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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting Information [Line Items]
Revenue	$ 667,951	$ 585,295	$ 1,930,088	$ 1,664,566
Operating income	92,802	84,362	242,362	228,901
Depreciation and amortization	51,758	43,592	146,262	120,198
Capital expenditures	35,163	22,439	76,675	71,378
RMS
Segment Reporting Information [Line Items]
Revenue	132,546	126,811	405,772	391,195
Operating income	34,385	32,121	103,729	104,893
Depreciation and amortization	4,895	4,811	14,198	14,565
Capital expenditures	5,818	8,166	14,979	18,105
DSA
Segment Reporting Information [Line Items]
Revenue	420,079	352,257	1,179,793	958,665
Operating income	64,995	62,909	175,214	160,391
Depreciation and amortization	39,898	31,433	111,231	83,262
Capital expenditures	21,141	10,800	45,130	34,496
Manufacturing
Segment Reporting Information [Line Items]
Revenue	115,326	106,227	344,523	314,706
Operating income	39,253	33,266	103,893	95,904
Depreciation and amortization	5,990	5,709	17,577	17,313
Capital expenditures	$ 6,421	$ 2,709	$ 14,299	$ 12,731

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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