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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details) - USD ($) | 9 Months Ended
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Jan. 31, 2022 | Jan. 31, 2021
Average total collected per active customer per month | $ 487 | $ 449
Principal collected as a percent of average finance receivables | 31.70% | 38.00%
Average down-payment percentage | 6.10% | 6.40%
Average originating contract term (in months) (Month) | 39 months 18 days | 33 months 21 days
Portfolio weighted average contract term, including modifications (in months) (Month) | 41 months 6 days | 35 months 21 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