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Investments (Details) - USD ($)
$ in Thousands
Jan. 30, 2021
Apr. 30, 2020
Short-term investments:    
Total short-term investments $ 48,499 $ 47,507
Long-term investments:    
Equity Method Investments. 6,230 4,442
Total long-term investments 11,222 15,030
Investment in limited partnership fund    
Long-term investments:    
Equity Method Investments. 6,230 4,442
Available-for-sale securities    
Short-term investments:    
Total short-term investments 48,499 47,507
Long-term investments:    
Total long-term investments 4,992 10,588
Available-for-sale securities | Municipal securities    
Short-term investments:    
Total short-term investments 25,709 5,244
Long-term investments:    
Total long-term investments 989 1,592
Available-for-sale securities | U.S. government securities    
Short-term investments:    
Total short-term investments 13,019 33,771
Long-term investments:    
Total long-term investments 4,003 8,996
Available-for-sale securities | Corporate bonds    
Short-term investments:    
Total short-term investments $ 9,771 $ 8,492