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Cancellation Reserves (Tables) | 6 Months Ended
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Aug. 31, 2024
Cancellation Reserves [Abstract] |
Schedule Of Cancellation Reserves Accrual | Cancellation Reserves
| Three Months Ended August 31 |  | Six Months Ended August 31
(In millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Balance as of beginning of period | $ | 131.3 |  |  | $ | 138.7 |  |  | $ | 128.3 |  |  | $ | 139.2 |
Cancellations | (22.6) |  |  | (23.2) |  |  | (43.9) |  |  | (47.8) |
Provision for future cancellations | 25.0 |  |  | 21.1 |  |  | 49.3 |  |  | 45.2 |
Balance as of end of period | $ | 133.7 |  |  | $ | 136.6 |  |  | $ | 133.7 |  |  | $ | 136.6 |

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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-types1:textBlockItemType
Balance Type: | na
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