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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (as a percentage)	1.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	24.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Reduction in unrecognized tax benefits and related interest	$ 10.4us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Income Tax Uncertainties [Abstract]
Decrease in unrecognized tax benefits	11.5us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Unrecognized tax benefits	23.1us-gaap_UnrecognizedTaxBenefits
Decrease in unrecognized tax benefits, that if recognized would impact the effective tax rate	11.8crl_UnrecognizedTaxBenefitsthatWouldImpactEffectiveTaxRatePeriodIncreaseDecrease
Unrecognized tax benefits that would impact effective tax rate favorably, if recognized	20.5us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Interest related to unrecognized income tax benefits	0.9us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Possible decrease of unrecognized tax benefits	$ 2.9us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit

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Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Period Increase (Decrease)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(h)(2))

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Glossary Unrecognized Tax Benefit

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Amount of interest expense accrued for an underpayment of income taxes.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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