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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. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 914,607 | $ 682,584 | $ 1,739,173 | $ 1,389,643
Operating income | 137,550 | 76,768 | 261,253 | 171,049
Depreciation and amortization | 68,106 | 57,208 | 129,613 | 114,468
Capital expenditures | 46,431 | 26,800 | 74,461 | 52,521
RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 176,694 | 116,549 | 353,604 | 262,545
Operating income | 42,580 | 3,844 | 87,515 | 31,217
Depreciation and amortization | 9,844 | 9,126 | 19,523 | 17,878
Capital expenditures | 8,512 | 6,621 | 11,495 | 12,033
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 540,094 | 442,564 | 1,041,272 | 881,247
Operating income | 104,514 | 72,241 | 195,463 | 144,524
Depreciation and amortization | 43,588 | 41,101 | 88,196 | 82,431
Capital expenditures | 20,473 | 16,175 | 37,513 | 30,904
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 197,819 | 123,471 | 344,297 | 245,851
Operating income | 56,717 | 42,930 | 106,154 | 84,042
Depreciation and amortization | 13,952 | 6,236 | 20,521 | 12,602
Capital expenditures | $ 13,602 | $ 3,037 | $ 20,712 | $ 8,198

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