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SUBSEQUENT EVENTS - Narrative (Details) - Subsequent Event - Disposal Group, Held-for-sale, Not Discontinued Operations - CDMO Business | Feb. 10, 2017 USD ($)
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Subsequent Event [Line Items] |
Cash received from disposal | $ 75,000,000
Percentage of revenue from business disposed | 1.00%

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- Definition Revenue from Individual Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Percent + References No definition available. + Details
Name: | crl_RevenuefromIndividualSignificantComponentDisposedoforHeldforsaleExcludingDiscontinuedOperationsPercent
Namespace Prefix: | crl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=crl_CDMOBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |