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Intangible Assets (Tables) | 12 Months Ended
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Apr. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Intangible Assets | The following table presents a summary of intangible assets as of April 30, 2018 and 2017 (in thousands):
|  | April 30, 2018 |  |  | April 30, 2017 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships (a) |  | $ | 92,360 |  |  | $ | (28,252 | ) |  | $ | 64,108 |  |  | $ | 105,260 |  |  | $ | (16,463 | ) |  | $ | 88,797 |
Developed technology |  |  | 21,130 |  |  |  | (8,178 | ) |  |  | 12,952 |  |  |  | 19,430 |  |  |  | (5,436 | ) |  |  | 13,994 |
Patents, trademarks, and trade names |  |  | 56,718 |  |  |  | (22,099 | ) |  |  | 34,619 |  |  |  | 53,308 |  |  |  | (15,619 | ) |  |  | 37,689 |
Backlog |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |  |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |
|  |  | 171,358 |  |  |  | (59,679 | ) |  |  | 111,679 |  |  |  | 179,148 |  |  |  | (38,668 | ) |  |  | 140,480 |
Patents in progress |  |  | 855 |  |  |  | — |  |  |  | 855 |  |  |  | 611 |  |  |  | — |  |  |  | 611 |
Total definite-lived intangible assets |  |  | 172,213 |  |  |  | (59,679 | ) |  |  | 112,534 |  |  |  | 179,759 |  |  |  | (38,668 | ) |  |  | 141,091 |
Indefinite-lived intangible assets |  |  | 226 |  |  |  | — |  |  |  | 226 |  |  |  | 226 |  |  |  | — |  |  |  | 226 |
Total intangible assets |  | $ | 172,439 |  |  | $ | (59,679 | ) |  | $ | 112,760 |  |  | $ | 179,985 |  |  | $ | (38,668 | ) |  | $ | 141,317 |
(a) | Changes to the gross carrying amount of customer relationships is related to purchase accounting adjustments. For more information regarding the changes in valuation of customer relations, see Note 2 — Acquisitions to our consolidated financial statements.
Schedule of Future Expected Amortization Expense | The following table represents future expected amortization expense as of April 30, 2018, which will primarily be recorded in our Outdoor Products & Accessories segment (in thousands):
Fiscal |  | Amount |
2019 |  | $ | 21,971 |
2020 |  |  | 19,095 |
2021 |  |  | 16,488 |
2022 |  |  | 14,109 |
2023 |  |  | 11,747 |
Thereafter |  |  | 28,269 |
Total |  | $ | 111,679 |

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