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SEGMENT AND GEOGRAPHIC INFORMATION - Financial Information by Reportable Business Segment (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Dec. 29, 2018 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 28, 2019 USD ($) segments | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segments |  |  |  |  |  |  |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 691,138 | $ 667,951 | $ 657,568 | $ 604,569 | $ 601,530 | $ 585,295 | $ 585,301 | $ 493,970 | $ 2,621,226 | $ 2,266,096 | $ 1,857,601
Operating income | $ 108,789 | $ 92,802 | $ 79,768 | $ 69,792 | $ 102,482 | $ 84,362 | $ 76,710 | $ 67,829 | 351,151 | 331,383 | 288,282
Depreciation and amortization |  |  |  |  |  |  |  |  | 198,095 | 161,779 | 131,159
Capital expenditures |  |  |  |  |  |  |  |  | 140,514 | 140,054 | 82,431
RMS |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 537,089 | 519,682 | 493,615
Operating income |  |  |  |  |  |  |  |  | 133,912 | 136,468 | 114,588
Depreciation and amortization |  |  |  |  |  |  |  |  | 19,197 | 19,469 | 19,627
Capital expenditures |  |  |  |  |  |  |  |  | 26,989 | 35,172 | 20,879
DSA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,618,995 | 1,316,854 | 980,022
Operating income |  |  |  |  |  |  |  |  | 258,903 | 227,577 | 182,796
Depreciation and amortization |  |  |  |  |  |  |  |  | 151,139 | 112,976 | 79,355
Capital expenditures |  |  |  |  |  |  |  |  | 86,843 | 73,425 | 36,616
Manufacturing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 465,142 | 429,560 | 383,964
Operating income |  |  |  |  |  |  |  |  | 145,420 | 136,212 | 123,898
Depreciation and amortization |  |  |  |  |  |  |  |  | 23,584 | 22,529 | 22,893
Capital expenditures |  |  |  |  |  |  |  |  | $ 23,617 | $ 23,323 | $ 15,188

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