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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. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Revenue	$ 743,300	$ 667,951	$ 2,132,943	$ 1,930,088
Operating income	132,753	92,802	303,802	242,362
Depreciation and amortization	59,580	51,758	174,048	146,262
Capital expenditures	26,185	35,163	78,706	76,675
RMS
Segment Reporting Information [Line Items]
Revenue	151,910	132,546	414,455	405,772
Operating income	37,108	34,385	68,325	103,729
Depreciation and amortization	9,455	4,895	27,333	14,198
Capital expenditures	3,552	5,818	15,585	14,979
DSA
Segment Reporting Information [Line Items]
Revenue	461,177	420,079	1,342,424	1,179,793
Operating income	90,348	64,995	234,872	175,214
Depreciation and amortization	42,707	39,898	125,138	111,231
Capital expenditures	15,532	21,141	46,436	45,130
Manufacturing
Segment Reporting Information [Line Items]
Revenue	130,213	115,326	376,064	344,523
Operating income	48,246	39,253	132,288	103,893
Depreciation and amortization	6,655	5,990	19,257	17,577
Capital expenditures	$ 5,787	$ 6,421	$ 13,985	$ 14,299

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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.

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