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Debt Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($) $ in Thousands | Feb. 28, 2021 | Feb. 29, 2020
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Maturities of Long-term Debt [Abstract] |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 53,129 |
FinancingObligationPaymentsDueYearTwo | 53,780 |
FinancingObligationsPaymentsDueYearThree | 56,075 |
FinancingObligationsPaymentsDueYearFour | 54,747 |
FinancingObligationsPaymentsDueYearFive | 57,943 |
FinancingObligationsPaymentsDueAfterYearFive | 845,920 |
FinancingObligationsPaymentsDue | 1,121,594 |
FinancingObligationsUndiscountedExcessAmount | (588,016) |
Financing Obligations | $ 533,578 | $ 536,739

X
- Definition Amount of undiscounted obligation for payments under financing obligations, due is next fiscal year. + References No definition available. + Details
Name: | kmx_FinancingObligationPaymentsDueNextFiscalYear
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition FinancingObligationPaymentsDueYearTwo + References No definition available. + Details
Name: | kmx_FinancingObligationPaymentsDueYearTwo
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents obligations under sale-leaseback transactions that did not qualify for sale accounting + References No definition available. + Details
Name: | kmx_FinancingObligations
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FinancingObligationsPaymentsDue + References No definition available. + Details
Name: | kmx_FinancingObligationsPaymentsDue
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FinancingObligationsPaymentsDueAfterYearFive + References No definition available. + Details
Name: | kmx_FinancingObligationsPaymentsDueAfterYearFive
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FinancingObligationsPaymentsDueYearFive + References No definition available. + Details
Name: | kmx_FinancingObligationsPaymentsDueYearFive
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FinancingObligationsPaymentsDueYearFour + References No definition available. + Details
Name: | kmx_FinancingObligationsPaymentsDueYearFour
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FinancingObligationsPaymentsDueYearThree + References No definition available. + Details
Name: | kmx_FinancingObligationsPaymentsDueYearThree
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing Obligations Undiscounted Excess Amount + References No definition available. + Details
Name: | kmx_FinancingObligationsUndiscountedExcessAmount
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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