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Investments - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2020 USD ($) | May 31, 2019 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($) | Aug. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity (income) loss from investments | $ (51,114) | $ (65,170) | $ (135,174) | $ (173,394) |
Cost Method Investments | 123,311 |  | 123,311 |  | $ 124,264
Investments | $ 3,666,959 |  | 3,666,959 |  | 3,683,996
CF Nitrogen LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | $ 2,700,000 |  |
Ownership percentage | 10.00% |  | 10.00% |  |
Equity Method Investments | $ 2,724,668 |  | $ 2,724,668 |  | 2,708,942
Ventura Foods, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investments | 364,726 |  | 364,726 |  | 374,516
Ardent Mills LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investments | 206,476 |  | 206,476 |  | $ 209,027
Nitrogen Production [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity (income) loss from investments | $ (41,264) | (41,959) | $ (104,021) | (118,416) |
Foods [Member] | Ventura Foods, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 50.00% |  | 50.00% |  |
Corporate and Other |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity (income) loss from investments | $ (582) | (18,439) | $ (29,741) | (50,475) |
Corporate and Other | Ardent Mills LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 12.00% |  | 12.00% |  |
Number of parent companies | 3 |  | 3 |  |
Ag |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity (income) loss from investments | $ (7,999) | $ (4,012) | $ 830 | $ (2,675) |

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