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Business Acquisitions - Early Discovery Purchase Price Allocation (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Apr. 01, 2014
Business Acquisition [Line Items]      
Goodwill $ 313,159us-gaap_Goodwill $ 321,077us-gaap_Goodwill  
Early Discovery UK [Member]      
Business Acquisition [Line Items]      
Current assets (excluding cash)     31,682us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Property, plant and equipment     21,008us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Other long term assets     11,140us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Definite-lived intangible assets     104,470us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Goodwill     65,235us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Current liabilities     (13,139)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Long term liabilities     (36,802)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember
Total purchase price allocation     $ 183,594crl_PaymentstoAcquireBusinessNetofCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= crl_EarlyDiscoveryUKMember