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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