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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 682,584	$ 657,568	$ 1,389,643	$ 1,262,137
RMS
Disaggregation of Revenue [Line Items]
Total revenue	116,549	136,054	262,545	273,226
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	57,357	57,321	117,398	112,134
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	59,192	78,733	145,147	161,092
DSA
Disaggregation of Revenue [Line Items]
Total revenue	442,564	405,517	881,247	759,714
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	442,447	405,351	881,011	759,429
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	117	166	236	285
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	123,471	115,997	245,851	229,197
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	41,317	34,470	78,631	66,366
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 82,154	$ 81,527	$ 167,220	$ 162,831

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