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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		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,009,763	$ 1,026,623	$ 3,047,440	$ 3,115,933
RMS
Disaggregation of Revenue [Line Items]
Total revenue	197,824	186,848	625,120	596,562
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	93,446	94,883	285,794	282,980
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	104,378	91,965	339,326	313,582
DSA
Disaggregation of Revenue [Line Items]
Total revenue	615,060	664,028	1,847,931	1,989,838
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	613,388	663,128	1,844,298	1,987,617
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,672	900	3,633	2,221
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	196,879	175,747	574,389	529,533
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	107,284	94,446	311,823	280,992
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 89,595	$ 81,301	$ 262,566	$ 248,541

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