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Business Acquisitions and Divestiture - WIL Laboratories, Pro Forma Financial Information (Details) - WIL Research - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 24, 2016	Sep. 24, 2016
Business Acquisition [Line Items]
Revenue	$ 425,720	$ 1,275,175
Net income attributable to common shareholders	$ 39,530	$ 129,050
Earnings per common share
Basic (in dollars per share)	$ 0.84	$ 2.75
Diluted (in dollars per share)	$ 0.82	$ 2.70

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Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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