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Investments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
Investments - Narrative (Details) $ in Thousands	May 31, 2020 USD ($)	May 31, 2019 USD ($)	May 31, 2020 USD ($)	May 31, 2019 USD ($)	Aug. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (51,114)	$ (65,170)	$ (135,174)	$ (173,394)
Cost Method Investments	123,311		123,311		$ 124,264
Investments	$ 3,666,959		3,666,959		3,683,996
CF Nitrogen LLC [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments			$ 2,700,000
Ownership percentage	10.00%		10.00%
Equity Method Investments	$ 2,724,668		$ 2,724,668		2,708,942
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	364,726		364,726		374,516
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	206,476		206,476		$ 209,027
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (41,264)	(41,959)	$ (104,021)	(118,416)
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	$ (582)	(18,439)	$ (29,741)	(50,475)
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	$ (7,999)	$ (4,012)	$ 830	$ (2,675)