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Investments in Companies Accounted for Using the Equity Methods - Investment in Limited Partnership Fund (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2022
Mar. 31, 2022
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments            
Equity method investment (loss) income, net of tax     $ (1,674) $ (2,453) $ 4,589  
Carrying value of investment     19,933 18,644    
Limited Partnership Fund            
Equity Method Investments            
Capital contributions         10,000 $ 10,000
Expected years contributions will be made 3 months          
Additional capital contributions $ 11,126          
Limited Partnership Fund | Equity method investment loss, net of tax            
Equity Method Investments            
Equity method investment (loss) income, net of tax     (1,782) (2,453) 5,889  
Income tax expense from equity method investments     0 0 $ 1,300  
Limited Partnership Fund | Long term investments            
Equity Method Investments            
Carrying value of investment     19,933 18,644    
Limited Partnership Fund, Technologies and Start-Up            
Equity Method Investments            
Capital contributions   $ 20,000 $ 3,074 $ 5,778    
Expected years contributions will be made   5 years