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Investments (Details) - USD ($) $ in Thousands | Jan. 25, 2020 | Apr. 30, 2019
--- | --- | ---
Short-term investments: |  |
Total held-to-maturity and short-term investments | $ 148,502 | $ 150,487
Long-term investments: |  |
Total long-term investments | 26,409 | 9,386
Held to maturity securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 135,302 | 150,487
Long-term investments: |  |
Total long-term investments | 21,462 | 9,386
Held to maturity securities | Municipal securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 7,565 | 5,332
Long-term investments: |  |
Total long-term investments | 15,887 |
Held to maturity securities | U.S. government securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 45,439 | 63,205
Long-term investments: |  |
Total long-term investments |  | 7,404
Held to maturity securities | Corporate bonds |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 82,298 | 81,950
Long-term investments: |  |
Total long-term investments | 4,558 | $ 1,982
Held to maturity securities | Certificates of deposit |  |
Long-term investments: |  |
Total long-term investments | 1,017 |
Available-for-sale securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 13,200 |
Long-term investments: |  |
Total long-term investments | 4,947 |
Available-for-sale securities | Investment in limited partnership fund |  |
Long-term investments: |  |
Total long-term investments | 4,947 |
Available-for-sale securities | Variable rate demand notes |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | $ 13,200 |

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