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Equities - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | May 31, 2016 USD ($) $ / shares | Aug. 31, 2016 USD ($) pools $ / shares shares | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) $ / shares | Aug. 31, 2013 USD ($) | Mar. 31, 2016 USD ($) shares | Aug. 30, 2014 shares | Aug. 25, 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 |  |  | $ 279,000 |  |  |  |  |  |  |
Distribution of patronage refunds |  |  | 251,740 | $ 271,226 | $ 286,789 |  |  |  |  |
Cash partonage dividends payable |  |  | $ 111,600 | $ 251,700 | $ 271,200 | $ 286,800 |  |  |  |
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 |  |  |  |  |  |  |
Retirements of equities |  |  | $ (23,911) | $ (128,907) | $ (99,609) |  |  |  |  |
Preferred stock dividends paid |  |  | (163,324) | (133,710) | $ (50,761) |  |  |  |  |
Preferred stock, Value available for issuance |  |  | 990,000 |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Price per Share | $ / shares |  | $ 28.50 |  |  | $ 29.62 |  |  |  |  |
Non-qualified Equity Certificates [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution of patronage refunds |  |  |  | 147,710 | $ 131,661 |  |  |  |  |
Patronage refunds and capital stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution of patronage refunds |  |  |  | 627,200 | 821,500 | $ 841,100 |  |  |  |
Capital Equity Certificates |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution of patronage refunds |  |  | $ 375,506 | $ 402,560 | 422,670 |  |  |  |  |
Stock Redeemed or Called During Period, Value |  | $ 76,800 |  |  | 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 |  |  |  | $ 67,300 |  |  |
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 |  |  | 20,764,558 |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  | $ 519,100 |  |  |  |  |  |  |
Proceeds from issuance of preferred stock, net of issuance costs |  |  | $ 549,400 |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  |  |  |  |  | 2,693,195 | 6,752,188 | 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% |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring |  |  | $ 3,700 |  |  |  |  |  |  |
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring |  |  |  |  | $ 13,500 |  |  |  |  |
Fiscal Year [Domain] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated payments for redemptions of equities |  |  | 40,000 |  |  |  |  |  |  |
Fiscal Year 2015 [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated payments for redemptions of equities |  |  | $ 18,600 |  |  |  |  |  |  |

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