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Intangible Assets | 12 Months Ended
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Apr. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 10. 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.
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 $21.0 million, $20.1 million, and $10.7 million for the fiscal years ended April 30, 2018, 2017, and 2016, respectively. 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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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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