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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
Other intangible assets
Other intangible assets subject to amortization, Gross Carrying Amount	$ 394,757us-gaap_FiniteLivedIntangibleAssetsGross	$ 413,313us-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	165,804us-gaap_FiniteLivedIntangibleAssetsNet	175,437us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-lived intangibles assets	3,438us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	3,438us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total other intangibles assets, net	169,242us-gaap_IntangibleAssetsNetExcludingGoodwill	178,875us-gaap_IntangibleAssetsNetExcludingGoodwill
Backlog [Member]
Other intangible assets
Other intangible assets subject to amortization, Gross Carrying Amount	8,574us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	8,728us-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	547us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	2,092us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Client Relationships [Member]
Other intangible assets
Other intangible assets subject to amortization, Gross Carrying Amount	361,287us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	379,339us-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	152,421us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	161,401us-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	6,533us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember	6,603us-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	1,137us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember	1,289us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Standard Operating Procedures [Member]
Other intangible assets
Other intangible assets subject to amortization, Gross Carrying Amount	2,302us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember	2,309us-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	564us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember	667us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = crl_StandardOperatingProceduresMember
Other Intangible Assets [Member]
Other intangible assets
Other intangible assets subject to amortization, Gross Carrying Amount	16,061us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	16,334us-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	$ 11,135us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	$ 9,988us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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