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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. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 657,568	$ 585,301	$ 1,262,137	$ 1,079,271
RMS
Disaggregation of Revenue [Line Items]
Total revenue	136,054	130,426	273,226	264,384
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	57,321	48,804	112,134	97,530
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	78,733	81,622	161,092	166,854
DSA
Disaggregation of Revenue [Line Items]
Total revenue	405,517	346,416	759,714	606,408
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	405,351	346,226	759,429	605,970
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	166	190	285	438
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	115,997	108,459	229,197	208,479
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	34,470	32,987	66,366	61,558
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 81,527	$ 75,472	$ 162,831	$ 146,921

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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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