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Derivative Financial Instruments and Hedging Activities Purchase and Sale Contracts (Details) - Not Designated as Hedging Instrument [Member] - Forward Contracts [Member]
t in Thousands, rail_car in Thousands, lb in Thousands, T in Thousands, MMBtu in Thousands, Bushels in Thousands, Barrels in Thousands
Nov. 30, 2015
T
rail_car
t
lb
MMBtu
Bushels
Barrels
Aug. 31, 2015
T
rail_car
t
lb
MMBtu
Bushels
Barrels
Grain and oilseed - bushels | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 682,616 711,066
Grain and oilseed - bushels | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 950,565 895,326
Energy products - barrels | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 11,647 17,238
Energy products - barrels | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 7,886 11,676
Soy product contracts [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount 695 706
Soy product contracts [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount 3,120 2,741
Crop nutrients contracts [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount 60 48
Crop nutrients contracts [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount 25 116
Ocean and barge freight contracts [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | t 4,231 5,916
Ocean and barge freight contracts [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | t 2,180 1,962
Rail freight contracts [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | rail_car 227 297
Rail freight contracts [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | rail_car 102 122
Natural Gas [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 10,420 0
Natural Gas [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 0 0
Livestock contracts [Member] | Long [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | lb 40,520 10,480
Livestock contracts [Member] | Short [Member]    
Purchase and Sales Contracts [Line Items]    
Derivative, Nonmonetary Notional Amount | lb 25,000 1,280