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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Dec. 25, 2021
Revenue from Contract with Customer [Abstract]
Payment terms			30 days
Unpaid advanced client billings	$ 49,000		$ 49,000		$ 36,000
Contract liabilities (customer contract deposits)	77,038		$ 77,038		$ 59,512
Percentage of unbilled revenue billed during period			75.00%	80.00%
Amount of unbilled revenue billed during period			$ 161,000	$ 135,000
Percentage of contract liabilities recognized as revenue during period			75.00%	75.00%
Amount of contract liabilities recognized as revenue			$ 240,000	$ 227,000
Lease revenue	$ 13,900	$ 6,300	$ 21,800	$ 6,300

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	crl_
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Balance Type:	na
Period Type:	duration

X

- Definition

Contract With Customer Liability, Customer Deposits

+ References

No definition available.

+ Details

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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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Balance Type:	na
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X

- Definition

Contract With Customer, Terms Of Payment

+ References

No definition available.

+ Details

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

X

- Definition

Contract With Customer, Unpaid Advanced Client Billings

+ References

No definition available.

+ Details

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

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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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Namespace Prefix:	us-gaap_
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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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

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Namespace Prefix:	us-gaap_
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X

- References

No definition available.

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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 https://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 https://asc.fasb.org/extlink&oid=126900988&loc=SL77927221-108306

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