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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021
Average total collected per active customer per month | $ 513 | $ 478
Principal collected as a percent of average finance receivables | 43.50% | 53.20%
Average down-payment percentage | 6.40% | 7.10%
Average originating contract term (in months) (Month) | 40 months 6 days | 34 months 18 days
Portfolio weighted average contract term, including modifications (in months) (Year) | 42 years 10 months 24 days | 37 years 3 months 18 days

X
- Definition Average amount of collected balance per customer per month. + References No definition available. + Details
Name: | crmt_AverageCollectedAmountPerCustomerPerMonth
Namespace Prefix: | crmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- 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

X
- 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

X
- 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