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Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Aug. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity income from investments	$ (50,023)	$ (49,662)
Cost Method Investments	124,130		$ 123,955
Investments	3,666,474		3,630,033
Investment Company, Distributable Earnings	424,400
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	$ 2,684,306		2,662,618
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 388,869		381,351
TEMCO, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	12.00%
Equity Method Investments	$ 211,120		$ 208,927
Nitrogen Production [Member]
Schedule of Equity Method Investments [Line Items]
Equity income from investments	$ (21,688)	(34,834)
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 from investments	$ (17,672)	(18,621)
Ag
Schedule of Equity Method Investments [Line Items]
Equity income from investments	$ (10,174)	$ 4,157

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