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Accumulated Other Comprehensive Loss (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2014 | Feb. 28, 2014
Accumulated Other Comprehensive Loss [Abstract] |  |
Deferred tax | $ 27.4 kmx_AccumulatedOtherComprehensiveIncomeLossDeferredTaxes | $ 27.7 kmx_AccumulatedOtherComprehensiveIncomeLossDeferredTaxes

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

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