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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 667,951	$ 585,295	$ 1,930,088	$ 1,664,566
RMS
Disaggregation of Revenue [Line Items]
Total revenue	132,546	126,811	405,772	391,195
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	56,243	49,417	168,377	146,947
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	76,303	77,394	237,395	244,248
DSA
Disaggregation of Revenue [Line Items]
Total revenue	420,079	352,257	1,179,793	958,665
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	419,445	352,203	1,178,874	958,174
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	634	54	919	491
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	115,326	106,227	344,523	314,706
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	36,308	31,420	102,674	92,978
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 79,018	$ 74,807	$ 241,849	$ 221,728

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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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