Cover Page - shares
 9 Months Ended
May 31, 2021
Jul. 08, 2021
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date May 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, 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 Q3  
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