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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
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Aug. 31, 2013
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Aug. 31, 2012
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Aug. 31, 2013
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Aug. 31, 2012
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| Auto Finance Income [Line Items] | ||||||||||
| Interest and fee income | $ 137,200,000 | $ 123,500,000 | $ 270,700,000 | $ 243,800,000 | ||||||
| Interest expense | (22,600,000) | (23,900,000) | (45,400,000) | (49,000,000) | ||||||
| Total interest margin | 114,600,000 | 99,600,000 | 225,300,000 | 194,800,000 | ||||||
| Provision for loan losses | (18,000,000) | (12,900,000) | (29,300,000) | (22,100,000) | ||||||
| Total interest margin after provision for loan losses | 96,600,000 | 86,700,000 | 196,000,000 | 172,700,000 | ||||||
| Other income (loss) | 100,000 | (200,000) | 100,000 | (200,000) | ||||||
| Payroll and fringe benefit expense | (5,600,000) | (5,400,000) | (11,100,000) | (10,700,000) | ||||||
| Other direct expenses | (6,700,000) | (5,400,000) | (13,600,000) | (10,900,000) | ||||||
| Total direct expenses | (12,300,000) | (10,800,000) | (24,700,000) | (21,600,000) | ||||||
| CarMax Auto Finance income | 84,422,000 | 75,676,000 | 171,441,000 | 150,855,000 | ||||||
| Total average managed receivables | $ 6,516,300,000 | $ 5,245,400,000 | $ 6,334,400,000 | $ 5,160,300,000 | ||||||
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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 | 8.40% | [1] | 9.40% | [1] | 8.50% | [1] | 9.40% | [1] | ||
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Interest Expense [Member]
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| Auto Finance Income [Line Items] | ||||||||||
| Item as percent of total average managed receivables | (1.40%) | [1] | (1.80%) | [1] | (1.40%) | [1] | (1.90%) | [1] | ||
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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 | 7.00% | [1] | 7.60% | [1] | 7.10% | [1] | 7.50% | [1] | ||
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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 | (1.10%) | [1] | (1.00%) | [1] | (0.90%) | [1] | (0.90%) | [1] | ||
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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 | 5.90% | [1] | 6.60% | [1] | 6.20% | [1] | 6.70% | [1] | ||
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Other Income Loss [Member]
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| Auto Finance Income [Line Items] | ||||||||||
| Item as percent of total average managed receivables | 0.00% | [1] | 0.00% | [1] | 0.00% | [1] | 0.00% | [1] | ||
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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 | (0.30%) | [1] | (0.40%) | [1] | (0.40%) | [1] | (0.40%) | [1] | ||
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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 | (0.40%) | [1] | (0.40%) | [1] | (0.40%) | [1] | (0.40%) | [1] | ||
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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 | (0.70%) | [1] | (0.80%) | [1] | (0.80%) | [1] | (0.80%) | [1] | ||
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CarMax Auto Finance Income [Member]
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| Auto Finance Income [Line Items] | ||||||||||
| Item as percent of total average managed receivables | 5.20% | [1] | 5.80% | [1] | 5.40% | [1] | 5.80% | [1] | ||
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