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Business Acquisitions - Early Discovery, Additional Information (Details) In Millions, unless otherwise specified |  |  | 3 Months Ended
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Mar. 28, 2015 Early Discovery UK [Member] USD ($) | Mar. 28, 2015 Early Discovery UK [Member] EUR (€) | Apr. 01, 2014 Early Discovery UK [Member] USD ($) | Mar. 28, 2015 Selling, General and Administrative Expenses [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |
Acquisition purchase price |  |  | $ 191.8 crl_AcquisitionPurchasePrice / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |
Contingent consideration |  |  | 0.9 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |
Gain from contingent liability earn-out period |  |  |  | 0.8 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Aggregate undiscounted amount of contingent consideration | 5.4 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember | 5.0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |  |
Purchase price allocation, net of cash |  |  | 183.6 crl_Paymentsmadetoacquirebusinessnetofcashacquiredrounded / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |
Purchase price allocation, cash |  |  | $ 8.2 crl_CashAcquiredFromBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = crl_EarlyDiscoveryUKMember |

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- Definition Acquisition, Purchase Price + References No definition available. + Details
Name: | crl_AcquisitionPurchasePrice
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash Acquired From Business Acquisition + References No definition available. + Details
Name: | crl_CashAcquiredFromBusinessAcquisition
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition payments made to acquire business, net of cash acquired (rounded) + References No definition available. + Details
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Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant