Investments Equity Method investments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 28, 2022	Nov. 30, 2021	Feb. 28, 2021	Nov. 30, 2020	Feb. 28, 2022	Feb. 28, 2021	Aug. 31, 2021
Schedule of Equity Method Investments [Line Items]
Other Investments	$ 134,224				$ 134,224		$ 128,816
Net income (loss) attributable to CHS Inc.	219,000		$ (38,229)		670,961	$ 31,442
Gross Profit	268,998		101,720		788,906	279,824
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	218,896	$ 451,943	$ (38,358)	$ 69,369	670,839	31,011
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	245,537				245,537		232,923
CF Nitrogen LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	2,712,295				2,712,295		2,667,164
Net income (loss) attributable to CHS Inc.					292,592	53,033
Revenues					3,018,167	1,285,625
Gross Profit					1,547,086	321,565
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest					1,522,292	297,297
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	411,176				411,176		388,612
Ardent Mills LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	233,898				233,898		220,132
TEMCO, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 51,580				51,580		$ 31,464
Ventura Foods, Ardent Mills and TEMCO
Schedule of Equity Method Investments [Line Items]
Net income (loss) attributable to CHS Inc.					67,908	51,729
Revenues					4,677,071	5,502,631
Gross Profit					539,044	422,154
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest					$ 268,319	$ 188,403