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v2.4.1.9

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 28, 2015
Loss Contingencies [Line Items] |
Increase in lease obligations | $ 6.9 crl_OperatingLeasesFutureMinimumPaymentsDueinNextFiveYearsIncrease
Government billing [Member] |
Loss Contingencies [Line Items] |
Reserve for estimated possible loss | $ 1.5 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = crl_GovernmentbillingMember

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=crl_GovernmentbillingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |