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Investments - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2016 USD ($) | May 31, 2019 USD ($) | May 31, 2018 USD ($) | May 31, 2019 USD ($) | May 31, 2018 USD ($) | Aug. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (65,170) | $ (59,308) | $ (173,394) | $ (137,111) |
Cost Method Investments |  | 123,590 |  | 123,590 |  | $ 122,788
Investments |  | $ 3,738,140 |  | $ 3,738,140 |  | 3,711,925
CF Nitrogen LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000 |  |  |  |  |
Ownership percentage |  | 10.00% |  | 10.00% |  |
Equity Method Investments |  | $ 2,767,053 |  | $ 2,767,053 |  | 2,735,073
Ventura Foods, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 368,774 |  | 368,774 |  | 360,150
Ardent Mills LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 209,624 |  | 209,624 |  | 205,898
Nitrogen Production [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (41,959) | (35,639) | $ (118,416) | (79,986) |
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 |  | $ (18,439) | (11,343) | $ (50,475) | (29,166) |
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 |  | $ (4,012) | $ (11,359) | $ (2,675) | $ (25,180) |
Miscellaneous Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 269,099 |  | $ 269,099 |  | $ 288,016

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