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Business Acquisitions and Divestiture - WIL Research Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 04, 2016 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016 | Feb. 11, 2017 | Feb. 10, 2017 | Mar. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  |  | $ 1,650,000,000.00
WIL Research |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price | $ 604,800,000 |  |  |  |  |  |  |
Assumed liabilities | 400,000 |  |  |  |  |  |  |
Purchase price allocation | 577,391,000 |  |  |  |  |  |  |
Cash acquired | $ 27,400,000 |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  | $ 14,800,000 | $ 19,000,000 |
Integration related costs and transaction costs |  | $ 400,000 | $ 1,300,000 | $ 1,600,000 | $ 13,700,000 |  |  |
Revenue |  |  | 57,400,000 |  | 112,600,000 |  |  |
Operating income |  |  | $ 3,600,000 |  | 4,600,000 |  |  |
Amortization of intangible assets and depreciation of fixed assets |  |  |  |  | 1,400,000 |  |  |
Reversal of interest expense on borrowings |  |  |  |  | $ 2,700,000 |  |  |

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