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Derivative Financial Instruments and Hedging Activities (Tables) | 12 Months Ended
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Aug. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of gross fair values of derivative assets, derivative liabilities, and margin deposits (cash collateral) | 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, 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 derivatives | $ | 313,033 |  |  | $ | — |  |  | $ | 26,781 |  |  | $ | 286,252 |
Foreign exchange derivatives | 15,401 |  |  | — |  |  | 8,703 |  |  | 6,698 |
Embedded derivative asset | 23,595 |  |  | — |  |  | — |  |  | 23,595 |
Total | $ | 352,029 |  |  | $ | — |  |  | $ | 35,484 |  |  | $ | 316,545 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity derivatives | $ | 421,054 |  |  | $ | 12,983 |  |  | $ | 26,781 |  |  | $ | 381,290 |
Foreign exchange derivatives | 24,701 |  |  | — |  |  | 8,703 |  |  | 15,998 |
Total | $ | 445,755 |  |  | $ | 12,983 |  |  | $ | 35,484 |  |  | $ | 397,288 |
| August 31, 2017 (As Restated)
|  |  | 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 derivatives | $ | 215,349 |  |  | $ | — |  |  | $ | 34,912 |  |  | $ | 180,437 |
Foreign exchange derivatives | 8,779 |  |  | — |  |  | 3,636 |  |  | 5,143 |
Embedded derivative asset | 25,533 |  |  | — |  |  | — |  |  | 25,533 |
Total | $ | 249,661 |  |  | $ | — |  |  | $ | 38,548 |  |  | $ | 211,113 |
Derivative Liabilities: |  |  |  |  |  |  |
Commodity derivatives | $ | 293,330 |  |  | $ | 3,898 |  |  | $ | 34,912 |  |  | $ | 254,520 |
Foreign exchange derivatives | 19,931 |  |  | — |  |  | 3,636 |  |  | 16,295 |
Total | $ | 313,261 |  |  | $ | 3,898 |  |  | $ | 38,548 |  |  | $ | 270,815 |
Pretax gains (losses) on derivatives not accounted for 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, 2018, 2017, and 2016.
| Location of Gain (Loss) |  | 2018 |  | (As Restated) 2017 |  | (As Restated) 2016
|  |  | (Dollars in thousands)
Commodity derivatives | Cost of goods sold |  | $ | 162,321 |  |  | $ | 168,569 |  |  | $ | (67,014 | )
Foreign exchange derivatives | Cost of goods sold |  | (26,010 | ) |  | (13,140 | ) |  | (10,904 | )
Foreign exchange derivatives | Marketing, general and administrative |  | 596 |  |  | (1,604 | ) |  | (97 | )
Interest rate derivatives | Interest expense |  | (1 | ) |  | 8 |  |  | (6,292 | )
Embedded derivative | Other income (loss) |  | 3,061 |  |  | 30,533 |  |  | — |
Total |  |  | $ | 139,967 |  |  | $ | 184,366 |  |  | $ | (84,307 | )
Schedule of notional volumes for outstanding commodity contracts | The table below presents the notional volumes for all outstanding commodity contracts accounted for as derivative instruments.
| 2018 |  | (As Restated) 2017
| Long |  | Short |  | Long |  | Short
| (Units in thousands)
Grain and oilseed - bushels | 715,866 |  |  | 929,873 |  |  | 569,243 |  |  | 767,110 |
Energy products - barrels | 17,011 |  |  | 8,329 |  |  | 15,072 |  |  | 18,252 |
Processed grain and oilseed - tons | 1,064 |  |  | 2,875 |  |  | 299 |  |  | 2,347 |
Crop nutrients - tons | 11 |  |  | 76 |  |  | 9 |  |  | 15 |
Ocean freight - metric tons | 227 |  |  | 45 |  |  | 160 |  |  | 198 |
Natural gas - MMBtu | 610 |  |  | — |  |  | 500 |  |  | — |
Schedule of fair value of derivative interest rate swap instruments designated as fair value hedges | The following table presents the fair value of our derivative interest rate swap instruments designated as fair value hedges and the line items on our Consolidated Balance Sheets in which they are recorded as of August 31, 2018, and 2017.
|  | 2018 |  | 2017 |  |  |  | 2018 |  | 2017
Balance Sheet Location |  | Derivative Assets |  | Balance Sheet Location |  | Derivative Liabilities
|  | (Dollars in thousands) |  |  |  | (Dollars in thousands)
Derivative assets |  | $ | — |  |  | $ | — |  |  | Derivative liabilities |  | $ | 771 |  |  | $ | — |
Other assets |  | — |  |  | 9,978 |  |  | Other liabilities |  | 8,681 |  |  | 707 |
Total |  | $ | — |  |  | $ | 9,978 |  |  | Total |  | $ | 9,452 |  |  | $ | 707 |
Schedule of pretax gains (losses) on derivatives accounted for as hedging instruments | 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 years ended August 31, 2018, 2017, and 2016.
Gain (Loss) on Fair Value Hedging Relationships: |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
|  |  |  | (Dollars in thousands)
Interest rate swaps |  | Interest expense |  | $ | 18,723 |  |  | $ | 12,806 |  |  | $ | (9,842 | )
Hedged item |  | Interest expense |  | (18,723 | ) |  | (12,806 | ) |  | 9,842 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |
The following table presents the pretax gains (losses) recorded in other comprehensive income relating to cash flow hedges for the years ended August 31, 2018, 2017, and 2016:
|  | 2018 |  | 2017 |  | 2016
|  | (Dollars in thousands)
Interest rate derivatives |  | $ | 178 |  |  | $ | — |  |  | $ | (10,070 | )
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, 2018, 2017, and 2016:
| Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
|  |  | (Dollars in thousands)
Interest rate derivatives | Interest expense |  | $ | (1,704 | ) |  | $ | (1,742 | ) |  | $ | (5,071 | )
Schedule of location and carrying amount of hedged liabilities | The following table provides the location and carrying amount of hedged liabilities in our Consolidated Balance Sheets as of August 31, 2018, and 2017.
|  | August 31, 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 |  | $ | 485,548 |  |  | $ | 9,452 |  |  | $ | 504,271 |  |  | $ | (9,271 | )

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