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Equity Method Investments - Investment in Limited Partnership Fund (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2022 | Jul. 31, 2019 | Nov. 01, 2025 | Oct. 26, 2024 | Nov. 01, 2025 | Oct. 26, 2024 | Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment gain (loss), net of tax |  |  | $ 1,196,000 | $ 990,000 | $ 2,983,000 | $ 1,055,000 |  |  |  |  |
Limited Partnership Fund |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000
Contribution commitments |  |  |  |  |  |  |  |  |  | $ 0 |
Equity method investment gain (loss), net of tax |  |  | 1,196,000 | 1,001,000 | 2,983,000 | 1,066,000 |  |  |  |  |
Carrying value of equity method investments |  |  | 35,687,000 |  | 35,687,000 |  | $ 30,423,000 |  |  |  |
Limited Partnership Fund | Equity method investment loss, net of tax |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Income tax expense from equity method investments |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |
Limited Partnership Fund, Technologies and Start-Up |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Capital contributions | $ 20,000,000 |  | $ 2,123,000 |  |  |  | $ 5,674,000 | $ 3,074,000 | $ 5,778,000 |  |
Expected years contributions will be made | 5 years |  |  |  |  |  |  |  |  |  |
Additional capital contributions |  | $ 3,351,000 |  |  |  |  |  |  |  |  |

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