Cognex (CGNX) 10-Q30 Apr 142014 Q1 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 30, 2014
Document And Entity Information [Abstract]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Mar-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q1
Entity Registrant Name	'COGNEX CORP
Entity Central Index Key	'0000851205
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
Entity Common Stock, Shares Outstanding	86,840,001

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Revenue	'	'
Product	$83,569	$74,672
Service	7,360	6,220
Total revenue	90,929	80,892
Cost of revenue	'	'
Product	17,286	16,464
Service	3,798	2,959
Total cost of revenue	21,084	19,423
Gross margin	'	'
Product	66,283	58,208
Service	3,562	3,261
Total gross margin	69,845	61,469
Research, development, and engineering expenses	12,502	11,321
Selling, general, and administrative expenses	34,900	32,167
Operating income	22,443	17,981
Foreign currency loss	-110	63
Investment income	787	392
Other income (expense)	-273	117
Income before income tax expense	22,847	18,553
Income tax expense	4,341	2,970
Net income	$18,506	$15,583
Earnings per weighted-average common and common-equivalent share:	'	'
Basic, in dollars per share	$0.21	$0.18	[1]
Diluted, in dollars per share	$0.21	$0.18	[1]
Weighted-average common and common-equivalent shares outstanding:	'	'
Basic, in shares	86,879	86,522	[1]
Diluted, in shares	89,259	88,260	[1]

[1]	Prior period results have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (Parenthetical)	1 Months Ended	3 Months Ended
Consolidated Statements of Operations (Parenthetical)	Jul. 29, 2013	Sep. 29, 2013
Income Statement [Abstract]	'	'
Stock split conversion ratio	2	2

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net income	$18,506	$15,583
Cash flows hedges [Abstract]	'	'
Change in net unrealized gain (loss), net of tax of ($16) and $0 in 2014 and 2013, respectively	-166	0
Reclassification adjustments for loss (gain) included in net income	33	0
Net change related to cash flow hedges	-199	0
Available-for-sale investments	'	'
Change in net unrealized gain (loss), net of tax of $113 and $42 in 2014 and 2013, respectively	518	142
Reclassification of net realized gain on the sale of available-for-sale investments	-501	-31
Net change related to available-for-sale investments	1,019	173
Currency translation adjustments [Abstract]	'	'
Change in currency translation adjustments, net of tax of $7 and ($227) in 2014 and 2013, respectively	445	-2,494
Other comprehensive income (loss), net of tax	1,265	-2,321
Total comprehensive income	$19,771	$13,262

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Tax effect on cash flow hedges	($16)	$0
Tax effect of unrealized gain (loss) on available-for-sale investments	113	42
Tax effect of foreign currency translation adjustment	$7	($227)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Current assets:	'	'
Cash and cash equivalents	$42,463	$40,644
Short-term investments	41,777	184,822
Accounts receivable, less reserves of $1,328 and $1,354 in 2014 and 2013, respectively	51,947	53,015
Inventories	28,434	25,694
Deferred income taxes	7,463	7,611
Prepaid expenses and other current assets	17,797	20,265
Total current assets	189,881	332,051
Long-term investments	379,916	229,655
Property, plant, and equipment, net	37,826	37,136
Deferred income taxes	12,288	12,307
Intangible assets, net	13,807	14,723
Goodwill	81,689	81,689
Other assets	2,110	2,138
Total assets	717,517	709,699
Current liabilities:	'	'
Accounts payable	9,671	9,487
Accrued expenses	26,140	34,331
Accrued income taxes	276	1,263
Deferred revenue and customer deposits	16,443	15,941
Total current liabilities	52,530	61,022
Reserve for income taxes	3,939	4,765
Commitments and contingencies (Note 7)	'	'
Shareholders' equity:	'	'
Common stock, $.002 par value â€“ Authorized: 140,000 shares, issued and outstanding: 86,840 and 86,831 shares in 2014 and 2013, respectively	174	174
Additional paid-in capital	223,560	211,440
Retained earnings	466,350	462,131
Accumulated other comprehensive loss, net of tax	-29,036	-29,833
Total shareholdersâ€™ equity	661,048	643,912
Total liabilities and shareholders' equity	$717,517	$709,699

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Reserves for accounts receivable	$1,328	$1,354
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	140,000	140,000
Common stock, shares issued	86,840	86,831

Consolidated_Condensed_Stateme

Consolidated Condensed Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income	$18,506	$15,583
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Stock-based compensation expense	4,004	3,298
Depreciation of property, plant, and equipment	1,990	1,828
Amortization of intangible assets	916	961
Amortization of discounts or premiums on investments	896	758
Realized gain on sale of investments	-501	-31
Tax effect of stock option exercises	-2,165	-1,376
Change in deferred income taxes	127	-1,371
Change in operating assets and liabilities	-6,312	-860
Net cash provided by operating activities	17,461	18,790
Cash flows from investing activities:	'	'
Purchases of investments	-124,734	-76,694
Maturities and sales of investments	117,753	48,248
Purchases of property, plant, and equipment	-2,685	-1,908
Net cash used in investing activities	-9,666	-30,354
Cash flows from financing activities:	'	'
Issuance of common stock under stock option plans	5,951	9,168
Repurchase of common stock	-14,287	0
Tax effect of stock option exercises	2,165	1,376
Net cash provided by (used in) financing activities	-6,171	10,544
Effect of foreign exchange rate changes on cash and cash equivalents	195	-1,383
Net change in cash and cash equivalents	1,819	-2,403
Cash and cash equivalents at beginning of period	40,644	45,160
Cash and cash equivalents at end of period	$42,463	$42,757

Consolidated_Statement_of_Shar

Consolidated Statement of Shareholders' Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013	$643,912	$174	$211,440	$462,131	($29,833)
Beginning Balance, Shares at Dec. 31, 2013	86,831	86,831	'	'	'
Issuance of common stock under stock option plans	5,951	0	5,951	'	'
Issuance of common stock under stock option plans, shares	396	389	'	'	'
Repurchase of common stock	-14,287	0	'	-14,287	'
Repurchase of common stock, shares	'	-380	'	'	'
Stock-based compensation expense	4,004	'	4,004	'	'
Excess tax benefit from stock option exercises	2,165	'	2,165	'	'
Net income	18,506	'	'	18,506	'
Net unrealized loss on cash flow hedges, net of tax of $16	-199	'	'	'	-199
Reclassification adjustments for loss (gain) included in net income	33	'	'	'	33
Net unrealized gain on available-for-sale investments, net of tax of $113	1,019	'	'	'	1,019
Reclassification of net realized gain on the sale of available-for-sale investments	-501	'	'	'	-501
Foreign currency translation adjustment, net of tax of $7	445	'	'	'	445
Ending Balance at Mar. 30, 2014	$661,048	$174	$223,560	$466,350	($29,036)
Ending Balance, Shares at Mar. 30, 2014	86,840	86,840	'	'	'

Consolidated_Statement_of_Shar1

Consolidated Statement of Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014
Statement of Stockholders' Equity [Abstract]	'
Tax effect on cash flow hedges	($16)
Tax effect of unrealized gain (loss) on available-for-sale investments	113
Foreign currency translation adjustment, tax	$7

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	As permitted by the rules of the Securities and Exchange Commission applicable to Quarterly Reports on Form 10-Q, these notes are condensed and do not contain all disclosures required by generally accepted accounting principles (GAAP). Reference should be made to the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	In the opinion of the management of Cognex Corporation (the “Company”), the accompanying consolidated unaudited financial statements contain all adjustments, consisting of normal, recurring adjustments and financial statement reclassifications necessary to present fairly the Company’s financial position as of March 30, 2014, and the results of its operations for the three-month periods ended March 30, 2014 and March 31, 2013, and changes in shareholders’ equity, comprehensive income, and cash flows for the periods presented.
	The results disclosed in the Consolidated Statements of Operations for the three-month period ended March 30, 2014 are not necessarily indicative of the results to be expected for the full year.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis
	The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of March 30, 2014 (in thousands):


		Quoted Prices in		Significant Other
		Active Markets		Observable
		for Identical		Inputs (Level 2)
		Assets (Level 1)
	Assets:
	Money market instruments	$	5,723	$	—

	Corporate bonds	—		224,352

	Treasury bills	—		86,804

	Asset-backed securities	—		74,885

	Sovereign bonds	—		20,417

	Municipal bonds	—		11,779

	Agency bonds	—		1,500

	Cash flow hedge forward contracts	—		33

	Liabilities:
	Cash flow hedge forward contracts	—		112

	The Company’s money market instruments are reported at fair value based upon the daily market price for identical assets in active markets, and are therefore classified as Level 1.
	The Company’s debt securities and forward contracts are reported at fair value based upon model-driven valuations in which all significant inputs are observable or can be derived from or corroborated by observable market data for substantially the full term of the asset or liability, and are therefore classified as Level 2. Management is responsible for estimating the fair value of these financial assets and liabilities, and in doing so, considers valuations provided by a large, third-party pricing service. For debt securities, this service maintains regular contact with market makers, brokers, dealers, and analysts to gather information on market movement, direction, trends, and other specific data. They use this information to structure yield curves for various types of debt securities and arrive at the daily valuations. The Company's forward contracts are typically traded or executed in over-the-counter markets with a high degree of pricing transparency. The market participants are generally large commercial banks.
	The Company did not record an other-than-temporary impairment of these financial assets or liabilities during the three-month period ended March 30, 2014.
	Financial Assets that are Measured at Fair Value on a Non-recurring Basis
	The Company has an interest in a limited partnership, which is accounted for using the cost method and is required to be measured at fair value on a non-recurring basis. Management is responsible for estimating the fair value of this investment, and in doing so, considers valuations of the partnership’s investments as determined by the General Partner. Publicly-traded investments in active markets are reported at the market closing price less a discount, as appropriate, to reflect restricted marketability. Fair value for private investments for which observable market prices in active markets do not exist is based upon the best information available including the value of a recent financing, reference to observable valuation measures for comparable companies (such as revenue multiples), public or private transactions (such as the sale of a comparable company), and valuations for publicly-traded comparable companies. The valuations also incorporate the General Partner’s own judgment and close familiarity with the business activities of each portfolio company. Significant increases or decreases in any of these inputs in isolation may result in a significantly lower or higher fair value measurement. The portfolio consists of securities of public and private companies, and consequently, inputs used in the fair value calculation are classified as Level 3. The Company did not record an other-than-temporary impairment of this asset during the three-month period ended March 30, 2014.
	Non-financial Assets that are Measured at Fair Value on a Non-recurring Basis
	Non-financial assets such as goodwill, intangible assets, and property, plant, and equipment are required to be measured at fair value only when an impairment loss is recognized. The Company did not record an impairment charge related to these assets during the three-month period ended March 30, 2014.

Cash_Cash_Equivalents_and_Inve

Cash, Cash Equivalents, and Investments	3 Months Ended
	Mar. 30, 2014
Cash and Cash Equivalents [Abstract]	'
Cash, Cash Equivalents, and Investments	'
	Cash, cash equivalents, and investments consisted of the following (in thousands):


		30-Mar-14			31-Dec-13
	Cash	$	36,740		$	40,124

	Money market instruments	5,723			520

	Cash and cash equivalents	42,463			40,644

	Corporate bonds	33,585			109,040

	Municipal bonds	4,766			9,276

	Sovereign bonds	3,016			11,448

	Asset-backed securities	410			53,559

	Agency bonds	—			1,499

	Short-term investments	41,777			184,822

	Corporate bonds	190,767			109,909

	Treasury bills	86,804			73,666

	Asset-backed securities	74,475			21,820

	Sovereign bonds	17,401			16,385

	Municipal bonds	7,013			5,919

	Agency bonds	1,500			—

	Limited partnership interest	1,956			1,956

	Long-term investments	379,916			229,655

		$	464,156		$	455,121

	The Company’s investment portfolio includes corporate bonds, municipal bonds, sovereign bonds, asset-backed securities, treasury bills, and agency bonds. Corporate bonds consist of debt securities issued by both domestic and foreign companies; municipal bonds consist of debt securities issued by state and local government entities; sovereign bonds consist of direct debt issued by foreign governments; asset-backed securities consist of debt securities collateralized by pools of receivables or loans with credit enhancement; treasury bills consist of debt securities issued by both the U.S. and foreign governments; and agency bonds consist of domestic or foreign obligations of government agencies and government sponsored enterprises that have government backing.
	The following table summarizes the Company’s available-for-sale investments as of March 30, 2014 (in thousands):


		Amortized			Gross			Gross				Fair Value
		Cost			Unrealized			Unrealized
					Gains			Losses
	Short-term:
	Corporate bonds	$	33,480		$	105		$	—			$	33,585

	Municipal bonds	4,758			8			—				4,766

	Sovereign bonds	2,996			20			—				3,016

	Asset-backed securities	410			—			—				410

	Long-term:
	Corporate bonds	190,185			680			(98		)		190,767

	Treasury bills	86,941			2			(139		)		86,804

	Asset-backed securities	74,471			69			(65		)		74,475

Sovereign bonds	17,367			52			(18		)		17,401

Municipal bonds	6,968			45			—				7,013

Agency bonds	1,500			—			—				1,500

	$	419,076		$	981		$	(320	)		$	419,737

The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of March 30, 2014 (in thousands):


	Unrealized Loss Position For:
	Less than 12 Months						12 Months or Greater							Total
	Fair Value			Unrealized			Fair Value				Unrealized			Fair Value		Unrealized
				Losses							Losses					Losses
Corporate bonds	$	55,024		$	(98	)	$	—			$	—		$	55,024	$	(98	)

Asset-backed securities	23,535			(38		)	8,456				(27		)	31,991		(65		)

Sovereign bonds	3,347			(18		)	—				—			3,347		(18		)

Treasury bills	82,753			(139		)	—				—			82,753		(139		)

	$	164,659		$	(293	)	$	8,456			$	(27	)	$	173,115	$	(320	)

As of March 30, 2014, the Company did not recognize an other-than-temporary impairment of these investments. In its evaluation, management considered the type of security, the credit rating of the security, the length of time the security has been in a loss position, the size of the loss position, our intent and ability to hold the security to expected recovery of value, and other meaningful information. The Company does not intend to sell, and is unlikely to be required to sell, any of these available-for-sale investments before its effective maturity or market price recovery.
The Company recorded gross realized gains and gross realized losses on the sale of investments totaling $512,000 and $11,000, respectively, during the three-month period ended March 30, 2014 and $50,000 and $19,000, respectively, during the three-month period ended March 31, 2013. These gains and losses are included in "Investment income" on the Consolidated Statements of Operations.
The following table presents the effective maturity dates of the Company’s available-for-sale investments as of March 30, 2014 (in thousands):


	1			2-Jan			3-Feb				4-Mar			5-Apr		5-8 Years			Total
	Year or Less			Years			Years				Years			Years
Corporate bonds	$	33,585		$	64,435		$	94,424			$	2,428		$	29,480	$	—		$	224,352

Treasury bills	—			32,317			54,487				—			—		—			86,804

Asset-backed securities	410			5,287			14,663				29,396			21,243		3,886			74,885

Sovereign bonds	3,016			12,502			4,899				—			—		—			20,417

Municipal bonds	4,766			3,981			1,475				1,557			—		—			11,779

Agency bonds	—			—			1,500				—			—		—			1,500

	$	41,777		$	118,522		$	171,448			$	33,381		$	50,723	$	3,886		$	419,737

The Company is a Limited Partner in Venrock Associates III, L.P. (Venrock), a venture capital fund. The Company has committed to a total investment in the limited partnership of up to $20,500,000, with an expiration date of December 31, 2015. As of March 30, 2014, the Company contributed $19,886,000 to the partnership. The remaining commitment of $614,000 can be called by Venrock at any time before December 31, 2015. Distributions and contributions are at the discretion of Venrock’s management. No contributions were made and no distributions were received during the three-month period ended March 30, 2014.

Inventories

Inventories	3 Months Ended
	Mar. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories consisted of the following (in thousands):


		30-Mar-14		31-Dec-13
	Raw materials	$	12,958	$	13,101

	Work-in-process	7,521		4,472

	Finished goods	7,955		8,121

		$	28,434	$	25,694

Intangible_Assets_and_Goodwill

Intangible Assets and Goodwill	3 Months Ended
Intangible Assets and Goodwill	Mar. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets and Goodwill	'
Intangible Assets and Goodwill	The Company evaluates the possible impairment of goodwill and other intangible assets whenever events or circumstances indicate that the carrying value of these assets may not be recoverable. No triggering event occurred in the three-month period ended March 30, 2014 that would indicate a potential impairment of goodwill or other intangible assets.

Warranty_Obligations

Warranty Obligations	3 Months Ended
	Mar. 30, 2014
Guarantees [Abstract]	'
Warranty Obligations	'
	The Company records the estimated cost of fulfilling product warranties at the time of sale based upon historical costs to fulfill claims. Obligations may also be recorded subsequent to the time of sale whenever specific events or circumstances impacting product quality become known that would not have been taken into account using historical data. While we engage in extensive product quality programs and processes, including actively monitoring and evaluating the quality of our component suppliers and third-party contract manufacturers, the Company’s warranty obligation is affected by product failure rates, material usage, and service delivery costs incurred in correcting a product failure. An adverse change in any of these factors may result in the need for additional warranty provisions. Warranty obligations are included in “Accrued expenses” on the Consolidated Balance Sheets.
	The changes in the warranty obligations were as follows (in thousands):


	Balance as of December 31, 2013	$	3,016

	Provisions for warranties issued during the period	759

	Fulfillment of warranty obligations	(524		)
	Foreign exchange rate changes	8

	Balance as of March 30, 2014	$	3,259

Contingencies

Contingencies	3 Months Ended
Contingencies	Mar. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contingencies	'
	In May 2008, the Company filed a complaint against MvTec Software GmbH, MvTec LLC, and Fuji America Corporation in the United States District Court for the District of Massachusetts alleging infringement of certain patents owned by the Company. This matter is ongoing.
	In May 2009, the Company pre-filed a complaint with the United States International Trade Commission (ITC) pursuant to Section 337 of the Tariff Act of 1930, as amended, 19 U.S.C. §1337, against MvTec Software GmbH, MvTec LLC, Fuji America, and several other respondents alleging unfair methods of competition and unfair acts in the unlawful importation into the United States, sale for importation, or sale within the United States after importation. By this filing, the Company requested the ITC to investigate the Company’s contention that certain machine vision software, machine vision systems, and products containing the same infringe, and respondents directly infringe and/or actively induce and/or contribute to the infringement in the United States, of one or more of the Company’s U.S. patents. In July 2009, the ITC issued an order that it would institute an investigation based upon the Company’s assertions. In September 2009, the Company reached a settlement with two of the respondents, and in December 2009, the Company reached a settlement with five additional respondents. In March 2010, the Company reached a settlement with respondent Fuji Machine Manufacturing Co., Ltd. and its subsidiary Fuji America Corporation. These settlements did not have a material impact on the Company’s financial results. An ITC hearing was held in May 2010. In July 2010, the Administrative Law Judge issued an initial determination finding two of the Company’s patents invalid and that respondents did not infringe the patents-at-issue. In September 2010, the ITC issued a notice that it would review the initial determination of the Administrative Law Judge. The ITC issued its Final Determination in November 2010 in which it determined to modify-in-part and affirm-in-part the Administrative Law Judge’s determination, and terminate the investigation with a finding of no violation of Section 337 of the Tariff Act of 1930 (as amended 19 U.S.C. §1337). The Company has filed an appeal of the decision with the United States Court of Appeals for the Federal Circuit. An oral hearing before the United States Court of Appeals occurred in February 2012. In December 2013, the Federal Circuit affirmed the ITC’s finding of non-infringement, but did not address the ITC’s finding regarding validity.
	In March 2013, the Company filed a lawsuit against Microscan Systems, Inc. (“Microscan”) and Code Corporation in the United States District Court for the Southern District of New York alleging that Microscan’s Mobile Hawk handheld imager infringes U.S. Patent 7,874,487 owned by the Company. The lawsuit seeks to prohibit Code Corporation from manufacturing the product, and Microscan from selling and distributing the product. The Company is also seeking monetary damages resulting from the alleged infringement. Both parties have filed motions for summary judgment and a hearing on these motions was held in October 2013. Trial was originally scheduled for October 2013, but has been moved to April 2014. This matter is ongoing.
	The Company cannot predict the outcome of the above-referenced pending matters and an adverse resolution of these lawsuits could have a material adverse effect on the Company’s financial position, liquidity, results of operations, and/or indemnification obligations. In addition, various other claims and legal proceedings generally incidental to the normal course of business are pending or threatened on behalf of or against the Company. While we cannot predict the outcome of these incidental matters, we believe that any liability arising from them will not have a material adverse effect on our financial position, liquidity, or results of operations.

Guarantees

Guarantees	3 Months Ended
	Mar. 30, 2014
Guarantees [Abstract]	'
Guarantees	'
	In the ordinary course of business, the Company enters into guarantee contracts with certain customers, generally in the Company’s Surface Inspection Systems Division (SISD) business. These guarantees represent standby letters of credit (LOC) which can be grouped into three categories: (1) bank guarantees which may require the Company to return a customer’s initial payment if the Company cannot deliver the order; (2) warranty bonds which may require the Company to resolve warranty issues within a specified time period; and (3) performance bonds which include a combination of the above two options. The type of LOC is generally determined based upon customer request and the guarantee amount represents the maximum potential amount of future payments. All of the Company’s LOCs are with the same counterparty and they do not contain any recourse provisions or collateral obligations.
	The following table details the letters of credit outstanding as of March 30, 2014:


	Type	Guarantee		Guarantee Due Date
		Amount
		(in thousands)
	Warranty bonds	$	976	Various from April 2014 to June 2016

	Performance bonds	398		Various from June 2014 to July 2016

	Bank guarantees	373		Various from April 2014 to July 2014

		$	1,747

	The Company evaluates losses for guarantees under accounting for contingencies. The Company considers such factors as the degree of probability that the Company would be required to satisfy the guarantee and the ability to make a reasonable estimate of the loss. To date, the Company has not incurred any losses as a result of these obligations, and therefore, has not recorded any liability related to such obligation in its financial statements. The fair value of the Company’s outstanding guarantees is immaterial for all periods presented.

Indemnification_Provisions

Indemnification Provisions	3 Months Ended
Indemnification Provisions	Mar. 30, 2014
Guarantees [Abstract]	'
Indemnification Provisions	'
	Except as limited by Massachusetts law, the by-laws of the Company require it to indemnify certain current or former directors, officers, and employees of the Company against expenses incurred by them in connection with each proceeding in which he or she is involved as a result of serving or having served in certain capacities. Indemnification is not available with respect to a proceeding as to which it has been adjudicated that the person did not act in good faith in the reasonable belief that the action was in the best interests of the Company. The maximum potential amount of future payments the Company could be required to make under these provisions is unlimited. The Company has never incurred significant costs related to these indemnification provisions. As a result, the Company believes the estimated fair value of these provisions is minimal.
	In the ordinary course of business, the Company may accept standard limited indemnification provisions in connection with the sale of its products, whereby it indemnifies its customers for certain direct damages incurred in connection with third-party patent or other intellectual property infringement claims with respect to the use of the Company’s products. The term of these indemnification provisions generally coincides with the customer’s use of the Company’s products. The maximum potential amount of future payments the Company could be required to make under these provisions is generally subject to fixed monetary limits. The Company has never incurred significant costs to defend lawsuits or settle claims related to these indemnification provisions. As a result, the Company believes the estimated fair value of these provisions is minimal.
	In the ordinary course of business, the Company also accepts limited indemnification provisions from time to time, whereby it indemnifies customers for certain direct damages incurred in connection with bodily injury and property damage arising from the installation of the Company’s products. The term of these indemnification provisions generally coincides with the period of installation. The maximum potential amount of future payments the Company could be required to make under these provisions is generally limited and is likely recoverable under the Company’s insurance policies. As a result of this coverage, and the fact that the Company has never incurred significant costs to defend lawsuits or settle claims related to these indemnification provisions, the Company believes the estimated fair value of these provisions is minimal.

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	The Company is exposed to certain risks relating to its ongoing business operations including foreign currency exchange rate risk and interest rate risk. The Company currently mitigates certain foreign currency exchange rate risks with derivative instruments. The Company does not currently manage its interest rate risk with derivative instruments.
	The Company faces exposure to foreign currency exchange rate fluctuations, as a significant portion of its revenues, expenses, assets, and liabilities are denominated in currencies other than the functional currencies of the Company’s subsidiaries or the reporting currency of the Company, which is the U.S. Dollar. The Company faces two types of foreign currency exchange rate exposures:

	•	Transactional currency/functional currency exchange rate exposures from transactions that are denominated in currencies other than the functional currency of the subsidiary. These transaction gains and losses are reported in "Foreign currency gain (loss)" on the Consolidated Statements of Operations.

	•	Functional currency/reporting currency exchange rate exposures from the revaluation of the assets and liabilities of our foreign subsidiaries, whose functional currency is generally their local currency, to the Company’s reporting currency, which is the U.S. Dollar. These translation gains and losses are reported in “Accumulated other comprehensive loss” on the Consolidated Balance Sheets and also on the Consolidated Statements of Comprehensive Income.
	The Company’s foreign currency risk management strategy is principally designed to mitigate the potential financial impact of changes in the value of transactions and balances denominated in foreign currencies resulting from changes in foreign currency exchange rates. Currently, the Company enters into two types of hedges to manage this risk. The first are economic hedges which utilize foreign currency forward contracts with maturities of up to 45 days to manage the exposure to fluctuations in foreign currency exchange rates arising primarily from foreign-denominated receivables and payables. The gains and losses on these derivatives are largely offset by changes in the fair value of the assets and liabilities being hedged. The second are cash flow hedges which utilize foreign currency forward contracts with maturities of up to 18 months to hedge specific forecasted transactions of the Company's foreign subsidiaries with the goal of protecting our budgeted revenues and expenses against foreign currency exchange rate changes compared to our budgeted rates.
	The Company had the following outstanding forward contracts that were entered into to mitigate foreign currency exchange rate risk (in thousands):


		As of March 30, 2014							As of December 31, 2013
	Currency	Notional			USD				Notional			USD
		Value			Equivalent				Value			Equivalent
	Derivatives Designated as Hedging Instruments:
	Japanese Yen	665,000			$	6,514			625,000			$	6,122

	Hungarian Forint	639,750			2,872				570,175			2,603

	Singapore Dollar	3,049			2,472				2,867			2,346

	British Pound	673			1,112				613			1,010

	Canadian Dollar	1,199			1,107				985			932

	Derivatives Not Designated as Hedging Instruments:
	Euro	—			$	—			2,828			$	3,887

	Japanese Yen	—			—				294,500			2,797

	British Pound	—			—				1,100			1,820

	Chinese Renminbi	—			—				9,000			1,467

	Taiwanese Dollar	—			—				27,000			908

	Korean Won	—			—				650,000			620

	Hungarian Forint	—			—				123,000			568

	Brazilian Real	—			—				250			106

	Information regarding the fair value of the outstanding forward contracts was as follows (in thousands):


		Asset Derivatives										Liability Derivatives
		Balance		Fair Value								Balance		Fair Value
		Sheet		30-Mar-14				31-Dec-13				Sheet		30-Mar-14				31-Dec-13
		Location										Location
	Derivatives Designated as Hedging Instruments:
	Cash flow hedge forward contracts	Prepaid expenses and		$	33			$	204			Accrued		$	112			$	98
		other current assets										expenses
	Derivatives Not Designated as Hedging Instruments:
	Economic hedge forward contracts	Prepaid expenses and		$	—			$	6			Accrued expenses		$	—			$	24
		other current assets
	The table below details the gross activity for all derivative assets and liabilities which were presented on a net basis on the Consolidated Balance Sheets due to the right of offset with one counterparty (in thousands):


	Asset Derivatives										Liability Derivatives
			March 30, 2014				December 31, 2013						March 30, 2014				December 31, 2013
	Gross amounts of recognized assets		$	38			$	210			Gross amounts of recognized liabilities		$	128			$	122

	Gross amounts offset		(5		)		—				Gross amounts offset		(16		)		—

Net amount of assets presented		33				210				Net amount of liabilities presented		112				122

Information regarding the effect of derivative instruments, net of the underlying exposure, on the consolidated financial statements was as follows (in thousands):


	Location in Financial Statements		Three-months Ended
			30-Mar-14				31-Mar-13
Derivatives Designated as Hedging Instruments:
Gains (losses) in Shareholders' equity on derivatives (effective portion)	Accumulated other comprehensive income (loss), net of tax		$	(62	)		$	—

Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	Product revenue		$	13			$	—

	Research, development, and engineering expenses		(30		)		—

	Selling, general, and administrative expenses		(16		)		—

	Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income		$	(33	)		$	—

Gains (losses) recognized in net income on derivatives (ineffective portion and discontinued derivatives)	Foreign currency gain (loss)		$	—			$	—

Derivatives Not Designated as Hedging Instruments:
Gains (losses) recognized in net income	Foreign currency gain (loss)		$	(152	)		$	203

The following table provides the changes in accumulated other comprehensive income (loss), net of tax, related to derivative instruments (in thousands):


	Three-months ended
	30-Mar-14				31-Mar-13
Beginning balance	$	104			$	—

Amount of loss (gain) reclassified to net income	33				—

Change in fair value of derivative instruments	(199		)		—

Ending balance	$	(62	)		$	—

Net losses expected to be reclassified from accumulated other comprehensive income (loss), net of tax, into net income within the next twelve months are $66,000.

StockBased_Compensation_Expens

Stock-Based Compensation Expense	3 Months Ended
	Mar. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation Expense	'
	The Company’s share-based payments that result in compensation expense consist solely of stock option grants. As of March 30, 2014, the Company had 10,024,230 shares available for grant. Generally, stock options are granted with an exercise price equal to the market value of the Company’s common stock at the grant date, vest over four years based upon continuous service, and expire ten years from the grant date.
	The following table summarizes the Company’s stock option activity for the three-month period ended March 30, 2014:


		Shares		Weighted-			Weighted-	Aggregate
		(in thousands)		Average			Average	Intrinsic
				Exercise			Remaining	Value
				Price			Contractual	(in thousands)
							Term (in years)
	Outstanding as of December 31, 2013	6,138		$	15.65

	Granted	1,206		39.31

	Exercised	(396	)	15.02

	Forfeited or expired	(73	)	18.02

	Outstanding as of March 30, 2014	6,875		$	19.8		7.4	$	98,435

	Exercisable as of March 30, 2014	2,481		$	13.59		5.8	$	48,212

	Options vested or expected to vest at	6,130		$	18.93		7.2	$	92,123
	March 30, 2014 (1)
	(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
	The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:


		Three-months Ended
		30-Mar-14		31-Mar-13
	Risk-free rate	2.7	%	2.1	%
	Expected dividend yield	—	%	—	%
	Expected volatility	41	%	42	%
	Expected term (in years)	5.4		5.9

	Risk-free rate
	The risk-free rate was based upon a treasury instrument whose term was consistent with the contractual term of the option.
	Expected dividend yield
	Generally, the current dividend yield is calculated by annualizing the cash dividend declared by the Company’s Board of Directors and dividing that result by the closing stock price on the grant date. However, in the fourth quarter of 2012, the Company paid the full annual dividends for 2013 and 2014 in advance, and therefore, the dividend yield for those years has been adjusted to zero. At the time of the 2014 valuation, a dividend yield of 0.56% was estimated for future periods from 2015 through the expected life of the option.
	Expected volatility
	The expected volatility was based upon a combination of historical volatility of the Company’s common stock over the contractual term of the option and implied volatility for traded options of the Company’s stock.
	Expected term
	The expected term was derived from the binomial lattice model from the impact of events that trigger exercises over time.
	The weighted-average grant-date fair values of stock options granted during the three-month periods ended March 30, 2014 and March 31, 2013 were $15.34 and $8.07, respectively.
	The Company stratifies its employee population into two groups: one consisting of senior management and another consisting of all other employees. The Company currently expects that approximately 72% of its stock options granted to senior management and 70% of its options granted to all other employees will actually vest. Therefore, the Company currently applies an estimated annual forfeiture rate of 11% to all unvested options for senior management and a rate of 12% for all other employees. The Company revised its estimated forfeiture rates in the first quarters of 2014 and 2013, resulting in an increase to compensation expense of $288,000 and $300,000, respectively.
	The total stock-based compensation expense and the related income tax benefit recognized for the three-month period ended March 30, 2014 were $4,004,000 and $1,306,000, respectively, and for the three-month period ended March 31, 2013 were $3,298,000 and $1,094,000, respectively. No compensation expense was capitalized as of March 30, 2014 or December 31, 2013.
	The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):


		Three-months Ended
		30-Mar-14			31-Mar-13
	Product cost of revenue	$	285		$	227

	Service cost of revenue	63			63

	Research, development, and engineering	1,056			813

	Selling, general, and administrative	2,600			2,195

		$	4,004		$	3,298

	The total intrinsic values of stock options exercised for the three-month periods ended March 30, 2014 and March 31, 2013 were $8,933,000 and $7,193,000, respectively. The total fair values of stock options vested for the three-month periods ended March 30, 2014 and March 31, 2013 were $8,361,000 and $6,932,000, respectively.
	As of March 30, 2014, total unrecognized compensation expense related to non-vested stock options was $19,791,000, which is expected to be recognized over a weighted-average period of 1.60 years.

Stock_Repurchase_Program

Stock Repurchase Program	3 Months Ended
Stock Repurchase Program	Mar. 30, 2014
Equity [Abstract]	'
Stock Repurchase Program	'
Stock Repurchase Program	In April 2008, the Company’s Board of Directors authorized the repurchase of up to $50,000,000 of the Company’s common stock, primarily as a means to reduce the dilutive effect of employee stock options. Stock repurchases under this program were completed in 2013. In November 2011, the Company’s Board of Directors authorized the repurchase of up to $80,000,000 of the Company’s common stock to help reduce the dilutive effect of employee stock options. Purchases under this 2011 program began in 2013 upon completion of the 2008 program. As of March 30, 2014, the Company repurchased a total of 1,272,000 shares at a cost of $42,195,000, including 380,000 shares at a cost of $14,287,000 in the first quarter of 2014. On April 29, 2014, the Company's Board of Directors authorized the repurchase of an additional $50,000,000 of the Company's stock. This new authorization will commence once the Company completes the November 2011 program. The Company may repurchase shares under this program in future periods depending upon a variety of factors, including, among other things, the impact of dilution from employee stock options, stock price, share availability, and cash requirements.

Taxes

Taxes	3 Months Ended
Taxes	Mar. 30, 2014
Income Tax Disclosure [Abstract]	'
Taxes	'
	A reconciliation of the United States federal statutory corporate tax rate to the Company’s effective tax rate, or income tax provision, was as follows:


		Three-months Ended
		30-Mar-14		31-Mar-13
	Income tax provision at federal statutory rate	35	%	35	%
	State income taxes, net of federal benefit	1	%	2	%
	Foreign tax rate differential	(17	)%	(17	)%
	Tax credit	—	%	(1	)%
	Discrete tax events	—	%	(3	)%
	Income tax provision	19	%	16	%
	The effective tax rate for the three-month period ended March 31, 2013 included a discrete event that decreased tax expense by $555,000, net of related reserves for income taxes, from the retroactive application of the 2012 research and development credit. The American Taxpayer Relief Act of 2012 was passed by Congress and signed into law on January 1, 2013. The provisions under this law were applied retroactively to January 1, 2012. As a result of the law being signed on January 1, 2013, the financial impact of the retroactive provision was recorded as a discrete event in the first quarter of 2013. This discrete tax event decreased the effective tax rate from a provision of 19% to a provision of 16% for the first quarter of 2013.
	During the three-month period ended March 30, 2014, the Company recorded a $175,000 increase in reserves for income taxes, net of deferred tax benefit, for uncertain tax positions that were recorded as income tax expense. Estimated interest and penalties included in these amounts totaled $40,000 for the three-month period ended March 30, 2014.
	In the first quarter of 2014, management adopted Accounting Standards Update (ASU) 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists." This ASU requires companies to present an unrecognized tax benefit, or a portion thereof, as a reduction to a deferred tax asset for a net operating loss (NOL) carryforward or a similar tax loss or tax credit carryforward. During the three-month period ended March 30, 2014, the Company reclassified a reserve for income taxes of $1,028,000 as a reduction to noncurrent deferred tax assets in compliance with this new guidance. Retroactive application was not required under this ASU, and therefore, prior periods were not restated.
	The Company’s reserve for income taxes, including gross interest and penalties, was $4,967,000 as of March 30, 2014, which included $3,939,000 classified as a noncurrent liability and $1,028,000 recorded as a reduction to noncurrent deferred tax assets. The amount of gross interest and penalties included in these balances was $415,000. If the Company’s tax positions were sustained or the statutes of limitations related to certain positions expired, these reserves would be released and income tax expense would be reduced in a future period, less $451,000 that would be recorded through additional paid-in capital. As a result of the expiration of certain statutes of limitations and the conclusion of an IRS examination, there is a potential that a portion of these reserves could be released, which would decrease income tax expense by approximately $700,000 to $800,000 over the next twelve months.
	The Company has defined its major tax jurisdictions as the United States, Ireland, China, and Japan, and within the United States, Massachusetts and California. Within the United States, the tax years 2012 through 2013 remain open to examination by various taxing authorities, while the tax years 2009 through 2013 remain open to examination by various taxing authorities in other jurisdictions in which the Company operates.

WeightedAverage_Shares

Weighted-Average Shares	3 Months Ended
	Mar. 30, 2014
Earnings Per Share [Abstract]	'
Weighted-Average Shares	'
	In July 2013, the Company’s Board of Directors declared a two-for-one stock split of the Company’s common stock, which was effected through a stock dividend distributed on September 16, 2013. All references made to share or per share amounts in the accompanying consolidated financial statements and applicable disclosures reflect this two-for-one stock split.
	Weighted-average shares were calculated as follows (in thousands):


		Three-months Ended
		30-Mar-14	31-Mar-13
	Basic weighted-average common shares outstanding	86,879	86,522

	Effect of dilutive stock options	2,380	1,738

	Weighted-average common and common-equivalent shares outstanding	89,259	88,260

	Stock options to purchase 585,208 and 965,938 shares of common stock, on a weighted-average basis, were outstanding for the quarters ended March 30, 2014 and March 31, 2013, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive.

Segment_Information

Segment Information	3 Months Ended
	Mar. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	The Company has two reportable segments: the Modular Vision Systems Division (MVSD) and the Surface Inspection Systems Division (SISD). MVSD develops, manufactures, and markets modular vision systems that are used to control the manufacture of discrete items by locating, identifying, inspecting, and measuring them during the manufacturing process. SISD develops, manufactures, and markets surface inspection vision systems that are used to inspect surfaces of materials processed in a continuous fashion, such as metals, paper, nonwoven, plastics, and glass, to ensure there are no flaws or defects on the surfaces. Segments are determined based upon the way that management organizes its business for making operating decisions and assessing performance. The Company evaluates segment performance based upon income or loss from operations, excluding stock-based compensation expense.
	The following table summarizes information about the segments (in thousands):


	Three-months Ended	MVSD		SISD		Reconciling Items			Consolidated
	March 30, 2014
	Product revenue	$	77,618	$	5,951	$	—		$	83,569

	Service revenue	3,698		3,662		—			7,360

	Operating income	28,292		1,013		(6,862		)	22,443




	Three-months Ended	MVSD		SISD		Reconciling Items			Consolidated
	March 31, 2013
	Product revenue	$	68,319	$	6,353	$	—		$	74,672

	Service revenue	2,092		4,128		—			$	6,220

	Operating income	22,076		1,732		(5,827		)	$	17,981

	Reconciling items consist of stock-based compensation expense and unallocated corporate expenses, which primarily include corporate headquarters costs, professional fees, and patent infringement litigation. Additional asset information by segment is not produced internally for use by the chief operating decision maker, and therefore, is not presented. Additional asset information is not provided because cash and investments are commingled and the segments share assets and resources in a number of locations around the world.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on a Recurring Basis	'
	The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of March 30, 2014 (in thousands):


		Quoted Prices in		Significant Other
		Active Markets		Observable
		for Identical		Inputs (Level 2)
		Assets (Level 1)
	Assets:
	Money market instruments	$	5,723	$	—

	Corporate bonds	—		224,352

	Treasury bills	—		86,804

	Asset-backed securities	—		74,885

	Sovereign bonds	—		20,417

	Municipal bonds	—		11,779

	Agency bonds	—		1,500

	Cash flow hedge forward contracts	—		33

	Liabilities:
	Cash flow hedge forward contracts	—		112

Cash_Cash_Equivalents_and_Inve1

Cash, Cash Equivalents, and Investments (Tables)	3 Months Ended
	Mar. 30, 2014
Cash and Cash Equivalents [Abstract]	'
Components of Cash, Cash Equivalents, and Investments	'
	Cash, cash equivalents, and investments consisted of the following (in thousands):


		30-Mar-14		31-Dec-13
	Cash	$	36,740	$	40,124

	Money market instruments	5,723		520

	Cash and cash equivalents	42,463		40,644

	Corporate bonds	33,585		109,040

	Municipal bonds	4,766		9,276

	Sovereign bonds	3,016		11,448

	Asset-backed securities	410		53,559

	Agency bonds	—		1,499

	Short-term investments	41,777		184,822

	Corporate bonds	190,767		109,909

	Treasury bills	86,804		73,666

	Asset-backed securities	74,475		21,820

	Sovereign bonds	17,401		16,385

	Municipal bonds	7,013		5,919

	Agency bonds	1,500		—

	Limited partnership interest	1,956		1,956

	Long-term investments	379,916		229,655

		$	464,156	$	455,121

Summary of Available-for-Sale Investments	'
	The following table summarizes the Company’s available-for-sale investments as of March 30, 2014 (in thousands):


		Amortized		Gross			Gross			Fair Value
		Cost		Unrealized			Unrealized
				Gains			Losses
	Short-term:
	Corporate bonds	$	33,480	$	105		$	—		$	33,585

	Municipal bonds	4,758		8			—			4,766

	Sovereign bonds	2,996		20			—			3,016

	Asset-backed securities	410		—			—			410

	Long-term:
	Corporate bonds	190,185		680			(98		)	190,767

	Treasury bills	86,941		2			(139		)	86,804

	Asset-backed securities	74,471		69			(65		)	74,475

	Sovereign bonds	17,367		52			(18		)	17,401

	Municipal bonds	6,968		45			—			7,013

	Agency bonds	1,500		—			—			1,500

		$	419,076	$	981		$	(320	)	$	419,737

Gross Unrealized Losses and Fair Values for Available-for-Sale Investments	'
	The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of March 30, 2014 (in thousands):


		Unrealized Loss Position For:
		Less than 12 Months					12 Months or Greater						Total
		Fair Value		Unrealized			Fair Value			Unrealized			Fair Value		Unrealized
				Losses						Losses					Losses
	Corporate bonds	$	55,024	$	(98	)	$	—		$	—		$	55,024	$	(98	)

	Asset-backed securities	23,535		(38		)	8,456			(27		)	31,991		(65		)

	Sovereign bonds	3,347		(18		)	—			—			3,347		(18		)

	Treasury bills	82,753		(139		)	—			—			82,753		(139		)

		$	164,659	$	(293	)	$	8,456		$	(27	)	$	173,115	$	(320	)

Effective Maturity Dates of Available-for-Sale Investments	'
	The following table presents the effective maturity dates of the Company’s available-for-sale investments as of March 30, 2014 (in thousands):


		1		2-Jan			3-Feb			4-Mar			5-Apr		5-8 Years			Total
		Year or Less		Years			Years			Years			Years
	Corporate bonds	$	33,585	$	64,435		$	94,424		$	2,428		$	29,480	$	—		$	224,352

	Treasury bills	—		32,317			54,487			—			—		—			86,804

	Asset-backed securities	410		5,287			14,663			29,396			21,243		3,886			74,885

	Sovereign bonds	3,016		12,502			4,899			—			—		—			20,417

	Municipal bonds	4,766		3,981			1,475			1,557			—		—			11,779

	Agency bonds	—		—			1,500			—			—		—			1,500

		$	41,777	$	118,522		$	171,448		$	33,381		$	50,723	$	3,886		$	419,737

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories consisted of the following (in thousands):


		30-Mar-14		31-Dec-13
	Raw materials	$	12,958	$	13,101

	Work-in-process	7,521		4,472

	Finished goods	7,955		8,121

		$	28,434	$	25,694

Warranty_Obligations_Tables

Warranty Obligations (Tables)	3 Months Ended
	Mar. 30, 2014
Guarantees [Abstract]	'
Changes in Warranty Obligations	'
	The changes in the warranty obligations were as follows (in thousands):


	Balance as of December 31, 2013	$	3,016

	Provisions for warranties issued during the period	759

	Fulfillment of warranty obligations	(524		)
	Foreign exchange rate changes	8

	Balance as of March 30, 2014	$	3,259

Guarantees_Tables

Guarantees (Tables)	3 Months Ended
	Mar. 30, 2014
Guarantees [Abstract]	'
Details of Letters of Credit Outstanding	'
	The following table details the letters of credit outstanding as of March 30, 2014:


	Type	Guarantee		Guarantee Due Date
		Amount
		(in thousands)
	Warranty bonds	$	976	Various from April 2014 to June 2016

	Performance bonds	398		Various from June 2014 to July 2016

	Bank guarantees	373		Various from April 2014 to July 2014

		$	1,747

Derivative_Instruments_Tables

Derivative Instruments (Tables)	3 Months Ended
	Mar. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Outstanding Forward Contracts Table	'
	The Company had the following outstanding forward contracts that were entered into to mitigate foreign currency exchange rate risk (in thousands):


		As of March 30, 2014							As of December 31, 2013
	Currency	Notional			USD				Notional		USD
		Value			Equivalent				Value		Equivalent
	Derivatives Designated as Hedging Instruments:
	Japanese Yen	665,000			$	6,514			625,000		$	6,122

	Hungarian Forint	639,750			2,872				570,175		2,603

	Singapore Dollar	3,049			2,472				2,867		2,346

	British Pound	673			1,112				613		1,010

	Canadian Dollar	1,199			1,107				985		932

	Derivatives Not Designated as Hedging Instruments:
	Euro	—			$	—			2,828		$	3,887

	Japanese Yen	—			—				294,500		2,797

	British Pound	—			—				1,100		1,820

	Chinese Renminbi	—			—				9,000		1,467

	Taiwanese Dollar	—			—				27,000		908

	Korean Won	—			—				650,000		620

	Hungarian Forint	—			—				123,000		568

	Brazilian Real	—			—				250		106

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	'
	Information regarding the fair value of the outstanding forward contracts was as follows (in thousands):


		Asset Derivatives									Liability Derivatives
		Balance		Fair Value							Balance		Fair Value
		Sheet		30-Mar-14				31-Dec-13			Sheet		30-Mar-14			31-Dec-13
		Location									Location
	Derivatives Designated as Hedging Instruments:
	Cash flow hedge forward contracts	Prepaid expenses and		$	33			$	204		Accrued		$	112		$	98
		other current assets									expenses
	Derivatives Not Designated as Hedging Instruments:
	Economic hedge forward contracts	Prepaid expenses and		$	—			$	6		Accrued expenses		$	—		$	24
		other current assets
Offsetting Assets	'
	The table below details the gross activity for all derivative assets and liabilities which were presented on a net basis on the Consolidated Balance Sheets due to the right of offset with one counterparty (in thousands):


	Asset Derivatives									Liability Derivatives
			March 30, 2014				December 31, 2013					March 30, 2014			December 31, 2013
	Gross amounts of recognized assets		$	38			$	210		Gross amounts of recognized liabilities		$	128		$	122

	Gross amounts offset		(5		)		—			Gross amounts offset		(16		)	—

	Net amount of assets presented		33				210			Net amount of liabilities presented		112			122

Derivative Instruments, Gain (Loss)	'
	Information regarding the effect of derivative instruments, net of the underlying exposure, on the consolidated financial statements was as follows (in thousands):


		Location in Financial Statements		Three-months Ended
				30-Mar-14				31-Mar-13
	Derivatives Designated as Hedging Instruments:
	Gains (losses) in Shareholders' equity on derivatives (effective portion)	Accumulated other comprehensive income (loss), net of tax		$	(62	)		$	—

	Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	Product revenue		$	13			$	—

		Research, development, and engineering expenses		(30		)		—

		Selling, general, and administrative expenses		(16		)		—

		Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income		$	(33	)		$	—

	Gains (losses) recognized in net income on derivatives (ineffective portion and discontinued derivatives)	Foreign currency gain (loss)		$	—			$	—

	Derivatives Not Designated as Hedging Instruments:
	Gains (losses) recognized in net income	Foreign currency gain (loss)		$	(152	)		$	203

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	'
	The following table provides the changes in accumulated other comprehensive income (loss), net of tax, related to derivative instruments (in thousands):


		Three-months ended
		30-Mar-14				31-Mar-13
	Beginning balance	$	104			$	—

	Amount of loss (gain) reclassified to net income	33				—

	Change in fair value of derivative instruments	(199		)		—

	Ending balance	$	(62	)		$	—

StockBased_Compensation_Expens1

Stock-Based Compensation Expense (Tables)	3 Months Ended
	Mar. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Stock Option Activity	'
	The following table summarizes the Company’s stock option activity for the three-month period ended March 30, 2014:


		Shares		Weighted-			Weighted-	Aggregate
		(in thousands)		Average			Average	Intrinsic
				Exercise			Remaining	Value
				Price			Contractual	(in thousands)
							Term (in years)
	Outstanding as of December 31, 2013	6,138		$	15.65

	Granted	1,206		39.31

	Exercised	(396	)	15.02

	Forfeited or expired	(73	)	18.02

	Outstanding as of March 30, 2014	6,875		$	19.8		7.4	$	98,435

	Exercisable as of March 30, 2014	2,481		$	13.59		5.8	$	48,212

	Options vested or expected to vest at	6,130		$	18.93		7.2	$	92,123
	March 30, 2014 (1)
	(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted	'
	The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:


		Three-months Ended
		30-Mar-14		31-Mar-13
	Risk-free rate	2.7	%	2.1	%
	Expected dividend yield	—	%	—	%
	Expected volatility	41	%	42	%
	Expected term (in years)	5.4		5.9

Stock-Based Compensation Expense	'
	The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):


		Three-months Ended
		30-Mar-14			31-Mar-13
	Product cost of revenue	$	285		$	227

	Service cost of revenue	63			63

	Research, development, and engineering	1,056			813

	Selling, general, and administrative	2,600			2,195

		$	4,004		$	3,298

Taxes_Tables

Taxes (Tables)	3 Months Ended
Taxes (Tables)	Mar. 30, 2014
Income Tax Disclosure [Abstract]	'
Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision	'
	A reconciliation of the United States federal statutory corporate tax rate to the Company’s effective tax rate, or income tax provision, was as follows:


		Three-months Ended
		30-Mar-14		31-Mar-13
	Income tax provision at federal statutory rate	35	%	35	%
	State income taxes, net of federal benefit	1	%	2	%
	Foreign tax rate differential	(17	)%	(17	)%
	Tax credit	—	%	(1	)%
	Discrete tax events	—	%	(3	)%
	Income tax provision	19	%	16	%

WeightedAverage_Shares_Tables

Weighted-Average Shares (Tables)	3 Months Ended
	Mar. 30, 2014
Earnings Per Share [Abstract]	'
Calculation of Weighted-Average Shares	'
	Weighted-average shares were calculated as follows (in thousands):


		Three-months Ended
		30-Mar-14	31-Mar-13
	Basic weighted-average common shares outstanding	86,879	86,522

	Effect of dilutive stock options	2,380	1,738

	Weighted-average common and common-equivalent shares outstanding	89,259	88,260

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 30, 2014
Segment Reporting [Abstract]	'
Information About Segments	'
	The following table summarizes information about the segments (in thousands):


	Three-months Ended	MVSD		SISD		Reconciling Items			Consolidated
	March 30, 2014
	Product revenue	$	77,618	$	5,951	$	—		$	83,569

	Service revenue	3,698		3,662		—			7,360

	Operating income	28,292		1,013		(6,862		)	22,443




	Three-months Ended	MVSD		SISD		Reconciling Items			Consolidated
	March 31, 2013
	Product revenue	$	68,319	$	6,353	$	—		$	74,672

	Service revenue	2,092		4,128		—			$	6,220

	Operating income	22,076		1,732		(5,827		)	$	17,981

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Assets:	'	'
Money market instruments	$5,723	$520
Financial assets at fair value	419,737	'
Corporate Bonds	'	'
Assets:	'	'
Financial assets at fair value	224,352	'
Asset-Backed Securities	'	'
Assets:	'	'
Financial assets at fair value	74,885	'
Treasury Bills	'	'
Assets:	'	'
Financial assets at fair value	86,804	'
Sovereign Bonds	'	'
Assets:	'	'
Financial assets at fair value	20,417	'
Municipal Bonds	'	'
Assets:	'	'
Financial assets at fair value	11,779	'
Agency Bonds	'	'
Assets:	'	'
Financial assets at fair value	1,500	'
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fair Value, Measurements, Recurring	'	'
Assets:	'	'
Money market instruments	5,723	'
Foreign Currency Cash Flow Hedge Asset at Fair Value	'	'
Liabilities:	'	'
Currency forward contracts	'	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring	'	'
Assets:	'	'
Money market instruments	0	'
Foreign Currency Cash Flow Hedge Asset at Fair Value	33	'
Liabilities:	'	'
Currency forward contracts	112	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Corporate Bonds	'	'
Assets:	'	'
Financial assets at fair value	224,352	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Asset-Backed Securities	'	'
Assets:	'	'
Financial assets at fair value	74,885	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Treasury Bills	'	'
Assets:	'	'
Financial assets at fair value	86,804	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Sovereign Bonds	'	'
Assets:	'	'
Financial assets at fair value	20,417	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Municipal Bonds	'	'
Assets:	'	'
Financial assets at fair value	11,779	'
Significant Other Observable Inputs (Level 2) \| Fair Value, Measurements, Recurring \| Agency Bonds	'	'
Assets:	'	'
Financial assets at fair value	$1,500	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 30, 2014
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Other-than-temporary impairment loss	$0
Fair Value, Measurements, Nonrecurring	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Other-than-temporary impairment loss	0
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3)	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Other-than-temporary impairment loss	$0

Cash_Cash_Equivalents_and_Inve2

Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) (USD $)	Mar. 30, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Cash	$36,740	$40,124	'	'
Money market instruments	5,723	520	'	'
Cash and cash equivalents	42,463	40,644	42,757	45,160
Short-term investments	41,777	184,822	'	'
Limited partnership interest	1,956	1,956	'	'
Long-term investments	379,916	229,655	'	'
Total	464,156	455,121	'	'
Corporate Bonds	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Short-term investments	33,585	109,040	'	'
Long-term investments	190,767	109,909	'	'
Treasury Bills	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Long-term investments	86,804	73,666	'	'
Municipal Bonds	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Short-term investments	4,766	9,276	'	'
Long-term investments	7,013	5,919	'	'
Asset-Backed Securities	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Short-term investments	410	53,559	'	'
Long-term investments	74,475	21,820	'	'
Sovereign Bonds	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Short-term investments	3,016	11,448	'	'
Long-term investments	17,401	16,385	'	'
Agency Bonds	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Short-term investments	0	1,499	'	'
Long-term investments	$1,500	$0	'	'

Cash_Cash_Equivalents_and_Inve3

Cash, Cash Equivalents, and Investments - Summary of Available-for-Sale Investments (Detail) (USD $)	Mar. 30, 2014
In Thousands, unless otherwise specified	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	$419,076
Gross Unrealized Gains	981
Gross Unrealized Losses	-320
Fair Value	419,737
Corporate Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
Gross Unrealized Losses	-98
Corporate Bonds \| Short-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	33,480
Gross Unrealized Gains	105
Gross Unrealized Losses	0
Fair Value	33,585
Corporate Bonds \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	190,185
Gross Unrealized Gains	680
Gross Unrealized Losses	-98
Fair Value	190,767
Asset-Backed Securities	'
Schedule of Available-for-sale Securities [Line Items]	'
Gross Unrealized Losses	-65
Asset-Backed Securities \| Short-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	410
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	410
Asset-Backed Securities \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	74,471
Gross Unrealized Gains	69
Gross Unrealized Losses	-65
Fair Value	74,475
Municipal Bonds \| Short-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	4,758
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Fair Value	4,766
Municipal Bonds \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	6,968
Gross Unrealized Gains	45
Gross Unrealized Losses	0
Fair Value	7,013
Treasury Bills	'
Schedule of Available-for-sale Securities [Line Items]	'
Gross Unrealized Losses	-139
Treasury Bills \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	86,941
Gross Unrealized Gains	2
Gross Unrealized Losses	-139
Fair Value	86,804
Sovereign Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
Gross Unrealized Losses	-18
Sovereign Bonds \| Short-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	2,996
Gross Unrealized Gains	20
Gross Unrealized Losses	0
Fair Value	3,016
Sovereign Bonds \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	17,367
Gross Unrealized Gains	52
Gross Unrealized Losses	-18
Fair Value	17,401
Agency Bonds \| Long-Term Investments [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	1,500
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	$1,500

Cash_Cash_Equivalents_and_Inve4

Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) (USD $)	Mar. 30, 2014
In Thousands, unless otherwise specified	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value, Less than 12 Months	$164,659
Unrealized Losses, Less than 12 Months	-293
Fair Value, 12 Months or Greater	8,456
Unrealized Losses, 12 Months or Greater	-27
Total Fair Value	173,115
Total Unrealized Losses	-320
Corporate Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value, Less than 12 Months	55,024
Unrealized Losses, Less than 12 Months	-98
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Total Fair Value	55,024
Total Unrealized Losses	-98
Asset-Backed Securities	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value, Less than 12 Months	23,535
Unrealized Losses, Less than 12 Months	-38
Fair Value, 12 Months or Greater	8,456
Unrealized Losses, 12 Months or Greater	-27
Total Fair Value	31,991
Total Unrealized Losses	-65
Sovereign Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value, Less than 12 Months	3,347
Unrealized Losses, Less than 12 Months	-18
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Total Fair Value	3,347
Total Unrealized Losses	-18
Treasury Bills	'
Schedule of Available-for-sale Securities [Line Items]	'
Fair Value, Less than 12 Months	82,753
Unrealized Losses, Less than 12 Months	-139
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Total Fair Value	82,753
Total Unrealized Losses	($139)

Cash_Cash_Equivalents_and_Inve5

Cash, Cash Equivalents, and Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross realized gains on sale of investments	$512,000	$50,000
Gross realized losses on sale of investments	11,000	19,000
Maximum amount committed to invest in limited partnership	20,500,000	'
Contribution to limited partnership	19,886,000	'
Remaining amount of commitment in limited partnership	614,000	'
Investment expiration date	31-Dec-15	'
Number of contributions made during the period	0	'
Distributions From Partnership During Period	$0	'

Cash_Cash_Equivalents_and_Inve6

Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) (USD $)	Mar. 30, 2014
In Thousands, unless otherwise specified	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	$41,777
1-2 Years	118,522
2-3 Years	171,448
3-4 Years	33,381
4-5 Years	50,723
5-8 Years	3,886
Fair Value	419,737
Corporate Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	33,585
1-2 Years	64,435
2-3 Years	94,424
3-4 Years	2,428
4-5 Years	29,480
5-8 Years	0
Fair Value	224,352
Treasury Bills	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	0
1-2 Years	32,317
2-3 Years	54,487
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	86,804
Asset-Backed Securities	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	410
1-2 Years	5,287
2-3 Years	14,663
3-4 Years	29,396
4-5 Years	21,243
5-8 Years	3,886
Fair Value	74,885
Sovereign Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	3,016
1-2 Years	12,502
2-3 Years	4,899
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	20,417
Municipal Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	4,766
1-2 Years	3,981
2-3 Years	1,475
3-4 Years	1,557
4-5 Years	0
5-8 Years	0
Fair Value	11,779
Agency Bonds	'
Schedule of Available-for-sale Securities [Line Items]	'
1 Year or Less	0
1-2 Years	0
2-3 Years	1,500
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	$1,500

Inventories_Detail

Inventories (Detail) (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]	'	'
Raw materials	$12,958	$13,101
Work-in-process	7,521	4,472
Finished goods	7,955	8,121
Inventories	$28,434	$25,694

Warranty_Obligations_Changes_i

Warranty Obligations - Changes in Warranty Obligations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014
Payables and Accruals [Abstract]	'
Beginning Balance	$3,016
Provisions for warranties issued during the period	759
Fulfillment of warranty obligations	-524
Foreign exchange rate changes	8
Ending Balance	$3,259

Contingencies_Additional_Infor

Contingencies - Additional Information (Detail)	1 Months Ended
	Jul. 31, 2010	Dec. 31, 2009	Sep. 30, 2009
	Patents	Respondent	Respondent
Leases [Abstract]	'	'	'
Number of respondents with whom a settlement was reached	'	5	2
Number of the company's patents found invalid	2	'	'

Guarantees_Additional_Informat

Guarantees - Additional Information (Detail)	3 Months Ended
	Mar. 30, 2014
	Category
Guarantees [Abstract]	'
Number of categories of letters of credit	3

Guarantees_Details_of_Letters_

Guarantees - Details of Letters of Credit Outstanding (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014
Guarantor Obligations [Line Items]	'
Guarantee Amount	$1,747
Warranty Bonds	'
Guarantor Obligations [Line Items]	'
Guarantee Amount	976
Guarantee due date	'Various from April 2014 to June 2016
Performance Bonds	'
Guarantor Obligations [Line Items]	'
Guarantee Amount	398
Guarantee due date	'Various from June 2014 to July 2016
Bank Guarantees	'
Guarantor Obligations [Line Items]	'
Guarantee Amount	$373
Guarantee due date	'Various from April 2014 to July 2014

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail)	3 Months Ended
Derivative Instruments - Additional Information (Detail)	Mar. 30, 2014
Not Designated as Hedging Instrument	'
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'
Maximum Remaining Maturity of Foreign Currency Derivatives	'45 days
Designated as Hedging Instrument	'
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'
Maximum Length of Time Hedged in Cash Flow Hedge	'18 months

Derivative_Instruments_Outstan

Derivative Instruments - Outstanding Forward Contracts (Detail)

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

Mar. 30, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

Designated as Hedging Instrument

Not Designated as Hedging Instrument

Japanese Yen

Hungarian Forint

Singapore Dollar

British Pound

Canada, Dollars

Japanese Yen

Hungarian Forint

Euro

British Pound

Chinese Renminbi

Taiwanese Dollar

Korea (South), Won

Brazil, Brazil Real

USD ($)

JPY (¥)

USD ($)

JPY (¥)

USD ($)

HUF

USD ($)

HUF

USD ($)

SGD

USD ($)

SGD

USD ($)

GBP (£)

USD ($)

GBP (£)

USD ($)

CAD

USD ($)

CAD

USD ($)

JPY (¥)

USD ($)

JPY (¥)

USD ($)

HUF

USD ($)

HUF

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

GBP (£)

USD ($)

GBP (£)

USD ($)

CNY

USD ($)

CNY

USD ($)

TWD

USD ($)

TWD

USD ($)

KRW

USD ($)

KRW

USD ($)

BRL

USD ($)

BRL

Derivative [Line Items]

Outstanding forward contracts

$6,514

¥ 665,000

$6,122

¥ 625,000

$2,872

639,750

$2,603

570,175

$2,472

3,049

$2,346

2,867

$1,112

£ 673

$1,010

£ 613

$1,107

1,199

$932

985

¥ 0

$2,797

¥ 294,500

$568

123,000

€ 0

$3,887

€ 2,828

£ 0

$1,820

£ 1,100

$1,467

9,000

$908

27,000

$620

650,000

$106

250

Derivative_Instruments_Informa

Derivative Instruments - Information Regarding Fair Value of Forward Contracts Outstanding (Detail) (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset	$33	$210
Derivative Liability	112	122
Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset	33	204
Designated as Hedging Instrument \| Accrued Expenses	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Liability	112	98
Not Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset	0	6
Not Designated as Hedging Instrument \| Accrued Expenses	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Liability	$0	$24

Derivative_Instruments_Assets_

Derivative Instruments - Assets and liabilities presented on a net basis due to the right of setoff (Detail) (USD $)	Mar. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Gross amounts of recognized assets	$38	$210
Gross amounts offset	-5	0
Net amount of assets presented	33	210
Gross amounts of recognized liabilities	128	122
Gross amounts offset	-16	0
Net amount of liabilities presented	$112	$122

Derivative_Instruments_Informa1

Derivative Instruments - Information Regarding Effect of Forward Contracts, Net of Underlying Exposure, on Consolidated Statements of Operations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income	($33)	$0
Designated as Hedging Instrument \| Accumulated other comprehensive income (loss), net of tax	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Gains (losses) in Shareholders' equity on derivatives (effective portion)	-62	0
Designated as Hedging Instrument \| Product revenue	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	13	0
Designated as Hedging Instrument \| Research, development, and engineering expenses	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	-30	0
Designated as Hedging Instrument \| Selling, general, and administrative expenses	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	-16	0
Designated as Hedging Instrument \| Foreign currency gain (loss)	'	'
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations	'	'
Gains (losses) recognized in net income on derivatives (ineffective portion and discontinued derivatives)	0	0
Not Designated as Hedging Instrument \| Foreign currency gain (loss)	'	'
Information regarding the effect of the forward contracts, net of the underlying exposure, on the Consolidated Statements of Operations	'	'
Gains (losses) recognized in net income	($152)	$203

Derivative_Instruments_Effect_

Derivative Instruments - Effect on Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	($29,833)	'
Ending balance	-29,036	'
Losses expected to be reclassified from OCI into Net Income, net of tax, 12 months	-66	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	104	0
Amount of loss (gain) reclassified to net income	33	0
Change in fair value of derivative instruments	-199	0
Ending balance	($62)	$0

StockBased_Compensation_Expens2

Stock-Based Compensation Expense - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Dec. 31, 2013
	group	Mar. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.00%	0.00%	'
Weighted-average grant-date fair values of stock options granted, in dollars per share	$15.34	$8.07	'
Number of groups within the employee population	2	'	'
Percentage of stock options granted to senior management expected to vest	72.00%	'	'
Percentage of stock options granted to all other employees expected to vest	70.00%	'	'
Estimated forfeiture rate for unvested options for senior management	11.00%	'	'
Estimated forfeiture rate for unvested options for all non-senior management	12.00%	'	'
Reduction in compensation expense due to revised estimated forfeiture rates	$288,000	$300,000	'
Stock-based compensation expense	4,004,000	3,298,000	'
Income tax benefit recognized related to stock-based compensation expense	1,306,000	1,094,000	'
Compensation expense was capitalized	0	'	0
Total intrinsic values of stock options exercised	8,933,000	7,193,000	'
Total fair values of stock options vest	8,361,000	6,932,000	'
Share-based compensation expense not yet recognized	$19,791,000	'	'
Share-based compensation expense not yet recognized, period for recognition	'1 year 7 months 6 days	'	'
General Stock Option Plan	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period for stock option plans	'4 years	'	'
Stock Option and Incentive Plan	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period for stock option plans	'4 years	'	'
Expiration period of stock option plan	'10 years	'	'
Employee Stock Option	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares available for grant under stock option plans	10,024,230	'	'
Expiration period of stock option plan	'10 years	'	'
2015 Through Expected Life of Option	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.56%	'	'

StockBased_Compensation_Expens3

Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Outstanding, Shares	6,138
Granted, Shares	1,206
Exercised, Shares	-396
Forfeited or expired, Shares	-73
Outstanding, Shares	6,875
Exercisable, Shares	2,481
Options vested or expected to vest, Shares	6,130	[1]
Outstanding, Weighted-Average Exercise Price, in dollars per share	$15.65
Granted, Weighted-Average Exercise Price, in dollars per share	$39.31
Exercised, Weighted-Average Exercise Price, in dollars per share	$15.02
Forfeited or expired, Weighted-Average Exercise Price, in dollars per share	$18.02
Outstanding, Weighted-Average Exercise Price, in dollars per share	$19.80
Exercisable, Weighted-Average Exercise Price, in dollars per share	$13.59
Options vested or expected to vest, Weighted-Average Exercise Price, in dollars per share	$18.93	[1]
Outstanding, Weighted-Average Remaining Contractual Term	'7 years 5 months 6 days
Exercisable, Weighted-Average Remaining Contractual Term	'5 years 9 months 24 days
Options vested or expected to vest, Weighted-Average Remaining Contractual Term	'7 years 2 months 2 days	[1]
Outstanding, Aggregate Intrinsic Value	$98,435
Exercisable, Aggregate Intrinsic Value	48,212
Options vested or expected to vest, Aggregate Intrinsic Value	$92,123	[1]

[1]	In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

StockBased_Compensation_Expens4

Stock-Based Compensation Expense - Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted (Detail)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Risk-free rate	2.70%	2.10%
Expected dividend yield	0.00%	0.00%
Expected volatility	41.00%	42.00%
Expected term (in years)	'5 years 5 months 6 days	'5 years 10 months 12 days

StockBased_Compensation_Expens5

Stock-Based Compensation Expense - Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Stock-based compensation expense	$4,004	$3,298
Product cost of revenue	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Stock-based compensation expense	285	227
Service cost of revenue	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Stock-based compensation expense	63	63
Research, development, and engineering	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Stock-based compensation expense	1,056	813
Selling, general, and administrative	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Stock-based compensation expense	$2,600	$2,195

Stock_Repurchase_Program_Addit

Stock Repurchase Program - Additional Information (Detail) (USD $)	3 Months Ended	1 Months Ended		3 Months Ended	0 Months Ended
Share data in Thousands, unless otherwise specified	Mar. 30, 2014	Apr. 30, 2008	Nov. 30, 2011	Mar. 30, 2014	Apr. 29, 2014
		Common Stock	Common Stock	Common Stock	Common Stock
		Repurchase Program 2008 [Member]	Repurchase Program 2011 [Member]	Repurchase Program 2011 [Member]	Repurchase Program 2014 [Member]
					Subsequent Event [Member]
Equity [Line Items]	'	'	'	'	'
Repurchase of authorized common stock	'	$50,000,000	$80,000,000	'	$50,000,000
Aggregate shares repurchased	'	'	'	1,272	'
Aggregate shares repurchased, value	'	'	'	42,195,000	'
Repurchase of shares during period	'	'	'	380	'
Repurchase of shares during period, value	$14,287,000	'	'	$14,287,000	'

Taxes_Reconciliation_of_United

Taxes - Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision (Detail)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'	'
Income tax provision at federal statutory rate	35.00%	35.00%
State income taxes, net of federal benefit	1.00%	2.00%
Foreign tax rate differential	-17.00%	-17.00%
Tax credit	0.00%	-1.00%
Discrete tax events	0.00%	-3.00%
Income tax provision	19.00%	16.00%

Taxes_Additional_Information_D

Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013	Dec. 31, 2013
Tax Credit Carryforward [Line Items]	'	'	'
Provision for effective tax rate	19.00%	16.00%	'
Increase (decrease) in liabilities, net of deferred tax benefit, for uncertain tax positions	$175	'	'
Increase (decrease) in interest and penalties	40	'	'
Unrecognized tax benefit shown as a reduction to noncurrent deferred tax assets	1,028	'	'
Liability For Uncertain Tax Positions	4,967	'	'
Reserve for income taxes, total	3,939	'	4,765
Interest and penalties, gross	415	'	'
Reserve for income taxes to be recorded in additional paid in capital	451	'	'
Minimum decrease in income tax expense due to release in reserves	700	'	'
Maximum decrease in income tax expense due to release in reserves	800	'	'
Tax years open to examination by various taxing authorities	'2012 through 2013	'	'
Tax years open to examination by various taxing authorities for other entities	'2009 through 2013	'	'
Research and Development Tax Credit [Member]	'	'	'
Tax Credit Carryforward [Line Items]	'	'	'
Tax credit carryforward	'	555	'

WeightedAverage_Shares_Additio

Weighted-Average Shares - Additional Information (Detail)	1 Months Ended	3 Months Ended
Weighted-Average Shares - Additional Information (Detail)	Jul. 29, 2013	Mar. 30, 2014	Sep. 29, 2013	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'	'	'
Stock split conversion ratio	2	'	2	'
Stock options to purchase anti-dilutive common stock	'	585,208	'	965,938

WeightedAverage_Shares_Calcula

Weighted-Average Shares - Calculation of Weighted-Average Shares (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Basic weighted-average common shares outstanding	86,879	86,522	[1]
Effect of dilutive stock options	2,380	1,738
Weighted-average common and common-equivalent shares outstanding	89,259	88,260	[1]

[1]	Prior period results have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.

Segment_Information_Additional

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 30, 2014
	Segment
Segment Reporting [Abstract]	'
Number of reportable segments	2

Segment_Information_Informatio

Segment Information - Information About Segments (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'
Product revenue	$83,569	$74,672
Service revenue	7,360	6,220
Operating income	22,443	17,981
Operating Segments \| MVSD	'	'
Segment Reporting Information [Line Items]	'	'
Product revenue	77,618	68,319
Service revenue	3,698	2,092
Operating income	28,292	22,076
Operating Segments \| SISD	'	'
Segment Reporting Information [Line Items]	'	'
Product revenue	5,951	6,353
Service revenue	3,662	4,128
Operating income	1,013	1,732
Reconciling Items	'	'
Segment Reporting Information [Line Items]	'	'
Operating income	($6,862)	($5,827)