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Investments in Companies Accounted for Using the Equity Method - Investment in Limited Partnership Fund (Details) - USD ($)
1 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2022
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Equity Method Investments          
Equity method investment gain (loss), net of tax   $ 4,837,000 $ (1,674,000) $ (2,453,000)  
Carrying value of investment   30,423,000 19,933,000    
Limited Partnership Fund          
Equity Method Investments          
Capital contributions         $ 10,000,000
Expected years contributions will be made 2 years        
Additional capital contributions $ 5,474,000        
Limited Partnership Fund | Equity method investment loss, net of tax          
Equity Method Investments          
Equity method investment gain (loss), net of tax   4,816,000 (1,782,000) (2,453,000)  
Income tax expense from equity method investments   0 0 0  
Limited Partnership Fund | Long term investments          
Equity Method Investments          
Carrying value of investment   30,423,000 19,933,000    
Limited Partnership Fund, Technologies and Start-Up          
Equity Method Investments          
Capital contributions $ 20,000,000 $ 5,674,000 $ 3,074,000 $ 5,778,000  
Expected years contributions will be made 5 years