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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Auto Finance Income [Line Items]        
Interest and fee income $ 448,000 $ 469,200 $ 1,423,200 $ 1,386,200
Interest expense (188,300) (193,200) (585,000) (569,200)
Total interest margin 259,700 276,000 838,200 817,000
Provision for loan losses (73,400) (72,600) (317,335) (266,406)
Total interest margin after provision for loan losses 186,300 203,400 520,900 550,600
Payroll and fringe benefit expense (20,500) (19,000) (61,000) (56,600)
Other Depreciation and Amortization (4,500) (4,300) (13,200) (12,800)
Other direct expenses (18,600) (20,200) (59,700) (58,800)
Total direct expenses (43,600) (43,500) (133,900) (128,200)
Gain (Loss) on Sale of Loans and Leases 27,000 0 27,000 0
CarMax Auto Finance income 174,738 159,885 419,026 422,435
Servicing income $ 5,000 $ 0 $ 5,000 $ 0