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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. 27, 2024
Jan. 28, 2023
Jan. 27, 2024
Jan. 28, 2023
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments                  
Equity method investment loss, net of tax     $ (80,000) $ (417,000) $ (1,494,000) $ (2,190,000)      
Carrying value of investment     19,022,000   19,022,000   $ 18,644,000    
Limited Partnership Fund                  
Equity Method Investments                  
Capital contributions               $ 10,000,000 $ 10,000,000
Contribution commitments               $ 0  
Limited Partnership Fund | Equity method investment loss, net of tax                  
Equity Method Investments                  
Equity method investment loss, net of tax     (80,000) (417,000) (1,494,000) (2,190,000)      
Income tax expense from equity method investments     0   0        
Limited Partnership Fund | Long term investments                  
Equity Method Investments                  
Carrying value of investment     19,022,000   $ 19,022,000   18,644,000    
Limited Partnership Fund, Technologies and Start-Up                  
Equity Method Investments                  
Capital contributions $ 20,000,000   $ 1,875,000       $ 5,778,000    
Expected years contributions will be made 5 years                
Additional capital contributions   $ 12,347,000              
Limited Partnership Fund, Technologies and Start-Up | Equity method investment loss, net of tax                  
Equity Method Investments                  
Income tax expense from equity method investments       $ 0   $ 0