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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. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 601,530	$ 585,295	$ 585,301	$ 493,970	$ 478,477	$ 464,232	$ 469,129	$ 445,763	$ 2,266,096	$ 1,857,601	$ 1,681,432
RMS
Disaggregation of Revenue [Line Items]
Revenue									519,682	493,615	494,037
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									202,872
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									316,810
DSA
Disaggregation of Revenue [Line Items]
Revenue									1,316,854	980,022	836,593
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									1,316,005
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									849
Manufacturing
Disaggregation of Revenue [Line Items]
Revenue									429,560	$ 383,964	$ 350,802
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue									128,287
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue									$ 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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