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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 707,059	$ 604,569
RMS
Disaggregation of Revenue [Line Items]
Total revenue	145,996	137,172
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	60,041	54,813
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	85,955	82,359
DSA
Disaggregation of Revenue [Line Items]
Total revenue	438,683	354,197
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	438,564	354,078
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	119	119
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	122,380	113,200
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	37,314	31,896
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 85,066	$ 81,304

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+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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