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Summary of Significant Accounting Policies - Purchase and Sales Contracts Outstanding (Details) | Aug. 31, 2012 Bushels t Barrels | Aug. 31, 2011 t Bushels Barrels
--- | --- | ---
Sales Contracts |  |
Purchase and Sales Contracts [Line Items] |  |
Grain and oilseed - bushels | 1,074,535,000 | 796,332,000
Energy products - barrels | 19,561,000 | 14,020,000
Soy products - tons | 215,000 | 269,000
Crop nutrients - tons | 725,000 | 1,420,000
Ocean and barge freight - metric tons | 183,000 | 93,000
Purchase Contracts |  |
Purchase and Sales Contracts [Line Items] |  |
Grain and oilseed - bushels | 722,895,000 | 667,409,000
Energy products - barrels | 9,047,000 | 9,915,000
Soy products - tons | 15,000 | 18,000
Crop nutrients - tons | 600,000 | 1,177,000
Ocean and barge freight - metric tons | 1,018,000 | 983,000

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