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Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 28, 2015 | Dec. 27, 2014
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Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | $ 394,757 us-gaap_FiniteLivedIntangibleAssetsGross | $ 413,313 us-gaap_FiniteLivedIntangibleAssetsGross
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (228,953)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (237,876)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-Lived Intangible Assets, Net | 165,804 us-gaap_FiniteLivedIntangibleAssetsNet | 175,437 us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-lived intangibles assets | 3,438 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 3,438 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total other intangibles assets, net | 169,242 us-gaap_IntangibleAssetsNetExcludingGoodwill | 178,875 us-gaap_IntangibleAssetsNetExcludingGoodwill
Backlog [Member] |  |
Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | 8,574 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 8,728 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (8,027)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | (6,636)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Finite-Lived Intangible Assets, Net | 547 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 2,092 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Client Relationships [Member] |  |
Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | 361,287 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 379,339 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (208,866)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (217,938)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Net | 152,421 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 161,401 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Trademark and Trade Names [Member] |  |
Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | 6,533 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 6,603 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (5,396)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | (5,314)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Finite-Lived Intangible Assets, Net | 1,137 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 1,289 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Standard Operating Procedures [Member] |  |
Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | 2,302 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember | 2,309 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (1,738)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember | (1,642)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember
Finite-Lived Intangible Assets, Net | 564 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember | 667 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember
Other Intangible Assets [Member] |  |
Other intangible assets |  |
Other intangible assets subject to amortization, Gross Carrying Amount | 16,061 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 16,334 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Other intangible assets subject to amortization, Accumulated Amortization & Impairment Loss | (4,926)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (6,346)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Finite-Lived Intangible Assets, Net | $ 11,135 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 9,988 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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