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Investments - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 01, 2016	Nov. 30, 2017	Nov. 30, 2016	Aug. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (38,362)	$ (40,328)
Cost Method Investments		135,204		$ 131,605
Investments		$ 3,777,000		3,750,993
CF Nitrogen LLC [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	$ 2,800,000
Ownership percentage		11.40%
Equity Method Investments		$ 2,776,412		2,756,076
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		350,602		347,016
TEMCO, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		39,235		41,323
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 209,926		206,529
Cargill, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership of joint venture partner		50.00%
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (20,335)	(14,696)
Foods [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (3,440)	(13,369)
Foods [Member] | Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Equity value exceeding carrying value		$ 12,900
Corporate and Other
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (5,181)	(5,684)
Corporate and Other | Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		12.00%
Number of parent companies		3
Ag [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) loss from investments		$ (8,254)	$ (5,417)
Ag [Member] | TEMCO, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Miscellaneous Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 265,621		$ 268,444

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