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Business Acquisitions Early Discovery Pro Forma Information (Details) - Early Discovery UK - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Business Acquisition [Line Items]    
Revenue $ 1,322,771 $ 1,249,649
Net income attributable to common shareholders $ 128,195 $ 98,508
Earnings per share, basic (in usd per share) $ 2.75 $ 2.06
Earnings per share, diluted (in usd per share) $ 2.70 $ 2.03