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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 913,929	$ 824,566
RMS
Disaggregation of Revenue [Line Items]
Total revenue	176,542	176,910
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	69,924	64,896
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	106,618	112,014
DSA
Disaggregation of Revenue [Line Items]
Total revenue	544,259	501,178
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	542,336	500,468
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,923	710
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	193,128	146,478
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	95,009	50,568
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 98,119	$ 95,910

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