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Auto Loan Receivables (Ending Managed Receivables By Major Credit Grade) (Details) (USD $) In Millions, unless otherwise specified | Nov. 30, 2014 | Feb. 28, 2014
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Financing Receivable, By Major Credit Grade [Line Items] |  |  |  |
Total ending managed receivables | $ 8,186.5 us-gaap_NotesReceivableGross | [1],[2] | $ 7,184.4 us-gaap_NotesReceivableGross | [1],[2]
Total ending managed receivables as percentage by major credit grade | 100.00%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade | [3] | 100.00%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade | [3]
Credit Grade A [Member] |  |  |  |
Financing Receivable, By Major Credit Grade [Line Items] |  |  |  |
Total ending managed receivables | 4,020.4 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeMember | [2] | 3,506.0 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeMember | [2]
Total ending managed receivables as percentage by major credit grade | 49.10%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeMember | [3] | 48.80%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeMember | [3]
Credit Grade B [Member] |  |  |  |
Financing Receivable, By Major Credit Grade [Line Items] |  |  |  |
Total ending managed receivables | 2,969.7 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeBMember | [2] | 2,658.5 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeBMember | [2]
Total ending managed receivables as percentage by major credit grade | 36.30%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeBMember | [3] | 37.00%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeBMember | [3]
Credit Grade C And Other [Member] |  |  |  |
Financing Receivable, By Major Credit Grade [Line Items] |  |  |  |
Total ending managed receivables | $ 1,196.4 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeCAndOtherMember | [2] | $ 1,019.9 us-gaap_NotesReceivableGross / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeCAndOtherMember | [2]
Total ending managed receivables as percentage by major credit grade | 14.60%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeCAndOtherMember | [3] | 14.20%kmx_TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade / us-gaap_InternalCreditAssessmentAxis = kmx_CreditGradeCAndOtherMember | [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] | Percentage of total ending managed receivables.

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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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