513
Total assets at fair value	254,828	190,824
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	13,446	2,499
Total short-term investments	6,542	3,748
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	5,315	7,768
Total short-term investments	850	'
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	900	451
Total short-term investments	157,888	119,460
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	32,522	17,844
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Variable-rate demand notes	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	29,645	38,025
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	4,409	516
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | International government bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	2,539	'
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government agency	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	600	'
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	10,993	10,632
Total assets at fair value	10,993	10,632
Total liabilities at fair value	11,955	12,919
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Accrued expenses:	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Contingent consideration	3,202	'
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Other non-current liabilities:	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Contingent consideration	8,753	12,919
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate securities	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total long-term investments	10,993	10,632
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	36,331	50,256
Total short-term investments	235,645	179,593
Total long-term investments	10,993	10,632
Derivative instruments	172	513
Other assets, net	172	513
Total assets at fair value	283,141	240,994
Total liabilities at fair value	11,955	12,919
Assets and liabilities measured at fair value on recurring basis | Fair Value | Accrued expenses:	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Contingent consideration	3,202	'
Assets and liabilities measured at fair value on recurring basis | Fair Value | Other non-current liabilities:	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Contingent consideration	8,753	12,919
Assets and liabilities measured at fair value on recurring basis | Fair Value | Money market funds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	16,670	39,538
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	13,446	2,499
Total short-term investments	6,542	3,748
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	5,315	7,768
Total short-term investments	850	'
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	900	451
Total short-term investments	157,888	119,460
Assets and liabilities measured at fair value on recurring basis | Fair Value | Corporate bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	32,522	17,844
Assets and liabilities measured at fair value on recurring basis | Fair Value | Variable-rate demand notes	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	29,645	38,025
Assets and liabilities measured at fair value on recurring basis | Fair Value | Asset-backed securities	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	4,409	516
Assets and liabilities measured at fair value on recurring basis | Fair Value | International government bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	2,539	'
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	650	'
Assets and liabilities measured at fair value on recurring basis | Fair Value | U.S. government agency	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total short-term investments	600	'
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	$10,993	$10,632

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Details 2) (Auction rate securities, Weighted Average, Discounted cash flow)	6 Months Ended
	Jun. 28, 2014
Auction rate securities | Weighted Average | Discounted cash flow	'
Quantitative information for Level 3 Fair Value Measurements Assets	'
Estimated yield (as a percent)	0.98%
Expected holding period	'10 years
Estimated discount rate (as a percent)	3.48%

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Details 3) (Contingent consideration, Monte Carlo simulation)	6 Months Ended
	Jun. 28, 2014
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)	19.70%
Expected term	'6 months
Estimated discount rate (as a percent)	0.00%
High end of range	'
Quantitative information for Level 3 fair value measurements liabilities	'
Expected revenue growth rate (as a percent)	40.90%
Expected term	'4 years 6 months
Estimated discount rate (as a percent)	1.70%

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 $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 28, 2014
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	$10,997	$10,632
Gain (loss) included in other comprehensive income (loss)	-4	361
Balance at the end of the period	$10,993	$10,993

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 $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 28, 2014
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	$13,256	$12,919
Gain recognized in earnings	-1,301	-964
Balance at the end of the period	11,955	11,955
Net gain for the period included in earnings attributable to contingent consideration held at the end of the period:	$1,301	$964

Balance_Sheet_Details_Details

Balance Sheet Details (Details) (USD $)	Jun. 28, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Inventories	'	'
Work in progress	$34,461	$34,503
Finished goods	11,096	10,768
Total inventories	$45,557	$45,271

Debt_Details

Debt (Details) (USD $)

1 Months Ended

1 Months Ended

6 Months Ended

6 Months Ended

Jul. 31, 2012

Jun. 28, 2014

Sep. 27, 2012

Jul. 31, 2012

Jun. 28, 2014

Jul. 31, 2012

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Jun. 28, 2014

Term Loan Facility

Term Loan Facility

Term Loan Facility

Agreement

Agreement

Revolving Credit Facility

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

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

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

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

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

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

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

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

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

LIBOR

LIBOR

LIBOR

Prime Rate

Federal Funds

one-month LIBOR

Base rate

Base rate

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

'

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

'

67,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Total debt

'

$92,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended				1 Months Ended
Share data in Millions, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 28, 2014	Jan. 31, 2014	Jan. 31, 2013	Apr. 30, 2012
					Unrealized Gain on Cash Flow Hedge	Net Unrealized Losses on Available-For-Sale Securities	Maximum	Maximum	Maximum
Stockholders' Equity	'	'	'	'	'	'	'	'	'
Number of shares of common stock issued	'	'	0.9	'	'	'	'	'	'
Stockholders' Equity	'	'	'	'	'	'	'	'	'
Program Amount authorized to repurchase	'	'	'	'	'	'	$100,000,000	$50,000,000	$100,000,000
Components of accumulated other comprehensive loss, net of taxes	'	'	'	'	'	'	'	'	'
Balance at beginning of the period	'	'	-684,000	'	333,000	-1,017,000	'	'	'
Other comprehensive income (loss) before reclassifications	'	'	-101,000	'	-407,000	306,000	'	'	'
Amounts reclassified from accumulated other comprehensive loss	'	'	186,000	'	186,000	'	'	'	'
Other comprehensive income (loss)	-185,000	-54,000	85,000	17,000	-221,000	306,000	'	'	'
Balance at end of the period	-599,000	'	-599,000	'	112,000	-711,000	'	'	'
Repurchase of common stock (in shares)	'	'	0.2	'	'	'	'	'	'
Repurchase of common stock	'	'	$11,000,000	'	'	'	'	'	'

Stockholders_Equity_Details_2

Stockholders' Equity (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Amounts Reclassified from AOCI	'	'	'	'
Interest expense	($780)	($831)	($1,578)	($1,673)
Interest income	200	152	502	487
Income before income taxes	20,216	18,464	29,796	38,542
Income tax (provision) benefit	-5,937	-5,852	-7,407	-5,896
Net income	14,279	12,612	22,389	32,646
Reclassifications From Accumulated Other Comprehensive Loss	'	'	'	'
Amounts Reclassified from AOCI	'	'	'	'
Income before income taxes	-143	91	-286	-90
Income tax (provision) benefit	50	-32	100	32
Net income	-93	59	-186	-58
Losses on cash flow hedge | Reclassifications From Accumulated Other Comprehensive Loss	'	'	'	'
Amounts Reclassified from AOCI	'	'	'	'
Interest expense	-143	-141	-286	-322
Gains on available-for-sales securities | Reclassifications From Accumulated Other Comprehensive Loss	'	'	'	'
Amounts Reclassified from AOCI	'	'	'	'
Interest income	'	$232	'	$232

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Stock-based compensation costs	'	'	'	'
Share based compensation cost before tax	$9,282,000	$7,424,000	$18,559,000	$13,684,000
Income tax benefit	587,000	170,000	1,898,000	918,000
Share based compensation cost after tax	8,695,000	7,254,000	16,661,000	12,766,000
Total unrecognized compensation costs related to awards	67,900,000	'	67,900,000	'
Weighted-average period of recognition of unrecognized compensation costs	'	'	'2 years 1 month 6 days	'
Cost of revenues	'	'	'	'
Stock-based compensation costs	'	'	'	'
Share based compensation cost before tax	178,000	263,000	374,000	517,000
Research and development	'	'	'	'
Stock-based compensation costs	'	'	'	'
Share based compensation cost before tax	4,327,000	3,483,000	8,568,000	6,821,000
Selling, general and administrative	'	'	'	'
Stock-based compensation costs	'	'	'	'
Share based compensation cost before tax	$4,777,000	$3,678,000	$9,617,000	$6,346,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Taxes	'	'	'	'
Income tax expense	$5,937,000	$5,852,000	$7,407,000	$5,896,000
Effective income tax rate (as a percent)	29.40%	31.70%	24.90%	15.30%
Gross unrecognized tax benefits	3,500,000	'	3,500,000	'
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	3,500,000	'	3,500,000	'
Decrease in gross unrecognized tax benefits related the lapse of the statute of limitations applicable to an uncertain tax position	'	'	$1,500,000	'