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Equities - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Aug. 31, 2015 USD ($) pools $ / shares shares | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Aug. 31, 2011 USD ($) | Aug. 30, 2014 shares | Sep. 26, 2013 shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  | $ 25.00 |  |  |  |  |
Patronage Refunds, payable in next fiscal year |  | $ 625,400 |  |  |  |  |
Patronage Refunds |  | 271,226 | $ 286,789 | $ 380,947 |  |  |
Cash partonage dividends payable |  | $ 250,200 |  |  |  |  |
Patronage source earnings, percentage allocated to reserves |  | 10.00% | 10.00% | 10.00% |  |  |
Capital equity certificates, number of pools | pools |  | 2 |  |  |  |  |
Equity redemptions, age |  | 70 years |  |  |  |  |
Estimated payments for redemptions of equities |  | $ (107,300) |  |  |  |  |
Retirements of equities |  | (128,907) | $ (99,609) | $ (193,413) |  |  |
Preferred stock dividends paid |  | (133,710) | (50,761) | $ (24,544) |  |  |
Preferred stock, Value available for issuance |  | $ 990,000 |  |  |  |  |
Stock Redeemed or Called During Period, Price per Share | $ / shares |  | $ 29.62 |  |  |  |  |
Non-qualified Equity Certificates [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Patronage Refunds |  | $ (147,710) | (131,661) |  |  |  |
Patronage refunds and capital stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Patronage Refunds |  |  | 821,500 | $ 841,100 | $ 976,000 |  |
Cash Distribution [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Patronage Refunds |  | 271,200 | 286,800 | 380,900 |  |  |
Capital Equity Certificates |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Patronage Refunds |  | $ (402,560) | (422,670) | $ (595,022) |  |  |
Patron equities to be redeemed, value |  |  | $ 200,000 |  |  |  |
8% Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 8.00% |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 12,272,003 |  |  |  |  |
Preferred Stock, Redemption Amount |  | $ 306,800 |  |  |  |  |
Proceeds from issuance of preferred stock, net of issuance costs |  | $ 311,200 |  |  |  |  |
Class B, Series 1 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 7.875% |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 18,071,363 |  |  |  |  |
Preferred Stock, Redemption Amount |  | $ 451,800 |  |  |  |  |
Proceeds from issuance of preferred stock, net of issuance costs |  | $ 472,800 |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  |  |  |  | 6,752,188 | 11,319,175
Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 6.75% |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 19,700,000 |  |  |  |  |
Preferred Stock, Redemption Amount |  | $ 492,500 |  |  |  |  |
Proceeds from issuance of preferred stock, net of issuance costs |  | $ 476,700 |  |  |  |  |
Class B, Series 2 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 7.10% |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 16,800,000 |  |  |  |  |
Preferred Stock, Redemption Amount |  | $ 420,000 |  |  |  |  |
Proceeds from issuance of preferred stock, net of issuance costs |  | $ 406,200 |  |  |  |  |
Class B Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, Value registered | $ 2,000,000 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividends, Percent |  | 4.155% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 2 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividends, Percent |  | 4.298% |  |  |  |  |
Maximum | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividends, Percent |  | 8.00% |  |  |  |  |
Maximum | Class B, Series 2 Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Basis Spread on Dividends, Percent |  | 8.00% |  |  |  |  |

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