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Equity Method Investments - Investment in Limited Partnership Fund (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2022
Jul. 31, 2019
Jul. 27, 2024
Jul. 29, 2023
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments                
Equity method investment income (loss), net of tax     $ 65,000 $ (21,000)        
Carrying value of investment     21,181,000   $ 19,933,000      
Limited Partnership Fund                
Equity Method Investments                
Capital contributions             $ 10,000,000 $ 10,000,000
Expected years contributions will be made   3 years            
Limited Partnership Fund | Equity method investment loss, net of tax                
Equity Method Investments                
Equity method investment income (loss), net of tax     65,000 $ (21,000)        
Income tax expense from equity method investments     0          
Limited Partnership Fund | Long term investments                
Equity Method Investments                
Carrying value of investment     21,181,000   19,933,000      
Limited Partnership Fund, Technologies and Start-Up                
Equity Method Investments                
Capital contributions $ 20,000,000   $ 1,183,000   $ 3,074,000 $ 5,778,000    
Expected years contributions will be made 5 years              
Additional capital contributions   $ 9,965,000