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Equity Method Investments - Investment in Limited Partnership Fund (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Jul. 31, 2019
Jan. 25, 2025
Jan. 27, 2024
Jan. 25, 2025
Jan. 27, 2024
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments                    
Equity method investment (loss) income, net of tax       $ (80,000) $ 1,055,000 $ (1,494,000)        
Carrying value of investment     $ 23,308,000   23,308,000   $ 19,933,000      
Limited Partnership Fund                    
Equity Method Investments                    
Capital contributions                 $ 10,000,000 $ 10,000,000
Contribution commitments                 $ 0  
Expected years contributions will be made   3 years                
Equity method investment (loss) income, net of tax     0   1,066,000          
Carrying value of investment     23,308,000   23,308,000   19,933,000      
Limited Partnership Fund | Equity method investment loss, net of tax                    
Equity Method Investments                    
Income tax expense from equity method investments     0 0 0 0        
Equity method investment (loss) income       $ (80,000)   $ (1,494,000)        
Limited Partnership Fund, Technologies and Start-Up                    
Equity Method Investments                    
Capital contributions $ 20,000,000   $ 1,126,000   $ 2,309,000   $ 3,074,000 $ 5,778,000    
Expected years contributions will be made 5 years                  
Additional capital contributions   $ 8,839,000