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Investments - Narrative (Details) $ in Thousands		3 Months Ended
Investments - Narrative (Details) $ in Thousands	Feb. 01, 2016 USD ($)	Nov. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (66,508)	$ (38,362)
Cost Method Investments		124,101		$ 122,788
Investments		$ 3,774,536		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%
Equity Method Investments		$ 2,775,989		2,735,073
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		367,429		360,150
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		212,887		205,898
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (40,915)	(20,335)
Foods [Member] \| Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Corporate and Other
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (26,729)	(8,621)
Corporate and Other \| Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		12.00%
Number of parent companies		3
Ag
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ 1,209	$ (8,254)
Miscellaneous Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 294,130		$ 288,016