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Segment Information - Summary of Unallocated Corporate Overhead (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] |  |
Stock-based compensation expense | $ 9,674 us-gaap_AllocatedShareBasedCompensationExpense | $ 6,659 us-gaap_AllocatedShareBasedCompensationExpense
Depreciation expense | 17,100 us-gaap_Depreciation | 15,700 us-gaap_Depreciation
Unallocated corporate |  |
Segment Reporting Information [Line Items] |  |
Stock-based compensation expense | 6,280 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,702 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Salary, bonus and fringe | 10,696 crl_SalariesAndBonus / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 10,267 crl_SalariesAndBonus / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Consulting, audit and professional services | 3,641 crl_AuditTaxAndRelatedExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,231 crl_AuditTaxAndRelatedExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
IT related expenses | 1,864 us-gaap_CommunicationsAndInformationTechnology / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,577 us-gaap_CommunicationsAndInformationTechnology / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation expense | 1,898 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,839 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Acquisition related adjustments | (362)crl_TransactionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,305 crl_TransactionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Other general unallocated corporate expenses | 2,137 us-gaap_OtherGeneralExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,946 us-gaap_OtherGeneralExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Unallocated Corporate Overhead | $ 26,154 crl_UnallocatedCorporateOverhead / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 25,867 crl_UnallocatedCorporateOverhead / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition Represents the sum total of audit, tax and related expenses. + References No definition available. + Details
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- Definition Expenditures for salaries and bonuses for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense. + References No definition available. + Details
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- Definition Amount of direct costs of the business combination or disposition including legal, accounting, and other costs incurred to consummate the business acquisition or disposition. + References No definition available. + Details
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- Definition Represents the amount of unallocated corporate expenses. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense in the period for communications and data processing expense. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 Amount of general expenses not normally included in Other Operating Costs and Expenses. + 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 210.5-03.6) -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 6 -Article 5 + Details
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- Details
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