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Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2024 | Apr. 30, 2024 | Oct. 31, 2023
--- | --- | --- | ---
Cash equivalents: |  |  |
Amortized Cost | $ 121,274 | $ 167,146 | $ 149,009
Debt Securities, Available-for-Sale [Abstract] |  |  |
Total cash equivalents and available-for-sale marketable securities, Amortized Cost | 678,812 | 691,002 |
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain | 961 | 69 |
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss | (438) | (630) |
Total cash equivalents and available-for-sale marketable securities | 679,335 | 690,441 |
Money market funds |  |  |
Cash equivalents: |  |  |
Amortized Cost | 61,121 | 82,564 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 61,121 | 82,564 |
Commercial paper |  |  |
Cash equivalents: |  |  |
Amortized Cost | 8,115 | 18,769 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 8,115 | 18,769 |
Debt Securities, Available-for-Sale [Abstract] |  |  |
Amortized Cost | 113,959 | 162,183 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 113,959 | 162,183 |
U.S. treasury securities |  |  |
Cash equivalents: |  |  |
Amortized Cost | 999 | 5,888 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 999 | 5,888 |
Debt Securities, Available-for-Sale [Abstract] |  |  |
Amortized Cost | 13,328 | 2,497 |
Gross Unrealized Gains | 14 | 0 |
Gross Unrealized Losses | (1) | 0 |
Estimated Fair Value | 13,341 | 2,497 |
Corporate debt securities |  |  |
Debt Securities, Available-for-Sale [Abstract] |  |  |
Amortized Cost | 346,881 | 310,557 |
Gross Unrealized Gains | 826 | 64 |
Gross Unrealized Losses | (286) | (526) |
Estimated Fair Value | 347,421 | 310,095 |
Certificates of deposit |  |  |
Debt Securities, Available-for-Sale [Abstract] |  |  |
Amortized Cost | 68,715 | 62,017 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 68,715 | 62,017 |
U.S. government agencies securities |  |  |
Debt Securities, Available-for-Sale [Abstract] |  |  |
Amortized Cost | 65,694 | 46,527 |
Gross Unrealized Gains | 121 | 5 |
Gross Unrealized Losses | (151) | (104) |
Estimated Fair Value | $ 65,664 | $ 46,428 |

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