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Business Acquisitions - Chan Test Preliminary Purchase Price (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Oct. 29, 2014	Dec. 27, 2014
Business Acquisition [Line Items]
Goodwill	$ 313,159us-gaap_Goodwill			$ 321,077us-gaap_Goodwill
Total purchase price allocation	893us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
ChanTest
Business Acquisition [Line Items]
Current assets (excluding cash)			4,648us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Property, plant and equipment			1,579us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Definite-lived intangible assets			23,920us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Goodwill			34,927us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Current liabilities			(3,515)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Long-term liabilities			(9,486)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember
Total purchase price allocation			$ 52,073us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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