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Business Acquisitions Business Acquisitions - Early Discovery Pro Forma Information (Details) - Argenta and BioFocus [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 27, 2014 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue | $	$ 993,223
Net income attributable to common shareholders | $	$ 101,029
Earnings per common share
Basic (in dollars per share)	$ 2.16
Diluted (in dollars per share)	$ 2.12

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Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted [Abstract]

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 10



-Section 50



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-Subparagraph (h)(2)-(3)



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-Name Accounting Standards Codification



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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Name Accounting Standards Codification



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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Name Accounting Standards Codification



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