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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
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