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BUSINESS ACQUISITIONS - WIL Research, Allocation of Purchase Price (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Apr. 04, 2016 | Dec. 26, 2015 | Dec. 27, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 787,517 |  | $ 438,829 | $ 321,077
WIL Research |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired receivables, contractual amount |  | $ 48,625 |  |
Trade receivables |  | 48,157 |  |
Inventories |  | 2,296 |  |
Other current assets (excluding cash) |  | 3,814 |  |
Property, plant and equipment |  | 129,066 |  |
Other long-term assets |  | 1,060 |  |
Definite-lived intangible assets |  | 164,800 |  |
Goodwill |  | 330,602 |  |
Deferred revenue |  | (39,103) |  |
Current liabilities |  | (27,386) |  |
Long-term liabilities |  | (35,915) |  |
Total purchase price allocation |  | $ 577,391 |  |

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