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Business Acquisitions - Early Discovery Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jun. 27, 2015
Dec. 27, 2014
Apr. 01, 2014
Business Acquisition [Line Items]      
Goodwill $ 317,414 $ 321,077  
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