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Equities - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 30, 2017 USD ($) $ / shares shares | Aug. 31, 2018 USD ($) pools | May 31, 2016 USD ($) $ / shares | Aug. 31, 2018 USD ($) pools | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Aug. 31, 2014 USD ($) | Mar. 31, 2016 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated patronage refunds |  |  |  | $ 75,000,000 |  | $ 103,879,000 |  |
Cash patronage dividends payable |  |  |  | $ 75,000,000 | $ 0 | 103,900,000 | $ 251,700,000 |
Distribution of patronage refunds |  |  |  |  | $ 103,879,000 | $ 251,740,000 |  |
Patronage source earnings, percentage allocated to reserves |  |  |  | 10.00% | 10.00% | 10.00% |  |
Capital equity certificates, number of pools | pools |  | 2 |  | 2 |  |  |  |
Equity redemptions, age |  |  |  | 70 years |  |  |  |
Redemptions of equities |  |  |  | $ (8,847,000) | $ (35,268,000) | $ (23,911,000) |  |
Stock Redeemed or Called During Period, Price per Share | $ / shares | $ 28.74 |  | $ 28.50 |  |  |  |  |
Preferred stock dividends paid |  |  |  | (168,668,000) | (167,642,000) | (163,324,000) |  |
Reclassification of tax effects to retained earnings |  |  |  | 0 |  |  |  |
Class B, Series 1 Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares | 695,390 |  |  |  |  |  |  | 2,693,195
Preferred Stock, Redemption Amount |  | $ 536,500,000 |  | 536,500,000 |  |  |  |
Fiscal Year 2017 [Domain] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated payments for redemptions of equities |  |  |  | 75,000,000 |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Reclassification of tax effects to retained earnings |  | (27,000,000) |  | (26,992,000) |  |  |  |
Capital Reserves |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated patronage refunds |  |  |  | 420,330,000 | 126,333,000 | 257,458,000 |  |
Distribution of patronage refunds |  |  |  | 128,831,000 | 257,468,000 | 627,246,000 |  |
Reclassification of tax effects to retained earnings |  | $ 27,000,000 |  | 26,992,000 |  |  |  |
Nonqualified Equity Certificates |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated patronage refunds |  |  |  | (345,330,000) | (126,333,000) |  |  |
Distribution of patronage refunds |  |  |  | (128,831,000) |  |  |  |
Qualified Equity Certificates |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated patronage refunds |  |  |  | 0 |  |  |  |
Patronage refunds and capital stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distribution of patronage refunds |  |  |  |  | 128,800,000 | 257,500,000 | $ 627,200,000 |
Capital Equity Certificates |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Estimated patronage refunds |  |  |  |  |  | (153,579,000) |  |
Distribution of patronage refunds |  |  |  |  | $ (153,589,000) | (375,506,000) |  |
Stock Redeemed or Called During Period, Value | $ 20,000,000 |  | $ 76,800,000 |  |  |  |  |
Preferred Stock, Redemption Amount | $ 17,400,000 |  |  |  |  |  |  | $ 67,300,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Reclassification of tax effects to retained earnings |  |  |  | $ (1,468,000) |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Loss reclassified from accumulated other comprehensive loss |  |  |  |  |  | $ 3,700,000 |  |

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