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Investments - Equity Securities (Details) - Equity securities and warrants - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2024 | Apr. 30, 2023
Debt Securities, Available-for-Sale [Line Items] |  |
Net loss recognized during the period on equity securities | $ (3,945) | $ (132)
Unrealized loss recognized during the period on equity securities still held at the reporting date | $ (3,945) | $ (132)

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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