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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying value of goodwill by segment | The changes in the carrying amount of goodwill by segment are as follows:
|  | Electrical Infrastructure |  | Oil Gas & Chemical |  | Storage Solutions |  | Industrial |  | Total
|  | (In thousands)
Net balance at June 30, 2015 |  | $ | 42,374 |  |  | $ | 14,008 |  |  | $ | 9,664 |  |  | $ | 5,472 |  |  | $ | 71,518 |
Purchase of BTE (Note 2) |  | — |  |  | — |  |  | 6,942 |  |  | — |  |  | 6,942 |
Translation adjustment (1) |  | (204 | ) |  | — |  |  | 75 |  |  | (38 | ) |  | (167 | )
Net balance at June 30, 2016 |  | 42,170 |  |  | 14,008 |  |  | 16,681 |  |  | 5,434 |  |  | 78,293 |
Purchase of Houston Interests (Note 2) |  | — |  |  | 19,596 |  |  | — |  |  | 15,550 |  |  | 35,146 |
Acquisition related adjustments |  | — |  |  | — |  |  | 88 |  |  | — |  |  | 88 |
Translation adjustment (1) |  | (18 | ) |  | — |  |  | (5 | ) |  | (3 | ) |  | (26 | )
Net balance at June 30, 2017 |  | 42,152 |  |  | 33,604 |  |  | 16,764 |  |  | 20,981 |  |  | 113,501 |
Goodwill impairment |  | (17,281 | ) |  | — |  |  | — |  |  | — |  |  | (17,281 | )
Translation adjustment (1) |  | (45 | ) |  | — |  |  | (4 | ) |  | (9 | ) |  | (58 | )
Net balance at June 30, 2018 |  | $ | 24,826 |  |  | $ | 33,604 |  |  | $ | 16,760 |  |  | $ | 20,972 |  |  | $ | 96,162 |
Carrying value of other intangible assets | Information on the carrying value of other intangible assets is as follows:
|  |  |  | At June 30, 2018
|  | Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
|  | (Years) |  | (In thousands)
Intellectual property |  | 9 to 15 |  | $ | 2,579 |  |  | $ | (1,603 | ) |  | $ | 976 |
Customer based |  | 6 to 15 |  | 38,562 |  |  | (16,763 | ) |  | 21,799 |
Non-compete Agreements |  | 4 |  | 1,453 |  |  | (1,414 | ) |  | 39 |
Trade names |  | — |  | 1,630 |  |  | (1,630 | ) |  | — |
Total other intangible assets |  |  |  | $ | 44,224 |  |  | $ | (21,410 | ) |  | $ | 22,814 |
|  |  |  | At June 30, 2017
|  | Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
|  | (Years) |  | (In thousands)
Intellectual property |  | 9 to 15 |  | $ | 2,579 |  |  | $ | (1,425 | ) |  | $ | 1,154 |
Customer based |  | 1 to 15 |  | 38,207 |  |  | (13,543 | ) |  | 24,664 |
Non-compete agreements |  | 4 to 5 |  | 1,453 |  |  | (1,298 | ) |  | 155 |
Trade name |  | 1 to 3 |  | 1,630 |  |  | (1,307 | ) |  | 323 |
Total other intangible assets |  |  |  | $ | 43,869 |  |  | $ | (17,573 | ) |  | $ | 26,296 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Amortization expense totaled $4.8 million, $4.9 million, and $3.6 million in fiscal 2018, 2017, and 2016, respectively. We estimate that future amortization of other intangible assets will be as follows (in thousands):
For year ending: |
June 30, 2019 | $ | 3,699 |
June 30, 2020 | 3,688 |
June 30, 2021 | 3,669 |
June 30, 2022 | 2,821 |
June 30, 2023 | 2,369 |
Thereafter | 6,568 |
Total estimated amortization expense | $ | 22,814 |

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