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Auto Loan Receivables (Auto Loan Receivables, Net) (Details) (USD $) | Nov. 30, 2014 | Aug. 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | Feb. 28, 2013
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Non-recourse notes payable | $ 8,180,000,000 us-gaap_NonRecourseDebt |  |  | $ 7,250,000,000 us-gaap_NonRecourseDebt |  |  |  |
Total ending managed receivables | 8,186,500,000 us-gaap_NotesReceivableGross | [1],[2] |  | 7,184,400,000 us-gaap_NotesReceivableGross | [1],[2] |  |  |
Accrued interest and fees | 32,700,000 us-gaap_InterestReceivable |  |  | 26,300,000 us-gaap_InterestReceivable |  |  |  |
Other | (500,000)us-gaap_OtherReceivables |  |  | 7,000,000 us-gaap_OtherReceivables |  |  |  |
Less allowance for loan losses | (80,400,000)us-gaap_FinancingReceivableAllowanceForCreditLosses |  | (77,800,000)us-gaap_FinancingReceivableAllowanceForCreditLosses | (69,900,000)us-gaap_FinancingReceivableAllowanceForCreditLosses |  | (67,900,000)us-gaap_FinancingReceivableAllowanceForCreditLosses | (65,900,000)us-gaap_FinancingReceivableAllowanceForCreditLosses | (57,300,000)us-gaap_FinancingReceivableAllowanceForCreditLosses
Auto loan receivables, net | 8,138,307,000 us-gaap_NotesReceivableNet |  |  | 7,147,848,000 us-gaap_NotesReceivableNet |  |  |  |
Warehouse Facilities [Member] |  |  |  |  |  |  |  |
Total ending managed receivables | 959,000,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_WarehouseFacilitiesReceivablesMember |  |  | 879,000,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_WarehouseFacilitiesReceivablesMember |  |  |  |
Term Securitizations [Member] |  |  |  |  |  |  |  |
Total ending managed receivables | 6,979,600,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_TermSecuritizationsMember |  |  | 6,145,500,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_TermSecuritizationsMember |  |  |  |
Other Receivables [Member] |  |  |  |  |  |  |  |
Total ending managed receivables | $ 247,900,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_OtherReceivablesMember |  |  | $ 159,900,000 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = kmx_OtherReceivablesMember |  |  |  |
[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.

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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 Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + 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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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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