Receivables - Narrative (Details) (USD $)	6 Months Ended
	Feb. 28, 2015	Aug. 31, 2014
Notes Receivable, Long-Term
CHS Capital long-term notes receivable	$ 148,300,000	$ 159,700,000
Percentage of commercial notes to CHS Capital long-term notes receivable	51.00%	46.00%
Percentage of producer notes to CHS Capital long-term notes receivable	49.00%	54.00%
Interest Income Accrual Term, Discontinued	90 days
CHS Capital long-term notes receivable additional available credit of counterparty	$ 1,000,000,000
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and Loans Receivable, Current, Term	12 months
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and Loans Receivable, Current, Term	14 months
Notes and Loans Receivable, Non Current, Net, Term	10 years