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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 28, 2019 | Dec. 29, 2018
Revenue from Contract with Customer [Abstract] |  |
Payment terms | 30 days |
Unpaid advanced client billings | $ 21,000 |
Contract liabilities (customer contract deposits) | $ 36,006 | $ 38,245
Percentage of unbilled revenue billed during period | 85.00% |
Percentage of contract liabilities recognized as revenue during period | 80.00% |

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- Definition Contract With Customer, Asset, Percentage Of Amount Reclassified to Receivable + References No definition available. + Details
Name: | crl_ContractWithCustomerAssetPercentageOfAmountReclassifiedtoReceivable
Namespace Prefix: | crl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer Liability, Customer Deposits + References No definition available. + Details
Name: | crl_ContractWithCustomerLiabilityCustomerDeposits
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer, Percentage Of Liabilities, Recognized As Revenue + References No definition available. + Details
Name: | crl_ContractWithCustomerPercentageOfLiabilitiesRecognizedAsRevenue
Namespace Prefix: | crl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer, Unpaid Advanced Client Billings + References No definition available. + Details
Name: | crl_ContractWithCustomerUnpaidAdvancedClientBillings
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Terms Of Payment + References No definition available. + Details
Name: | crl_ContractwithCustomerTermsOfPayment
Namespace Prefix: | crl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration