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SEGMENT AND GEOGRAPHIC INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2024 USD ($) segment	Apr. 01, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Revenue	$ 1,011,560	$ 1,029,373
Cost of revenue (excluding amortization of intangible assets)	666,717	651,719
Selling, general and administrative	186,291	174,846
Amortization of intangible assets	32,575	34,916
Operating income	125,977	167,892
Capital Expenditures	79,144	106,875
Depreciation and amortization	85,357	77,069
Unallocated corporate
Segment Reporting Information [Line Items]
Selling, general and administrative	65,692	46,054
Operating income	(65,692)	(46,054)
Capital Expenditures	1,279	869
Depreciation and amortization	1,640	1,046
RMS
Segment Reporting Information [Line Items]
Revenue	220,907	199,766
RMS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	220,907	199,766
Cost of revenue (excluding amortization of intangible assets)	140,925	126,804
Selling, general and administrative	30,893	27,058
Amortization of intangible assets	5,940	5,495
Operating income	43,149	40,409
Capital Expenditures	20,044	19,084
Depreciation and amortization	18,123	13,489
DSA
Segment Reporting Information [Line Items]
Revenue	605,452	662,353
DSA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	605,452	662,353
Cost of revenue (excluding amortization of intangible assets)	417,912	411,523
Selling, general and administrative	56,859	61,998
Amortization of intangible assets	15,842	17,401
Operating income	114,839	171,431
Capital Expenditures	48,959	65,184
Depreciation and amortization	45,789	42,450
Manufacturing
Segment Reporting Information [Line Items]
Revenue	185,201	167,254
Manufacturing | Operating Segments
Segment Reporting Information [Line Items]
Revenue	185,201	167,254
Cost of revenue (excluding amortization of intangible assets)	107,880	113,392
Selling, general and administrative	32,847	39,736
Amortization of intangible assets	10,793	12,020
Operating income	33,681	2,106
Capital Expenditures	8,862	21,738
Depreciation and amortization	$ 19,805	$ 20,084

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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