Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2017	Nov. 09, 2017
Document Information [Line Items]
Entity Registrant Name	CHS Inc.
Entity Central Index Key	0000823277
Current Fiscal Year End Date	--08-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Aug. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float	$ 0