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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Auto Finance Income [Line Items]        
Interest and fee income $ 213,600 $ 190,200 $ 420,300 $ 374,300
Interest expense (52,200) (41,800) (101,200) (81,200)
Total interest margin 161,400 148,400 319,100 293,100
Provision for loan losses (32,900) (35,700) (61,500) (62,300)
Total interest margin after provision for loan losses 128,500 112,700 257,600 230,800
Payroll and fringe benefit expense (8,800) (7,700) (17,300) (15,400)
Other direct expenses (11,800) (9,000) (23,000) (18,700)
Total direct expenses (20,600) (16,700) (40,300) (34,100)
CarMax Auto Finance income 107,936 95,969 217,299 196,727
Total average managed receivables $ 11,112,000 $ 10,049,800 $ 10,970,800 $ 9,897,400
Interest and fee income, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 7.70% 7.60% 7.70% 7.60%
Interest expense, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (1.90%) (1.70%) (1.80%) (1.60%)
Total interest margin, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 5.80% 5.90% 5.80% 5.90%
Provision for loan losses, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (1.20%) (1.40%) 1.10% (1.30%)
Total interest margin after provision for loan losses, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 4.60% 4.50% 4.70% 4.70%
Payroll and fringe benefit expense, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.30%) (0.30%) (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%) (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%) (0.70%) (0.70%)
CarMax Auto Finance income, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 3.90% 3.80% 4.00% 4.00%