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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Interest and fee income | $ 152,700,000 us-gaap_InterestAndFeeIncomeLoansAndLeases |  | $ 138,300,000 us-gaap_InterestAndFeeIncomeLoansAndLeases |  | $ 450,400,000 us-gaap_InterestAndFeeIncomeLoansAndLeases |  | $ 409,000,000 us-gaap_InterestAndFeeIncomeLoansAndLeases |
Interest expense | (24,800,000)us-gaap_FinancingInterestExpense |  | (22,200,000)us-gaap_FinancingInterestExpense |  | (71,800,000)us-gaap_FinancingInterestExpense |  | (67,600,000)us-gaap_FinancingInterestExpense |
Total interest margin | 127,900,000 us-gaap_InterestIncomeExpenseNet |  | 116,100,000 us-gaap_InterestIncomeExpenseNet |  | 378,600,000 us-gaap_InterestIncomeExpenseNet |  | 341,400,000 us-gaap_InterestIncomeExpenseNet |
Provision for loan losses | (24,100,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (19,700,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (60,300,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (49,000,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses |
Total interest margin after provision for loan losses | 103,800,000 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |  | 96,400,000 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |  | 318,300,000 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |  | 292,400,000 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
Other income | 0 us-gaap_OtherNonoperatingIncome |  |  |  | 0 us-gaap_OtherNonoperatingIncome |  | 100,000 us-gaap_OtherNonoperatingIncome |
Payroll and fringe benefit expense | (6,300,000)us-gaap_LaborAndRelatedExpense |  | (5,600,000)us-gaap_LaborAndRelatedExpense |  | (18,800,000)us-gaap_LaborAndRelatedExpense |  | (16,700,000)us-gaap_LaborAndRelatedExpense |
Other direct expenses | (7,800,000)us-gaap_OtherCostAndExpenseOperating |  | (6,900,000)us-gaap_OtherCostAndExpenseOperating |  | (22,600,000)us-gaap_OtherCostAndExpenseOperating |  | (20,500,000)us-gaap_OtherCostAndExpenseOperating |
Total direct expenses | (14,100,000)us-gaap_DirectOperatingCosts |  | (12,500,000)us-gaap_DirectOperatingCosts |  | (41,400,000)us-gaap_DirectOperatingCosts |  | (37,200,000)us-gaap_DirectOperatingCosts |
CarMax Auto Finance income | 89,722,000 kmx_NetIncomeLossFromFinancing |  | 83,905,000 kmx_NetIncomeLossFromFinancing |  | 276,911,000 kmx_NetIncomeLossFromFinancing |  | 255,346,000 kmx_NetIncomeLossFromFinancing |
Average Balance of Loans Held in Porfolio | $ 8,026,200,000 kmx_Kmx_averageBalanceOfLoansHeldInPorfolio |  | $ 6,805,300,000 kmx_Kmx_averageBalanceOfLoansHeldInPorfolio |  | $ 7,713,600,000 kmx_Kmx_averageBalanceOfLoansHeldInPorfolio |  | $ 6,491,400,000 kmx_Kmx_averageBalanceOfLoansHeldInPorfolio |
Interest And Fee Income [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | 7.60%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestAndFeeIncomeMember | [1] | 8.10%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestAndFeeIncomeMember | [1] | 7.80%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestAndFeeIncomeMember | [1] | 8.40%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestAndFeeIncomeMember | [1]
Interest Expense [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | (1.20%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember | [1] | (1.30%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember | [1] | (1.20%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember | [1] | (1.40%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember | [1]
Total Interest Margin [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | 6.40%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestIncomeExpenseNetMember | [1] | 6.80%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestIncomeExpenseNetMember | [1] | 6.50%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestIncomeExpenseNetMember | [1] | 7.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_InterestIncomeExpenseNetMember | [1]
Provision For Loan Losses [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | (1.20%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_ProvisionForLoanLossesMember | [1] | (1.20%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_ProvisionForLoanLossesMember | [1] | (1.00%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_ProvisionForLoanLossesMember | [1] | (1.00%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_ProvisionForLoanLossesMember | [1]
Total Interest Margin After Provision For Loan Losses [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | 5.20%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalInterestMarginAfterProvisionForLoanLossesMember | [1] | 5.70%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalInterestMarginAfterProvisionForLoanLossesMember | [1] | 5.50%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalInterestMarginAfterProvisionForLoanLossesMember | [1] | 6.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalInterestMarginAfterProvisionForLoanLossesMember | [1]
Other Income [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | 0.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalOtherGainMember | [1] | 0.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalOtherGainMember | [1] | 0.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalOtherGainMember | [1] | 0.00%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalOtherGainMember | [1]
Payroll And Fringe Benefit Expense [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | (0.30%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_PayrollAndFringeBenefitExpenseMember | [1] | (0.30%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_PayrollAndFringeBenefitExpenseMember | [1] | (0.30%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_PayrollAndFringeBenefitExpenseMember | [1] | (0.30%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_PayrollAndFringeBenefitExpenseMember | [1]
Other Direct Expenses [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | (0.40%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_OtherDirectExpensesMember | [1] | (0.40%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_OtherDirectExpensesMember | [1] | (0.40%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_OtherDirectExpensesMember | [1] | (0.40%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_OtherDirectExpensesMember | [1]
Total Direct Expenses [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | (0.70%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalDirectExpensesMember | [1] | (0.70%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalDirectExpensesMember | [1] | (0.70%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalDirectExpensesMember | [1] | (0.80%)kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_TotalDirectExpensesMember | [1]
CAF Income [Member] |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |
Item as percent of total average managed receivables | 4.50%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_CarmaxAutoFinanceIncomeMember | [1] | 4.90%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_CarmaxAutoFinanceIncomeMember | [1] | 4.80%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_CarmaxAutoFinanceIncomeMember | [1] | 5.20%kmx_ItemAsPercentOfTotalAverageManagedReceivablesPrincipalOnly / us-gaap_StatementScenarioAxis = kmx_CarmaxAutoFinanceIncomeMember | [1]
[1] | Annualized percentage of total average managed receivables.

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