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Auto Loan Receivables (Auto Loan Receivables, Net) (Details) (USD $)
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Aug. 31, 2013
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May 31, 2013
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Feb. 28, 2013
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Aug. 31, 2012
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May 31, 2012
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Feb. 29, 2012
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| Non-recourse notes payable | $ 6,730,000,000 | $ 5,860,000,000 | ||||||||||
| Total ending managed receivables | 6,683,100,000 | [1],[2] | 5,933,300,000 | [1],[2] | ||||||||
| Accrued interest and fees | 28,800,000 | 24,900,000 | ||||||||||
| Other | 20,000,000 | (5,000,000) | ||||||||||
| Less allowance for loan losses | (65,900,000) | (60,900,000) | (57,300,000) | (49,500,000) | (46,600,000) | (43,300,000) | ||||||
| Auto loan receivables, net | 6,665,985,000 | 5,895,918,000 | ||||||||||
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Warehouse Facilities Receivables [Member]
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| Total ending managed receivables | 947,000,000 | 792,000,000 | ||||||||||
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Term securitizations [Member]
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| Total ending managed receivables | 5,565,300,000 | 4,989,700,000 | ||||||||||
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Other receivables [Member]
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| Total ending managed receivables | $ 170,800,000 | $ 151,600,000 | ||||||||||
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