SEGMENT AND GEOGRAPHIC INFORMATION - Schedule of Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,004,852	$ 1,009,763	$ 3,021,155	$ 3,047,440
Selling, general and administrative	177,589	199,213	546,937	555,295
Amortization of intangible assets	27,404	32,403	158,052	97,248
Operating income (loss)	133,799	117,405	308,602	395,034
Interest income	1,422	1,528	3,923	6,740
Interest expense	(25,403)	(30,284)	(83,254)	(98,054)
Other income (expense), net	(22,618)	2,592	(34,675)	6,185
Income before income taxes	87,200	91,241	194,596	309,905
Capital Expenditures	35,580	38,721	130,202	157,351
Depreciation and amortization	85,164	88,198	325,035	259,637
RMS
Segment Reporting Information [Line Items]
Revenue	213,474	197,824	639,818	625,120
DSA
Segment Reporting Information [Line Items]
Revenue	600,685	615,060	1,811,323	1,847,931
Manufacturing
Segment Reporting Information [Line Items]
Revenue	190,693	196,879	570,014	574,389
Operating Segments \| RMS
Segment Reporting Information [Line Items]
Revenue	213,474	197,824	639,818	625,120
Cost of revenue (excluding amortization of intangible assets)	148,004	137,906	430,435	421,773
Selling, general and administrative	24,934	26,453	77,509	84,943
Amortization of intangible assets	5,983	5,921	17,930	17,763
Operating income (loss)	34,553	27,544	113,944	100,641
Capital Expenditures	3,173	7,186	14,099	36,543
Depreciation and amortization	21,939	18,389	63,410	53,050
Operating Segments \| DSA
Segment Reporting Information [Line Items]
Revenue	600,685	615,060	1,811,323	1,847,931
Cost of revenue (excluding amortization of intangible assets)	408,112	409,684	1,250,162	1,246,560
Selling, general and administrative	56,266	63,260	181,829	174,598
Amortization of intangible assets	13,154	15,680	39,446	47,122
Operating income (loss)	123,153	126,436	339,886	379,651
Capital Expenditures	25,709	22,773	78,730	91,176
Depreciation and amortization	44,001	47,751	128,660	141,269
Operating Segments \| Manufacturing
Segment Reporting Information [Line Items]
Revenue	190,693	196,879	570,014	574,389
Cost of revenue (excluding amortization of intangible assets)	109,944	113,152	326,967	331,530
Selling, general and administrative	32,556	32,737	99,004	99,397
Amortization of intangible assets	8,267	10,802	100,676	32,363
Operating income (loss)	39,926	40,188	43,367	111,099
Capital Expenditures	5,191	8,735	33,631	28,180
Depreciation and amortization	17,377	20,298	127,343	60,176
Operating Segments \| Segment operating income
Segment Reporting Information [Line Items]
Operating income (loss)	197,632	194,168	497,197	591,391
Unallocated corporate
Segment Reporting Information [Line Items]
Selling, general and administrative	63,833	76,763	188,595	196,357
Operating income (loss)	(63,833)	(76,763)	(188,595)	(196,357)
Capital Expenditures	1,507	27	3,742	1,452
Depreciation and amortization	$ 1,847	$ 1,760	$ 5,622	$ 5,142

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. 10-Q