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Goodwill and Other Intangible Assets (Notes) | 6 Months Ended
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Feb. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets Disclosure [Text Block] | Goodwill and Other Intangible Assets Goodwill of $153.8 million and $154.1 million as of February 28, 2018, and August 31, 2017, respectively, is included in other assets on our Consolidated Balance Sheets. Changes in the net carrying amount of goodwill for the six months ended February 28, 2018, by segment, are as follows:
| 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 |
No goodwill has been allocated to our Nitrogen Production segment, which consists of an investment accounted for under the equity method. Intangible assets subject to amortization primarily include customer lists, trademarks and non-compete agreements, and are amortized over their respective useful lives (ranging from 2 to 30 years). Information regarding intangible assets that are included in other assets on our Consolidated Balance Sheets is as follows:
| 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 |
Total amortization expense for intangible assets during the three and six months ended February 28, 2018, was $0.8 million and $1.7 million, respectively. Total amortization expense for intangible assets during the three and six months ended February 28, 2017, was $1.0 million and $2.3 million, respectively. The estimated annual amortization expense related to intangible assets subject to amortization for the next five years is as follows:
| (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 The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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