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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. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Segment Reporting Information [Line Items]
Revenue	$ 895,937	$ 743,300	$ 2,635,110	$ 2,132,943
Operating income	155,802	132,753	417,055	303,802
Depreciation and amortization	68,686	59,580	198,299	174,048
Capital expenditures	55,536	26,185	129,997	78,706
RMS
Segment Reporting Information [Line Items]
Revenue	171,258	151,910	524,862	414,455
Operating income	39,111	37,108	126,626	68,325
Depreciation and amortization	9,927	9,455	29,450	27,333
Capital expenditures	18,026	3,552	29,521	15,585
DSA
Segment Reporting Information [Line Items]
Revenue	531,823	461,177	1,573,095	1,342,424
Operating income	116,548	90,348	312,011	234,872
Depreciation and amortization	44,072	42,707	132,268	125,138
Capital expenditures	23,270	15,532	60,783	46,436
Manufacturing
Segment Reporting Information [Line Items]
Revenue	192,856	130,213	537,153	376,064
Operating income	48,563	48,246	154,717	132,288
Depreciation and amortization	13,953	6,655	34,474	19,257
Capital expenditures	$ 13,296	$ 5,787	$ 34,008	$ 13,985

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