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Business Acquisitions- WIL Research Pro Forma Financial Information (Details) - WIL Research - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 25, 2016 | Jun. 27, 2015 | Jun. 25, 2016 | Jun. 27, 2015
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 434,917 | $ 390,887 | $ 849,455 | $ 763,723
Net income attributable to common shareholders | $ 44,159 | $ 51,164 | $ 89,222 | $ 77,813
Earnings per common share |  |  |  |
Basic (in dollars per share) | $ 0.94 | $ 1.10 | $ 1.90 | $ 1.67
Diluted (in dollars per share) | $ 0.92 | $ 1.08 | $ 1.87 | $ 1.63

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