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Intangible Assets | 12 Months Ended
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Apr. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 10. Intangible Assets The following table presents a summary of intangible assets as of April 30, 2017 and 2016 (in thousands):
|  | April 30, 2017 |  |  | April 30, 2016 |
|  | Gross |  |  |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ |  | 105,260 |  |  | $ |  | (16,463 | ) |  | $ |  | 88,797 |  |  | $ |  | 28,560 |  |  | $ |  | (6,423 | ) |  | $ |  | 22,137 |
Developed technology |  |  |  | 19,430 |  |  |  |  | (5,436 | ) |  |  |  | 13,994 |  |  |  |  | 16,430 |  |  |  |  | (2,890 | ) |  |  |  | 13,540 |
Patents, trademarks, and trade names |  |  |  | 53,308 |  |  |  |  | (15,619 | ) |  |  |  | 37,689 |  |  |  |  | 36,076 |  |  |  |  | (9,262 | ) |  |  |  | 26,814 |
Backlog |  |  |  | 1,150 |  |  |  |  | (1,150 | ) |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
|  |  |  | 179,148 |  |  |  |  | (38,668 | ) |  |  |  | 140,480 |  |  |  |  | 81,066 |  |  |  |  | (18,575 | ) |  |  |  | 62,491 |
Patents in progress |  |  |  | 611 |  |  |  |  | — |  |  |  |  | 611 |  |  |  |  | 433 |  |  |  |  | — |  |  |  |  | 433 |
Total definite-lived intangible assets |  |  |  | 179,759 |  |  |  |  | (38,668 | ) |  |  |  | 141,091 |  |  |  |  | 81,499 |  |  |  |  | (18,575 | ) |  |  |  | 62,924 |
Indefinite-lived intangible assets |  |  |  | 226 |  |  |  |  | — |  |  |  |  | 226 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Total intangible assets |  | $ |  | 179,985 |  |  | $ |  | (38,668 | ) |  | $ |  | 141,317 |  |  | $ |  | 81,499 |  |  | $ |  | (18,575 | ) |  | $ |  | 62,924 |
We amortize intangible assets with determinable lives over a weighted-average period of approximately five years. The weighted-average periods of amortization by intangible asset class is approximately five years for customer relationships, six years for developed technology, and five years for patents, trademarks, and trade names. Amortization expense, excluding amortization of deferred financing costs, amounted to $20.1 million, $10.7 million, and $4.6 million for the fiscal years ended April 30, 2017, 2016, and 2015, respectively. The following table represents future expected amortization expense as of April 30, 2017, which will primarily be recorded in our Outdoor Products & Accessories segment (in thousands):
Fiscal |  |  | Amount |
2018 |  | $ |  | 22,937 |
2019 |  |  |  | 23,199 |
2020 |  |  |  | 20,367 |
2021 |  |  |  | 17,552 |
2022 |  |  |  | 14,836 |
Thereafter |  |  |  | 41,589 |
Total |  | $ |  | 140,480 |

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