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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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May 31, 2019
Finite-Lived Intangible Assets [Line Items] |
Schedule of Goodwill [Table Text Block] |
| Energy |  | Ag |  | Corporate and Other |  | Total
| (Dollars in thousands)
Balances, August 31, 2018 | $ | 552 |  |  | $ | 127,338 |  |  | $ | 10,574 |  |  | $ | 138,464 |
Goodwill acquired during the period | — |  |  | 61,358 |  |  | — |  |  | 61,358 |
Balances, May 31, 2019 | $ | 552 |  |  | $ | 188,696 |  |  | $ | 10,574 |  |  | $ | 199,822 |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
| May 31, 2019 |  | August 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
| (Dollars in thousands)
Customer lists | $ | 84,815 |  |  | $ | (16,054 | ) |  | $ | 68,761 |  |  | $ | 40,815 |  |  | $ | (13,082 | ) |  | $ | 27,733 |
Trademarks and other intangible assets | 9,736 |  |  | (5,393 | ) |  | 4,343 |  |  | 6,536 |  |  | (4,931 | ) |  | 1,605 |
Total intangible assets | $ | 94,551 |  |  | $ | (21,447 | ) |  | $ | 73,104 |  |  | $ | 47,351 |  |  | $ | (18,013 | ) |  | $ | 29,338 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense |
| (Dollars in thousands)
Year 1 | $ | 4,540 |
Year 2 | 4,487 |
Year 3 | 4,187 |
Year 4 | 3,944 |
Year 5 | 3,940 |

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