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Investments - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
Investments - Narrative (Details) $ in Thousands	Feb. 01, 2016 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($)	Aug. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (65,170)	$ (59,308)	$ (173,394)	$ (137,111)
Cost Method Investments		123,590		123,590		$ 122,788
Investments		$ 3,738,140		$ 3,738,140		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		$ 2,767,053		$ 2,767,053		2,735,073
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		368,774		368,774		360,150
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		209,624		209,624		205,898
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (41,959)	(35,639)	$ (118,416)	(79,986)
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		$ (18,439)	(11,343)	$ (50,475)	(29,166)
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		$ (4,012)	$ (11,359)	$ (2,675)	$ (25,180)
Miscellaneous Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 269,099		$ 269,099		$ 288,016