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Lease Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Feb. 28, 2014 | Feb. 28, 2013 | Feb. 29, 2012
Leased Assets [Line Items] |  |  |
Operating leases rent expense | $ 43.6 | $ 42.8 | $ 42.3
Minimum [Member] |  |  |
Leased Assets [Line Items] |  |  |
Lease renewal term, years | 5 years |  |
Maximum [Member] |  |  |
Leased Assets [Line Items] |  |  |
Initial lease terms, in years | 20 years |  |
Lease renewal term, years | 20 years |  |

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- Definition Initial Lease Terms. + References No definition available. + Details
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- Details
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- Definition Lease renewal term + References No definition available. + Details
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Namespace Prefix: | kmx_
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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