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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021
Segment Reporting Information [Line Items]
Revenue	$ 913,929	$ 824,566
Operating income	148,778	123,703
Depreciation and amortization	75,299	61,508
Capital expenditures	80,464	28,030
RMS
Segment Reporting Information [Line Items]
Revenue	176,542	176,910
Operating income	47,882	44,935
Depreciation and amortization	9,469	9,679
Capital expenditures	8,646	2,983
DSA
Segment Reporting Information [Line Items]
Revenue	544,259	501,178
Operating income	104,986	90,949
Depreciation and amortization	46,789	44,608
Capital expenditures	48,930	17,040
Manufacturing
Segment Reporting Information [Line Items]
Revenue	193,128	146,478
Operating income	46,368	49,437
Depreciation and amortization	18,482	6,569
Capital expenditures	$ 22,828	$ 7,110

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