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Cash Equivalents and Marketable Securities - Cash Equivalents and Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | --- | ---
Cash equivalents: |  |  |
Amortized Cost | $ 164,358 | $ 167,146 | $ 284,829
Available-for-sale marketable securities: |  |  |
Total cash equivalents and available-for-sale marketable securities, Amortized Cost | 695,816 | 691,002 |
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain | 663 | 69 |
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss | (140) | (630) |
Total cash equivalents and available-for-sale marketable securities | 696,339 | 690,441 |
Money market funds |  |  |
Cash equivalents: |  |  |
Amortized Cost | 87,872 | 82,564 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 87,872 | 82,564 |
Commercial paper |  |  |
Cash equivalents: |  |  |
Amortized Cost | 29,122 | 18,769 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 29,122 | 18,769 |
Available-for-sale marketable securities: |  |  |
Amortized Cost | 113,787 | 162,183 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 113,787 | 162,183 |
U.S. treasury securities |  |  |
Cash equivalents: |  |  |
Amortized Cost | 0 | 5,888 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 0 | 5,888 |
Available-for-sale marketable securities: |  |  |
Amortized Cost | 15,478 | 2,497 |
Gross Unrealized Gains | 4 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 15,482 | 2,497 |
Corporate debt securities |  |  |
Cash equivalents: |  |  |
Amortized Cost | 1,015 | 0 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 1,015 | 0 |
Available-for-sale marketable securities: |  |  |
Amortized Cost | 315,034 | 310,557 |
Gross Unrealized Gains | 502 | 64 |
Gross Unrealized Losses | (131) | (526) |
Estimated Fair Value | 315,405 | 310,095 |
Certificates of deposit |  |  |
Available-for-sale marketable securities: |  |  |
Amortized Cost | 76,518 | 62,017 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 76,518 | 62,017 |
U.S. government agencies securities |  |  |
Available-for-sale marketable securities: |  |  |
Amortized Cost | 56,990 | 46,527 |
Gross Unrealized Gains | 157 | 5 |
Gross Unrealized Losses | (9) | (104) |
Estimated Fair Value | $ 57,138 | $ 46,428 |

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