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Note C - Finance Receivables, Net - Financing Receivables Analysis (Details) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Principal collected as a percent of average finance receivables | 55.30% | 53.10%
Average down-payment percentage | 6.50% | 6.40%

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 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