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BUSINESS ACQUISITIONS - ChanTest Preliminary Purchase Price (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014 | Oct. 29, 2014
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 787,517 | $ 438,829 | $ 321,077 |
ChanTest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets (excluding cash) |  |  |  | $ 4,669
Property, plant and equipment |  |  |  | 1,637
Definite-lived intangible assets |  |  |  | 23,920
Goodwill |  |  |  | 34,775
Current liabilities |  |  |  | (3,486)
Long-term debt, net and capital leases |  |  |  | (9,486)
Total purchase price allocation |  |  |  | $ 52,029

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