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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

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