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Commitments and Contingencies (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Sep. 27, 2014
Litigation [Line Items]        
Operating Leases, Future Minimum Payments Due $ 44,917,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Loss Contingency, Estimate of Possible Loss 1,500,000us-gaap_LossContingencyEstimateOfPossibleLoss      
Rent expense from operating leases 14,216,000us-gaap_LeaseAndRentalExpense 16,731,000us-gaap_LeaseAndRentalExpense 18,200,000us-gaap_LeaseAndRentalExpense  
Maximum insurance deductibles 500,000us-gaap_MalpracticeInsuranceDeductible1      
Future minimum payments under noncancellable operating leases        
2014 12,102,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
2015 9,854,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
2016 7,331,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
2017 4,284,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
2018 3,577,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Thereafter 7,769,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter      
Supplier arbitration [Member]        
Litigation [Line Items]        
Loss Contingency, Settlement Agreement, Terms       1600
Loss Contingency, Estimate of Possible Loss       $ 1,200,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= crl_SupplierarbitrationMember