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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, 2026
Aug. 31, 2025
Aug. 31, 2026
Aug. 31, 2025
Feb. 28, 2026
Auto Finance Income [Line Items]          
Interest and fee income $ 456,200 $ 489,800 $ 917,100 $ 975,200  
Interest expense (182,300) (199,200) (366,500) (396,700)  
Total interest margin 273,900 290,600 550,600 578,500  
Provision for loan losses (113,400) (142,200) (208,975) (243,904)  
Total interest margin after provision for loan losses 160,500 148,400 341,600 334,600  
Payroll and fringe benefit expense (18,600) (20,500) (36,800) (40,500)  
Other Depreciation and Amortization (4,500) (4,400) (9,000) (8,700)  
Other direct expenses (24,500) (20,900) (46,900) (41,100)  
Total direct expenses (47,600) (45,800) (92,700) (90,300)  
Gain (Loss) on Sale of Loans and Leases 16,600 0 16,600 0  
CarMax Auto Finance income 135,560 102,638 275,801 244,288  
Servicing income 6,100 $ 0 10,300 $ 0  
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance 106,541   $ 106,541   $ 100,491
Financing Receivable, Sale $ 596,000