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INVENTORY - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Inventory Disclosure [Abstract]
Amortization of inventory step up	$ 6.2	$ 5.8

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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