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Investments (Details) - USD ($) $ in Thousands | Jan. 28, 2023 | Apr. 30, 2022
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Short-term investments: |  |
Total short-term investments |  | $ 24,716
Long-term investments: |  |
Equity Method Investments. | $ 16,017 | 15,433
Total long-term investments | 19,319 | 15,433
Investment in limited partnership fund |  |
Long-term investments: |  |
Equity Method Investments. | 16,017 | 15,433
Available-for-sale securities. |  |
Short-term investments: |  |
Total short-term investments |  | 24,716
Long-term investments: |  |
Total long-term investments | 3,302 |
Available-for-sale securities. | Municipal securities |  |
Short-term investments: |  |
Total short-term investments |  | 19,725
Available-for-sale securities. | U.S. government securities |  |
Short-term investments: |  |
Total short-term investments |  | $ 4,991
Available-for-sale securities. | Equity securities and warrants |  |
Long-term investments: |  |
Total long-term investments | $ 3,302 |

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