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Summary of Significant Accounting Policies - Purchase and Sales Contracts Outstanding (Details) | Feb. 28, 2013 t Barrels Bushels | Aug. 31, 2012 T Barrels Bushels | Feb. 29, 2012 T Bushels Barrels
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Purchase Contracts |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Grain and oilseed - bushels | 605,309,000 | 722,895,000 | 550,564,000
Energy products - barrels | 12,103,000 | 9,047,000 | 12,913,000
Soy products - tons | 32,000 | 15,000 | 14,000
Crop nutrients - tons | 1,553,000 | 600,000 | 1,461,000
Ocean and barge freight - metric tons | 933,000 | 1,018,000 | 1,211,000
Sales Contracts |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Grain and oilseed - bushels | 906,758,000 | 1,074,535,000 | 803,266,000
Energy products - barrels | 21,575,000 | 19,561,000 | 15,348,000
Soy products - tons | 333,000 | 215,000 | 252,000
Crop nutrients - tons | 2,128,000 | 725,000 | 1,703,000
Ocean and barge freight - metric tons | 125,000 | 183,000 | 235,000

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