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Segment Information - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 26, 2015 USD ($)
Operating segments | Manufacturing Support
Segment Reporting Information [Line Items]
Increase in manufacturing segment assets	$ 300.5

X

- Definition

Change in manufacturing segment assets since prior year end.

+ References

No definition available.

+ Details

Name:	crl_ChangeinMSassets
Namespace Prefix:	crl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=crl_ManufacturingSupportMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: