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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. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 585,295	$ 464,232	$ 1,664,566	$ 1,379,124
RMS
Disaggregation of Revenue [Line Items]
Total revenue	126,811	122,020	391,195	373,183
DSA
Disaggregation of Revenue [Line Items]
Total revenue	352,257	246,946	958,665	726,796
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	106,227	$ 95,266	314,706	$ 279,145
Services and products transferred over time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	49,417		146,947
Services and products transferred over time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	352,203		958,174
Services and products transferred over time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	31,420		92,978
Services and products transferred at a point in time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	77,394		244,248
Services and products transferred at a point in time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	54		491
Services and products transferred at a point in time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	$ 74,807		$ 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://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
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-Section 50
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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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