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SEGMENT AND GEOGRAPHIC INFORMATION - Financial Information by Reportable Business Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 25, 2021 USD ($)	Dec. 26, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Revenue	$ 3,976,060	$ 3,540,160	$ 2,923,933
Operating income	650,975	589,862	432,729
Depreciation and amortization	303,870	265,540	234,924
Capital expenditures	324,733	228,772	166,560
Unallocated corporate
Segment Reporting Information [Line Items]
Operating income	(209,408)	(230,320)	(177,430)
Depreciation and amortization	2,181	2,968	3,018
Capital expenditures	3,950	7,230	5,133
RMS
Segment Reporting Information [Line Items]
Revenue	739,175	690,437	571,152
RMS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	739,175	690,437	571,152
Operating income	160,410	166,814	102,706
Depreciation and amortization	49,274	39,123	37,080
Capital expenditures	44,136	61,188	29,487
DSA
Segment Reporting Information [Line Items]
Revenue	2,447,316	2,107,231	1,837,428
DSA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	2,447,316	2,107,231	1,837,428
Operating income	532,889	406,978	325,959
Depreciation and amortization	179,465	177,254	168,922
Capital expenditures	189,563	101,477	105,653
Manufacturing
Segment Reporting Information [Line Items]
Revenue	789,569	742,492	515,353
Manufacturing | Operating Segments
Segment Reporting Information [Line Items]
Revenue	789,569	742,492	515,353
Operating income	167,084	246,390	181,494
Depreciation and amortization	72,950	46,195	25,904
Capital expenditures	$ 87,084	$ 58,877	$ 26,287

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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