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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
May 31, 2018
May 31, 2017
Auto Finance Income [Line Items]    
Interest and fee income $ 232,300 $ 206,700
Interest expense (63,800) (49,000)
Total interest margin 168,500 157,700
Provision for loan losses (30,900) (28,600)
Total interest margin after provision for loan losses 137,600 129,100
Payroll and fringe benefit expense (9,600) (8,500)
Other direct expenses (12,400) (11,200)
Total direct expenses (22,000) (19,700)
CarMax Auto Finance income 115,593 109,363
Total average managed receivables $ 11,775,400 $ 10,829,500
Interest and fee income, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables 7.90% 7.60%
Interest expense, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables (2.20%) (1.80%)
Total interest margin, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables 5.70% 5.80%
Provision for loan losses, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables (1.00%) (1.10%)
Total interest margin after provision for loan losses, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables 4.70% 4.80%
Payroll and fringe benefit expense, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables (0.30%) (0.30%)
Other direct expenses, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables (0.40%) (0.40%)
Total direct expenses, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables (0.70%) (0.70%)
CarMax Auto Finance income, percent    
Auto Finance Income [Line Items]    
Item as percent of total average managed receivables 3.90% 4.00%