v3.26.1

REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Dec. 27, 2025	Dec. 28, 2024
Disaggregation of Revenue [Line Items]
Percentage of unbilled revenue billed during period	75.00%	70.00%
Unbilled revenue	$ 195,622		$ 200,591	$ 212,000
Percentage of contract liabilities recognized as revenue during period	55.00%	60.00%
Contract liabilities			256,000	$ 283,000
Unpaid advanced client billings	$ 44,000		$ 43,000
Net provision (recovery) expense	(500)	$ 1,500
Performance obligations expected to be satisfied	702,200
Sales-type lease, revenue	$ 12,200	$ 11,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-03-29
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	50.00%
Performance obligations expected to be satisfied, expected timing	12 months

Accounts Receivable, Credit Loss Expense (Reversal), Net Of Recovery

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Contract With Customer, Asset, Percentage Of Amount Reclassified To Receivable

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Contract With Customer, Percentage Of Liabilities, Recognized As Revenue

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Contract With Customer, Unpaid Advanced Client Billings

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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CHARLES RIVER LABORATORIES INTERNATIONAL, INC. 10-Q