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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 604,569	$ 493,970
Operating income	69,792	67,829
Depreciation and amortization	45,358	33,210
Capital expenditures	16,731	27,726
RMS
Segment Reporting Information [Line Items]
Total revenue	137,172	133,958
Operating income	37,832	38,527
Depreciation and amortization	4,322	4,853
Capital expenditures	4,112	4,625
DSA
Segment Reporting Information [Line Items]
Total revenue	354,197	259,992
Operating income	46,705	40,859
Depreciation and amortization	33,784	20,787
Capital expenditures	8,848	12,802
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	113,200	100,020
Operating income	31,499	28,523
Depreciation and amortization	5,805	5,736
Capital expenditures	$ 3,606	$ 6,834

X

- 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
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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- Definition

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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