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Fair Value - Redeemable Noncontrolling Interest (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Fair Value Disclosures [Abstract]    
Percentage of voting interests acquired 75.00%us-gaap_MinorityInterestOwnershipPercentageByParent  
Remaining ownership percentage available 25.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
Total gains or losses (realized/unrealized):    
Discount rate 18.50%us-gaap_FairValueInputsDiscountRate  
Level 3 | Redeemable Noncontrolling Interest [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 28,419us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
$ 20,581us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
Additions 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
Total gains or losses (realized/unrealized):    
Net income (loss) attributable to noncontrolling interest (130)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
Foreign currency translation 78us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
(476)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
Change in fair value, included in additional paid-in capital 1,086crl_FairValueMeasurementwithUnobservableInputsReconciliationLiabilityChangeinFairValueIncludedinAdditionalPaidInCapital
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
1,473crl_FairValueMeasurementwithUnobservableInputsReconciliationLiabilityChangeinFairValueIncludedinAdditionalPaidInCapital
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
Ending balance $ 29,453us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember
$ 21,579us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= crl_RedeemableNoncontrollingInterestMember