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Note C - Finance Receivables, Net (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2016 | May 30, 2016 | Oct. 31, 2019 | Oct. 31, 2018 | Apr. 30, 2019
Finance Receivables, Weighted Average Interest Rate |  |  | 16.40% |  |
Finance Receivables, Number of Loan Classes |  |  | 1 |  |
Finance Receivables, Number of Risk Pools |  |  | 1 |  |
Net Charge Offs as Percentage of Average Finance Receivables |  |  | 11.50% | 13.00% |
Collections as Percentage of Average Financing Receivables |  |  | 26.80% | 26.00% |
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables |  |  | 3.50% | 3.40% |
Financing Receivable, Allowance for Credit Loss, Percentage |  |  | 24.50% |  | 25.00%
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | $ 2.6 |  |
Financing Receivable, Credit Loss, Expense (Reversal), Net of Tax, From Change in Allowance Percentage |  |  | $ (2.0) |  |
Financing Receivable, Credit Loss, Expense (Reversal), per Diluted Share |  |  | $ 0.29 |  |
Minimum [Member] |  |  |  |  |
Financing Receivable Interest Rate |  |  | 15.00% |  |
Financing Receivable Payment Period |  |  | 1 year 180 days |  |
Maximum [Member] |  |  |  |  |
Financing Receivable Interest Rate | 16.50% | 15.00% | 16.50% |  |
Financing Receivable Payment Period |  |  | 4 years |  |

X
- Definition Represents the percentage of average financing receivables collected during the reported period. + References No definition available. + Details
Name: | crmt_CollectionsAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Delinquencies greater than 30 days as a percentage of average finance receivables. + References No definition available. + Details
Name: | crmt_DelinquenciesGreaterThan30DaysAsPercentageOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of loan classes of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfLoanClasses
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of risk pools of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesNumberOfRiskPools
Namespace Prefix: | crmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average interest rate of finance receivables. + References No definition available. + Details
Name: | crmt_FinanceReceivablesWeightedAverageInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of allowance for credit loss on financing receivables. + References No definition available. + Details
Name: | crmt_FinancingReceivableAllowanceForCreditLossPercentage
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable, net of tax, due to change in allowance percentage. + References No definition available. + Details
Name: | crmt_FinancingReceivableCreditLossExpenseReversalNetOfTaxFromChangeInAllowancePercentage
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable, per diluted share. + References No definition available. + Details
Name: | crmt_FinancingReceivableCreditLossExpenseReversalPerDilutedShare
Namespace Prefix: | crmt_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the interest rate on installment sale contracts. + References No definition available. + Details
Name: | crmt_FinancingReceivableInterestRate
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the payment period on installment sale contracts from the sale of used vehicles. + References No definition available. + Details
Name: | crmt_FinancingReceivablePaymentPeriod
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of average finance receivables charged off. + References No definition available. + Details
Name: | crmt_NetChargeOffsAsPercentageOfAverageFinanceReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Period Type: |