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Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Income Statement [Abstract]
Product sales	$ 302,873us-gaap_SalesRevenueGoodsNet	$ 284,795us-gaap_SalesRevenueGoodsNet
Service sales	157,531us-gaap_SalesRevenueServicesNet	145,713us-gaap_SalesRevenueServicesNet
Total net sales	460,404us-gaap_SalesRevenueNet	430,508us-gaap_SalesRevenueNet
Cost of product sales	121,953us-gaap_CostOfGoodsSold	122,475us-gaap_CostOfGoodsSold
Cost of service sales	67,293us-gaap_CostOfServices	65,244us-gaap_CostOfServices
Total cost of sales	189,246us-gaap_CostOfGoodsAndServicesSold	187,719us-gaap_CostOfGoodsAndServicesSold
Gross profit	271,158us-gaap_GrossProfit	242,789us-gaap_GrossProfit
Selling and administrative expenses	119,751us-gaap_SellingGeneralAndAdministrativeExpense	126,635us-gaap_SellingGeneralAndAdministrativeExpense
Research and development expenses	28,951us-gaap_ResearchAndDevelopmentExpense	24,746us-gaap_ResearchAndDevelopmentExpense
Purchased intangibles amortization	2,474us-gaap_AmortizationOfAcquisitionCosts	2,647us-gaap_AmortizationOfAcquisitionCosts
Operating income	119,982us-gaap_OperatingIncomeLoss	88,761us-gaap_OperatingIncomeLoss
Interest expense	(8,975)us-gaap_InterestExpense	(7,489)us-gaap_InterestExpense
Interest income	2,340us-gaap_InvestmentIncomeInterest	1,458us-gaap_InvestmentIncomeInterest
Income from operations before income taxes	113,347us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82,730us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	17,286us-gaap_IncomeTaxExpenseBenefit	12,428us-gaap_IncomeTaxExpenseBenefit
Net income	$ 96,061us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 70,302us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income per basic common share	$ 1.16us-gaap_EarningsPerShareBasic	$ 0.83us-gaap_EarningsPerShareBasic
Weighted-average number of basic common shares	83,025us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	84,977us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income per diluted common share	$ 1.15us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted
Weighted-average number of diluted common shares and equivalents	83,752us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	85,873us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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