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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014
Segment Reporting Information [Line Items] |  |
Revenue | $ 320,414 us-gaap_Revenues | $ 299,368 us-gaap_Revenues
Operating income | 43,005 us-gaap_OperatingIncomeLoss | 39,706 us-gaap_OperatingIncomeLoss
Depreciation and amortization | 22,368 us-gaap_DepreciationDepletionAndAmortization | 20,050 us-gaap_DepreciationDepletionAndAmortization
Capital expenditures | 10,648 us-gaap_PaymentsToAcquireProductiveAssets | 11,190 us-gaap_PaymentsToAcquireProductiveAssets
Research Models and Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 120,011 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember | 132,495 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Gross margin | 45,804 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember | 51,647 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Operating income | 28,845 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember | 35,444 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Depreciation and amortization | 6,045 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember | 6,441 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Capital expenditures | 2,733 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember | 4,099 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Discovery and Safety Assessment |  |
Segment Reporting Information [Line Items] |  |
Revenue | 140,012 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember | 105,138 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Gross margin | 43,683 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember | 25,659 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Operating income | 23,516 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember | 11,713 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Depreciation and amortization | 11,139 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember | 8,142 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Capital expenditures | 5,378 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember | 4,036 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Manufacturing Support |  |
Segment Reporting Information [Line Items] |  |
Revenue | 60,391 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember | 61,735 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember
Gross margin | 30,173 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember | 31,507 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember
Operating income | 16,798 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember | 18,416 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember
Depreciation and amortization | 3,286 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember | 3,628 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember
Capital expenditures | $ 1,566 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember | $ 2,264 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + 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 (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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