Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Apr. 30, 2025
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	$ 688,966	$ 696,339
Money market funds
Cash equivalents:
Estimated Fair Value	50,155	87,872
Commercial paper
Cash equivalents:
Estimated Fair Value	7,854	29,122
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	135,971	113,787
Corporate debt securities
Cash equivalents:
Estimated Fair Value	0	1,015
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	317,191	315,405
U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	29,776	15,482
Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	85,981	76,518
U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	62,038	57,138
Fair Value, Recurring
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	688,966	696,339
Fair Value, Recurring | Money market funds
Cash equivalents:
Estimated Fair Value	50,155	87,872
Fair Value, Recurring | Commercial paper
Cash equivalents:
Estimated Fair Value	7,854	29,122
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	135,971	113,787
Fair Value, Recurring | Corporate debt securities
Cash equivalents:
Estimated Fair Value	0	1,015
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	317,191	315,405
Fair Value, Recurring | U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	29,776	15,482
Fair Value, Recurring | Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	85,981	76,518
Fair Value, Recurring | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	62,038	57,138
Fair Value, Recurring | Level 1
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	50,155	87,872
Fair Value, Recurring | Level 1 | Money market funds
Cash equivalents:
Estimated Fair Value	50,155	87,872
Fair Value, Recurring | Level 1 | Commercial paper
Cash equivalents:
Estimated Fair Value	0	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Fair Value, Recurring | Level 1 | Corporate debt securities
Cash equivalents:
Estimated 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 2
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	638,811	608,467
Fair Value, Recurring | Level 2 | Money market funds
Cash equivalents:
Estimated Fair Value	0	0
Fair Value, Recurring | Level 2 | Commercial paper
Cash equivalents:
Estimated Fair Value	7,854	29,122
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	135,971	113,787
Fair Value, Recurring | Level 2 | Corporate debt securities
Cash equivalents:
Estimated Fair Value	0	1,015
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	317,191	315,405
Fair Value, Recurring | Level 2 | U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	29,776	15,482
Fair Value, Recurring | Level 2 | Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	85,981	76,518
Fair Value, Recurring | Level 2 | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	62,038	57,138
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:
Estimated Fair Value	0	0
Fair Value, Recurring | Level 3 | Commercial paper
Cash equivalents:
Estimated Fair Value	0	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Cash equivalents:
Estimated 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