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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

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