| Cover Page - USD ($) | 12 Months Ended | |
| Aug. 31, 2021 | Nov. 04, 2021 | |
| Entity Information [Line Items] | ||
| Document Type | 10-K/A | |
| Document Annual Report | true | |
| Document Period End Date | Aug. 31, 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, 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 | 2021 | |
| Document Fiscal Period Focus | FY | |
| Amendment Flag | true | |
| Entity Address, Address Line One | 5500 Cenex Drive | |
| 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, 2021, which CHS filed with the Securities and Exchange Commission ("SEC") on November 4, 2021 (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, 2021 and 2020, and for the three years ended December 31, 2021 (the "CF Nitrogen Financial Statements"), pursuant to Rule 3-09 of SEC Regulation S-X, and to correct a typographical error in the I.R.S. Employer Identification Number on the cover page of the Original Form 10-K. | |
| 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 |
