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Investments - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2016 USD ($) | Aug. 31, 2020 USD ($) T | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Feb. 01, 2096 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity (income) loss from investments, net of distributions received |  | $ (186,715,000) | $ (236,755,000) | $ (153,515,000) |
Investment Company, Distributable Earnings |  | $ 383,000,000.0 |  |  |
CF Industries Nitrogen |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Amount invested in equity method investment | $ 2,700,000,000 |  |  |  |
Supply agreement, term | 80 years |  |  |  |
Maximum annual granular urea eligible for purchases | T |  | 1,100,000 |  |  |
Maximum annual UAN eligible for purchases | T |  | 580,000 |  |  |
Equity method investments |  | $ 2,662,618,000 | 2,708,942,000 |  |
Cash Distribution from Equity Method |  | $ 174,300,000 | 186,500,000 |  |
CF Industries Nitrogen | Forecast |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  |  |  |  | $ 0
CF Industries Nitrogen | Nitrogen Production |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  | 10.00% |  |  |
Ventura Foods |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  | $ 381,351,000 | 374,516,000 |  |
Ventura Foods | Ag |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |
Ardent Mills |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  | 12.00% |  |  |
Equity method investments |  | $ 208,927,000 | $ 209,027,000 |  |

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