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v3.25.4

Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ in Millions | Nov. 30, 2025 | Feb. 28, 2025
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Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Deferred tax | $ 8.2 | $ 1.5

X
- Definition The balance of deferred taxes on items remaining in accumulated other comprehensive income loss + References No definition available. + Details
Name: | kmx_AccumulatedOtherComprehensiveIncomeLossDeferredTaxes
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ComprehensiveIncomeNetOfTaxAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration