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Investments in Companies Accounted for Using the Equity Method - Summarized financial information of equity method investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Method Investments      
Current assets $ 477,002 $ 368,909  
Noncurrent assets 5,220 1,932  
Current liabilities 121,334 101,391  
Gross margin 173,514 141,236 $ 164,558
Net (loss) income (176,167) (4,185) 23,345
Limited Partnership Fund.      
Equity Method Investments      
Current assets 1,908 3,243  
Noncurrent assets 132,198 140,178  
Current liabilities 1,691 683  
Revenues 3,788 187 159
Gross margin 1,607 (13,113) (1,241)
Realized and unrealized (losses) gains on investments (23,967) 63,314 (131,971)
Net (loss) income $ (22,585) $ 40,349 $ (190,454)