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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Segment Reporting Information [Line Items]
Revenue	$ 1,029,373	$ 913,929
Operating income	167,892	148,778
Depreciation and amortization	77,069	75,299
Capital expenditures	106,875	80,464
Unallocated corporate
Segment Reporting Information [Line Items]
Operating income	(46,054)	(50,458)
Depreciation and amortization	1,046	559
Capital expenditures	869	60
RMS
Segment Reporting Information [Line Items]
Revenue	199,766	176,542
RMS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	199,766	176,542
Operating income	40,409	47,882
Depreciation and amortization	13,489	9,469
Capital expenditures	19,084	8,646
DSA
Segment Reporting Information [Line Items]
Revenue	662,353	544,259
DSA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	662,353	544,259
Operating income	171,431	104,986
Depreciation and amortization	42,450	46,789
Capital expenditures	65,184	48,930
Manufacturing
Segment Reporting Information [Line Items]
Revenue	167,254	193,128
Manufacturing | Operating Segments
Segment Reporting Information [Line Items]
Revenue	167,254	193,128
Operating income	2,106	46,368
Depreciation and amortization	20,084	18,482
Capital expenditures	$ 21,738	$ 22,828

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