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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. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Revenue	$ 682,584	$ 657,568	$ 1,389,643	$ 1,262,137
Operating income	76,768	79,768	171,049	149,560
Depreciation and amortization	57,208	49,146	114,468	94,504
Capital expenditures	26,800	24,781	52,521	41,512
RMS
Segment Reporting Information [Line Items]
Revenue	116,549	136,054	262,545	273,226
Operating income	3,844	31,512	31,217	69,344
Depreciation and amortization	9,126	4,981	17,878	9,303
Capital expenditures	6,621	5,049	12,033	9,161
DSA
Segment Reporting Information [Line Items]
Revenue	442,564	405,517	881,247	759,714
Operating income	72,241	63,514	144,524	110,219
Depreciation and amortization	41,101	37,549	82,431	71,333
Capital expenditures	16,175	15,141	30,904	23,989
Manufacturing
Segment Reporting Information [Line Items]
Revenue	123,471	115,997	245,851	229,197
Operating income	42,930	33,141	84,042	64,640
Depreciation and amortization	6,236	5,782	12,602	11,587
Capital expenditures	$ 3,037	$ 4,272	$ 8,198	$ 7,878

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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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