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Investments in Companies Accounted for Using the Equity Method - Investment in Limited Partnership Fund (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Equity Method Investments        
Equity method investment loss, net of tax   $ (5,487) $ (3,944) $ (1,283)
Provision for income taxes   5,848 4,641 9,800
Carrying value of investment   4,442    
Limited Partnership Fund        
Equity Method Investments        
Capital contributions $ 5,000      
Equity method investment loss, net of tax 394      
Provision for income taxes 111      
Summarized financial information of the equity method investments        
Current assets   67,387 31,746  
Noncurrent assets   170,602    
Current liabilities   72,505 11,757  
Revenue   25    
Gross loss   (1,331)    
Realized and unrealized losses on investments   (7,028)    
Net loss   $ (85,818) $ (63,107) $ (25,666)
Limited Partnership Fund | Long term investments        
Equity Method Investments        
Carrying value of investment $ 4,442