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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Feb. 28, 2018
Finite-Lived Intangible Assets [Line Items] |
Schedule of Goodwill [Table Text Block] |
| Energy |  | Ag |  | Corporate and Other |  | Total
| (Dollars in thousands)
Balances, August 31, 2017 | $ | 552 |  |  | $ | 142,929 |  |  | $ | 10,574 |  |  | $ | 154,055 |
Effect of foreign currency translation adjustments | — |  |  | (277 | ) |  | — |  |  | (277 | )
Balances, February 28, 2018 | $ | 552 |  |  | $ | 142,652 |  |  | $ | 10,574 |  |  | $ | 153,778 |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
| February 28, 2018 |  | August 31, 2017
| Carrying Amount |  | Accumulated Amortization |  | Net |  | Carrying Amount |  | Accumulated Amortization |  | Net
| (Dollars in thousands)
Customer lists | $ | 41,077 |  |  | $ | (11,565 | ) |  | $ | 29,512 |  |  | $ | 46,180 |  |  | $ | (14,695 | ) |  | $ | 31,485 |
Trademarks and other intangible assets | 6,536 |  |  | (4,811 | ) |  | 1,725 |  |  | 23,623 |  |  | (21,778 | ) |  | 1,845 |
Total intangible assets | $ | 47,613 |  |  | $ | (16,376 | ) |  | $ | 31,237 |  |  | $ | 69,803 |  |  | $ | (36,473 | ) |  | $ | 33,330 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense |
| (Dollars in thousands)
Year 1 | $ | 3,291 |
Year 2 | 3,202 |
Year 3 | 2,981 |
Year 4 | 2,900 |
Year 5 | 2,705 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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