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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 27, 2021 | Mar. 28, 2020
Segment Reporting Information [Line Items] |  |
Revenue | $ 824,566 | $ 707,059
Operating income | 123,703 | 94,281
Depreciation and amortization | 61,508 | 57,260
Capital expenditures | 28,030 | 25,721
RMS |  |
Segment Reporting Information [Line Items] |  |
Revenue | 176,910 | 145,996
Operating income | 44,935 | 27,373
Depreciation and amortization | 9,679 | 8,752
Capital expenditures | 2,983 | 5,412
DSA |  |
Segment Reporting Information [Line Items] |  |
Revenue | 501,178 | 438,683
Operating income | 90,949 | 72,283
Depreciation and amortization | 44,608 | 41,330
Capital expenditures | 17,040 | 14,729
Manufacturing |  |
Segment Reporting Information [Line Items] |  |
Revenue | 146,478 | 122,380
Operating income | 49,437 | 41,112
Depreciation and amortization | 6,569 | 6,366
Capital expenditures | $ 7,110 | $ 5,161

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