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Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended
	Feb. 28, 2014 Designated As Hedging Instrument [Member]	Feb. 28, 2014 Designated As Hedging Instrument [Member] Interest Rate Swaps [Member]	Feb. 28, 2013 Designated As Hedging Instrument [Member] Interest Rate Swaps [Member]	Feb. 28, 2014 Not Designated As Hedging Instrument [Member] Interest Rate Caps [Member]	Feb. 28, 2013 Not Designated As Hedging Instrument [Member] Interest Rate Caps [Member]
Derivative [Line Items]
Additional reclassification as decrease from AOCL to CAF income	$ 9,300,000
Derivative notional amount		869,000,000	750,000,000	0
Offsetting notional amount of interest rate derivatives					$ 615,500,000

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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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
Period Type:	instant

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=7668309&loc=d3e80748-113994

+ Details

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- Details

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