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Equities Changes in Equity (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended
Equities Changes in Equity (Details) (USD $)	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	Jun. 30, 2014	Aug. 31, 2014	Jan. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			$ 379,772,000
Patronage distribution			(275,553,000)us-gaap_PatronageRefunds
Equity Certificates Repurchased and Retired During Period, Value			(108,723,000)
Equities issued			989,763,000
Dividends, Preferred Stock			(64,723,000)us-gaap_DividendsPreferredStockCash
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(430,000)
Other, net			(6,854,000)us-gaap_StockholdersEquityOther
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	92,897,000us-gaap_ProfitLoss	260,621,000us-gaap_ProfitLoss	471,228,000us-gaap_ProfitLoss	503,649,000us-gaap_ProfitLoss
Net income attributable to CHS Inc.	92,814,000us-gaap_NetIncomeLoss	260,069,000us-gaap_NetIncomeLoss	471,517,000us-gaap_NetIncomeLoss	502,255,000us-gaap_NetIncomeLoss
Net income (loss) attributable to noncontrolling interests	83,000	552,000	(289,000)	1,394,000
Other Comprehensive Income (Loss), Net of Tax	(4,551,000)	(8,130,000)	(5,638,000)	(8,565,000)
Patronage Refunds, Estimated			(132,700,000)chscp_PatronageRefundsEstimated
Equity redemptions, estimate			(53,000,000)chscp_Equityredemptionsestimate
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,659,986,000		7,659,986,000			6,466,844,000
Capital equity certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			(282,290,000)
Patronage distribution			395,287,000
Equity Certificates Repurchased and Retired During Period, Value			(108,442,000)
Equities issued			12,365,000
Other, net			(258,000)
Equity redemptions, estimate			(53,000,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,472,135,000		3,472,135,000			3,508,473,000
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			0
Patronage distribution			0
Equity Certificates Repurchased and Retired During Period, Value			0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(430,000)
Other, net			(6,159,000)
Net income (loss) attributable to noncontrolling interests			(289,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	11,458,000		11,458,000			18,336,000
Nonpatronage Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			0
Patronage distribution			0
Equity Certificates Repurchased and Retired During Period, Value			(79,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	23,177,000		23,177,000			23,256,000
Non-qualified Equity Certificates [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			(148,579,000)
Patronage distribution			147,379,000
Equity Certificates Repurchased and Retired During Period, Value			(221,000)
Other, net			(606,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	282,672,000		282,672,000			284,699,000
Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			0
Patronage distribution			0
Equity Certificates Repurchased and Retired During Period, Value			0
Equities issued			977,398,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,167,575,000		2,167,575,000			1,190,177,000
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			0
Patronage distribution			0
Equity Certificates Repurchased and Retired During Period, Value			0
Other Comprehensive Income (Loss), Net of Tax			(5,638,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(162,395,000)		(162,395,000)			(156,757,000)
Capital Reserves [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reversal of prior year patronage and redemption estimates			810,641,000
Patronage distribution			(818,219,000)
Equity Certificates Repurchased and Retired During Period, Value			19,000
Dividends, Preferred Stock			(64,723,000)
Other, net			169,000
Net income attributable to CHS Inc.			471,517,000
Patronage Refunds, Estimated			(132,700,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,865,364,000		1,865,364,000			1,598,660,000
Class B, Series 4 Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Redemption Amount							517,500,000
Proceeds from Issuance of Preferred Stock, net of Issuance Costs			501,100,000
Preferred Stock, Dividend Rate, Percentage			7.50%
Preferred Stock, Shares Issued							20,700,000
Class B Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Value of Preferred Stock available to be sold under Shelf Registration					2,000,000,000
Class B, Series 3 Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Redemption Amount								492,500,000
Proceeds from Issuance of Preferred Stock, net of Issuance Costs			$ 476,700,000
Preferred Stock, Dividend Rate, Percentage			6.75%
Preferred Stock, Shares Issued								19,700,000
London Interbank Offered Rate (LIBOR) [Member] \| Class B, Series 3 Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Basis Spread on Dividend Rate Percentage			4.155%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Class B, Series 3 Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, Basis Spread on Dividend Rate Percentage			8.00%