v3.24.1.u1
CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 29, 2024
Feb. 28, 2023
Feb. 28, 2022
Auto Finance Income [Line Items]      
Interest and fee income $ 1,677,400 $ 1,441,500 $ 1,296,800
Interest expense (638,700) (310,300) (228,800)
Total interest margin 1,038,700 1,131,200 1,068,000
Provision for loan losses (310,500) (317,000) (141,700)
Total interest margin after provision for loan losses 728,200 814,200 926,300
Payroll and fringe benefit expense (66,500) (62,800) (50,500)
Other Depreciation and Amortization (16,500) (15,500) (6,600)
Other direct expenses (76,900) (72,400) (67,700)
Total direct expenses (159,900) (150,800) (124,800)
CARMAX AUTO FINANCE INCOME  568,271 663,404 801,507
Total average managed receivables $ 17,313,200 $ 16,304,300 $ 14,934,000
Interest And Fee Income, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 9.70% 8.80% 8.70%
Interest Expense, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (3.70%) (1.90%) (1.50%)
Total Interest Margin, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 6.00% 6.90% 7.20%
Provision For Loan Losses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (1.80%) (1.90%) (0.90%)
Total Interest Margin After Provision For Loan Losses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 4.20% 5.00% 6.20%
Payroll And Fringe Benefit Expense, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.40%) (0.40%) (0.30%)
CAF Depreciation and Amortization      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.10%) (0.10%) 0.00%
Other Direct Expenses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.40%) (0.40%) (0.50%)
Total Direct Expenses, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables (0.90%) (0.90%) (0.80%)
CAF Income, Percent      
Auto Finance Income [Line Items]      
Item as percent of total average managed receivables 3.30% 4.10% 5.40%