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Intangible Assets | 12 Months Ended
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Apr. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes intangible assets as of April 30, 2025 and 2024 (in thousands):
|  | April 30, 2025 |  | April 30, 2024
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships |  | $ | 89,980 |  |  | $ | (82,623) |  |  | $ | 7,357 |  |  | $ | 89,980 |  |  | $ | (78,877) |  |  | $ | 11,103 |
Developed software and technology |  | 28,155 |  |  | (22,238) |  |  | 5,917 |  |  | 27,762 |  |  | (20,250) |  |  | 7,512 |
Patents, trademarks, and trade names |  | 70,060 |  |  | (53,966) |  |  | 16,094 |  |  | 69,497 |  |  | (50,046) |  |  | 19,451 |
|  | 188,195 |  |  | (158,826) |  |  | 29,368 |  |  | 187,239 |  |  | (149,173) |  |  | 38,066 |
Patents and software in development |  | 1,612 |  |  | — |  |  | 1,612 |  |  | 1,721 |  |  | — |  |  | 1,721 |
Total definite-lived intangible assets |  | 189,807 |  |  | (158,826) |  |  | 30,981 |  |  | 188,960 |  |  | (149,173) |  |  | 39,787 |
Indefinite-lived intangible assets |  | 430 |  |  | — |  |  | 430 |  |  | 430 |  |  | — |  |  | 430 |
Total intangible assets |  | $ | 190,237 |  |  | $ | (158,826) |  |  | $ | 31,411 |  |  | $ | 189,390 |  |  | $ | (149,173) |  |  | $ | 40,217 |
We amortize definite-lived 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 software and technology, and six years for patents, trademarks, and trade na mes. Amortization expense amounted to $9.8 million, $13.1 million, and $13.7 million for the fiscal years ended April 30, 2025, 2024, and 2023, respectively. The following table represents future expected amortization expense as of April 30, 2025 (in thousands):
Fiscal |  | Amount
2026 |  | $ | 8,481 |
2027 |  | 6,093 |
2028 |  | 4,645 |
2029 |  | 2,975 |
2030 |  | 2,336 |
Thereafter |  | 4,838 |
Total |  | $ | 29,368 |
We did not record any impairment charges for long-lived intangible assets in the fiscal years ended April 30, 2025, 2024, and 2023, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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