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v3.21.2

Note B - Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Details) | 3 Months Ended
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Jul. 31, 2021
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 3 years
Minimum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 5 years
Minimum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 18 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment, Useful Life (Year) | 7 years
Maximum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 15 years
Maximum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment, Useful Life (Year) | 39 years

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=crmt_FurnitureFixturesAndEquipmentMember
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: |

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