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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Auto Finance Income [Line Items]      
Interest and fee income $ 1,142,000 $ 1,104,100 $ 972,900
Interest expense (314,100) (358,100) (289,300)
Total interest margin 827,900 746,000 683,600
Provision for loan losses (160,700) (185,700) (153,800)
Total interest margin after provision for loan losses 667,200 560,300 529,800
Total other expense (2,200) 0 (400)
Payroll and fringe benefit expense (46,000) (42,300) (38,300)
Other direct expenses (56,200) (62,000) (52,400)
Total direct expenses (102,200) (104,300) (90,700)
CarMax Auto Finance income 562,810 456,030 438,690
Total average managed receivables $ 13,463,300 $ 13,105,100 $ 12,150,200
Interest And Fee Income, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 8.50% 8.40% 8.00%
Interest Expense, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (2.30%) (2.70%) (2.40%)
Total Interest Margin, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 6.10% 5.70% 5.60%
Provision For Loan Losses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (1.20%) (1.40%) (1.30%)
Total Interest Margin After Provision For Loan Losses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 5.00% 4.30% 4.40%
Other Income (Expense), Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 0.00% 0.00% 0.00%
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%)
Other Direct Expenses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.40%) (0.50%) (0.40%)
Total Direct Expenses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.80%) (0.80%) (0.70%)
CAF Income, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 4.20% 3.50% 3.60%