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Auto Loan Receivables (Auto Loan Receivables, Net) (Details) (USD $)
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Nov. 30, 2012
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Aug. 31, 2012
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Feb. 29, 2012
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Nov. 30, 2011
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Aug. 31, 2011
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Feb. 28, 2011
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| Non-recourse notes payable | $ 5,380,000,000 | $ 4,680,000,000 | ||||||||||||
| Total ending managed receivables | 5,583,400,000 | [1] | 4,981,800,000 | [1] | 4,823,800,000 | [1] | 4,334,600,000 | [1] | ||||||
| Accrued interest and fees | 25,800,000 | 23,100,000 | 24,300,000 | 20,900,000 | ||||||||||
| Other | (2,900,000) | (1,800,000) | 1,100,000 | 4,000,000 | ||||||||||
| Less allowance for loan losses | (54,300,000) | (49,500,000) | (43,300,000) | (41,400,000) | (36,200,000) | (38,900,000) | ||||||||
| Auto loan receivables, net | 5,552,035,000 | 4,959,847,000 | 4,807,800,000 | 4,320,600,000 | ||||||||||
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Warehouse Facilities Receivables [Member]
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| Total ending managed receivables | 876,000,000 | 553,000,000 | 876,000,000 | 943,000,000 | ||||||||||
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Term securitizations [Member]
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| Total ending managed receivables | 4,475,100,000 | 4,211,800,000 | 3,697,100,000 | 3,193,100,000 | ||||||||||
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Other receivables [Member]
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| Total ending managed receivables | $ 232,300,000 | [2] | $ 217,000,000 | [2] | $ 250,700,000 | [2] | $ 198,500,000 | [2] | ||||||
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