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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Feb. 28, 2013
Accounting Policies [Abstract] |
Purchase and Sales Contracts | As of February 28, 2013, August 31, 2012 and February 29, 2012, we had the following outstanding purchase and sales contracts:
| February 28, 2013 |  | August 31, 2012 |  | February 29, 2012
| Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts |  | Purchase Contracts |  | Sales Contracts
| (Units in thousands)
Grain and oilseed - bushels | 605,309 |  | 906,758 |  | 722,895 |  | 1,074,535 |  | 550,564 |  | 803,266
Energy products - barrels | 12,103 |  | 21,575 |  | 9,047 |  | 19,561 |  | 12,913 |  | 15,348
Soy products - tons | 32 |  | 333 |  | 15 |  | 215 |  | 14 |  | 252
Crop nutrients - tons | 1,553 |  | 2,128 |  | 600 |  | 725 |  | 1,461 |  | 1,703
Ocean and barge freight - metric tons | 933 |  | 125 |  | 1,018 |  | 183 |  | 1,211 |  | 235
Schedule of Derivative Assets and Liabilities Not Designated as Hedging Instruments | As of February 28, 2013, August 31, 2012 and February 29, 2012, the gross fair values of our derivative assets and liabilities not designated as hedging instruments were as follows:
| February 28, 2013 |  | August 31, 2012 |  | February 29, 2012
Derivative Assets: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 485,219 |  |  | $ | 1,070,800 |  |  | $ | 456,153 |
Foreign exchange derivatives | 15,500 |  |  | 978 |  |  |  |
| $ | 500,719 |  |  | $ | 1,071,778 |  |  | $ | 456,153 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 428,866 |  |  | $ | 727,946 |  |  | $ | 543,470 |
Foreign exchange derivatives | 691 |  |  | 2,388 |  |  | 72 |
Interest rate derivatives | 418 |  |  | 544 |  |  | 586 |
| $ | 429,975 |  |  | $ | 730,878 |  |  | $ | 544,128 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | As of February 28, 2013, August 31, 2012 and February 29, 2012, the gross fair values of our derivative assets and liabilities designated as cash flow hedging instruments were as follows:
| February 28, 2013 |  | August 31, 2012 |  | February 29, 2012
Derivative Assets: |  |  |  |  |
Interest rate swaps | $ | 459 |  |  |  |  |
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | During the second quarter of fiscal 2013, we entered into derivative contracts designated as cash flow hedging instruments that expire in fiscal 2014 with no amounts expected to be included in earnings during the next 12 months. As of February 28, 2013, August 31, 2012 and February 29, 2012, the unrealized gains deferred to accumulated other comprehensive loss were as follows:
| February 28, 2013 |  | August 31, 2012 |  | February 29, 2012
Gains included in accumulated other comprehensive loss, net of tax expense of $0.2 million, $0 million and $0 million, respectively | $ | 284 |  |  |  |  |
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 and six months ended February 28, 2013 and February 29, 2012.
|  |  | For the Three Months Ended |  | For the Six Months Ended
| Location of Gain (Loss) |  | February 28, 2013 |  | February 29, 2012 |  | February 28, 2013 |  | February 29, 2012
Commodity and freight derivatives | Cost of goods sold |  | $ | (102,006 | ) |  | $ | (188,280 | ) |  | $ | (430,290 | ) |  | $ | (274,901 | )
Foreign exchange derivatives | Cost of goods sold |  | 17,903 |  |  | 1,060 |  |  | 16,218 |  |  | (4,384 | )
Interest rate derivatives | Interest, net |  | 64 |  |  |  |  |  | 126 |  |  |  |
|  |  | $ | (84,039 | ) |  | $ | (187,220 | ) |  | $ | (413,946 | ) |  | $ | (279,285 | )
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:
Year 1 | $ | 10,286 |
Year 2 | 6,658 |
Year 3 | 6,026 |
Year 4 | 5,517 |
Year 5 | 3,799 |
Thereafter | 8,971 |
| $ | 41,257 |

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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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