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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. 25, 2021 | Sep. 26, 2020 | Sep. 25, 2021 | Sep. 26, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 895,937 | $ 743,300 | $ 2,635,110 | $ 2,132,943
Operating income | 155,802 | 132,753 | 417,055 | 303,802
Depreciation and amortization | 68,686 | 59,580 | 198,299 | 174,048
Capital expenditures | 55,536 | 26,185 | 129,997 | 78,706
RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 171,258 | 151,910 | 524,862 | 414,455
Operating income | 39,111 | 37,108 | 126,626 | 68,325
Depreciation and amortization | 9,927 | 9,455 | 29,450 | 27,333
Capital expenditures | 18,026 | 3,552 | 29,521 | 15,585
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 531,823 | 461,177 | 1,573,095 | 1,342,424
Operating income | 116,548 | 90,348 | 312,011 | 234,872
Depreciation and amortization | 44,072 | 42,707 | 132,268 | 125,138
Capital expenditures | 23,270 | 15,532 | 60,783 | 46,436
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 192,856 | 130,213 | 537,153 | 376,064
Operating income | 48,563 | 48,246 | 154,717 | 132,288
Depreciation and amortization | 13,953 | 6,655 | 34,474 | 19,257
Capital expenditures | $ 13,296 | $ 5,787 | $ 34,008 | $ 13,985

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