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Business Acquisitions Early Discovery Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 26, 2015
Dec. 27, 2014
Apr. 01, 2014
Dec. 28, 2013
Business Acquisition [Line Items]        
Goodwill $ 438,829 $ 321,077   $ 230,701
Early Discovery UK        
Business Acquisition [Line Items]        
Current assets (excluding cash)     $ 31,682  
Property, plant and equipment     21,008  
Other long-term assets     11,140  
Definite-lived intangible assets     104,470  
Goodwill     65,235  
Current liabilities     (13,139)  
Long-term liabilities     (36,802)  
Total purchase price allocation     $ 183,594