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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. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 989,157	$ 895,937	$ 2,876,217	$ 2,635,110
RMS
Disaggregation of Revenue [Line Items]
Total revenue	180,114	171,258	543,066	524,862
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	88,174	65,805	243,901	197,035
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	91,940	105,453	299,165	327,827
DSA
Disaggregation of Revenue [Line Items]
Total revenue	619,463	531,823	1,755,639	1,573,095
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	618,270	531,637	1,749,977	1,571,895
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,193	186	5,662	1,200
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	189,580	192,856	577,512	537,153
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	89,173	93,473	276,993	240,015
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 100,407	$ 99,383	$ 300,519	$ 297,138

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