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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. 29, 2023
Jul. 30, 2022
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments              
Equity method investment loss, net of tax     $ (21,000) $ (500,000)      
Carrying value of investment     18,623,000   $ 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     (21,000) (500,000)      
Income tax expense from equity method investments     0 $ 0      
Limited Partnership Fund | Long term investments              
Equity Method Investments              
Carrying value of investment     18,623,000   18,644,000    
Limited Partnership Fund, Technologies and Start-Up              
Equity Method Investments              
Capital contributions $ 20,000,000   $ 0   $ 5,778,000    
Expected years contributions will be made 5 years            
Additional capital contributions   $ 14,222,000