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Investments - Schedule of Investments (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Cost method investments $ 124,264 $ 122,788
Investments 3,683,996 3,711,925
CF Industries Nitrogen, LLC    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 2,708,942 2,735,073
Ventura Foods, LLC    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 374,516 360,150
Ardent Mills, LLC    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 209,027 205,898
Other equity method investments    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 267,247 $ 288,016