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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $)
3 Months Ended 9 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Auto Finance Income [Line Items]        
Provision for loan losses     $ 24,900,000  
CarMax Auto Finance income 62,625,000 55,745,000 196,112,000 165,844,000
Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Interest and fee income 114,300,000 106,800,000 334,000,000 314,100,000
Interest expense (25,600,000) (33,000,000) (80,300,000) (103,400,000)
Total interest margin 88,700,000 73,800,000 253,700,000 210,700,000
Provision for loan losses (15,100,000) (8,600,000) (24,900,000) (18,500,000)
Total interest margin after provision for loan losses 73,600,000 65,200,000 228,800,000 192,200,000
Servicing fee income 0 0 0 900,000
Interest income on retained interest in securitized receivables 0 0 0 1,600,000
Other gain 300,000 1,800,000 1,400,000 4,300,000
Total other income 300,000 1,800,000 1,400,000 6,800,000
Payroll and fringe benefit expense (5,100,000) (5,100,000) (15,500,000) (15,400,000)
Other direct expenses (6,200,000) (6,200,000) (18,600,000) (17,800,000)
Total direct expenses (11,300,000) (11,300,000) (34,100,000) (33,200,000)
CarMax Auto Finance income 62,600,000 55,700,000 196,100,000 165,800,000
Total average managed receivables, principal only $ 4,770,900,000 $ 4,285,300,000 $ 4,585,100,000 $ 4,204,600,000
Interest And Fee Income [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 9.60% [1] 10.00% [1] 9.70% [1] 10.00% [1]
Interest Expense [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only (2.20%) [1] (3.10%) [1] (2.30%) [1] (3.30%) [1]
Total Interest Margin [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 7.40% [1] 6.90% [1] 7.40% [1] 6.70% [1]
Provision For Loan Losses [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only (1.30%) [1] (0.80%) [1] (0.70%) [1] (0.60%) [1]
Total Interest Margin After Provision For Loan Losses [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 6.20% [1] 6.10% [1] 6.70% [1] 6.10% [1]
Servicing Fee Income [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 0.00% [1] 0.00% [1] 0.00% [1] 0.00% [1]
Interest Income On Retained Interest In Securitized Receivables [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 0.00% [1] 0.00% [1] 0.00% [1] 0.10% [1]
Other Gain (Loss) [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 0.00% [1] 0.20% [1] 0.00% [1] 0.10% [1]
Total Other Income (Loss) [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 0.00% [1] 0.20% [1] 0.00% [1] 0.20% [1]
Payroll And Fringe Benefit Expense [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only (0.40%) [1] (0.50%) [1] (0.50%) [1] (0.50%) [1]
Other Direct Expenses [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only (0.50%) [1] (0.60%) [1] (0.50%) [1] (0.60%) [1]
Total Direct Expenses [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only (0.90%) [1] (1.10%) [1] (1.00%) [1] (1.10%) [1]
CarMax Auto Finance Income [Member] | Net Income Loss From Financing [Member]
       
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables, principal only 5.30% [1] 5.20% [1] 5.70% [1] 5.30% [1]
[1] Annualized percent of total average managed receivables, principal only.