Cover Page - shares	6 Months Ended
	Feb. 28, 2021	Apr. 07, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Feb. 28, 2021
Document Transition Report	false
Entity File Number	001-36079
Entity Registrant Name	CHS Inc.
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-0251095
Entity Address, Address Line One	5500 Cenex Drive
Entity Address, City or Town	Inver Grove Heights,
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55077
City Area Code	(651)
Local Phone Number	355-6000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0
Entity Central Index Key	0000823277
Current Fiscal Year End Date	--08-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
8% Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	8% Cumulative Redeemable Preferred Stock
Trading Symbol	CHSCP
Security Exchange Name	NASDAQ
Class B, Series 1 Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class B Cumulative Redeemable Preferred Stock, Series 1
Trading Symbol	CHSCO
Security Exchange Name	NASDAQ
Class B, Series 2 Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class B Reset Rate Cumulative Redeemable Preferred Stock, Series 2
Trading Symbol	CHSCN
Security Exchange Name	NASDAQ
Class B, Series 3 Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class B Reset Rate Cumulative Redeemable Preferred Stock, Series 3
Trading Symbol	CHSCM
Security Exchange Name	NASDAQ
Class B, Series 4 Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class B Cumulative Redeemable Preferred Stock, Series 4
Trading Symbol	CHSCL
Security Exchange Name	NASDAQ