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Investments (Details) - USD ($) $ in Thousands | Oct. 26, 2019 | Apr. 30, 2019
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Short-term investments: |  |
Total held-to-maturity and short-term investments | $ 161,635 | $ 150,487
Long-term investments: |  |
Total long-term investments | 13,478 | 9,386
Held to maturity securities |  |
Long-term investments: |  |
Total long-term investments | 8,531 | 9,386
Held to maturity securities | Municipal securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 21,761 | 5,332
Long-term investments: |  |
Total long-term investments | 5,015 |
Held to maturity securities | U.S. government securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 65,826 | 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 | 74,048 | 81,950
Long-term investments: |  |
Total long-term investments | 2,495 | $ 1,982
Held to maturity securities | Certificates of deposit |  |
Long-term investments: |  |
Total long-term investments | 1,021 |
Available-for-sale securities |  |
Long-term investments: |  |
Total long-term investments | 4,947 |
Available-for-sale securities | Auction rate securities |  |
Long-term investments: |  |
Total long-term investments | $ 4,947 |

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