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

X

- 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

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=crl_CDMOBusinessMember
Namespace Prefix:
Data Type:	na
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