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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
Non-recourse notes payable $ 8,180,000,000us-gaap_NonRecourseDebt   $ 7,250,000,000us-gaap_NonRecourseDebt      
Total ending managed receivables 8,186,500,000us-gaap_NotesReceivableGross [1],[2]   7,184,400,000us-gaap_NotesReceivableGross [1],[2]      
Accrued interest and fees 32,700,000us-gaap_InterestReceivable   26,300,000us-gaap_InterestReceivable      
Other (500,000)us-gaap_OtherReceivables   7,000,000us-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 8,138,307,000us-gaap_NotesReceivableNet   7,147,848,000us-gaap_NotesReceivableNet      
Warehouse Facilities [Member]            
Total ending managed receivables 959,000,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= kmx_WarehouseFacilitiesReceivablesMember		   879,000,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= kmx_WarehouseFacilitiesReceivablesMember		      
Term Securitizations [Member]            
Total ending managed receivables 6,979,600,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= kmx_TermSecuritizationsMember		   6,145,500,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= kmx_TermSecuritizationsMember		      
Other Receivables [Member]            
Total ending managed receivables $ 247,900,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= kmx_OtherReceivablesMember		   $ 159,900,000us-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.