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INVENTORY - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2024 | Sep. 28, 2024
Inventory Disclosure [Abstract] |  |
Amortization of inventory step up | $ 5.9 | $ 16.5

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- Definition Amortization Of Inventory Step Up + References No definition available. + Details
Name: | crl_AmortizationOfInventoryStepUp
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration