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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Nov. 30, 2012
Accounting Policies [Abstract] |
Purchase and Sales Contracts | As of November 30, 2012, August 31, 2012 and November 30, 2011, we had the following outstanding purchase and sales contracts:
| November 30, 2012 |  | August 31, 2012 |  | November 30, 2011
| Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts
| (Units in thousands)
Grain and oilseed - bushels | 674,866 |  | 1,018,510 |  | 722,895 |  | 1,074,535 |  | 573,239 |  | 825,374
Energy products - barrels | 7,483 |  | 19,817 |  | 9,047 |  | 19,561 |  | 8,687 |  | 13,338
Soy products - tons | 21 |  | 360 |  | 15 |  | 215 |  | 14 |  | 285
Crop nutrients - tons | 1,270 |  | 1,428 |  | 600 |  | 725 |  | 829 |  | 1,122
Ocean and barge freight - metric tons | 1,288 |  | 210 |  | 1,018 |  | 183 |  | 1,101 |  | 341
Schedule of Derivative Assets and Liabilities Not Designated as Hedging Instruments | As of November 30, 2012, August 31, 2012 and November 30, 2011, the gross fair values of our derivative assets and liabilities not designated as hedging instruments were as follows:
| November 30, 2012 |  | August 31, 2012 |  | November 30, 2011
|  |  | (Dollars in thousands)
Derivative Assets: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 632,544 |  |  | $ | 1,070,800 |  |  | $ | 641,890 |
Foreign exchange derivatives | 3,140 |  |  | 978 |  |  | 15 |
| $ | 635,684 |  |  | $ | 1,071,778 |  |  | $ | 641,905 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 518,377 |  |  | $ | 727,946 |  |  | $ | 540,426 |
Foreign exchange derivatives | 6,234 |  |  | 2,388 |  |  |  |
Interest rate derivatives | 483 |  |  | 544 |  |  | 595 |
| $ | 525,094 |  |  | $ | 730,878 |  |  | $ | 541,021 |
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, 2012 and 2011.
| Location of Gain (Loss) |  | 2012 |  | 2011
|  |  | (Dollars in thousands)
Commodity and freight derivatives | Cost of goods sold |  | $ | (328,284 | ) |  | $ | (50,933 | )
Foreign exchange derivatives | Cost of goods sold |  | (1,685 | ) |  | 686 |
Interest rate derivatives | Interest, net |  | (9 | ) |  |  |
|  |  | $ | (329,978 | ) |  | $ | (50,247 | )
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 | $ | 10,666 |
Year 2 | 7,078 |
Year 3 | 6,134 |
Year 4 | 5,875 |
Year 5 | 4,537 |
Thereafter | 9,176 |
| $ | 43,466 |

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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