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Accumulated Other Comprehensive Loss (Narrative) (Details) - USD ($) $ in Millions	Feb. 28, 2021	Feb. 29, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Deferred tax	$ 38.7	$ 48.8

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- 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