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Investments - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2020 USD ($)	Feb. 28, 2019 USD ($)	Feb. 29, 2020 USD ($)	Feb. 28, 2019 USD ($)	Aug. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (34,398)	$ (41,716)	$ (84,060)	$ (108,224)
Cost Method Investments	123,749		123,749		$ 124,264
Investments	$ 3,630,840		3,630,840		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	$ 2,683,405		$ 2,683,405		2,708,942
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	377,307		377,307		374,516
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	208,422		208,422		$ 209,027
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments	$ (27,923)	(35,542)	$ (62,757)	(76,457)
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	$ (10,538)	(5,307)	$ (29,159)	(32,036)
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	$ 4,672	$ 128	$ 8,829	$ 1,337

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