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Derivative Financial Instruments and Hedging Activities - Purchase and Sales Contracts Outstanding (Details) - Not Designated as Hedging Instrument
t in Thousands, T in Thousands, MMBtu in Thousands, Bushels in Thousands, Barrels in Thousands
Aug. 31, 2020
T
MMBtu
Barrels
Bushels
t
Aug. 31, 2019
T
t
MMBtu
Barrels
Bushels
Grain and oilseed contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 664,673 547,096
Grain and oilseed contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Bushels 892,303 717,522
Energy products [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 10,028 13,895
Energy products [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | Barrels 6,570 4,663
Processed grain and oilseed contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 657 597
Processed grain and oilseed contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 3,304 2,454
Crop nutrient contracts | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 74 76
Crop nutrient contracts | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 127 23
Ocean freight contracts | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | t 1,140 295
Ocean freight contracts | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | t 95 85
Natural gas contracts [Member] | Long [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 0 130
Natural gas contracts [Member] | Short [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBtu 0 0