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Commitments and Contingencies - Narrative (Details) (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Grain Storage [Abstract]
Inventory, held for third parties	$ 441,300,000	$ 408,800,000
Guarantees [Abstract]
Guarantor obligations, maximum exposure, undiscounted	500,000,000
Guarantor obligations, current carrying value	16,300,000
Lease Commitments
Number of rail cars under operating lease commitments	2,000
Operating leases, rent expense, net	74,600,000	66,200,000	64,300,000
Operating leases, rent expense, sublease rentals	1,600,000	2,000,000	1,400,000
Unrecorded unconditional purchase obligation	6,270,259,000	5,000,000,000
CHS
Credit Commitments [Abstract]
CHS Capital long-term notes receivable additional available credit of counterparty	$ 841,300,000
Minimum
Lease Commitments
Operating lease terms	1 year
Maximum
Lease Commitments
Operating lease terms	10 years

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Inventories held for third parties (not included in the Company's inventories).

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Operating Leases, Number of Railroad Transportation Equipment Leased

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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