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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 657,568 | $ 585,301 | $ 1,262,137 | $ 1,079,271
Operating income | 79,768 | 76,710 | 149,560 | 144,539
Depreciation and amortization | 49,146 | 43,396 | 94,504 | 76,606
Capital expenditures | 24,781 | 21,213 | 41,512 | 48,939
RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 136,054 | 130,426 | 273,226 | 264,384
Operating income | 31,512 | 34,245 | 69,344 | 72,772
Depreciation and amortization | 4,981 | 4,901 | 9,303 | 9,754
Capital expenditures | 5,049 | 5,314 | 9,161 | 9,939
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 405,517 | 346,416 | 759,714 | 606,408
Operating income | 63,514 | 56,623 | 110,219 | 97,482
Depreciation and amortization | 37,549 | 31,042 | 71,333 | 51,829
Capital expenditures | 15,141 | 10,894 | 23,989 | 23,696
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 115,997 | 108,459 | 229,197 | 208,479
Operating income | 33,141 | 34,115 | 64,640 | 62,638
Depreciation and amortization | 5,782 | 5,868 | 11,587 | 11,604
Capital expenditures | $ 4,272 | $ 3,188 | $ 7,878 | $ 10,022

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