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Investments - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 01, 2016 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 2018 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 2018 USD ($)	Aug. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (41,716)	$ (39,441)	$ (108,224)	$ (77,803)
Cost Method Investments		123,280		123,280		$ 122,788
Investments		$ 3,718,097		$ 3,718,097		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%		10.00%
Equity Method Investments		$ 2,725,095		$ 2,725,095		2,735,073
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		372,220		372,220		360,150
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		208,989		208,989		205,898
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (35,542)	(24,012)	$ (76,457)	(44,347)
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		$ (5,307)	(9,202)	$ (32,036)	(17,823)
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		$ 128	$ (5,567)	$ 1,337	$ (13,821)
Miscellaneous Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 288,513		$ 288,513		$ 288,016

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