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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. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,004,852	$ 1,009,763	$ 3,021,155	$ 3,047,440
RMS
Disaggregation of Revenue [Line Items]
Total revenue	213,474	197,824	639,818	625,120
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	96,080	93,446	290,832	285,794
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	117,394	104,378	348,986	339,326
DSA
Disaggregation of Revenue [Line Items]
Total revenue	600,685	615,060	1,811,323	1,847,931
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	600,080	613,388	1,809,465	1,844,298
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	605	1,672	1,858	3,633
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	190,693	196,879	570,014	574,389
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	92,250	107,284	290,334	311,823
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 98,443	$ 89,595	$ 279,680	$ 262,566

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