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Investments (Details) - USD ($) $ in Thousands | Jul. 27, 2019 | Apr. 30, 2019
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Short-term investments: |  |
Total held-to-maturity and short-term investments | $ 163,634 | $ 150,487
Long-term investments: |  |
Total long-term investments | 4,887 | 9,386
Held to maturity securities |  |
Long-term investments: |  |
Total long-term investments | 2,194 | 9,386
Held to maturity securities | Municipal securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 7,873 | 5,332
Held to maturity securities | U.S. government securities |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 81,689 | 63,205
Long-term investments: |  |
Total long-term investments | 1,006 | 7,404
Held to maturity securities | Corporate bonds |  |
Short-term investments: |  |
Total held-to-maturity and short-term investments | 74,072 | 81,950
Long-term investments: |  |
Total long-term investments | 1,188 | $ 1,982
Available-for-sale securities |  |
Long-term investments: |  |
Total long-term investments | 2,693 |
Available-for-sale securities | Auction rate securities |  |
Long-term investments: |  |
Total long-term investments | $ 2,693 |

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