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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||||
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Nov. 30, 2012
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Nov. 30, 2011
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Nov. 30, 2012
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Nov. 30, 2011
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| Auto Finance Income [Line Items] | ||||||||||||
| Interest and fee income | $ 125,100,000 | $ 114,300,000 | $ 368,900,000 | $ 334,000,000 | ||||||||
| Interest expense | (23,300,000) | (25,600,000) | (72,400,000) | (80,300,000) | ||||||||
| Total interest margin | 101,800,000 | 88,700,000 | 296,500,000 | 253,700,000 | ||||||||
| Provision for loan losses | (18,100,000) | (15,100,000) | (40,200,000) | (24,900,000) | ||||||||
| Total interest margin after provision for loan losses | 83,700,000 | 73,600,000 | 256,300,000 | 228,800,000 | ||||||||
| Other income | 200,000 | 300,000 | 0 | 1,400,000 | ||||||||
| Payroll and fringe benefit expense | (5,200,000) | (5,100,000) | (15,900,000) | (15,500,000) | ||||||||
| Other direct expenses | (6,200,000) | (6,200,000) | (17,100,000) | (18,600,000) | ||||||||
| Total direct expenses | (11,400,000) | (11,300,000) | (33,000,000) | (34,100,000) | ||||||||
| CarMax Auto Finance income | 72,454,000 | 62,625,000 | [1] | 223,309,000 | 196,112,000 | [1] | ||||||
| Total average managed receivables | $ 5,477,400,000 | $ 4,770,900,000 | $ 5,266,000,000 | $ 4,585,100,000 | ||||||||
| Item as percent of total average managed receivables | 5.30% | [2] | 5.30% | [2] | 5.70% | [2] | 5.70% | [2] | ||||
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Interest And Fee Income [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | 9.10% | [2] | 9.60% | [2] | 9.30% | [2] | 9.70% | [2] | ||||
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Interest Expense [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | (1.70%) | [2] | (2.20%) | [2] | (1.80%) | [2] | (2.30%) | [2] | ||||
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Total Interest Margin [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | 7.40% | [2] | 7.40% | [2] | 7.50% | [2] | 7.40% | [2] | ||||
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Provision For Loan Losses [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | (1.30%) | [2] | (1.30%) | [2] | (1.00%) | [2] | (0.70%) | [2] | ||||
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Total Interest Margin After Provision For Loan Losses [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | 6.10% | [2] | 6.20% | [2] | 6.50% | [2] | 6.70% | [2] | ||||
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Other Gain (Loss) [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | 0.00% | [2] | 0.00% | [2] | 0.00% | [2] | 0.00% | [2] | ||||
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Payroll And Fringe Benefit Expense [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | (0.40%) | [2] | (0.40%) | [2] | (0.40%) | [2] | (0.50%) | [2] | ||||
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Other Direct Expenses [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | (0.50%) | [2] | (0.50%) | [2] | (0.40%) | [2] | (0.50%) | [2] | ||||
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Total Direct Expenses [Member]
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| Auto Finance Income [Line Items] | ||||||||||||
| Item as percent of total average managed receivables | (0.80%) | [2] | (0.90%) | [2] | (0.80%) | [2] | (1.00%) | [2] | ||||
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