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Investments - Narrative (Details) $ in Thousands, T in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 01, 2016 USD ($) | Feb. 28, 2017 USD ($) Tons T | Feb. 29, 2016 USD ($) | Feb. 28, 2017 USD ($) Tons T | Feb. 29, 2016 USD ($) | Feb. 01, 2096 USD ($) | Aug. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity (income) loss from investments |  | $ (35,800) | $ (28,004) | $ (76,128) | $ (59,366) |  |
Cost Method Investments |  | 130,148 |  | 130,148 |  |  | $ 127,577
Investments |  | $ 3,802,379 |  | $ 3,802,379 |  |  | 3,795,976
CF Nitrogen LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000 |  |  |  |  |  |
Ownership percentage | 11.40% |  |  |  |  |  |
Supply agreement, term | 80 years |  |  |  |  |  |
Maximum annual granular urea eligible for purchase | T |  | 1.1 |  | 1.1 |  |  |
Maximum annual UAN eligible for purchase | Tons |  | 580,000 |  | 580,000 |  |  |
Equity Method Investments |  | $ 2,784,459 |  | $ 2,784,459 |  |  | 2,796,323
Ventura Foods, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  | 370,089 |  | 370,089 |  |  | 369,487
TEMCO, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  | 41,472 |  | 41,472 |  |  | 44,578
Ardent Mills LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  | $ 202,671 |  | $ 202,671 |  |  | 194,986
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 |  | $ (21,557) | (11,855) | $ (36,253) | (11,855) |  |
Foods [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity (income) loss from investments |  | $ (5,561) | (14,450) | $ (18,930) | (35,527) |  |
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 |  | $ (4,741) | (1,690) | $ (10,425) | (7,576) |  |
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 |  | $ (3,455) | $ 1,355 | $ (8,872) | $ (2,221) |  |
Ag [Member] | TEMCO, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  | 50.00% |  |  |
Scenario, Forecast [Member] | Nitrogen Production [Member] | CF Nitrogen LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  | $ 0 |
Miscellaneous Investments [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  | $ 273,540 |  | $ 273,540 |  |  | $ 263,025

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