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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
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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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