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Derivative Financial Instruments and Hedging Activities Purchase and Sale Contracts (Details) (Forward Contracts [Member]) | Feb. 28, 2014 Bushels | Aug. 31, 2013 Bushels | Feb. 28, 2013 Bushels
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Grain and oilseed - bushels | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 651,998,000 | 521,979,000 | 605,309,000
Grain and oilseed - bushels | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 1,009,946,000 | 806,295,000 | 906,758,000
Energy products - barrels | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 29,067,000 | 12,626,000 | 12,103,000
Energy products - barrels | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 32,897,000 | 21,312,000 | 21,575,000
Soy products - tons | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 16,000 | 24,000 | 32,000
Soy products - tons | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 784,000 | 847,000 | 333,000
Crop nutrients - tons | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 1,520,000 | 968,000 | 933,000
Crop nutrients - tons | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 2,535,000 | 1,050,000 | 125,000
Rail freight - rail cars | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 298,000 | 220,000 | 153,000
Rail freight - rail cars | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 157,000 | 43,000 | 41,000
Derivative number of units livestock [Member] | Long [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | 2,920,000
Derivative number of units livestock [Member] | Short [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | 10,800,000 | 17,280,000 | 2,520,000

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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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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration