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Auto Loan Receivables (Past Due Receivables) (Details) (USD $) In Millions, unless otherwise specified | Nov. 30, 2014 | Feb. 28, 2014
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Financing Receivable, Past Due [Line Items] |  |  |  |
Total ending managed receivables | $ 8,186.5 us-gaap_NotesReceivableGross | [1],[2] | $ 7,184.4 us-gaap_NotesReceivableGross | [1],[2]
31-60 days past due | 173.6 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue |  | 126.6 us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue |
61-90 days past due | 60.0 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue |  | 42.6 us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue |
Greater than 90 days past due | 17.4 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |  | 16.0 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |
Total past due | $ 251.0 us-gaap_FinancingReceivableRecordedInvestmentPastDue |  | $ 185.2 us-gaap_FinancingReceivableRecordedInvestmentPastDue |
Past due receivables as a percentage of total ending managed receivables | 3.10%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables | [3] | 2.60%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables | [3]
Managed Receivables [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Item as percent of total ending managed receivables | 100.00%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_ManagedReceivablesMember | [3] | 100.00%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_ManagedReceivablesMember | [3]
31-60 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Past due receivables as a percentage of total ending managed receivables | 2.20%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_ThirtyOneToSixtyDaysPastDueMember | [3] | 1.80%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_ThirtyOneToSixtyDaysPastDueMember | [3]
61-90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Past due receivables as a percentage of total ending managed receivables | 0.70%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_SixtyOneToNinetyDaysPastDueMember | [3] | 0.60%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_SixtyOneToNinetyDaysPastDueMember | [3]
Greater Than 90 Days Past Due [Member] |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Past due receivables as a percentage of total ending managed receivables | 0.20%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_GreaterThanNinetyDaysPastDueMember | [3] | 0.20%kmx_PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = kmx_GreaterThanNinetyDaysPastDueMember | [3]
[1] | Other receivables includes receivables not funded through the warehouse facilities or term securitizations.
[2] | Classified based on credit grade assigned when customers were initially approved for financing.
[3] | (1)Percentage of total ending managed receivables.

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- Definition Past due receivables as a percentage of total ending managed receivables. + References No definition available. + Details
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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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