Document and Entity Information - shares	6 Months Ended
	Feb. 28, 2018	Apr. 04, 2018
DEI [Abstract]
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-Q
Document Period End Date	Feb. 28, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		0