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Cancellation Reserves (Tables) | 9 Months Ended
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Nov. 30, 2021
Cancellation Reserves [Abstract] |
Schedule Of Cancellation Reserves Accrual | Cancellation Reserves
| Three Months Ended November 30 |  | Nine Months Ended November 30
(In millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Balance as of beginning of period | $ | 144.3 |  |  | $ | 122.6 |  |  | $ | 124.5 |  |  | $ | 117.9 |
Cancellations | (25.2) |  |  | (17.4) |  |  | (68.3) |  |  | (48.3) |
Provision for future cancellations | 28.7 |  |  | 17.9 |  |  | 91.6 |  |  | 53.5 |
Balance as of end of period | $ | 147.8 |  |  | $ | 123.1 |  |  | $ | 147.8 |  |  | $ | 123.1 |

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