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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Available-for-sale marketable securities: |  |
Total cash equivalents and available-for-sale marketable securities | $ 1,005,685 | $ 1,021,421
Corporate debt securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 160,232 | 2,368
U.S. treasury securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 2,000 | 57,998
Certificates of deposit |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 338,490 | 422,978
U.S. government agencies securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 15,793 | 0
Commercial paper |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 388,190 | 494,676
Fair Value, Recurring |  |
Available-for-sale marketable securities: |  |
Total cash equivalents and available-for-sale marketable securities | 1,005,685 | 1,021,421
Fair Value, Recurring | Money market funds |  |
Cash equivalents: |  |
Cash equivalents, fair value | 98,392 | 43,401
Fair Value, Recurring | Corporate debt securities |  |
Cash equivalents: |  |
Cash equivalents, fair value | 2,588 | 0
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 160,232 | 2,368
Fair Value, Recurring | U.S. treasury securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 2,000 | 57,998
Fair Value, Recurring | Certificates of deposit |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 338,490 | 422,978
Fair Value, Recurring | U.S. government agencies securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 15,793 | 0
Fair Value, Recurring | Commercial paper |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 388,190 | 494,676
Fair Value, Recurring | Level 1 |  |
Available-for-sale marketable securities: |  |
Total cash equivalents and available-for-sale marketable securities | 98,392 | 43,401
Fair Value, Recurring | Level 1 | Money market funds |  |
Cash equivalents: |  |
Cash equivalents, fair value | 98,392 | 43,401
Fair Value, Recurring | Level 1 | Corporate debt securities |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0 | 0
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 1 | U.S. treasury securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 1 | Certificates of deposit |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 1 | U.S. government agencies securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 1 | Commercial paper |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 2 |  |
Available-for-sale marketable securities: |  |
Total cash equivalents and available-for-sale marketable securities | 907,293 | 978,020
Fair Value, Recurring | Level 2 | Money market funds |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0 | 0
Fair Value, Recurring | Level 2 | Corporate debt securities |  |
Cash equivalents: |  |
Cash equivalents, fair value | 2,588 | 0
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 160,232 | 2,368
Fair Value, Recurring | Level 2 | U.S. treasury securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 2,000 | 57,998
Fair Value, Recurring | Level 2 | Certificates of deposit |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 338,490 | 422,978
Fair Value, Recurring | Level 2 | U.S. government agencies securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 15,793 | 0
Fair Value, Recurring | Level 2 | Commercial paper |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 388,190 | 494,676
Fair Value, Recurring | Level 3 |  |
Available-for-sale marketable securities: |  |
Total cash equivalents and available-for-sale marketable securities | 0 | 0
Fair Value, Recurring | Level 3 | Money market funds |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0 | 0
Fair Value, Recurring | Level 3 | Corporate debt securities |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0 | 0
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 3 | U.S. treasury securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 3 | Certificates of deposit |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 3 | U.S. government agencies securities |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | 0 | 0
Fair Value, Recurring | Level 3 | Commercial paper |  |
Available-for-sale marketable securities: |  |
Available-for-sale marketable securities, fair value | $ 0 | $ 0

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