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Note B - Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Details) | 12 Months Ended
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Apr. 30, 2018
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |
Property, and equipment (Year) | 3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |
Property, and equipment (Year) | 7 years
Leasehold Improvements [Member] | Minimum [Member] |
Property, and equipment (Year) | 5 years
Leasehold Improvements [Member] | Maximum [Member] |
Property, and equipment (Year) | 15 years
Building and Building Improvements [Member] | Minimum [Member] |
Property, and equipment (Year) | 18 years
Building and Building Improvements [Member] | Maximum [Member] |
Property, and equipment (Year) | 39 years

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=crmt_FurnitureFixturesAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |