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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
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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

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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