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Summary of Significant Accounting Policies - Purchase and Sales Contracts Outstanding (Details) | Aug. 31, 2013 Bushels T Barrels | Aug. 31, 2012 T Bushels Barrels
--- | --- | ---
Sales Contracts |  |
Derivative [Line Items] |  |
Grain and oilseed - bushels | 806,295,000 | 1,074,535,000
Energy products - barrels | 21,312,000 | 19,561,000
Soy products - tons | 847,000 | 215,000
Crop nutrients - tons | 1,050,000 | 725,000
Ocean and barge freight - metric tons | 151,000 | 183,000
Derivative, Number of Units, Cargo and Freight Rail Contract | 43,000 | 34,000
Derivative, Number of Units, Livestock | 17,280,000 | 3,440,000
Purchase Contracts |  |
Derivative [Line Items] |  |
Grain and oilseed - bushels | 521,979,000 | 722,895,000
Energy products - barrels | 12,626,000 | 9,047,000
Soy products - tons | 24,000 | 15,000
Crop nutrients - tons | 968,000 | 600,000
Ocean and barge freight - metric tons | 1,225,000 | 1,018,000
Derivative, Number of Units, Cargo and Freight Rail Contract | 220,000 | 184,000
Derivative, Number of Units, Livestock |  | 2,560,000

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