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Investments - Narrative (Details) $ in Thousands	3 Months Ended
Investments - Narrative (Details) $ in Thousands	Nov. 30, 2019 USD ($)	Nov. 30, 2018 USD ($)	Aug. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (49,662)	$ (66,508)
Cost Method Investments	124,964		$ 124,264
Investments	3,713,201		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%
Equity Method Investments	$ 2,743,776		2,708,942
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	378,463		374,516
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	209,956		$ 209,027
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (34,834)	(40,915)
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	$ (18,621)	(26,729)
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	$ 4,157	$ 1,209