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Derivative Instruments And Hedging Activities (Narrative) (Details) (Interest Rate Swaps [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Nov. 30, 2014	Feb. 28, 2014
Designated As Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Additional reclassification as decrease from AOCL to CAF income	$ 11.1us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Derivative notional amount	1,051.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember	869.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Offsetting notional amount of interest rate derivatives	$ 0kmx_OffsettingNotionalAmountOfInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember	$ 0kmx_OffsettingNotionalAmountOfInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Aggregate offsetting notional amount of all interest rate derivatives not designated as hedging instruments. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	kmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

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- Details

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- Details

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- Details

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