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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,026,623	$ 989,157	$ 3,115,933	$ 2,876,217
RMS
Disaggregation of Revenue [Line Items]
Total revenue	186,848	180,114	596,562	543,066
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	94,883	88,174	282,980	243,901
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	91,965	91,940	313,582	299,165
DSA
Disaggregation of Revenue [Line Items]
Total revenue	664,028	619,463	1,989,838	1,755,639
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	663,128	618,270	1,987,617	1,749,977
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	900	1,193	2,221	5,662
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	175,747	189,580	529,533	577,512
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	94,446	89,173	280,992	276,993
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 81,301	$ 100,407	$ 248,541	$ 300,519

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