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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 657,568	$ 585,301	$ 1,262,137	$ 1,079,271
Operating income	79,768	76,710	149,560	144,539
Depreciation and amortization	49,146	43,396	94,504	76,606
Capital expenditures	24,781	21,213	41,512	48,939
RMS
Segment Reporting Information [Line Items]
Total revenue	136,054	130,426	273,226	264,384
Operating income	31,512	34,245	69,344	72,772
Depreciation and amortization	4,981	4,901	9,303	9,754
Capital expenditures	5,049	5,314	9,161	9,939
DSA
Segment Reporting Information [Line Items]
Total revenue	405,517	346,416	759,714	606,408
Operating income	63,514	56,623	110,219	97,482
Depreciation and amortization	37,549	31,042	71,333	51,829
Capital expenditures	15,141	10,894	23,989	23,696
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	115,997	108,459	229,197	208,479
Operating income	33,141	34,115	64,640	62,638
Depreciation and amortization	5,782	5,868	11,587	11,604
Capital expenditures	$ 4,272	$ 3,188	$ 7,878	$ 10,022

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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+ References

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