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Equities - Narrative (Details) | 12 Months Ended
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Aug. 31, 2020 USD ($) pools | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |
Estimated patronage refunds | $ (30,000,000) | $ (90,000,000) | $ (75,000,000) |
Cash patronage dividends payable | $ (90,115,000) | (75,776,000) | 0 |
Patronage source earnings, percentage allocated to reserves | 10.00% |  |  |
Capital equity certificates, number of pools | pools | 2 |  |  |
Equity redemptions, age | 70 years |  |  |
Redemptions of equities | $ 96,438,000 | 85,540,000 | 8,847,000 |
Preferred stock dividends paid | (168,668,000) | (168,668,000) | (168,668,000) |
Reclassifications |  |  |  |
Estimated Cash Patronage Dividends Payable | 30,000,000.0 |  |  |
futurePaymentsForRepurchaseOfOtherEquity | (33,000,000.0) |  |  |
Class B, Series 1 Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Redemption Amount | 536,500,000 |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Class of Stock [Line Items] |  |  |  |
Reclassifications | 0 | (4,706,000) | (26,992,000) |
Capital Reserves |  |  |  |
Class of Stock [Line Items] |  |  |  |
Estimated patronage refunds | 241,970,000 | 562,398,000 | 420,330,000 |
Nonqualified Equity Certificates |  |  |  |
Class of Stock [Line Items] |  |  |  |
Estimated patronage refunds | 211,970,000 | 472,398,000 | 345,330,000 |
Qualified Equity Certificates |  |  |  |
Class of Stock [Line Items] |  |  |  |
Estimated patronage refunds | $ 0 |  |  |
Patronage refunds and capital stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
PatronageRefunds |  | 564,500,000 | 428,800,000 | $ 128,800,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Reclassifications |  | $ 983,000 | $ (1,468,000) |

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