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Auto Loan Receivables (Allowance For Loan Losses) (Details) (USD $) In Millions, 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 | Aug. 31, 2014 | Feb. 28, 2014 | Aug. 31, 2013 | Feb. 28, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period | $ 77.8 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 65.9 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 69.9 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 57.3 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |  |  |  |  |  |  |  |
Charge-offs | (43.8)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  | (36.3)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  | (112.7)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  | (94.5)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  |  |  |  |  |  |  |  |
Recoveries | 22.3 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery |  | 18.6 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery |  | 62.9 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery |  | 56.1 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery |  |  |  |  |  |  |  |  |
Provision for loan losses | (24.1)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (19.7)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (60.3)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (49.0)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  |  |  |  |  |  |  |  |
Balance as of end of period | $ 80.4 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 67.9 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 80.4 us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 67.9 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |  |  |  |  |  |  |  |
Allowance For Loan Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total ending managed receivables | 0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.99%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.97%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.99%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1] | 0.97%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember | [1]
[1] | (1)Percentage of total ending managed receivables as of the corresponding reporting date.

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- Definition Item as percent of total ending managed receivables + References No definition available. + Details
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Namespace Prefix: | kmx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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