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Investments - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021 | Oct. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash equivalents | $ 167,436 | $ 115,355 | $ 114,603
Gross Unrealized Gains | 29 | 101 |
Gross Unrealized Losses | (269) | (20) |
Cash, cash equivalents and available-for-sale debt securities, amortized cost | 1,005,925 | 1,021,340 |
Total cash equivalents and available-for-sale marketable securities | 1,005,685 | 1,021,421 |
Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash equivalents | 98,392 | 43,401 |
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash equivalents | 2,588 | 0 |
Amortized Cost | 160,470 | 2,369 |
Gross Unrealized Gains | 7 | 0 |
Gross Unrealized Losses | (245) | (1) |
Estimated Fair Value | 160,232 | 2,368 |
U.S. treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,000 | 57,993 |
Gross Unrealized Gains | 0 | 5 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 2,000 | 57,998 |
Certificates of deposit |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 338,482 | 422,952 |
Gross Unrealized Gains | 9 | 32 |
Gross Unrealized Losses | (1) | (6) |
Estimated Fair Value | 338,490 | 422,978 |
U.S. government agencies securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 15,815 | 0 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (22) | 0 |
Estimated Fair Value | 15,793 | 0 |
Commercial paper |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 388,178 | 494,625 |
Gross Unrealized Gains | 13 | 64 |
Gross Unrealized Losses | (1) | (13) |
Estimated Fair Value | $ 388,190 | $ 494,676 |

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