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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $)
 3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Auto Finance Income [Line Items]        
Interest and fee income $ 150,700,000 $ 137,200,000 $ 297,600,000 $ 270,700,000
Interest expense (23,900,000) (22,600,000) (47,000,000) (45,400,000)
Total interest margin 126,800,000 114,600,000 250,600,000 225,300,000
Provision for loan losses (20,400,000) (18,000,000) (36,200,000) (29,300,000)
Total interest margin after provision for loan losses 106,400,000 96,600,000 214,400,000 196,000,000
Other income 0 100,000 0 100,000
Payroll and fringe benefit expense (6,300,000) (5,600,000) (12,500,000) (11,100,000)
Other direct expenses (7,500,000) (6,700,000) (14,700,000) (13,600,000)
Total direct expenses (13,800,000) (12,300,000) (27,200,000) (24,700,000)
CarMax Auto Finance income 92,574,000 84,422,000 187,189,000 171,441,000
Average Balance of Loans Held in Porfolio $ 7,724,500,000 $ 6,516,300,000 $ 7,557,300,000 $ 6,334,400,000
Interest And Fee Income [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 7.80% [1] 8.40% [1] 7.90% [1] 8.50% [1]
Interest Expense [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (1.20%) [1] (1.40%) [1] (1.20%) [1] (1.40%) [1]
Total Interest Margin [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 6.60% [1] 7.00% [1] 6.60% [1] 7.10% [1]
Provision For Loan Losses [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (1.10%) [1] (1.10%) [1] (1.00%) [1] (0.90%) [1]
Total Interest Margin After Provision For Loan Losses [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 5.50% [1] 5.90% [1] 5.70% [1] 6.20% [1]
Other Income [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 0.00% [1] 0.00% [1] 0.00% [1] 0.00% [1]
Payroll And Fringe Benefit Expense [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.30%) [1] (0.30%) [1] (0.30%) [1] (0.40%) [1]
Other Direct Expenses [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.40%) [1] (0.40%) [1] (0.40%) [1] (0.40%) [1]
Total Direct Expenses [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.70%) [1] (0.70%) [1] (0.70%) [1] (0.80%) [1]
CAF Income [Member]
        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 4.80% [1] 5.20% [1] 5.00% [1] 5.40% [1]
[1] Annualized percentage of total average managed receivables.