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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 |
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Mar. 28, 2015 | Mar. 29, 2014 | Apr. 01, 2014
Definite-Lived Intangible Assets |  |  |
Client relationships |  |  | $ 94,000 crl_FiniteLivedIntangibleAssetsAcquiredCustomerRelationships
Backlog |  |  | 5,900 crl_FiniteLivedIntangibleAssetsAcquiredBacklog
Trademark and trade names |  |  | 1,170 crl_FiniteLivedIntangibleAssetsAcquiredTrademarksandTradeNames
Leasehold interests |  |  | 1,000 crl_FiniteLivedIntangibleAssetsAcquiredLeaseholdInterests
Other intangible assets |  |  | 2,400 crl_FiniteLivedIntangibleAssetsAcquiredOtherIntangibleAssets
Total definite-lived intangible assets |  |  | 104,470 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Acquisition related adjustments (less than $0.1 million) | $ 100 crl_TransactionCosts | $ 3,300 crl_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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- Definition 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 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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