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Auto Loan Receivables (Auto Loan Receivables, Net) (Details) (USD $)
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Nov. 30, 2011
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Feb. 28, 2011
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Nov. 30, 2010
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Feb. 28, 2010
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| Auto Loan Receivables [Abstract] | ||||||||||||
| Warehouse facilities | $ 876,000,000 | [1] | $ 943,000,000 | [1] | $ 542,000,000 | [1] | $ 331,000,000 | [1] | ||||
| Term securitizations | 3,697,100,000 | [1] | 3,193,100,000 | [1] | 3,599,900,000 | [1] | 3,615,600,000 | [1] | ||||
| Other receivables | 250,700,000 | [2] | 198,500,000 | [2] | 146,200,000 | [2] | 166,100,000 | [2] | ||||
| Total ending managed receivables | 4,823,800,000 | 4,334,600,000 | 4,288,100,000 | 4,112,700,000 | ||||||||
| Accrued interest and fees | 24,300,000 | 20,900,000 | 23,200,000 | |||||||||
| Other | 1,100,000 | 4,000,000 | 5,500,000 | |||||||||
| Less allowance for loan losses | (41,400,000) | (38,900,000) | (42,200,000) | |||||||||
| Auto loan receivables, net | $ 4,807,804,000 | $ 4,320,575,000 | $ 4,274,600,000 | |||||||||
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