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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
Financing Receivable, By Major Credit Grade [Line Items]    
Total ending managed receivables $ 8,186.5us-gaap_NotesReceivableGross [1],[2] $ 7,184.4us-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 4,020.4us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= kmx_CreditGradeMember		 [2] 3,506.0us-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 2,969.7us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= kmx_CreditGradeBMember		 [2] 2,658.5us-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 $ 1,196.4us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= kmx_CreditGradeCAndOtherMember		 [2] $ 1,019.9us-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.