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Derivative Financial Instruments and Hedging Activities Derivative Financial Insturments and Hedging Activities (Tables) | 6 Months Ended
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Feb. 28, 2018
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] |
| February 28, 2018
|  |  | 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 | $ | 423,978 |  |  | $ | — |  |  | $ | 29,401 |  |  | $ | 394,577 |
Foreign exchange derivatives | 6,026 |  |  | — |  |  | 3,125 |  |  | 2,901 |
Embedded derivative asset | 22,704 |  |  | — |  |  | — |  |  | 22,704 |
Total | $ | 452,708 |  |  | $ | — |  |  | $ | 32,526 |  |  | $ | 420,182 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 367,708 |  |  | $ | 30,893 |  |  | $ | 29,401 |  |  | $ | 307,414 |
Foreign exchange derivatives | 12,906 |  |  | — |  |  | 3,125 |  |  | 9,781 |
Interest rate derivatives - non-hedge | 1 |  |  | — |  |  | — |  |  | 1 |
Total | $ | 380,615 |  |  | $ | 30,893 |  |  | $ | 32,526 |  |  | $ | 317,196 |
| 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 |
Embedded derivative asset | 25,533 |  |  | — |  |  | — |  |  | 25,533 |
Total | $ | 418,952 |  |  | $ | — |  |  | $ | 38,716 |  |  | $ | 380,236 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity and freight derivatives | $ | 309,762 |  |  | $ | 3,898 |  |  | $ | 35,080 |  |  | $ | 270,784 |
Foreign exchange derivatives | 19,931 |  |  | — |  |  | 3,636 |  |  | 16,295 |
Total | $ | 329,693 |  |  | $ | 3,898 |  |  | $ | 38,716 |  |  | $ | 287,079 |
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | 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, 2018, and 2017.
|  |  | For the Three Months Ended February 28, |  | For the Six Months Ended February 28,
| Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2018 |  | 2017
|  |  | (Dollars in thousands)
Commodity and freight derivatives | Cost of goods sold |  | $ | (96,310 | ) |  | $ | 56,896 |  |  | $ | (68,559 | ) |  | $ | 75,305 |
Foreign exchange derivatives | Cost of goods sold |  | (5,818 | ) |  | (3,429 | ) |  | 948 |  |  | 2,595 |
Foreign exchange derivatives | Marketing, general and administrative |  | 344 |  |  | (951 | ) |  | (151 | ) |  | (806 | )
Interest rate derivatives | Interest expense |  | (1 | ) |  | 1 |  |  | (1 | ) |  | 4 |
Embedded derivative | Other income |  | 433 |  |  | 468 |  |  | 2,171 |  |  | 29,574 |
Total |  | $ | (101,352 | ) |  | $ | 52,985 |  |  | $ | (65,592 | ) |  | $ | 106,672 |
Schedule of Derivative Instruments, Purchase and Sales Contracts [Table Text Block] | all outstanding commodity and freight contracts accounted for as derivative instruments.
| February 28, 2018 |  | August 31, 2017
| Long |  | Short |  | Long |  | Short
| (Units in thousands)
Grain and oilseed - bushels | 777,266 |  |  | 1,037,549 |  |  | 570,673 |  |  | 768,540 |
Energy products - barrels | 20,648 |  |  | 11,277 |  |  | 15,072 |  |  | 18,252 |
Processed grain and oilseed - tons | 238 |  |  | 1,158 |  |  | 299 |  |  | 2,347 |
Crop nutrients - tons | 15 |  |  | 9 |  |  | 9 |  |  | 15 |
Ocean and barge freight - metric tons | 6,263 |  |  | 3,349 |  |  | 2,777 |  |  | 1,766 |
Rail freight - rail cars | 168 |  |  | 53 |  |  | 176 |  |  | 75 |
Natural gas - MMBtu | 300 |  |  | — |  |  | 500 |  |  | — |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the fair value of our derivative instruments designated as fair value hedges and the line items on our Consolidated Balance Sheets in which they are recorded.
|  |  |  | Derivative Assets |  |  |  | Derivative Liabilities
Fair Value Hedges |  | Balance Sheet Location |  | February 28, 2018 |  | August 31, 2017 |  | Balance Sheet Location |  | February 28, 2018 |  | August 31, 2017
|  |  |  | (Dollars in thousands) |  |  |  | (Dollars in thousands)
Interest rate swaps |  | Other assets |  | $ | — |  |  | $ | 9,978 |  |  | Other liabilities |  | $ | 8,616 |  |  | $ | 707 |
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) | The following table sets forth the pretax gains (losses) on derivatives accounted for as hedging instruments that have been included in our Consolidated Statements of Operations for the three and six months ended February 28, 2018, and 2017.
|  |  |  | For the Three Months Ended February 28, |  | For the Six Months Ended February 28,
Gain (Loss) on Fair Value Hedging Relationships: |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2018 |  | 2017
|  |  |  | (Dollars in thousands)
Interest rate swaps |  | Interest expense |  | $ | (9,571 | ) |  | $ | (4,237 | ) |  | $ | (17,888 | ) |  | $ | (17,513 | )
Hedged item |  | Interest expense |  | 9,571 |  |  | 4,237 |  |  | 17,888 |  |  | 17,513 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location | The following table provides the location and carrying amount of hedged liabilities in our Consolidated Balance Sheets as of February 28, 2018, and August 31, 2017.
|  | February 28, 2018 |  | August 31, 2017
Balance Sheet Location |  | Carrying Amount of Hedged Liabilities |  | Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Liabilities |  | Carrying Amount of Hedged Liabilities |  | Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Liabilities
|  | (Dollars in thousands)
Long-term debt |  | $ | 486,384 |  |  | $ | 8,616 |  |  | $ | 504,271 |  |  | $ | (9,271 | )

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