Cover Page - USD ($)	12 Months Ended
	Aug. 31, 2020	Nov. 05, 2020
Entity Information [Line Items]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Aug. 31, 2020
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Public Float	$ 0
Entity Common Stock, Shares Outstanding		0
Entity Central Index Key	0000823277
Current Fiscal Year End Date	--08-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 to the Annual Report on Form 10-K (this "Amendment") of CHS Inc. ("CHS") amends CHS's Annual Report on Form 10-K for the year ended August 31, 2020, which CHS filed with the Securities and Exchange Commission ("SEC") on November 5, 2020 (the "Original Form 10-K"). CHS is filing this Amendment to amend Item 15 to include the consolidated financial statements of its equity investee, CF Industries Nitrogen, LLC ("CF Nitrogen"), as of December 31, 2020 and 2019, and for the three years ended December 31, 2020 (the "CF Nitrogen Financial Statements") pursuant to Rule 3-09 of SEC Regulation S-X.
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