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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