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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

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- Definition Nominal number of units used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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