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Accumulated Other Comprehensive Loss (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Aug. 31, 2014	Feb. 28, 2014
Accumulated Other Comprehensive Loss [Abstract]
Deferred tax	$ 26.5	$ 27.7

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:	duration

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- Details

Name:	us-gaap_ComprehensiveIncomeNetOfTaxAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration