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Long-Term Debt and Capital Lease Obligations - Schedule of Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 28, 2015 | Dec. 27, 2014
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Debt Instrument [Line Items] |  |
Total debt | $ 760,140 us-gaap_LongTermDebt | $ 753,750 us-gaap_LongTermDebt
Less: current portion of long-term debt | (31,696)us-gaap_LongTermDebtCurrent | (31,714)us-gaap_LongTermDebtCurrent
Long-term debt | 728,444 us-gaap_LongTermDebtNoncurrent | 722,036 us-gaap_LongTermDebtNoncurrent
Term loan facilities |  |
Debt Instrument [Line Items] |  |
Total debt | 367,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember | 378,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total debt | 392,426 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 375,536 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Other long-term debt |  |
Debt Instrument [Line Items] |  |
Total debt | $ 214 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crl_OtherLongTermDebtMember | $ 214 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crl_OtherLongTermDebtMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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