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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill were as follows ($000):
|  | Year Ended June 30, 2019 |  |  |  |
|  | Compound Semiconductors |  | Photonic Solutions |  | Total
Balance-beginning of period |  | $ | 161,008 |  |  | $ | 109,670 |  |  | $ | 270,678 |
Goodwill acquired |  | 25,569 |  |  | 26,069 |  |  | 51,638 |
Foreign currency translation |  | (856) |  |  | (1,682) |  |  | (2,538) |
Balance-end of period |  | $ | 185,721 |  |  | $ | 134,057 |  |  | $ | 319,778 |
|  | Year Ended June 30, 2018 |  |  |  |
|  | Compound Semiconductors |  | Photonic Solutions |  | Total
Balance-beginning of period |  | $ | 141,798 |  |  | $ | 108,544 |  |  | $ | 250,342 |
Goodwill acquired |  | 18,956 |  |  | — |  |  | 18,956 |
Goodwill adjustment for prior year acquisition - IPI |  | — |  |  | 407 |  |  | 407 |
Foreign currency translation |  | 254 |  |  | 719 |  |  | 973 |
Balance-end of period |  | $ | 161,008 |  |  | $ | 109,670 |  |  | $ | 270,678 |
Gross Carrying Amount and Accumulated Amortization of Intangible Assets Other Than Goodwill | The gross carrying amount and accumulated amortization of the Company’s intangible assets other than goodwill as of June 30, 2019 and 2018 were as follows ($000):
|  | June 30, 2019 |  |  |  |  |  | June 30, 2018 |  |  |  |
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Technology and Patents |  | $ | 91,637 |  |  | $ | (39,679) |  |  | $ | 51,958 |  |  | $ | 66,812 |  |  | $ | (32,979) |  |  | $ | 33,833 |
Trade Names |  | 15,759 |  |  | (1,601) |  |  | 14,158 |  |  | 15,882 |  |  | (1,471) |  |  | 14,411 |
Customer Lists |  | 132,872 |  |  | (59,664) |  |  | 73,208 |  |  | 127,603 |  |  | (50,792) |  |  | 76,811 |
Other |  | 1,572 |  |  | (1,572) |  |  | — |  |  | 1,573 |  |  | (1,559) |  |  | 14 |
Total |  | $ | 241,840 |  |  | $ | (102,516) |  |  | $ | 139,324 |  |  | $ | 211,870 |  |  | $ | (86,801) |  |  | $ | 125,069 |
Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Years | The estimated amortization expense for existing intangible assets for each of the five succeeding years is as follows $0:
Year Ending June 30, |
2020 | $ | 16,700 |
2021 | 16,300 |
2022 | 14,800 |
2023 | 14,400 |
2024 | 14,000 |

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