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SEGMENT AND GEOGRAPHIC INFORMATION - Financial Information by Reportable Business Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2020 USD ($)	Sep. 26, 2020 USD ($)	Jun. 27, 2020 USD ($)	Mar. 28, 2020 USD ($)	Dec. 28, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 26, 2020 USD ($) segment	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment									3
Segment Reporting Information [Line Items]
Revenue	$ 790,990	$ 743,300	$ 682,584	$ 707,059	$ 691,138	$ 667,951	$ 657,568	$ 604,569	$ 2,923,933	$ 2,621,226	$ 2,266,096
Operating income	$ 128,927	$ 132,753	$ 76,768	$ 94,281	$ 108,789	$ 92,802	$ 79,768	$ 69,792	432,729	351,151	331,383
Depreciation and amortization									234,924	198,095	161,779
Capital expenditures									166,560	140,514	140,054
RMS
Segment Reporting Information [Line Items]
Revenue									571,152	537,089	519,682
Operating income									102,706	133,912	136,468
Depreciation and amortization									37,080	19,197	19,469
Capital expenditures									29,487	26,989	35,172
DSA
Segment Reporting Information [Line Items]
Revenue									1,837,428	1,618,995	1,316,854
Operating income									325,959	258,903	227,577
Depreciation and amortization									168,922	151,139	112,976
Capital expenditures									105,653	86,843	73,425
Manufacturing
Segment Reporting Information [Line Items]
Revenue									515,353	465,142	429,560
Operating income									181,494	145,420	136,212
Depreciation and amortization									25,904	23,584	22,529
Capital expenditures									$ 26,287	$ 23,617	$ 23,323

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