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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 790,990	$ 743,300	$ 682,584	$ 707,059	$ 691,138	$ 667,951	$ 657,568	$ 604,569	$ 2,923,933	$ 2,621,226	$ 2,266,096
RMS
Disaggregation of Revenue [Line Items]
Revenue									571,152	537,089	519,682
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									240,480	227,872	202,872
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									330,672	309,217	316,810
DSA
Disaggregation of Revenue [Line Items]
Revenue									1,837,428	1,618,995	1,316,854
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									1,836,519	1,618,281	1,316,005
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									909	714	849
Manufacturing
Disaggregation of Revenue [Line Items]
Revenue									515,353	465,142	429,560
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									174,254	142,896	128,287
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									$ 341,099	$ 322,246	$ 301,273

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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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