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Equities - Narrative (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 3 Months Ended |  | 3 Months Ended
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Aug. 31, 2014 pools | Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2014 Non-qualified Equity Certificates [Member] | Aug. 31, 2013 Non-qualified Equity Certificates [Member] | Aug. 31, 2012 Non-qualified Equity Certificates [Member] | Aug. 31, 2013 Patronage refunds and capital stock | Aug. 31, 2012 Patronage refunds and capital stock | Aug. 31, 2011 Patronage refunds and capital stock | Aug. 31, 2014 Cash Distribution [Member] | Aug. 31, 2013 Cash Distribution [Member] | Aug. 31, 2012 Cash Distribution [Member] | Aug. 31, 2014 Capital Equity Certificates | Aug. 31, 2013 Capital Equity Certificates | Aug. 31, 2012 Capital Equity Certificates | Aug. 31, 2014 8% Preferred Stock [Member] | Sep. 30, 2013 Class B, Series 1 Preferred Stock [Member] | Aug. 31, 2014 Class B, Series 1 Preferred Stock [Member] | Aug. 21, 2014 Class B, Series 1 Preferred Stock [Member] | Sep. 13, 2013 Class B, Series 1 Preferred Stock [Member] | Mar. 31, 2014 Class B, Series 2 Preferred Stock [Member] | Aug. 31, 2014 Class B, Series 2 Preferred Stock [Member] | Jun. 30, 2014 Class B Preferred Stock [Member] | Aug. 31, 2014 London Interbank Offered Rate (LIBOR) [Member] Class B, Series 2 Preferred Stock [Member] | Aug. 31, 2014 Maximum Class B, Series 2 Preferred Stock [Member] | Nov. 30, 2014 Subsequent Event [Member] Class B, Series 3 Preferred Stock [Member] | Sep. 30, 2014 Subsequent Event [Member] Class B, Series 3 Preferred Stock [Member] | Nov. 30, 2014 Subsequent Event [Member] London Interbank Offered Rate (LIBOR) [Member] Class B, Series 3 Preferred Stock [Member] | Nov. 30, 2014 Subsequent Event [Member] Maximum Class B, Series 3 Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patronage Refunds, payable in next fiscal year | $ 662,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patronage Refunds | 286,789,000 | 380,947,000 | 260,666,000 | (131,661,000) |  |  | 841,100,000 | 976,000,000 | 676,300,000 | 286,800,000 | 380,900,000 | 260,700,000 | (422,670,000) | (595,022,000) | (415,584,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patronage distribution |  |  |  | 148,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash partonage dividends payable | 264,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patronage source earnings, percentage allocated to reserves | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital equity certificates, number of pools | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity redemptions, age | 70 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated payments for redemptions of equities | (130,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirements of equities | (99,609,000) | (193,413,000) | (145,722,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  | 7.875% |  |  |  | 7.10% |  |  |  | 6.75% |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,272,003 |  | 18,071,363 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 306,800,000 |  | 451,800,000 |  |  |  | 420,000,000 |  |  |  |  | 492,500,000 |  |
Proceeds from issuance of preferred stock, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 273,300,000 |  |  |  | 406,300,000 |  |  |  |  | 477,000,000 |  |  |
Preferred stock dividends paid | (50,761,000) | (24,544,000) | (24,544,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, Value registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,752,188 | 11,319,175 | 16,800,000 |  |  |  |  |  | 19,700,000 |  |
Preferred Stock, Basis Spread on Dividends, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.298% | 8.00% |  |  | 4.155% | 8.00%
Patron equities to be redeemed, value |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Price per Share | $ 29.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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