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Cancellation Reserves (Tables) | 9 Months Ended
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Nov. 30, 2025
Cancellation Reserves [Abstract] |
Schedule Of Cancellation Reserves Accrual | Cancellation Reserves
| Three Months Ended November 30 |  | Nine Months Ended November 30
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Balance as of beginning of period | $ | 135.9 |  |  | $ | 133.7 |  |  | $ | 133.9 |  |  | $ | 128.3 |
Cancellations | (19.5) |  |  | (24.9) |  |  | (59.4) |  |  | (68.8) |
Provision for future cancellations | 15.3 |  |  | 25.7 |  |  | 57.2 |  |  | 75.0 |
Balance as of end of period | $ | 131.7 |  |  | $ | 134.5 |  |  | $ | 131.7 |  |  | $ | 134.5 |

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- Definition Contract Cancellation Reserve [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | kmx_
Data Type: | dtr-types:textBlockItemType
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Period Type: | duration

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- Definition Contract Cancellation Reserves [Abstract] + References No definition available. + Details
Name: | kmx_ContractCancellationReservesAbstract
Namespace Prefix: | kmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration