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Summary of Significant Accounting Policies (Tables) | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2013 | Aug. 31, 2013 | Nov. 30, 2012
Accounting Policies [Abstract] |  |  |
Purchase and Sales Contracts | As of November 30, 2013, August 31, 2013 and November 30, 2012, we had the following outstanding purchase and sales contracts:
| November 30, 2013 |  | August 31, 2013 |  | November 30, 2012
| Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts
| (Units in thousands)
Grain and oilseed - bushels | 671,414 |  | 944,517 |  | 521,979 |  | 806,295 |  | 674,866 |  | 1,018,510
Energy products - barrels | 27,352 |  | 33,110 |  | 12,626 |  | 21,312 |  | 7,483 |  | 19,817
Soy products - tons | 12 |  | 885 |  | 24 |  | 847 |  | 21 |  | 360
Crop nutrients - tons | 986 |  | 1,204 |  | 968 |  | 1,050 |  | 1,270 |  | 1,428
Ocean and barge freight - metric tons | 2,054 |  | 295 |  | 1,225 |  | 151 |  | 1,288 |  | 210
Rail freight - rail cars | 201 |  | 48 |  | 220 |  | 43 |  | 164 |  | 30
Livestock - pounds |  |  | 12,480 |  |  |  | 17,280 |  | 2,680 |  | 3,280
Reconciliation of gross and net fair values of assets and liabilities subject to offsetting arrangements [Table Text Block] |
| November 30, 2013
|  |  | Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting |  |
| Gross Amounts Recognized |  | Cash Collateral |  | Derivative Instruments |  | Net Amounts
| (Dollars in thousands)
Derivative Assets: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 364,454 |  |  | $ | 268 |  |  | $ | 41,126 |  |  | $ | 323,060 |
Foreign exchange derivatives | 6,776 |  |  |  |  | 1,060 |  |  | 5,716 |
Interest rate derivatives - hedge | 18,854 |  |  |  |  |  |  | 18,854 |
| $ | 390,084 |  |  | $ | 268 |  |  | $ | 42,186 |  |  | $ | 347,630 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 405,346 |  |  | $ | 7,374 |  |  | $ | 41,126 |  |  | $ | 356,846 |
Foreign exchange derivatives | 1,647 |  |  |  |  | 1,060 |  |  | 587 |
Interest rate derivatives - non-hedge | 245 |  |  |  |  |  |  | 245 |
| $ | 407,238 |  |  | $ | 7,374 |  |  | $ | 42,186 |  |  | $ | 357,678 |
| August 31, 2013
|  |  | Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting |  |
| Gross Amounts Recognized |  | Cash Collateral |  | Derivative Instruments |  | Net Amounts
| (Dollars in thousands)
Derivative Assets: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 468,673 |  |  |  |  | $ | 53,107 |  |  | $ | 415,566 |
Foreign exchange derivatives | 7,079 |  |  |  |  | 957 |  |  | 6,122 |
Interest rate derivatives - hedge | 24,135 |  |  |  |  |  |  | 24,135 |
Interest rate derivatives - non-hedge | 3 |  |  |  |  | 3 |  |  |
| $ | 499,890 |  |  |  |  | $ | 54,067 |  |  | $ | 445,823 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 458,893 |  |  | $ | 1,591 |  |  | $ | 53,107 |  |  | $ | 404,195 |
Foreign exchange derivatives | 5,925 |  |  |  |  | 957 |  |  | 4,968 |
Interest rate derivatives - non-hedge | 248 |  |  |  |  | 3 |  |  | 245 |
| $ | 465,066 |  |  | $ | 1,591 |  |  | $ | 54,067 |  |  | $ | 409,408 |
| November 30, 2012
|  |  | Amounts Not Offset on the Consolidated Balance Sheet but Eligible for Offsetting |  |
| Gross Amounts Recognized |  | Cash Collateral |  | Derivative Instruments |  | Net Amounts
| (Dollars in thousands)
Derivative Assets: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 632,544 |  |  |  |  | $ | 46,578 |  |  | $ | 585,966 |
Foreign exchange derivatives | 3,140 |  |  |  |  | 1 |  |  | 3,139 |
| $ | 635,684 |  |  |  |  | $ | 46,579 |  |  | $ | 589,105 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 518,377 |  |  | $ | 10,087 |  |  | $ | 46,578 |  |  | $ | 461,712 |
Foreign exchange derivatives | 6,234 |  |  |  |  | 1 |  |  | 6,233 |
Interest rate derivatives - non-hedge | 483 |  |  |  |  |  |  | 483 |
| $ | 525,094 |  |  | $ | 10,087 |  |  | $ | 46,579 |  |  | $ | 468,428 |
Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] | Even though we have netting arrangements for our exchange-traded futures and options contracts and certain over-the-counter (OTC) contracts, we report our derivatives on a gross basis on our Consolidated Balance Sheets. Our associated margin deposits are also reported on a gross basis. Many of our derivative contracts with futures and options brokers require us to make both initial margin deposits of cash or other assets and subsequent deposits, depending on changes in commodity prices, in order to comply with applicable regulations. Our margin deposit assets are held by external brokers in segregated accounts and will be used to settle the associated derivative contracts on their specified settlement dates. |  |
Schedule of Derivative Instruments, Gain (Loss) in Consolidated Statements of Operations | The following table sets forth the pretax gains (losses) on derivatives not accounted for as hedging instruments that have been included in our Consolidated Statements of Operations for the three months ended November 30, 2013 and 2012.
| Location of Gain (Loss) |  | 2013 |  | 2012
|  |  | (Dollars in thousands)
Commodity and freight derivatives | Cost of goods sold |  | $ | (19,789 | ) |  | $ | (328,284 | )
Foreign exchange derivatives | Cost of goods sold |  | (422 | ) |  | (1,685 | )
Interest rate derivatives | Interest, net |  | (1 | ) |  | (9 | )
|  |  | $ | (20,212 | ) |  | $ | (329,978 | )
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The estimated annual amortization expense related to intangible assets subject to amortization for the next five years is as follows:
| (Dollars in thousands) |
Year 1 | $ | 7,511 |
Year 2 | 6,516 |
Year 3 | 6,066 |
Year 4 | 4,376 |
Year 5 | 2,043 |
Thereafter | 9,398 |
| $ | 35,910 |

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