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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Stockholders' Equity Note [Abstract]    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, OCI Before Reclassifications $ (48,499)crl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentOCIBeforeReclassifications $ (15,751)crl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentOCIBeforeReclassifications
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, OCI Before Reclassifications (42,236)crl_AccumulatedOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansOCIBeforeReclassifications 19,293crl_AccumulatedOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansOCIBeforeReclassifications
Accumulated Other Comprehensive Income (Loss), OCI Before Reclassifications (90,735)crl_AccumulatedOtherComprehensiveIncomeLossOCIBeforeReclassifications 3,542crl_AccumulatedOtherComprehensiveIncomeLossOCIBeforeReclassifications
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Reclassifications 0crl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentReclassifications 0crl_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentReclassifications
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Reclassifications 1,234crl_AccumulatedOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansReclassifications 3,017crl_AccumulatedOtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansReclassifications
Accumulated Other Comprehensive Income (Loss), Reclassifications 1,234crl_AccumulatedOtherComprehensiveIncomeLossReclassifications 3,017crl_AccumulatedOtherComprehensiveIncomeLossReclassifications
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Beginning Balance 28,503us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 44,057us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Pension Gains/(Losses) and Prior Service (Cost)/Credit Not Yet Recognized as Components of Net Periodic Benefit Costs, Beginning Balance (23,146)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (37,454)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive income (loss) 5,357us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 6,603us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Period Change (48,499)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (15,751)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other Comprehensive Income (Loss), Pension Gains/(Losses) and Prior Service (Cost)/Credit Not Yet Recognized as Components of Net Periodic Benefit Costs, Period change (41,002)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 22,310us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other Comprehensive Income (Loss), Net of Tax (89,501)us-gaap_OtherComprehensiveIncomeLossBeforeTax 6,559us-gaap_OtherComprehensiveIncomeLossBeforeTax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 105us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax 197us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Other Comprehensive Income (Loss), Pension Gains/(Losses) and Prior Service (Cost)/Credit Not Yet Recognized as Components of Net Periodic Benefit Costs, Tax 9,792us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (8,002)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Ending Balance (19,891)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 28,503us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Pension Gains/(Losses) and Prior Service (Cost)/Credit Not Yet Recognized as Components of Net Periodic Benefit Costs, Ending Balance (54,356)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (23,146)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive income (loss) (74,247)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 5,357us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest $ 9,897us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest $ (7,805)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest