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INCOME TAXES - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Deferred Tax Asset, Valuation Allowance [Roll Forward]
Beginning balance	$ 304,248	$ 294,753	$ 315,645
Additions (reductions) charged to income tax provision, net	965	963	1,929
Reductions due to divestitures, restructuring	(1,877)	0	(5,337)
Currency translation and other	(16,565)	8,532	(17,484)
Ending balance	$ 286,771	$ 304,248	$ 294,753

X

- Definition

Deferred Tax Asset, Valuation Allowance, Additions (Deductions) for Income Tax Expense (Benefit)

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance, Additions (Reductions) For Currency Translation and Other

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance, Reductions For Disposals, Restructuring

+ References

No definition available.

+ Details

Name:	crl_DeferredTaxAssetValuationAllowanceReductionsForDisposalsRestructuring
Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred Tax Asset, Valuation Allowance

+ References

No definition available.

+ Details

Name:	crl_DeferredTaxAssetValuationAllowanceRollForward
Namespace Prefix:	crl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Balance Type:	credit
Period Type:	instant