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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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