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Intangible Assets (Tables) | 3 Months Ended
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Jul. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Intangible Assets | The following table presents a summary of intangible assets as of July 31, 2018 and April 30, 2018 (in thousands):
|  | July 31, 2018 |  |  | April 30, 2018 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ | 92,360 |  |  | $ | (30,719 | ) |  | $ | 61,641 |  |  | $ | 92,360 |  |  | $ | (28,252 | ) |  | $ | 64,108 |
Developed technology |  |  | 21,130 |  |  |  | (9,461 | ) |  |  | 11,669 |  |  |  | 21,130 |  |  |  | (8,178 | ) |  |  | 12,952 |
Patents, trademarks, and trade names |  |  | 56,879 |  |  |  | (23,840 | ) |  |  | 33,039 |  |  |  | 56,718 |  |  |  | (22,099 | ) |  |  | 34,619 |
Backlog |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |  |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |
|  |  | 171,519 |  |  |  | (65,170 | ) |  |  | 106,349 |  |  |  | 171,358 |  |  |  | (59,679 | ) |  |  | 111,679 |
Patents in progress |  |  | 879 |  |  |  | — |  |  |  | 879 |  |  |  | 855 |  |  |  | — |  |  |  | 855 |
Total definite-lived intangible assets |  |  | 172,398 |  |  |  | (65,170 | ) |  |  | 107,228 |  |  |  | 172,213 |  |  |  | (59,679 | ) |  |  | 112,534 |
Indefinite-lived intangible assets |  |  | 226 |  |  |  | — |  |  |  | 226 |  |  |  | 226 |  |  |  | — |  |  |  | 226 |
Total intangible assets |  | $ | 172,624 |  |  | $ | (65,170 | ) |  | $ | 107,454 |  |  | $ | 172,439 |  |  | $ | (59,679 | ) |  | $ | 112,760 |
Schedule of Future Expected Amortization Expense | Estimated amortization expense of intangible assets for the remainder of fiscal 2019 and succeeding fiscal years is as follows:
Fiscal |  | Amount |
2019 |  | $ | 16,449 |
2020 |  |  | 19,114 |
2021 |  |  | 16,506 |
2022 |  |  | 14,125 |
2023 |  |  | 11,762 |
Thereafter |  |  | 28,393 |
Total |  | $ | 106,349 |

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