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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, Bushels in Thousands, Barrels in Thousands | Aug. 31, 2021 t T Bushels Barrels | Aug. 31, 2020 T t Barrels Bushels
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Grain and oilseed contracts [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bushels | 666,726 | 664,673
Grain and oilseed contracts [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bushels | 851,582 | 892,303
Energy products [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Barrels | 9,881 | 10,028
Energy products [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Barrels | 7,656 | 6,570
Processed grain and oilseed contracts [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 559 | 657
Processed grain and oilseed contracts [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 3,418 | 3,304
Crop nutrient contracts | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 66 | 74
Crop nutrient contracts | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 12 | 127
Ocean freight contracts | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | t | 210 | 1,140
Ocean freight contracts | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | t | 0 | 95

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