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BUSINESS ACQUISITIONS - WIL Research, Additional Information (Details) - WIL Research - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 04, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 26, 2015
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 604,800 |  |  |
Assumed liabilities | 400 |  |  |
Purchase price allocation | 577,391 |  |  |
Cash acquired | 27,400 |  |  |
Goodwill resulting from transaction | $ 19,000 |  |  |
Transaction and integration costs |  |  | $ 15,500 | $ 3,200
Revenue |  | $ 176,100 |  |
Operating income (loss) |  | $ 12,500 |  |
Additional amortization of intangible assets and depreciation of fixed assets |  |  | 400 | 13,600
Reversal of interest expense on borrowings |  |  | $ 2,600 | 10,500
Acquisition-related transaction costs |  |  |  | $ 11,500

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