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Note L - Commitments and Contingencies (Details) (USD $) | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Note L - Commitments and Contingencies (Details) [Line Items] |  |  |
Letters of Credit Outstanding, Amount | $ 1,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |
Operating Leases, Future Minimum Payments Due | 39,578,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Operating Leases, Rent Expense | 5,500,000 us-gaap_LeaseAndRentalExpense | 5,200,000 us-gaap_LeaseAndRentalExpense | 4,700,000 us-gaap_LeaseAndRentalExpense
Non Cancelable [Member] |  |  |
Note L - Commitments and Contingencies (Details) [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due | 14,800,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_StatementScenarioAxis = crmt_NonCancelableMember |  |
Reasonably Assured [Member] |  |  |
Note L - Commitments and Contingencies (Details) [Line Items] |  |  |
Operating Leases, Future Minimum Payments Due | $ 24,800,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_StatementScenarioAxis = crmt_ReasonablyAssuredMember |  |
Minimum [Member] |  |  |
Note L - Commitments and Contingencies (Details) [Line Items] |  |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 3 years |  |
Maximum [Member] |  |  |
Note L - Commitments and Contingencies (Details) [Line Items] |  |  |
Lessee Leasing Arrangements, Operating Leases, Renewal Term | 5 years |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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