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SEGMENT AND GEOGRAPHIC INFORMATION - Financial Information by Reportable Business Segment (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 25, 2021 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable segments | segment | 3 |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 4,129,409 | $ 3,976,060 | $ 3,540,160
Operating income | 617,261 | 650,975 | 589,862
Depreciation and amortization | 314,124 | 303,870 | 265,540
Capital expenditures | 318,528 | 324,733 | 228,772
Unallocated corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | (231,810) | (209,408) | (230,320)
Depreciation and amortization | 3,853 | 2,181 | 2,968
Capital expenditures | 2,684 | 3,950 | 7,230
RMS |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 792,343 | 739,175 | 690,437
RMS | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 792,343 | 739,175 | 690,437
Operating income | 154,666 | 160,410 | 166,814
Depreciation and amortization | 55,570 | 49,274 | 39,123
Capital expenditures | 52,819 | 44,136 | 61,188
DSA |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 2,615,623 | 2,447,316 | 2,107,231
DSA | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 2,615,623 | 2,447,316 | 2,107,231
Operating income | 606,076 | 532,889 | 406,978
Depreciation and amortization | 174,719 | 179,465 | 177,254
Capital expenditures | 204,891 | 189,563 | 101,477
Manufacturing |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 721,443 | 789,569 | 742,492
Manufacturing | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 721,443 | 789,569 | 742,492
Operating income | 88,329 | 167,084 | 246,390
Depreciation and amortization | 79,982 | 72,950 | 46,195
Capital expenditures | $ 58,134 | $ 87,084 | $ 58,877

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