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Investments (Details) - USD ($) $ in Thousands | Jan. 29, 2022 | Apr. 30, 2021
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Short-term investments: |  |
Total short-term investments | $ 3,969 | $ 31,971
Long-term investments: |  |
Equity Method Investments. | 12,388 | 7,168
Total long-term investments | 12,388 | 12,156
Investment in limited partnership fund |  |
Long-term investments: |  |
Equity Method Investments. | 12,388 | 7,168
Available-for-sale securities |  |
Short-term investments: |  |
Total short-term investments | 3,969 | 31,971
Long-term investments: |  |
Total long-term investments |  | 4,988
Available-for-sale securities | Municipal securities |  |
Short-term investments: |  |
Total short-term investments | $ 3,969 | 22,245
Long-term investments: |  |
Total long-term investments |  | 988
Available-for-sale securities | U.S. government securities |  |
Short-term investments: |  |
Total short-term investments |  | 4,009
Long-term investments: |  |
Total long-term investments |  | 4,000
Available-for-sale securities | Corporate bonds |  |
Short-term investments: |  |
Total short-term investments |  | $ 5,717

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