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Derivatives (Tables) | 12 Months Ended
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Aug. 31, 2017
Derivatives Policy [Abstract] |
Schedule of Derivative Instruments, Purchase and Sales Contracts [Table Text Block] |
| 2017 |  | 2016
| Long |  | Short |  | Long |  | Short
| (Units in thousands)
Grain and oilseed - bushels | 570,673 |  | 768,540 |  |  | 774,279 |  |  | 995,396 |
Energy products - barrels | 15,072 |  | 18,252 |  |  | 14,740 |  |  | 6,470 |
Processed grain and oilseed - tons | 299 |  | 2,347 |  |  | 541 |  |  | 2,060 |
Crop nutrients - tons | 9 |  | 15 |  |  | 108 |  |  | 135 |
Ocean and barge freight - metric tons | 2,777 |  | 1,766 |  |  | 4,406 |  |  | 877 |
Rail freight - rail cars | 176 |  | 75 |  |  | 205 |  |  | 79 |
Natural gas - MMBtu | 500 |  | — |  |  | 3,550 |  |  | 300 |
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | Derivatives Not Designated as Hedging Instruments The majority of our derivative instruments have not been designated as hedging instruments. 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 years ended August 31, 2017, 2016, and 2015. We have revised the information that we have historically included in this table below to correct for errors in the previously disclosed amounts for fiscal 2015. Although such gains and losses have been and continue to be appropriately recorded in the Consolidated Statements of Operations, the previous disclosures for fiscal 2015 did not accurately reflect the derivative gains and losses in each period. These revisions did not materially impact our consolidated financial statements for fiscal 2015.
| Location of Gain (Loss) |  | 2017 |  | 2016 |  | 2015
|  |  | (Dollars in thousands)
Commodity and freight derivatives | Cost of goods sold |  | $ | 208,199 |  |  | $ | (49,975 | ) |  | $ | 143,314 |
Foreign exchange derivatives | Cost of goods sold |  | (13,140 | ) |  | (10,904 | ) |  | 8,962 |
Foreign exchange derivatives | Marketing, general and administrative |  | (1,604 | ) |  | (97 | ) |  | 3,589 |
Interest rate derivatives | Interest expense |  | 8 |  |  | (6,292 | ) |  | 107 |
Embedded derivative | Other income (loss) |  | 30,538 |  |  | — |  |  | — |
Total |  |  | $ | 224,001 |  |  | $ | (67,268 | ) |  | $ | 155,972 |
Schedule of Derivative Instruments [Table Text Block] | The following tables present the gross fair values of derivative assets, derivative liabilities, and margin deposits (cash collateral) recorded on our Consolidated Balance Sheets along with the related amounts permitted to be offset in accordance with U.S. GAAP. We have elected not to offset derivative assets and liabilities when we have the right of offset under ASC Topic 210-20, Balance Sheet - Offsetting; or when the instruments are subject to master netting arrangements under ASC Topic 815-10-45, Derivatives and Hedging - Overall.
| August 31, 2017
|  |  | 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 | $ | 384,648 |  |  | $ | — |  |  | $ | 35,080 |  |  | $ | 349,568 |
Foreign exchange derivatives | 8,771 |  |  | — |  |  | 3,636 |  |  | 5,135 |
Interest rate derivatives - hedge | 9,978 |  |  | — |  |  | — |  |  | 9,978 |
Embedded derivative asset | 25,533 |  |  | — |  |  | — |  |  | 25,533 |
Total | $ | 428,930 |  |  | $ | — |  |  | $ | 38,716 |  |  | $ | 390,214 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 309,762 |  |  | $ | 3,898 |  |  | $ | 35,080 |  |  | $ | 270,784 |
Foreign exchange derivatives | 19,931 |  |  | — |  |  | 3,636 |  |  | 16,295 |
Interest rate derivatives - hedge | 707 |  |  | — |  |  | — |  |  | 707 |
Total | $ | 330,400 |  |  | $ | 3,898 |  |  | $ | 38,716 |  |  | $ | 287,786 |
| August 31, 2016
|  |  | 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 | $ | 500,192 |  |  | $ | — |  |  | $ | 23,689 |  |  | $ | 476,503 |
Foreign exchange derivatives | 21,551 |  |  | — |  |  | 9,187 |  |  | 12,364 |
Interest rate derivatives - hedge | 22,078 |  |  | — |  |  | — |  |  | 22,078 |
Total | $ | 543,821 |  |  | $ | — |  |  | $ | 32,876 |  |  | $ | 510,945 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 491,302 |  |  | $ | 811 |  |  | $ | 23,689 |  |  | $ | 466,802 |
Foreign exchange derivatives | 22,289 |  |  | — |  |  | 9,187 |  |  | 13,102 |
Interest rate derivatives - non-hedge | 8 |  |  | — |  |  | — |  |  | 8 |
Total | $ | 513,599 |  |  | $ | 811 |  |  | $ | 32,876 |  |  | $ | 479,912 |
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The following table presents the pretax gains (losses) recorded in other comprehensive income relating to cash flow hedges for the years ended August 31, 2017, 2016, and 2015:
|  | 2017 |  | 2016 |  | 2015
|  | (Dollars in thousands)
Interest rate derivatives |  | $ | — |  |  | $ | (10,070 | ) |  | $ | (4,078 | )
The following table presents the pretax gains (losses) relating to cash flow hedges that were reclassified from accumulated other comprehensive loss into income for the years ended August 31, 2017, 2016, and 2015:
| Location of Gain (Loss) |  | 2017 |  | 2016 |  | 2015
|  |  | (Dollars in thousands)
Interest rate derivatives | Interest expense |  | $ | (1,742 | ) |  | $ | (5,071 | ) |  | $ | (792 | )

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- Definition Derivatives Policy [Abstract] + References No definition available. + Details
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- Definition [Table Text Block] for Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Table] + References No definition available. + Details
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- Definition Schedule of Derivative Instruments, Purchase and Sales Contracts [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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