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Segment Information - Revenue Per Significant Product or Service (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Segment Reporting Information [Line Items]
Revenue	$ 320,414us-gaap_Revenues	$ 299,368us-gaap_Revenues
Research Models and Services
Segment Reporting Information [Line Items]
Revenue	120,011us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember	132,495us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ResearchModelsAndServicesMember
Discovery and Safety Assessment
Segment Reporting Information [Line Items]
Revenue	140,012us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember	105,138us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_DiscoveryandSafetyAssessmentMember
Endotoxin and Microbial Detection
Segment Reporting Information [Line Items]
Revenue	32,826us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_EMDMember	32,465us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_EMDMember
Other manufacturing support
Segment Reporting Information [Line Items]
Revenue	27,565us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_OthermanufacturingsupportMember	29,270us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_OthermanufacturingsupportMember
Manufacturing Support
Segment Reporting Information [Line Items]
Revenue	$ 60,391us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember	$ 61,735us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = crl_ManufacturingSupportMember

X

- 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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