SEGMENT AND GEOGRAPHIC INFORMATION - Schedule of Revenue and Other Financial Information by Reportable Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2024 USD ($)	Jul. 01, 2023 USD ($)	Jun. 29, 2024 USD ($) segment	Jul. 01, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Reporting Information [Line Items]
Revenue	$ 1,026,117	$ 1,059,937	$ 2,037,677	$ 2,089,310
Cost of revenue (excluding amortization of intangible assets)	672,404	660,960	1,339,121	1,312,679
Selling, general and administrative	169,791	199,758	356,082	374,604
Amortization of intangible assets	32,270	34,274	64,845	69,190
Operating income	151,652	164,945	277,629	332,837
Capital Expenditures	39,486	67,383	118,630	174,258
Depreciation and amortization	86,082	77,671	171,439	154,740
Unallocated corporate
Segment Reporting Information [Line Items]
Selling, general and administrative	53,902	69,914	119,594	115,968
Operating income	(53,902)	(69,914)	(119,594)	(115,968)
Capital Expenditures	146	702	1,425	1,571
Depreciation and amortization	1,742	1,075	3,382	2,121
RMS
Segment Reporting Information [Line Items]
Revenue	206,389	209,948	427,296	409,714
RMS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	206,389	209,948	427,296	409,714
Cost of revenue (excluding amortization of intangible assets)	142,942	127,888	283,867	254,692
Selling, general and administrative	27,597	27,653	58,490	54,711
Amortization of intangible assets	5,902	5,489	11,842	10,984
Operating income	29,948	48,918	73,097	89,327
Capital Expenditures	9,313	7,493	29,357	26,577
Depreciation and amortization	16,538	13,949	34,661	27,438
DSA
Segment Reporting Information [Line Items]
Revenue	627,419	663,457	1,232,871	1,325,810
DSA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	627,419	663,457	1,232,871	1,325,810
Cost of revenue (excluding amortization of intangible assets)	418,964	420,551	836,876	832,074
Selling, general and administrative	54,479	63,709	111,338	125,707
Amortization of intangible assets	15,600	17,659	31,442	35,060
Operating income	138,376	161,538	253,215	332,969
Capital Expenditures	19,444	48,326	68,403	113,510
Depreciation and amortization	47,729	43,124	93,518	85,574
Manufacturing
Segment Reporting Information [Line Items]
Revenue	192,309	186,532	377,510	353,786
Manufacturing | Operating Segments
Segment Reporting Information [Line Items]
Revenue	192,309	186,532	377,510	353,786
Cost of revenue (excluding amortization of intangible assets)	110,498	112,522	218,378	225,914
Selling, general and administrative	33,813	38,481	66,660	78,218
Amortization of intangible assets	10,768	11,126	21,561	23,145
Operating income	37,230	24,403	70,911	26,509
Capital Expenditures	10,583	10,862	19,445	32,600
Depreciation and amortization	$ 20,073	$ 19,523	$ 39,878	$ 39,607