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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
Debt Instrument [Line Items]
Total debt	$ 760,140us-gaap_LongTermDebt	$ 753,750us-gaap_LongTermDebt
Less: current portion of long-term debt	(31,696)us-gaap_LongTermDebtCurrent	(31,714)us-gaap_LongTermDebtCurrent
Long-term debt	728,444us-gaap_LongTermDebtNoncurrent	722,036us-gaap_LongTermDebtNoncurrent
Term loan facilities
Debt Instrument [Line Items]
Total debt	367,500us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember	378,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_MediumTermNotesMember
Revolving credit facility
Debt Instrument [Line Items]
Total debt	392,426us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember	375,536us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Other long-term debt
Debt Instrument [Line Items]
Total debt	$ 214us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crl_OtherLongTermDebtMember	$ 214us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = crl_OtherLongTermDebtMember

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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)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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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)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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