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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Segment Reporting Information [Line Items]        
Revenue $ 1,059,937 $ 973,131 $ 2,089,310 $ 1,887,060
Operating income 164,945 187,411 332,837 336,189
Depreciation and amortization 77,671 76,421 154,740 151,720
Capital expenditures 67,383 82,852 174,258 163,316
Unallocated Corporate        
Segment Reporting Information [Line Items]        
Operating income (69,914) (43,411) (115,968) (93,869)
Depreciation and amortization 1,075 567 2,121 1,126
Capital expenditures 702 2,993 1,571 3,053
RMS        
Segment Reporting Information [Line Items]        
Revenue 209,948 186,410 409,714 362,952
RMS | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 209,948 186,410 409,714 362,952
Operating income 48,918 39,526 89,327 87,408
Depreciation and amortization 13,949 13,228 27,438 22,697
Capital expenditures 7,493 13,850 26,577 22,496
DSA        
Segment Reporting Information [Line Items]        
Revenue 663,457 591,917 1,325,810 1,136,176
DSA | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 663,457 591,917 1,325,810 1,136,176
Operating income 161,538 128,793 332,969 233,779
Depreciation and amortization 43,124 44,626 85,574 91,415
Capital expenditures 48,326 41,578 113,510 90,508
Manufacturing        
Segment Reporting Information [Line Items]        
Revenue 186,532 194,804 353,786 387,932
Manufacturing | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 186,532 194,804 353,786 387,932
Operating income 24,403 62,503 26,509 108,871
Depreciation and amortization 19,523 18,000 39,607 36,482
Capital expenditures $ 10,862 $ 24,431 $ 32,600 $ 47,259