REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,026,117	$ 1,059,937	$ 2,037,677	$ 2,089,310
RMS
Disaggregation of Revenue [Line Items]
Total revenue	206,389	209,948	427,296	409,714
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	95,299	94,458	192,348	188,097
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	111,090	115,490	234,948	221,617
DSA
Disaggregation of Revenue [Line Items]
Total revenue	627,419	663,457	1,232,871	1,325,810
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	626,785	662,653	1,230,910	1,324,489
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	634	804	1,961	1,321
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	192,309	186,532	377,510	353,786
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	104,481	100,460	204,539	186,546
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 87,828	$ 86,072	$ 172,971	$ 167,240