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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 585,295 | $ 464,232 | $ 1,664,566 | $ 1,379,124
Operating income | 84,362 | 74,062 | 228,901 | 225,454
Depreciation and amortization | 43,592 | 33,465 | 120,198 | 97,675
Capital expenditures | 22,439 | 22,011 | 71,378 | 53,928
RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 126,811 | 122,020 | 391,195 | 373,183
Operating income | 32,121 | 30,665 | 104,893 | 101,949
Depreciation and amortization | 4,811 | 5,272 | 14,565 | 15,309
Capital expenditures | 8,166 | 6,762 | 18,105 | 13,769
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 352,257 | 246,946 | 958,665 | 726,796
Operating income | 62,909 | 46,324 | 160,391 | 135,994
Depreciation and amortization | 31,433 | 20,333 | 83,262 | 58,667
Capital expenditures | 10,800 | 10,127 | 34,496 | 25,552
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 106,227 | 95,266 | 314,706 | 279,145
Operating income | 33,266 | 31,920 | 95,904 | 87,563
Depreciation and amortization | 5,709 | 5,572 | 17,313 | 17,321
Capital expenditures | $ 2,709 | $ 2,879 | $ 12,731 | $ 7,111

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