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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details) | 6 Months Ended
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Oct. 31, 2021 | Oct. 31, 2020
Principal collected as a percent of average finance receivables | 21.90% | 25.90%
Average down-payment percentage | 6.40% | 6.90%
Average originating contract term (in months) (Month) | 39 months 21 days | 33 months 3 days
Portfolio weighted average contract term, including modifications (in months) (Month) | 40 months | 34 months 21 days

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- Definition Average down-payment percentage + References No definition available. + Details
Name: | crmt_AverageDownpaymentPercentage
Namespace Prefix: | crmt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Average originating contract term. + References No definition available. + Details
Name: | crmt_AverageOriginatingContractTerm
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Portfolio weighted average contract term, including modifications. + References No definition available. + Details
Name: | crmt_PortfolioWeightedAverageContractTermIncludingModifications
Namespace Prefix: | crmt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the principal collected as a percent of average finance receivables. + References No definition available. + Details
Name: | crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant