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Derivatives Purchase and Sales Contracts Outstanding (Details) - Not Designated as Hedging Instrument [Member]
t in Thousands, rail_car in Thousands, T in Thousands, MMBtu in Thousands, Bushels in Thousands, Barrels in Thousands
Aug. 31, 2016
T
rail_car
t
Bushels
MMBtu
Barrels
Aug. 31, 2015
T
rail_car
t
Bushels
MMBtu
Barrels
Grain and oilseed contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 774,279 711,066
Grain and oilseed contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 995,396 895,326
Energy products [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 14,740 17,238
Energy products [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 6,470 11,676
Processed grain and oilseed contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 541 706
Processed grain and oilseed contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 2,060 2,741
Crop nutrient contracts | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 108 48
Crop nutrient contracts | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 135 116
Ocean and barge freight contracts | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | t 4,406 5,916
Ocean and barge freight contracts | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | t 877 1,962
Rail freight contracts | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | rail_car 205 297
Rail freight contracts | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | rail_car 79 122
Natural gas contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 3,550 0
Natural gas contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 300 0