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BUSINESS ACQUISITIONS - Pro Forma Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Citoxlab |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 673,645 | $ 630,411 | $ 1,325,483 | $ 1,168,651
Net income attributable to common shareholders | $ 53,625 | 54,990 | $ 114,653 | 107,859
MPI Research |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 585,297 |  | 1,141,388
Net income attributable to common shareholders |  | $ 60,161 |  | $ 109,575

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