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Net Earnings Per Share (Basic And Dilutive Net Earnings Per Share Reconciliations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items] |  |  |  |
Net earnings | $ 130,049 us-gaap_NetIncomeLoss | $ 106,452 us-gaap_NetIncomeLoss | $ 454,220 us-gaap_NetIncomeLoss | $ 393,377 us-gaap_NetIncomeLoss
Weighted average common shares outstanding | 214,228 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 223,259 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 217,568 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 223,831 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common shares and dilutive potential common shares | 217,025 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 227,417 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 220,585 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 227,870 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net earnings per share | $ 0.61 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 2.09 us-gaap_EarningsPerShareBasic | $ 1.76 us-gaap_EarningsPerShareBasic
Diluted net earnings per share | $ 0.60 us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 2.06 us-gaap_EarningsPerShareDiluted | $ 1.73 us-gaap_EarningsPerShareDiluted
Stock Options [Member] |  |  |  |
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items] |  |  |  |
Dilutive potential common shares | 2,105 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 3,402 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 2,382 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 3,305 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Stock-Settled Restricted Stock Units [Member] |  |  |  |
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items] |  |  |  |
Dilutive potential common shares | 692 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kmx_StockSettledRestrictedStockUnitsMember | 756 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kmx_StockSettledRestrictedStockUnitsMember | 635 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kmx_StockSettledRestrictedStockUnitsMember | 734 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kmx_StockSettledRestrictedStockUnitsMember

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