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FAIR VALUE - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Transfers between fair value levels	$ 0	$ 0

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- Definition

Transfers between fair value levels

+ References

No definition available.

+ Details

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