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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, 2019 T t Bushels MMBtu Barrels | Aug. 31, 2018 T t Bushels MMBtu Barrels
--- | --- | ---
Grain and oilseed contracts [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bushels | 547,096 | 715,866
Grain and oilseed contracts [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Bushels | 717,522 | 929,873
Energy products [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Barrels | 13,895 | 17,011
Energy products [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | Barrels | 4,663 | 8,329
Processed grain and oilseed contracts [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 597 | 1,064
Processed grain and oilseed contracts [Member] | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 2,454 | 2,875
Crop nutrient contracts | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 76 | 11
Crop nutrient contracts | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 23 | 76
Ocean freight contracts | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | t | 295 | 227
Ocean freight contracts | Short [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | t | 85 | 45
Natural gas contracts [Member] | Long [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | MMBtu | 130 | 610
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=109980867&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=109980867&loc=SL5579245-113959 + Details
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