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Segment Reporting - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | May 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Nov. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | May 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Nov. 30, 2016 USD ($) | Feb. 28, 2018 USD ($) | Feb. 28, 2017 USD ($) | May 31, 2018 USD ($) | May 31, 2017 USD ($) | Aug. 31, 2018 USD ($) segment | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Revenues | $ 8,583,982 | $ 9,087,328 | $ 6,980,153 | $ 8,031,884 | $ 7,996,339 | $ 8,638,410 | $ 7,400,773 | $ 8,001,904 | $ 15,012,037 | $ 15,402,677 | $ 24,099,365 | $ 24,041,087 | $ 32,683,347 | $ 32,037,426 | $ 30,355,260
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,500,000 | $ 29,000,000 | $ 26,500,000
TEMCO | Ag |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
CF Industries Nitrogen, LLC | Nitrogen Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 10.00% |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Ventura Foods | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Ardent Mills, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 12.00% |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |
Ardent Mills, LLC | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 12.00% |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |

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