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Business Acquisitions Celsis Pro Forma Results (Details) - Celsis Group Limited - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Business Acquisition [Line Items]    
Revenue $ 1,380,493 $ 1,329,025
Net income attributable to common shareholders $ 162,672 $ 110,387
Earnings per share, basic (in usd per share) $ 3.50 $ 2.37
Earnings per share, diluted (in usd per share) $ 3.42 $ 2.32