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v2.4.1.9

Long-Term Debt and Capital Lease Obligations - Additional Information (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 28, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity, Term Loan and Line of Credit |  |  | $ 970,000,000 crl_MaximumBorrowingCapacityTermLoanAndLineOfCredit
Term loan facility |  |  | 420,000,000 us-gaap_SecuredLongTermDebt
Multi-currency revolving credit facility |  |  | 550,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Revolving credit facility, available increase | 350,000,000 crl_LineOfCreditFacilityBorrowingCapacityAvailableIncrease |  |
Weighted-average interest rate | 1.42%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 | 1.42%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |
Letters of credit outstanding | 5,000,000 us-gaap_LettersOfCreditOutstandingAmount | 5,000,000 us-gaap_LettersOfCreditOutstandingAmount |
Financing Obligation [Member] | Early Discovery UK [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Other capital lease obligations | 25,300,000 us-gaap_CapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember / us-gaap_LongtermDebtTypeAxis = crl_FinancingObligationMember | 23,100,000 us-gaap_CapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember / us-gaap_LongtermDebtTypeAxis = crl_FinancingObligationMember |
Other Capital Lease Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Other capital lease obligations | $ 1,000,000 us-gaap_CapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = crl_OtherCapitalLeaseObligationsMember | $ 1,000,000 us-gaap_CapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = crl_OtherCapitalLeaseObligationsMember |

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- Definition Represents the available increase in borrowing capacity of the debt instrument under specified circumstances. + References No definition available. + Details
Name: | crl_LineOfCreditFacilityBorrowingCapacityAvailableIncrease
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity, Term Loan and Line of Credit + References No definition available. + Details
Name: | crl_MaximumBorrowingCapacityTermLoanAndLineOfCredit
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + 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 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
Name: | us-gaap_CapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + 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
Name: | us-gaap_SecuredLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=crl_FinancingObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=crl_OtherCapitalLeaseObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |