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Summary of Significant Accounting Policies - Purchase and Sales Contracts Outstanding (Details) | Nov. 30, 2012 t Barrels Bushels | Aug. 31, 2012 T Barrels Bushels | Nov. 30, 2011 T Bushels Barrels
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Purchase Contracts |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Grain and oilseed - bushels | 674,866,000 | 722,895,000 | 573,239,000
Energy products - barrels | 7,483,000 | 9,047,000 | 8,687,000
Soy products - tons | 21,000 | 15,000 | 14,000
Crop nutrients - tons | 1,270,000 | 600,000 | 829,000
Ocean and barge freight - metric tons | 1,288,000 | 1,018,000 | 1,101,000
Sales Contracts |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Grain and oilseed - bushels | 1,018,510,000 | 1,074,535,000 | 825,374,000
Energy products - barrels | 19,817,000 | 19,561,000 | 13,338,000
Soy products - tons | 360,000 | 215,000 | 285,000
Crop nutrients - tons | 1,428,000 | 725,000 | 1,122,000
Ocean and barge freight - metric tons | 210,000 | 183,000 | 341,000

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