Investments - Schedule of Equity Method Investment Balance Sheet and Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Schedule of Equity Method Investments [Line Items]
Net income attributable to CHS Inc.	$ 781,045	$ 1,081,435	$ 992,386
Ardent Mills, Ventura, TEMCO [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	9,071,438	8,796,648	7,929,731
Equity Method Investment, Summarized Financial Information, Current Assets	1,892,563	1,765,992
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	2,388,757	2,397,231
Equity Method Investment, Summarized Financial Information, Current Liabilities	968,104	838,031
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities	881,312	912,636
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)	754,384	562,053	467,955
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	313,668	266,354	149,573
Net income attributable to CHS Inc.	$ 81,103	$ 83,023	$ 80,905