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Investments in Companies Accounted for Using the Equity Method (Details) - USD ($) | 1 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Jul. 31, 2019 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Equity Method Investments |  |  |  |  |
Equity method investment (loss) income, net of tax |  |  | $ (2,453,000) | $ 4,589,000 | $ (10,481,000)
Carrying value of investment |  |  | 18,644,000 | 15,433,000 |
Limited Partnership Fund |  |  |  |  |
Equity Method Investments |  |  |  |  |
Capital contributions |  |  |  | 10,000,000 | 10,000,000
Contribution commitments |  |  |  | 0 |
Limited Partnership Fund | Equity method investment loss, net of tax |  |  |  |  |
Equity Method Investments |  |  |  |  |
Equity method investment (loss) income, net of tax |  |  | (2,453,000) | 5,889,000 | 49,000
Income tax expense from equity method investments |  |  | 0 | 1,300,000 | 11
Limited Partnership Fund | Long term investments |  |  |  |  |
Equity Method Investments |  |  |  |  |
Carrying value of investment |  |  | 18,644,000 | 15,433,000 |
Limited Partnership Fund, Technologies and Start-Up |  |  |  |  |
Equity Method Investments |  |  |  |  |
Capital contributions | $ 20,000,000 |  | $ 5,778,000 |  |
Expected years contributions will be made | 5 years |  |  |  |
Additional capital contributions |  | $ 14,222,000 |  |  |
HAPSMobile |  |  |  |  |
Equity Method Investments |  |  |  |  |
Equity method investment (loss) income, net of tax |  |  |  | $ 0 | $ 10,530,000

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