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Business Acquisitions EMD Singapore Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013 | Oct. 04, 2013
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 438,829 | $ 321,077 | $ 230,701 |
EMD Singapore |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets (excluding cash) |  |  |  | $ 300
Property, plant and equipment |  |  |  | 154
Definite-lived intangible assets |  |  |  | 1,885
Goodwill |  |  |  | 2,659
Current liabilities |  |  |  | (64)
Total purchase price allocation |  |  |  | $ 4,934

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