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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,029,373	$ 913,929
RMS
Disaggregation of Revenue [Line Items]
Total revenue	199,766	176,542
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	93,639	69,924
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	106,127	106,618
DSA
Disaggregation of Revenue [Line Items]
Total revenue	662,353	544,259
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	661,836	542,336
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	517	1,923
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	167,254	193,128
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	86,086	95,009
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 81,168	$ 98,119

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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