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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details) | 6 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017
Principal collected as a percent of average finance receivables | 26.00% | 24.60%
Average down-payment percentage | 6.00% | 6.00%
Average originating contract term (Month) | 2 years 165 days | 2 years 168 days

X
- Definition Average down-payment percentage + References No definition available. + Details
Name: | crmt_AverageDownpaymentPercentage
Namespace Prefix: | crmt_
Data Type: | num: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 Represents the principal collected as a percent of average finance receivables. + References No definition available. + Details
Name: | crmt_PrincipalCollectedAsAPercentOfAverageFinancingReceivables
Namespace Prefix: | crmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant