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Intangibles, net | 6 Months Ended
--- | ---
Oct. 30, 2021
Intangibles, net |
Intangibles, net | 8. Intangibles, net ​ The components of intangibles are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | October 30, | ​ | April 30, | ​
​ |  | 2021 |  | 2021 | ​
Technology | ​ | $ | 57,887 | ​ | $ | 46,850 | ​
Licenses | ​ | ​ | 1,008 | ​ | ​ | 1,008 | ​
Customer relationships | ​ | ​ | 72,872 | ​ | ​ | 68,073 | ​
Backlog | ​ | ​ | 2,303 | ​ | ​ | — | ​
In-process research and development | ​ | ​ | 550 | ​ | ​ | 550 | ​
Non-compete agreements | ​ | ​ | 320 | ​ | ​ | 320 | ​
Trademarks and tradenames | ​ | ​ | 68 | ​ | ​ | 68 | ​
Other | ​ | ​ | 105 | ​ | ​ | 3 | ​
Intangibles, gross | ​ | ​ | 135,113 | ​ | ​ | 116,872 | ​
Less accumulated amortization | ​ |  | (24,493) | ​ |  | (10,604) | ​
Intangibles, net | ​ | $ | 110,620 | ​ | $ | 106,268 | ​
​ The weighted average amortization period at October 30, 2021 and April 30, 2021 was five years, respectively. Amortization expense for the three and six months ended October 30, 2021 was $6,843,000 and $13,816,000, respectively. Amortization expense for the three and six months ended October 31, 2020 was $715,000 and $1,424,000, respectively. ​ 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 18—Business Acquisitions for further details. ​ Estimated amortization expense for the next five years is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
​ |  | Year ending |
​ | ​ | April 30, |
2022 | ​ | $ | 15,131 | ​
2023 | ​ |  | 27,719 | ​
2024 | ​ |  | 26,870 | ​
2025 | ​ |  | 18,156 | ​
2026 | ​ |  | 13,114 | ​
​ | ​ | $ | 100,990 | ​
​

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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 http://asc.fasb.org/topic&trid=2144416 + Details
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