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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, 2024
Aug. 31, 2023
Aug. 31, 2024
Aug. 31, 2023
Auto Finance Income [Line Items]        
Interest and fee income $ 464,500 $ 416,900 $ 917,000 $ 817,400
Interest expense (193,700) (152,000) (376,000) (294,600)
Total interest margin 270,800 264,900 541,000 522,800
Provision for loan losses (112,600) (89,800) (193,800) (170,700)
Total interest margin after provision for loan losses 158,200 175,100 347,200 352,100
Payroll and fringe benefit expense (19,000) (16,800) (37,600) (33,400)
Other Depreciation and Amortization (4,300) (4,100) (8,500) (8,200)
Other direct expenses (19,300) (19,300) (38,500) (38,200)
Total direct expenses (42,600) (40,200) (84,600) (79,800)
CarMax Auto Finance income 115,580 134,987 262,550 272,345
Total average managed receivables $ 17,728,800 $ 17,315,600 $ 17,640,000 $ 17,159,500
Interest and fee income, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 10.50% 9.60% 10.40% 9.50%
Interest expense, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (4.40%) (3.50%) (4.30%) (3.40%)
Total interest margin, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 6.10% 6.10% 6.10% 6.10%
Provision for loan losses, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (2.50%) (2.10%) (2.20%) (2.00%)
Total interest margin after provision for loan losses, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 3.60% 4.00% 3.90% 4.10%
Payroll and fringe benefit expense, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.40%) (0.40%) (0.40%) (0.40%)
Other Depreciation and Amortization        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables (0.10%) (0.10%) (0.10%) (0.10%)
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 (1.00%) (0.90%) (1.00%) (0.90%)
CarMax Auto Finance income, percent        
Auto Finance Income [Line Items]        
Item as percent of total average managed receivables 2.60% 3.10% 3.00% 3.20%