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Investments Equity Method investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Schedule of Equity Method Investments [Line Items]        
Net income (loss) attributable to CHS Inc. $ (45,185) $ 190,275 $ 178,532 $ 425,767
Ardent Mills, Ventura, TEMCO [Member]        
Schedule of Equity Method Investments [Line Items]        
Net Sales 2,043,628 1,623,696 5,807,777 4,673,341
Gross Profit 234,055 255,191 651,705 638,093
Net earnings 133,132 121,022 317,674 283,996
Net income (loss) attributable to CHS Inc. $ 38,662 $ 64,615 $ 104,568 $ 118,845