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Equities - Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2012 pools | Aug. 31, 2011 | Aug. 31, 2010 | Aug. 31, 2009
Class of Stock [Line Items] |  |  |  |
Net (loss) income | $ 1,335,719,000 | $ 1,061,028,000 | $ 535,397,000 |
Dividends and equities payable | 578,809,000 | 400,216,000 | 210,435,000 |
Patronage distribution | 969,900,000 |  |  |
Cash partonage dividends payable | 378,700,000 |  |  |
Cash patronage dividends paid | 260,666,000 | 141,513,000 | 153,894,000 |
Patronage source loss |  |  |  | 60,200,000
Patronage source earnings, percentage allocated to reserves | 10.00% | 100.00% |  |
Capital equity certificates, number of pools | 2 |  |  |
Equity redemptions, age | 70 years |  |  |
Retirement of equity certificates | 196,000,000 |  |  |
Retirements of equities | (145,722,000) | (61,193,000) | (23,135,000) |
Capital equity certificates exchanged for preferred stock |  |  | 142,000 |
Preferred stock, dividend rate, percentage | 8.00% |  | 8.00% |
Equity certificate, redemption price per share |  |  | $ 28.30 |
Preferred stock, shares outstanding | 12,272,003 |  |  |
Preferred stock, redemption amount | 306,800,000 |  |  |
Preferred stock dividends paid | (24,544,000) | (24,544,000) | (23,248,000) |
Patronage refunds |  |  |  |
Class of Stock [Line Items] |  |  |  |
Net (loss) income | 969,862,000 | 674,678,000 | 396,500,000 |
Dividends and equities payable | 378,719,000 | 260,125,000 | 138,775,000 |
Capital equity certificates exchanged for preferred stock |  |  |  |
Patronage refunds and capital stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Patronage distribution |  | 676,300,000 | 402,400,000 | 438,000,000
Capital equity certificates |  |  |  |
Class of Stock [Line Items] |  |  |  |
Net (loss) income |  |  |  |
Dividends and equities payable | 195,999,000 | 136,000,000 | 67,569,000 |
Capital equity certificates exchanged for preferred stock |  |  | $ 36,674,000 |

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