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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 | $ 313,159 us-gaap_Goodwill |  |  | $ 321,077 us-gaap_Goodwill
Total purchase price allocation | 893 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
ChanTest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets (excluding cash) |  |  | 4,648 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember |
Property, plant and equipment |  |  | 1,579 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember |
Definite-lived intangible assets |  |  | 23,920 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember |
Goodwill |  |  | 34,927 us-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 |  |  | $ 52,073 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = crl_ChanTestCorporationMember |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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