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Business Acquisitions - Early Discovery Breakout of Definite-Lived Intangible Assets Acquired (Details) (Early Discovery UK [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Apr. 01, 2014
Definite-Lived Intangible Assets
Client relationships			$ 94,000crl_FiniteLivedIntangibleAssetsAcquiredCustomerRelationships
Backlog			5,900crl_FiniteLivedIntangibleAssetsAcquiredBacklog
Trademark and trade names			1,170crl_FiniteLivedIntangibleAssetsAcquiredTrademarksandTradeNames
Leasehold interests			1,000crl_FiniteLivedIntangibleAssetsAcquiredLeaseholdInterests
Other intangible assets			2,400crl_FiniteLivedIntangibleAssetsAcquiredOtherIntangibleAssets
Total definite-lived intangible assets			104,470us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Acquisition related adjustments (less than $0.1 million)	$ 100crl_TransactionCosts	$ 3,300crl_TransactionCosts
Client Relationships [Member]
Definite-Lived Intangible Assets
Weighted average amortization life	18 years
Backlog [Member]
Definite-Lived Intangible Assets
Weighted average amortization life	1 year
Trademark and Trade Names [Member]
Definite-Lived Intangible Assets
Weighted average amortization life	3 years
Leasehold Interests [Member]
Definite-Lived Intangible Assets
Weighted average amortization life	13 years
Other Intangible Assets [Member]
Definite-Lived Intangible Assets
Weighted average amortization life	19 years

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Amount of direct costs of the business combination or disposition including legal, accounting, and other costs incurred to consummate the business acquisition or disposition.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

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The amount of identifiable intangible assets recognized as of the acquisition date.

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