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Investments (Details) - USD ($)
$ in Thousands
Jan. 27, 2024
Apr. 30, 2023
Long-term investments:    
Total long-term available-for-sale securities investments $ 2,260 $ 4,969
Equity Method Investments. 19,022 18,644
Total long-term investments 21,282 23,613
Equity securities and warrants    
Long-term investments:    
Total long-term investments 2,260 $ 4,969
Investment, Type [Extensible Enumeration]   us-gaap:DebtSecuritiesMember
Investment in limited partnership fund    
Long-term investments:    
Equity Method Investments. $ 19,022 $ 18,644