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BUSINESS ACQUISITIONS AND DIVESTITURE - MPI Research Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 03, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jul. 01, 2017 | Mar. 26, 2018
Credit facility | $2.3 Billion Credit Facility |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Credit facility |  |  |  |  | $ 2,300,000,000.0
MPI Research |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 829,700,000 |  |  |  |
Purchase price allocation | 800,239,000 |  |  |  |
Cash acquired | 27,700,000 |  |  |  |
Adjustments related to prior period | 1,700,000 |  |  |  |
Goodwill, amount expected to be deductible for tax purposes | $ 4,100,000 |  |  |  |
Integration related costs and transaction costs |  | $ 11,700,000 | $ 14,500,000 |  |
Pro forma revenue since acquisition date |  | 66,600,000 |  |  |
Pro forma operating income since acquisition date |  | $ 8,200,000 |  |  |
Depreciation and Amortization Expense | MPI Research |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Adjustments related to prior period |  |  | 9,400,000 | $ 11,400,000 |
Interest Expense | MPI Research |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Adjustments related to prior period |  |  | $ 2,800,000 | $ 13,500,000 |

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