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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Increase in lease obligations | $ 40.1

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- Definition Operating Leases, Future Minimum Payments, Due in Next Five Years, Increase + References No definition available. + Details
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Namespace Prefix: | crl_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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