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Equities - Narrative (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Aug. 31, 2014 | Aug. 31, 2013 pools | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2013 Non-qualified Equity Certificates [Member] | Aug. 31, 2013 Patronage refunds | Aug. 31, 2012 Patronage refunds | Aug. 31, 2011 Patronage refunds | Aug. 31, 2012 Patronage refunds and capital stock | Aug. 31, 2011 Patronage refunds and capital stock | Aug. 31, 2010 Patronage refunds and capital stock | Aug. 31, 2013 Capital equity certificates | Aug. 31, 2012 Capital equity certificates | Aug. 31, 2011 Capital equity certificates | Aug. 31, 2013 8% Preferred Stock [Member] | Aug. 31, 2013 Class B Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 996,328,000 | $ 1,335,719,000 | $ 1,061,028,000 |  | $ 841,386,000 | $ 969,862,000 | $ 674,678,000 |  |  |  |  |  |  |  |
Dividends and equities payable |  | 390,153,000 | 578,809,000 | 400,216,000 |  | 284,769,000 | 378,719,000 | 260,125,000 |  |  |  | 101,293,000 | 195,999,000 | 136,000,000 |  |
Patronage distribution |  | 711,900,000 |  |  | 129,500,000 |  |  |  | 976,000,000 | 676,300,000 | 402,400,000 |  |  |  |  |
Cash partonage dividends payable |  | 284,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash patronage dividends paid |  | 380,947,000 | 260,666,000 | 141,513,000 |  |  |  |  |  |  |  |  |  |  |  |
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 | 101,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirements of equities |  | (193,413,000) | (145,722,000) | (61,193,000) |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 7.875%
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,272,003 | 11,319,175
Preferred stock, redemption amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 306,800,000 | 283,000,000
Preferred stock dividends paid |  | $ (24,544,000) | $ (24,544,000) | $ (24,544,000) |  |  |  |  |  |  |  |  |  |  |  |

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