Investments Equity Method investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Aug. 31, 2021
Schedule of Equity Method Investments [Line Items]
Other Investments	$ 130,335		$ 128,816
Net income (loss) attributable to CHS Inc.	451,961	$ 69,671
Gross Profit	519,908	178,104
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	451,943	69,369
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	235,511		232,923
CF Nitrogen LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	2,783,637		2,667,164
Net income (loss) attributable to CHS Inc.	116,473	21,688
Revenues	1,316,899	606,340
Gross Profit	575,571	94,068
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	562,593	81,173
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	389,818		388,612
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	225,889		220,132
TEMCO, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	44,319		$ 31,464
Ventura Foods, Ardent Mills and TEMCO
Schedule of Equity Method Investments [Line Items]
Net income (loss) attributable to CHS Inc.	26,737	25,178
Revenues	2,313,761	3,375,014
Gross Profit	238,883	204,426
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 112,641	$ 89,656