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Commitments and Contingencies (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Increase in lease obligations | $ 37.9

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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