Investments Equity Method investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Schedule of Equity Method Investments [Line Items]
Net income (loss) attributable to CHS Inc.	$ 54,620	$ 181,807	$ 650,890	$ 535,460
Ardent Mills, Ventura, CF Nitrogen [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Net Sales			6,646,394	6,238,495
Gross Profit			951,969	719,555
Net earnings			688,724	435,192
Net income (loss) attributable to CHS Inc.			$ 168,830	$ 109,266