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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, 2022
Apr. 30, 2021
Apr. 30, 2020
Equity Method Investments      
Current assets $ 368,909 $ 401,638  
Noncurrent assets 1,932 10,440  
Current liabilities 101,391 96,185  
Gross loss 141,236 164,558 $ 153,102
Net (loss) income (4,185) 23,345 41,070
Limited Partnership Fund.      
Equity Method Investments      
Current assets 3,243 9,106  
Noncurrent assets 140,178 65,717  
Current liabilities 683 76,492  
Revenue 187 159 25
Gross loss (13,113) (1,241) (1,331)
Realized and unrealized losses on investments 63,314 (131,971) (7,028)
Net (loss) income $ 40,349 $ (190,454) $ (85,818)