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Investments Equity Method investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Schedule of Equity Method Investments [Line Items]        
Net income (loss) attributable to CHS Inc. $ 248,766 $ 166,007 $ 596,270 $ 353,653
Ardent Mills, Ventura, CF Nitrogen [Member] [Member]        
Schedule of Equity Method Investments [Line Items]        
Net Sales     4,385,722 3,788,709
Gross Profit     615,772 420,912
Net earnings     382,852 227,988
Net income (loss) attributable to CHS Inc.     $ 108,552 $ 61,432