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Derivative Financial Instruments and Hedging Activities Derivative Financial Insturments and Hedging Activities (Tables) | 3 Months Ended
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Nov. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Reconciliation of gross and net fair values of assets and liabilities subject to offsetting arrangements [Table Text Block] |
| November 30, 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 | $ | 324,867 |  |  | $ | — |  |  | $ | 36,052 |  |  | $ | 288,815 |
Foreign exchange derivatives | 4,297 |  |  | — |  |  | 2,741 |  |  | 1,556 |
Interest rate derivatives - hedge | 3,596 |  |  | — |  |  | — |  |  | 3,596 |
Embedded derivative asset | 22,271 |  |  | — |  |  | — |  |  | 22,271 |
Total | $ | 355,031 |  |  | $ | — |  |  | $ | 38,793 |  |  | $ | 316,238 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 224,656 |  |  | $ | 10,358 |  |  | $ | 36,052 |  |  | $ | 178,246 |
Foreign exchange derivatives | 7,556 |  |  | — |  |  | 2,741 |  |  | 4,815 |
Interest rate derivatives - hedge | 2,641 |  |  | — |  |  | — |  |  | 2,641 |
Total | $ | 234,853 |  |  | $ | 10,358 |  |  | $ | 38,793 |  |  | $ | 185,702 |
| 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 |
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 for accounting purposes. 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, 2017, and 2016.
|  |  | For the Three Months Ended November 30,
| Location of Gain (Loss) |  | 2017 |  | 2016
|  |  | (Dollars in thousands)
Commodity and freight derivatives | Cost of goods sold |  | $ | 27,752 |  |  | $ | 18,410 |
Foreign exchange derivatives | Cost of goods sold |  | 6,766 |  |  | 6,024 |
Foreign exchange derivatives | Marketing, general and administrative |  | (495 | ) |  | 145 |
Interest rate derivatives | Interest expense |  | (1 | ) |  | 2 |
Embedded derivative | Other income |  | 1,738 |  |  | 29,106 |
Total |  | $ | 35,760 |  |  | $ | 53,687 |
Schedule of Derivative Instruments, Purchase and Sales Contracts [Table Text Block] | all outstanding commodity and freight contracts accounted for as derivative instruments.
| November 30, 2017 |  | August 31, 2017
| Long |  | Short |  | Long |  | Short
| (Units in thousands)
Grain and oilseed - bushels | 588,263 |  |  | 805,041 |  |  | 570,673 |  |  | 768,540 |
Energy products - barrels | 16,254 |  |  | 19,300 |  |  | 15,072 |  |  | 18,252 |
Processed grain and oilseed - tons | 196 |  |  | 1,700 |  |  | 299 |  |  | 2,347 |
Crop nutrients - tons | 25 |  |  | 4 |  |  | 9 |  |  | 15 |
Ocean and barge freight - metric tons | 4,785 |  |  | 3,144 |  |  | 2,777 |  |  | 1,766 |
Rail freight - rail cars | 151 |  |  | 68 |  |  | 176 |  |  | 75 |
Natural gas - MMBtu | 1,500 |  |  | — |  |  | 500 |  |  | — |

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- Definition Reconciliation of gross and net fair values of assets and liabilities subject to offsetting arrangements [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + 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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