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Intangibles, net | 12 Months Ended
--- | ---
Apr. 30, 2023
Intangibles, net |
Intangibles, net | 5. Intangibles, net ​ The components of intangibles are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, | ​ | April 30, | ​
​ |  | 2023 |  | 2022 | ​
Technology | ​ | $ | 60,817 | ​ | $ | 56,913 | ​
Licenses | ​ | ​ | 1,008 | ​ | ​ | 1,008 | ​
Customer relationships | ​ | ​ | 72,645 | ​ | ​ | 72,448 | ​
Backlog | ​ | ​ | 2,895 | ​ | ​ | 2,100 | ​
In-process research and development | ​ | ​ | 550 | ​ | ​ | 550 | ​
Non-compete agreements | ​ | ​ | 320 | ​ | ​ | 320 | ​
Trademarks and tradenames | ​ | ​ | 68 | ​ | ​ | 68 | ​
Other | ​ | ​ | 150 | ​ | ​ | 144 | ​
Intangibles, gross | ​ | ​ | 138,453 | ​ | ​ | 133,551 | ​
Less accumulated amortization | ​ |  | (94,876) | ​ |  | (36,327) | ​
Intangibles, net | ​ | $ | 43,577 | ​ | $ | 97,224 | ​
​ The Company tests identifiable intangible assets and goodwill for impairment in the fourth quarter of each fiscal year unless there are interim indicators that suggest that it is more likely than not that either the identifiable intangible assets or goodwill may be impaired. The weighted average amortization period at April 30, 2023 and 2022 was four years, respectively. Amortization expense for the years ended April 30, 2023, 2022 and 2021 was $58,121,000, $26,558,000 and $6,469,000, respectively. Due to the closure of all of the Company’s MUAS COCO sites during the three months ended April 30, 2023, we revised the estimated useful life for MUAS customer relationships which resulted in accelerated intangible amortization expenses of $34,149,000 during the fiscal year ended April 30, 2023. ​ Technology and backlog intangible assets were recognized in conjunction with the Company’s acquisition of Planck on August 17, 2022. Technology, backlog and customer relationship intangible assets were recognized in conjunction with the Company’s acquisition of Telerob on May 3, 2021. Technology and customer relationship intangible assets were recognized in conjunction with the Company’s acquisition of Arcturus on February 19, 2021. Technology and customer relationship intangible assets were recognized in conjunction with the Company’s acquisition of ISG on February 23, 2021. Refer to Note 21—Business Acquisitions for further details. ​ Estimated amortization expense for the next five years is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
​ |  | Year ending |
​ | ​ | April 30, |
2024 | ​ | $ | 11,821 | ​
2025 | ​ |  | 9,494 | ​
2026 | ​ |  | 6,857 | ​
2027 | ​ |  | 5,786 | ​
2028 | ​ |  | 5,175 | ​
​ | ​ | $ | 39,133 | ​
​

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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