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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 984,168	$ 1,011,560
RMS
Disaggregation of Revenue [Line Items]
Total revenue	213,073	220,907
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	97,004	97,049
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	116,069	123,858
DSA
Disaggregation of Revenue [Line Items]
Total revenue	592,609	605,452
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	591,520	604,125
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,089	1,327
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	178,486	185,201
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	91,467	100,058
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 87,019	$ 85,143

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