Silicon Laboratories (SLAB) 10-Q 29 Apr 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 29, 2014	Apr. 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	29-Mar-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	'	43,453,373
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$128,323	$95,800
Short-term investments	194,765	179,593
Accounts receivable, net of allowances for doubtful accounts of $767 at March 29, 2014 and $797 at December 28, 2013	64,672	72,124
Inventories	44,334	45,271
Deferred income taxes	15,203	18,878
Prepaid expenses and other current assets	40,214	47,651
Total current assets	487,511	459,317
Long-term investments	10,997	10,632
Property and equipment, net	130,829	132,445
Goodwill	228,781	228,781
Other intangible assets, net	128,453	131,593
Other assets, net	23,482	28,382
Total assets	1,010,053	991,150
Current liabilities:	'	'
Accounts payable	22,707	22,126
Current portion of long-term debt	8,750	7,500
Accrued expenses	67,745	45,975
Deferred income on shipments to distributors	32,589	30,853
Income taxes	1,330	2,693
Total current liabilities	133,121	109,147
Long-term debt	85,000	87,500
Other non-current liabilities	30,737	55,941
Total liabilities	248,858	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; 43,433 and 42,779 shares issued and outstanding at March 29, 2014 and December 28, 2013, respectively	4	4
Additional paid-in capital	62,883	48,630
Retained earnings	698,722	690,612
Accumulated other comprehensive loss	-414	-684
Total stockholders' equity	761,195	738,562
Total liabilities and stockholders' equity	$1,010,053	$991,150

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 29, 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)	$767	$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	43,433	42,779
Common stock, shares outstanding	43,433	42,779

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Condensed Consolidated Statements of Income	'	'
Revenues	$145,691	$145,375
Cost of revenues	58,586	58,003
Gross margin	87,105	87,372
Operating expenses:	'	'
Research and development	42,485	37,582
Selling, general and administrative	34,611	29,153
Operating expenses	77,096	66,735
Operating income	10,009	20,637
Other income (expense):	'	'
Interest income	302	335
Interest expense	-798	-842
Other income (expense), net	67	-52
Income before income taxes	9,580	20,078
Provision for income taxes	1,470	44
Net income	$8,110	$20,034
Earnings per share:	'	'
Basic (in dollars per share)	$0.19	$0.47
Diluted (in dollars per share)	$0.18	$0.46
Weighted-average common shares outstanding:	'	'
Basic (in shares)	43,081	42,186
Diluted (in shares)	44,056	43,110

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Condensed Consolidated Statements of Comprehensive Income	'	'
Net income	$8,110	$20,034
Net changes to available-for-sale securities:	'	'
Unrealized gains (losses) arising during the period	413	-115
Net changes to cash flow hedges:	'	'
Unrealized gains (losses) arising during the period	-141	44
Reclassification for losses included in net income	143	181
Other comprehensive income, before tax	415	110
Provision for income taxes	145	39
Other comprehensive income	270	71
Comprehensive income	$8,380	$20,105

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Operating Activities	'	'
Net income	$8,110	$20,034
Adjustments to reconcile net income to cash provided by operating activities:	'	'
Depreciation of property and equipment	3,290	3,297
Amortization of other intangible assets and other assets	4,491	2,840
Stock-based compensation expense	9,277	6,260
Income tax benefit (shortfall) from stock-based awards	45	-363
Excess income tax benefit from stock-based awards	-235	-217
Deferred income taxes	6,784	7,521
Changes in operating assets and liabilities:	'	'
Accounts receivable	7,452	5,256
Inventories	1,083	-7,350
Prepaid expenses and other assets	14,266	4,620
Accounts payable	1,195	2,356
Accrued expenses	-2,218	-4,330
Deferred income on shipments to distributors	1,736	-598
Income taxes	-8,324	-9,818
Net cash provided by operating activities	46,952	29,508
Investing Activities	'	'
Purchases of available-for-sale investments	-43,366	-78,851
Proceeds from sales and maturities of available-for-sale investments	28,242	25,674
Purchases of property and equipment	-1,673	-3,898
Purchases of other assets	-2,113	-1,228
Net cash used in investing activities	-18,910	-58,303
Financing Activities	'	'
Proceeds from issuance of common stock, net of shares withheld for taxes	5,496	4,915
Excess income tax benefit from stock-based awards	235	217
Payments on debt	-1,250	-2,500
Net cash provided by financing activities	4,481	2,632
Increase (decrease) in cash and cash equivalents	32,523	-26,163
Cash and cash equivalents at beginning of period	95,800	105,426
Cash and cash equivalents at end of period	$128,323	$79,263

Significant_Accounting_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 29, 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 March 29, 2014 and December 28, 2013, the condensed consolidated results of its operations for the three months ended March 29, 2014 and March 30, 2013, the Condensed Consolidated Statements of Comprehensive Income for the three months ended March 29, 2014 and March 30, 2013, and the Condensed Consolidated Statements of Cash Flows for the three months ended March 29, 2014 and March 30, 2013. All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated results of operations for the three months ended March 29, 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 almost exclusively 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.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 29, 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
		March 29,		March 30,
		2014		2013
	Net income	$	8,110	$	20,034
	Shares used in computing basic earnings per share	43,081		42,186
	Effect of dilutive securities:
	Stock options and other stock-based awards	975		924
	Shares used in computing diluted earnings per share	44,056		43,110
	Earnings per share:
	Basic	$	0.19	$	0.47
	Diluted	$	0.18	$	0.46
	For the three months ended March 29, 2014 and March 30, 2013, approximately 0.2 million and 0.6 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	3 Months Ended
	Mar. 29, 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 March 29, 2014 consisted of municipal bonds, money market funds, variable-rate demand notes, corporate bonds, certificates of deposit and asset backed securities. The Company’s long-term investments consisted of auction-rate securities. In fiscal 2008, auctions for many of the Company’s auction-rate securities failed because sell orders exceeded buy orders. As of March 29, 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 March 29, 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 March 29, 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 March 29, 2014.
	The Company’s cash, cash equivalents and investments consist of the following (in thousands):
		March 29, 2014
		Cost		Gross			Gross		Fair Value
				Unrealized			Unrealized
				Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand	$	37,132	$	—		$	—	$	37,132
	Available-for-sale securities:
	Money market funds	85,070		—			—		85,070
	Certificates of deposit	6,121		—			—		6,121
	Total available-for-sale securities	91,191		—			—		91,191
	Total cash and cash equivalents	$	128,323	$	—		$	—	$	128,323
	Short-term Investments:
	Available-for-sale securities:
	Municipal bonds	$	133,965	$	(11	)	$	238	$	134,192
	Variable-rate demand notes	35,840		—			—		35,840
	Corporate bonds	23,776		(15		)	64		23,825
	Asset-backed securities	908		(1		)	1		908
	Total short-term investments	$	194,489	$	(27	)	$	303	$	194,765
	Long-term Investments:
	Available-for-sale securities:
	Auction rate securities	$	12,425	$	(1,428	)	$	—	$	10,997
	Total long-term investments	$	12,425	$	(1,428	)	$	—	$	10,997
		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 March 29, 2014	Fair		Gross			Fair		Gross			Fair		Gross
		Value		Unrealized			Value		Unrealized			Value		Unrealized
				Losses					Losses					Losses
	Auction rate securities	$	—	$	—		$	10,997	$	(1,428	)	$	10,997	$	(1,428	)
	Municipal bonds	10,662		(11		)	—		—			10,662		(11		)
	Corporate bonds	7,426		(15		)	—		—			7,426		(15		)
	Asset-backed securities	501		(1		)	—		—			501		(1		)
		$	18,589	$	(27	)	$	10,997	$	(1,428	)	$	29,586	$	(1,455	)
		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 March 29, 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 March 29, 2014 (in thousands):
	Cost		Fair
			Value
Due in one year or less	$	168,349	$	168,456
Due after one year through ten years	84,666		84,836
Due after ten years	45,090		43,661
	$	298,105	$	296,953

Derivative_Financial_Instrumen

Derivative Financial Instruments

3 Months Ended

Mar. 29, 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 March 29, 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

March 29,

December 28,

2014

2013

Interest rate swap

Other assets, net

$

514

$

513

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

Gain (Loss) Recognized in OCI

Location of Loss

Loss Reclassified

on Derivatives

Reclassified into

from Accumulated

(Effective Portion)

Income

OCI into Income

during the:

(Effective Portion)

during the:

Three Months Ended

Three Months Ended

March 29,

March 30,

March 29,

March 30,

2014

2013

2014

2013

Interest rate swaps

$

(141

)

$

44

Interest expense

$

(143

)

$

(181

)

The Company expects to reclassify $0.5 million of its interest rate swap losses included in accumulated other comprehensive loss as of March 29, 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	3 Months Ended
	Mar. 29, 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 March 29, 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		$	85,070	$	—		$	—	$	85,070
	Certificates of deposit		—		6,121			—		6,121
	Total cash equivalents		$	85,070	$	6,121		$	—	$	91,191
	Short-term Investments:
	Municipal bonds		$	—	$	134,192		$	—	$	134,192
	Variable-rate demand notes		—		35,840			—		35,840
	Corporate bonds		—		23,825			—		23,825
	Asset-backed securities		—		908			—		908
	Total short-term investments		$	—	$	194,765		$	—	$	194,765
	Long-term Investments:
	Auction rate securities		$	—	$	—		$	10,997	$	10,997
	Total long-term investments		$	—	$	—		$	10,997	$	10,997
	Other assets, net:
	Derivative instruments		$	—	$	514		$	—	$	514
	Total		$	—	$	514		$	—	$	514
	Total		$	85,070	$	201,400		$	10,997	$	297,467
	Liabilities:
	Accrued expenses:
	Contingent consideration		$	—	$	—		$	3,754	$	3,754
	Other non-current liabilities:
	Contingent consideration		$	—	$	—		$	9,502	$	9,502
	Total		$	—	$	—		$	13,256	$	13,256
			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
March 29, 2014						Average
(000s)
$	10,997		Discounted cash flow	Estimated yield		1.19%
				Expected holding period		10 years
				Estimated discount rate		3.72%
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
March 29, 2014
(000s)
$	13,256		Monte Carlo simulation	Expected revenue growth rate		26.2% – 44.4%
				Expected revenue volatility		20.00%
				Expected term		0.8 – 4.8 years
				Estimated discount rate		0.1% – 1.5%
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 months ended March 29, 2014 (in thousands):
Assets
Auction Rate Securities		Three Months
		Ended
Beginning balance		$	10,632
Gain included in other comprehensive income		365
Balance at March 29, 2014		$	10,997
Liabilities
Contingent Consideration (1)		Three Months
		Ended
Beginning balance		$	12,919
Loss recognized in earnings (2)		337
Balance at March 29, 2014		$	13,256
Net loss for the period included in earnings attributable to contingent consideration held at the end of the period:		$	337
(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 increased the estimated fair value of contingent consideration because the Company now expects a higher 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 March 29, 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	3 Months Ended
	Mar. 29, 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
		March 29,		December 28,
		2014		2013
	Work in progress	$	34,709	$	34,503
	Finished goods	9,625		10,768
		$	44,334	$	45,271

Debt

Debt	3 Months Ended
	Mar. 29, 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 a per annum rate based on the base rate plus the applicable margin for base rate loans. The applicable margins for the LIBOR rate loans range from 1.50% to 2.50% and for base rate loans range from 0.50% to 1.50%, depending in each case, on the leverage ratio as defined in the Agreement. The Company also pays a commitment fee on the unused amount of the Revolving Credit Facility.
	In connection with the closing of the Credit Agreement, the Company entered into a security and pledge agreement. Under the security and pledge agreement, the Company pledged equity securities of certain of its subsidiaries, subject to exceptions and limitations. The Credit Facilities contain various conditions, covenants and representations with which the Company must be in compliance in order to borrow funds and to avoid an event of default, including financial covenants that the Company must maintain a leverage ratio (funded debt/EBITDA) of no more than 2.5 to 1 and a minimum fixed charge coverage ratio (EBITDA/debt payments, income taxes and capital expenditures) of no less than 1.50 to 1. As of March 29, 2014, the Company was in compliance with all covenants of the Credit Facilities.
	As of March 29, 2014, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):
	Fiscal Year
	2014	$	6,250
	2015	10,000
	2016	10,000
	2017	67,500
	Total	$	93,750
	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 March 29, 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	3 Months Ended
	Mar. 29, 2014
Stockholders' Equity	'
Stockholders' Equity	'
	8. Stockholders’ Equity
	Common Stock
	The Company issued 0.7 million shares of common stock during the three months ended March 29, 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 did not repurchase any shares of its common stock during the three months ended March 29, 2014 or March 30, 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	(91		)	268			177
	Amount reclassified from accumulated other comprehensive loss	93			—			93
	Net change for the period	2			268			270
	Balance at March 29, 2014	$	335		$	(749	)	$	(414	)
	Reclassifications From Accumulated Other Comprehensive Loss
		Three Months Ended
	Reclassification (in thousands)	March 29,			March 30,
		2014			2013
	Losses on cash flow hedges to:
	Interest expense	$	(143	)	$	(181	)
	Income tax benefit	50			63
	Total reclassifications	$	(93	)	$	(118	)

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 29, 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”). The 2009 Plan is currently effective, and has a term of 10 years from the shareholders’ approval date. The 2009 Purchase Plan became effective on April 30, 2010.
	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
		March 29,		March 30,
		2014		2013
	Cost of revenues	$	195	$	253
	Research and development	4,241		3,339
	Selling, general and administrative	4,841		2,668
		9,277		6,260
	Income tax benefit	1,311		748
		$	7,966	$	5,512
	The increase in stock-based compensation costs in the recent three month period was principally due to increased headcount. The Company had approximately $73.0 million of total unrecognized compensation costs related to granted stock awards as of March 29, 2014 that are expected to be recognized over a weighted-average period of 2.3 years. There were no significant stock-based compensation costs capitalized into assets in any of the periods presented.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 29, 2014
Commitments and Contingencies	'
Commitments and Contingencies	'
	10.  Commitments and Contingencies
	Litigation
	Patent Litigation
	On January 21, 2014, Cresta Technology Corporation (“Cresta Technology”), a Delaware corporation, filed a lawsuit against the Company, Samsung Electronics Co., Ltd., Samsung Electronics America, Inc., LG Electronics Inc. and LG Electronics U.S.A., Inc. in the United States District Court in the District of Delaware, alleging infringement of United States Patent Nos. 7,075,585, 7,265,792 and 7,251,466. The lawsuit relates to the Company’s family of television tuner products.  Cresta Technology seeks unspecified compensatory and enhanced damages, attorney fees and a permanent injunction. On January 28, 2014, Cresta Technology also filed a complaint with the United States International Trade Commission (“ITC”) alleging infringement of the same patents against the Company, Samsung and LG Electronics and seeking to prevent the importation and sale of allegedly infringing products in the United States. The ITC instituted an investigation based on Cresta Technology’s complaint on February 27, 2014. 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. The Company is seeking a permanent injunction stopping the sale of all allegedly infringing Cresta Technology products and an award of damages.
	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	3 Months Ended
	Mar. 29, 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 $1.5 million and $44 thousand for the three months ended March 29, 2014 and March 30, 2013, respectively, resulting in effective tax rates of 15.3% and 0.2%, respectively. The effective tax rates for the three months ended March 29, 2014 increased from the prior period, primarily due to the prior period recognition of the fiscal 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 fiscal 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 March 29, 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 in the three months ended March 29, 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)	3 Months Ended
	Mar. 29, 2014
Significant Accounting Policies	'
Revenue Recognition	'
	Revenue Recognition
	Revenues are generated almost exclusively 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.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 29, 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
		March 29,		March 30,
		2014		2013
	Net income	$	8,110	$	20,034
	Shares used in computing basic earnings per share	43,081		42,186
	Effect of dilutive securities:
	Stock options and other stock-based awards	975		924
	Shares used in computing diluted earnings per share	44,056		43,110
	Earnings per share:
	Basic	$	0.19	$	0.47
	Diluted	$	0.18	$	0.46

Cash_Cash_Equivalents_and_Inve1

Cash, Cash Equivalents and Investments (Tables)	3 Months Ended
	Mar. 29, 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):
		March 29, 2014
		Cost		Gross			Gross		Fair Value
				Unrealized			Unrealized
				Losses			Gains
	Cash and Cash Equivalents:
	Cash on hand	$	37,132	$	—		$	—	$	37,132
	Available-for-sale securities:
	Money market funds	85,070		—			—		85,070
	Certificates of deposit	6,121		—			—		6,121
	Total available-for-sale securities	91,191		—			—		91,191
	Total cash and cash equivalents	$	128,323	$	—		$	—	$	128,323
	Short-term Investments:
	Available-for-sale securities:
	Municipal bonds	$	133,965	$	(11	)	$	238	$	134,192
	Variable-rate demand notes	35,840		—			—		35,840
	Corporate bonds	23,776		(15		)	64		23,825
	Asset-backed securities	908		(1		)	1		908
	Total short-term investments	$	194,489	$	(27	)	$	303	$	194,765
	Long-term Investments:
	Available-for-sale securities:
	Auction rate securities	$	12,425	$	(1,428	)	$	—	$	10,997
	Total long-term investments	$	12,425	$	(1,428	)	$	—	$	10,997
		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 March 29, 2014	Fair		Gross			Fair		Gross			Fair		Gross
		Value		Unrealized			Value		Unrealized			Value		Unrealized
				Losses					Losses					Losses
	Auction rate securities	$	—	$	—		$	10,997	$	(1,428	)	$	10,997	$	(1,428	)
	Municipal bonds	10,662		(11		)	—		—			10,662		(11		)
	Corporate bonds	7,426		(15		)	—		—			7,426		(15		)
	Asset-backed securities	501		(1		)	—		—			501		(1		)
		$	18,589	$	(27	)	$	10,997	$	(1,428	)	$	29,586	$	(1,455	)
		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 March 29, 2014 (in thousands):
		Cost		Fair
				Value
	Due in one year or less	$	168,349	$	168,456
	Due after one year through ten years	84,666		84,836
	Due after ten years	45,090		43,661
		$	298,105	$	296,953

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 29, 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

March 29,

December 28,

2014

2013

Interest rate swap

Other assets, net

$

514

$

513

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

'

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

Gain (Loss) Recognized in OCI

Location of Loss

Loss Reclassified

on Derivatives

Reclassified into

from Accumulated

(Effective Portion)

Income

OCI into Income

during the:

(Effective Portion)

during the:

Three Months Ended

Three Months Ended

March 29,

March 30,

March 29,

March 30,

2014

2013

2014

2013

Interest rate swaps

$

(141

)

$

44

Interest expense

$

(143

)

$

(181

)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 29, 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 March 29, 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		$	85,070	$	—		$	—	$	85,070
	Certificates of deposit		—		6,121			—		6,121
	Total cash equivalents		$	85,070	$	6,121		$	—	$	91,191
	Short-term Investments:
	Municipal bonds		$	—	$	134,192		$	—	$	134,192
	Variable-rate demand notes		—		35,840			—		35,840
	Corporate bonds		—		23,825			—		23,825
	Asset-backed securities		—		908			—		908
	Total short-term investments		$	—	$	194,765		$	—	$	194,765
	Long-term Investments:
	Auction rate securities		$	—	$	—		$	10,997	$	10,997
	Total long-term investments		$	—	$	—		$	10,997	$	10,997
	Other assets, net:
	Derivative instruments		$	—	$	514		$	—	$	514
	Total		$	—	$	514		$	—	$	514
	Total		$	85,070	$	201,400		$	10,997	$	297,467
	Liabilities:
	Accrued expenses:
	Contingent consideration		$	—	$	—		$	3,754	$	3,754
	Other non-current liabilities:
	Contingent consideration		$	—	$	—		$	9,502	$	9,502
	Total		$	—	$	—		$	13,256	$	13,256
			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
	March 29, 2014						Average
	(000s)
	$	10,997		Discounted cash flow	Estimated yield		1.19%
					Expected holding period		10 years
					Estimated discount rate		3.72%
Summary of quantitative information about level 3 liability fair value measurements	'
	Contingent consideration
	Fair Value at			Valuation Technique	Unobservable Input		Range
	March 29, 2014
	(000s)
	$	13,256		Monte Carlo simulation	Expected revenue growth rate		26.2% – 44.4%
					Expected revenue volatility		20.00%
					Expected term		0.8 – 4.8 years
					Estimated discount rate		0.1% – 1.5%
Summary of activity in Level 3 financial instruments	'
	The following summarizes the activity in Level 3 financial instruments for the three months ended March 29, 2014 (in thousands):
	Assets
	Auction Rate Securities		Three Months
			Ended
	Beginning balance		$	10,632
	Gain included in other comprehensive income		365
	Balance at March 29, 2014		$	10,997
	Liabilities
	Contingent Consideration (1)		Three Months
			Ended
	Beginning balance		$	12,919
	Loss recognized in earnings (2)		337
	Balance at March 29, 2014		$	13,256
	Net loss for the period included in earnings attributable to contingent consideration held at the end of the period:		$	337
	(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 increased the estimated fair value of contingent consideration because the Company now expects a higher level of earn-out achievement.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	3 Months Ended
	Mar. 29, 2014
Balance Sheet Details	'
Inventories	'
	The following shows the details of selected Condensed Consolidated Balance Sheet items (in thousands):
	Inventories
		March 29,		December 28,
		2014		2013
	Work in progress	$	34,709	$	34,503
	Finished goods	9,625		10,768
		$	44,334	$	45,271

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 29, 2014
Debt	'
Schedule of remaining contractual maturities of the Term Loan Facility	'
	As of March 29, 2014, the remaining contractual maturities of the Term Loan Facility were as follows (in thousands):
	Fiscal Year
	2014	$	6,250
	2015	10,000
	2016	10,000
	2017	67,500
	Total	$	93,750

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 29, 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	(91		)	268			177
	Amount reclassified from accumulated other comprehensive loss	93			—			93
	Net change for the period	2			268			270
	Balance at March 29, 2014	$	335		$	(749	)	$	(414	)
Schedule of Reclassifications From Accumulated Other Comprehensive Loss	'
		Three Months Ended
	Reclassification (in thousands)	March 29,			March 30,
		2014			2013
	Losses on cash flow hedges to:
	Interest expense	$	(143	)	$	(181	)
	Income tax benefit	50			63
	Total reclassifications	$	(93	)	$	(118	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 29, 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
		March 29,		March 30,
		2014		2013
	Cost of revenues	$	195	$	253
	Research and development	4,241		3,339
	Selling, general and administrative	4,841		2,668
		9,277		6,260
	Income tax benefit	1,311		748
		$	7,966	$	5,512

Significant_Accounting_Policie2

Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Mar. 29, 2014	Dec. 27, 2014	Dec. 28, 2013
Basis of Presentation and Principles of Consolidation	'	'	'
Length of fiscal year	'91 days	'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
In Thousands, except Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Earnings Per Share	'	'
Net income	$8,110	$20,034
Shares used in computing basic earnings per share	43,081,000	42,186,000
Effect of dilutive securities:	'	'
Stock options and other stock-based awards (in shares)	975,000	924,000
Shares used in computing diluted earnings per share	44,056,000	43,110,000
Earnings per share:	'	'
Basic (in dollars per share)	$0.19	$0.47
Diluted (in dollars per share)	$0.18	$0.46
Shares excluded from computation of diluted earning per share	200,000	600,000

Cash_Cash_Equivalents_and_Inve2

Cash, Cash Equivalents and Investments (Details) (USD $)	3 Months Ended
	Mar. 29, 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	37,132,000	45,544,000
Cash on hand, Fair Value	37,132,000	45,544,000
Cash and cash equivalents, Cost	128,323,000	95,800,000
Cash and cash equivalents, Fair Value	128,323,000	95,800,000
Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	91,191,000	50,256,000
Available-for-sale securities, Fair Value	91,191,000	50,256,000
Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	194,489,000	179,365,000
Available-for-sale securities, Gross Unrealized Losses	-27,000	-15,000
Available-for-sale securities, Gross Unrealized Gains	303,000	243,000
Available-for-sale securities, Fair Value	194,765,000	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	-1,428,000	-1,793,000
Available-for-sale securities, Fair Value	10,997,000	10,632,000
Money market funds | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	85,070,000	39,538,000
Available-for-sale securities, Fair Value	85,070,000	39,538,000
Certificates of deposit | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	6,121,000	7,768,000
Available-for-sale securities, Fair Value	6,121,000	7,768,000
Commercial paper | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	2,499,000
Available-for-sale securities, Fair Value	'	2,499,000
Commercial paper | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	3,748,000
Available-for-sale securities, Fair Value	'	3,748,000
Municipal bonds | Cash Equivalents:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	'	451,000
Available-for-sale securities, Fair Value	'	451,000
Municipal bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	133,965,000	119,289,000
Available-for-sale securities, Gross Unrealized Losses	-11,000	-11,000
Available-for-sale securities, Gross Unrealized Gains	238,000	182,000
Available-for-sale securities, Fair Value	134,192,000	119,460,000
Corporate bonds | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	23,776,000	17,788,000
Available-for-sale securities, Gross Unrealized Losses	-15,000	-4,000
Available-for-sale securities, Gross Unrealized Gains	64,000	60,000
Available-for-sale securities, Fair Value	23,825,000	17,844,000
Variable-rate demand notes | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	35,840,000	38,025,000
Available-for-sale securities, Fair Value	35,840,000	38,025,000
Asset-backed securities | Short-term Investments:	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Cost	908,000	515,000
Available-for-sale securities, Gross Unrealized Losses	-1,000	'
Available-for-sale securities, Gross Unrealized Gains	1,000	1,000
Available-for-sale securities, Fair Value	908,000	516,000
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	-1,428,000	-1,793,000
Available-for-sale securities, Fair Value	$10,997,000	$10,632,000

Cash_Cash_Equivalents_and_Inve3

Cash, Cash Equivalents and Investments (Details 2) (USD $)	Mar. 29, 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	$18,589	$13,684
Fair value of available-for-sale securities, continuous loss position for twelve months or longer	10,997	10,632
Total fair value of available-for-sale securities, continuous loss position	29,586	24,316
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-27	-15
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,428	-1,793
Available-for-sale securities, total gross unrealized losses	-1,455	-1,808
Cost	'	'
Due in one year or less, Cost	168,349	'
Due after one year through ten years, Cost	84,666	'
Due after ten years, Cost	45,090	'
Total Cost	298,105	'
Fair Value	'	'
Due in one year or less, Fair Value	168,456	'
Due after one year through ten years, Fair Value	84,836	'
Due after ten years, Fair Value	43,661	'
Total Fair Value	296,953	'
Municipal bonds	'	'
Continuous unrealized loss position, Fair Value	'	'
Fair value of available-for-sale securities, continuous loss position for less than twelve months	10,662	11,079
Total fair value of available-for-sale securities, continuous loss position	10,662	11,079
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses	-11	-11
Available-for-sale securities, total gross unrealized losses	-11	-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	10,997	10,632
Total fair value of available-for-sale securities, continuous loss position	10,997	10,632
Continuous unrealized loss position, Gross Unrealized Losses	'	'
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses	-1,428	-1,793
Available-for-sale securities, total gross unrealized losses	-1,428	-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	7,426	2,605
Total fair value of available-for-sale securities, continuous loss position	7,426	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	501	'
Total fair value of available-for-sale securities, continuous loss position	501	'
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 $)	Mar. 29, 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 $)	3 Months Ended
	Mar. 29, 2014	Mar. 29, 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	'	$514,000	$513,000

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 3) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 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	'
Cash flow hedges | Interest rate swaps	'	'
Derivative Instruments, Gain (Loss)	'	'
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period	-141,000	44,000
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)	($181,000)

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	$128,323	$95,800
Total short-term investments	194,765	179,593
Total long-term investments	10,997	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	85,070	39,538
Total assets at fair value	85,070	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	85,070	39,538
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	6,121	10,718
Total short-term investments	194,765	179,593
Derivative instruments	514	513
Other assets, net	514	513
Total assets at fair value	201,400	190,824
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposit	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	6,121	7,768
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	2,499
Total short-term investments	'	3,748
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	451
Total short-term investments	134,192	119,460
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	35,840	38,025
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	23,825	17,844
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	908	516
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	10,997	10,632
Total assets at fair value	10,997	10,632
Total liabilities at fair value	13,256	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	3,754	'
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	9,502	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	10,997	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	91,191	50,256
Total short-term investments	194,765	179,593
Total long-term investments	10,997	10,632
Derivative instruments	514	513
Other assets, net	514	513
Total assets at fair value	297,467	240,994
Total liabilities at fair value	13,256	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	3,754	'
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	9,502	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	85,070	39,538
Assets and liabilities measured at fair value on recurring basis | Fair Value | Certificates of deposit	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	6,121	7,768
Assets and liabilities measured at fair value on recurring basis | Fair Value | Commercial paper	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	2,499
Total short-term investments	'	3,748
Assets and liabilities measured at fair value on recurring basis | Fair Value | Municipal bonds	'	'
Financial assets and liabilities measured at fair value on a recurring basis	'	'
Total cash equivalents	'	451
Total short-term investments	134,192	119,460
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	35,840	38,025
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	23,825	17,844
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	908	516
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	$10,997	$10,632

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Details 2) (Auction rate securities, Weighted Average, Discounted cash flow)	3 Months Ended
	Mar. 29, 2014
Auction rate securities | Weighted Average | Discounted cash flow	'
Quantitative information for Level 3 Fair Value Measurements Assets	'
Estimated yield (as a percent)	1.19%
Expected holding period	'10 years
Estimated discount rate (as a percent)	3.72%

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Details 3) (Contingent consideration, Monte Carlo simulation)	3 Months Ended
	Mar. 29, 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)	26.20%
Expected term	'9 months 18 days
Estimated discount rate (as a percent)	0.10%
High end of range	'
Quantitative information for Level 3 fair value measurements liabilities	'
Expected revenue growth rate (as a percent)	44.40%
Expected term	'4 years 9 months 18 days
Estimated discount rate (as a percent)	1.50%

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
In Thousands, unless otherwise specified	Mar. 29, 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	$10,632
Gain included in other comprehensive income	365
Balance at the end of the period	$10,997

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
In Thousands, unless otherwise specified	Mar. 29, 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	$12,919
Loss recognized in earnings	337
Balance at the end of the period	13,256
Net loss for the period included in earnings attributable to contingent consideration held at the end of the period:	$337

Balance_Sheet_Details_Details

Balance Sheet Details (Details) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Inventories	'	'
Work in progress	$34,709	$34,503
Finished goods	9,625	10,768
Total inventories	$44,334	$45,271

Debt_Details

Debt (Details) (USD $)

1 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

Jul. 31, 2012

Mar. 29, 2014

Sep. 27, 2012

Jul. 31, 2012

Mar. 29, 2014

Jul. 31, 2012

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 2014

Mar. 29, 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

'

6,250,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

'

67,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Total debt

'

$93,750,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended				1 Months Ended
In Thousands, except Share data in Millions, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 29, 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	0.7	'	'	'	'	'	'
Stockholders' Equity	'	'	'	'	'	'	'
Program Amount authorized to repurchase	'	'	'	'	$100,000	$50,000	$100,000
Components of accumulated other comprehensive loss, net of taxes	'	'	'	'	'	'	'
Balance at beginning of the period	-684	'	333	-1,017	'	'	'
Other comprehensive income (loss) before reclassifications	177	'	-91	268	'	'	'
Amounts reclassified from accumulated other comprehensive loss	93	'	93	'	'	'	'
Other comprehensive income	270	71	2	268	'	'	'
Balance at end of the period	($414)	'	$335	($749)	'	'	'

Stockholders_Equity_Details_2

Stockholders' Equity (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Amounts Reclassified from AOCI	'	'
Interest expense	($798)	($842)
Income tax benefit	-1,470	-44
Net income	8,110	20,034
Losses on cash flow hedge | Reclassifications From Accumulated Other Comprehensive Loss	'	'
Amounts Reclassified from AOCI	'	'
Interest expense	-143	-181
Income tax benefit	50	63
Net income	($93)	($118)

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 31, 2009	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
			2009 Stock Incentive Plan	Cost of revenues	Cost of revenues	Research and development	Research and development	Selling, general and administrative	Selling, general and administrative
Stock-based compensation costs	'	'	'	'	'	'	'	'	'
Term of plan	'	'	'10 years	'	'	'	'	'	'
Share based compensation cost before tax	$9,277,000	$6,260,000	'	$195,000	$253,000	$4,241,000	$3,339,000	$4,841,000	$2,668,000
Income tax benefit	1,311,000	748,000	'	'	'	'	'	'	'
Share based compensation cost after tax	7,966,000	5,512,000	'	'	'	'	'	'	'
Total unrecognized compensation costs related to awards	$73,000,000	'	'	'	'	'	'	'	'
Weighted-average period of recognition of unrecognized compensation costs	'2 years 3 months 18 days	'	'	'	'	'	'	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Income Taxes	'	'
Income tax expense	$1,470,000	$44,000
Effective income tax rate (as a percent)	15.30%	0.20%
Gross unrecognized tax benefits	3,500,000	'
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	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	'