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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Dec. 25, 2021
Revenue from Contract with Customer [Abstract]
Payment terms	30 days
Unpaid advanced client billings	$ 44,000		$ 36,000
Contract liabilities (customer contract deposits)	$ 63,985		$ 59,512
Percentage of unbilled revenue billed during period	60.00%	60.00%
Amount of unbilled revenue billed during period	$ 161,000	$ 135,000
Percentage of contract liabilities recognized as revenue during period	65.00%	60.00%
Amount of contract liabilities recognized as revenue	$ 240,000	$ 227,000
Lease revenue	$ 7,900

X

- Definition

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

+ References

No definition available.

+ Details

Name:	crl_ContractWithCustomerAssetPercentageOfAmountReclassifiedtoReceivable
Namespace Prefix:	crl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract With Customer Liability, Customer Deposits

+ References

No definition available.

+ Details

Name:	crl_ContractWithCustomerLiabilityCustomerDeposits
Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract With Customer, Percentage Of Liabilities, Recognized As Revenue

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract With Customer, Unpaid Advanced Client Billings

+ References

No definition available.

+ Details

Name:	crl_ContractWithCustomerUnpaidAdvancedClientBillings
Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract with Customer, Terms Of Payment

+ References

No definition available.

+ Details

Name:	crl_ContractwithCustomerTermsOfPayment
Namespace Prefix:	crl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of sales-type lease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration