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Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Increase in lease obligations	$ 2.3

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- Definition

Operating Leases, Future Minimum Payments, Due in Next Five Years, Increase

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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