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Segment Information - Revenue Per Significant Product or Service (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
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
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
Endotoxin and Microbial Detection |  |
Segment Reporting Information [Line Items] |  |
Revenue | 32,826 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_EMDMember | 32,465 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_EMDMember
Other manufacturing support |  |
Segment Reporting Information [Line Items] |  |
Revenue | 27,565 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_OthermanufacturingsupportMember | 29,270 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_OthermanufacturingsupportMember
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

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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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