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Investments (Details) - USD ($)
$ in Thousands
Jan. 25, 2025
Apr. 30, 2024
Long-term investments:    
Total long-term available-for-sale securities investments $ 2,214 $ 1,027
Equity Method Investments. 23,308 19,933
Total long-term investments 25,522 20,960
Equity securities and warrants    
Long-term investments:    
Total long-term investments $ 2,214 1,027
Investment, Type [Extensible Enumeration] us-gaap:DebtSecuritiesMember  
Investment in limited partnership funds    
Long-term investments:    
Equity Method Investments. $ 23,308 $ 19,933