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Investments - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | Aug. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (39,441) | $ (35,800) | $ (77,803) | $ (76,128) |
Cost Method Investments |  | 134,743 |  | 134,743 |  | $ 131,605
Investments |  | $ 3,752,876 |  | $ 3,752,876 |  | 3,750,993
CF Nitrogen LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000 |  |  |  |  |
Ownership percentage |  | 11.40% |  | 11.40% |  |
Equity Method Investments |  | $ 2,751,166 |  | $ 2,751,166 |  | 2,756,076
Ventura Foods, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 353,079 |  | 353,079 |  | 347,016
TEMCO, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 37,583 |  | 37,583 |  | 41,323
Ardent Mills LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 211,017 |  | $ 211,017 |  | 206,529
Cargill, Inc. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership of joint venture partner |  | 50.00% |  | 50.00% |  |
Nitrogen Production [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (24,012) | (21,557) | $ (44,347) | (36,253) |
Foods [Member] | Ventura Foods, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  | 50.00% |  |
Equity value exceeding carrying value |  | $ 12,900 |  | $ 12,900 |  |
Corporate and Other |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (9,202) | (10,302) | $ (17,823) | (29,355) |
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 [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity (income) loss from investments |  | $ (5,567) | $ (3,455) | $ (13,821) | $ (8,872) |
Ag [Member] | TEMCO, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  | 50.00% |  |
Miscellaneous Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 265,288 |  | $ 265,288 |  | $ 268,444

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