Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Apr. 30, 2024
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	$ 688,066	$ 690,441
Money market funds
Cash equivalents:
Estimated Fair Value	77,902	82,564
Commercial paper
Cash equivalents:
Estimated Fair Value	6,971	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	108,045	162,183
U.S. treasury securities
Cash equivalents:
Estimated Fair Value	0	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	14,395	2,497
Certificates of deposit
Cash equivalents:
Estimated Fair Value	3,960	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	84,645	62,017
U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	60,457	46,428
Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	331,691	310,095
Fair Value, Recurring
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	688,066	690,441
Fair Value, Recurring | Money market funds
Cash equivalents:
Estimated Fair Value	77,902	82,564
Fair Value, Recurring | Commercial paper
Cash equivalents:
Estimated Fair Value	6,971	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	108,045	162,183
Fair Value, Recurring | U.S. treasury securities
Cash equivalents:
Estimated Fair Value	0	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	14,395	2,497
Fair Value, Recurring | Certificates of deposit
Cash equivalents:
Estimated Fair Value	3,960	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	84,645	62,017
Fair Value, Recurring | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	60,457	46,428
Fair Value, Recurring | Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	331,691	310,095
Fair Value, Recurring | Level 1
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	77,902	82,564
Fair Value, Recurring | Level 1 | Money market funds
Cash equivalents:
Estimated Fair Value	77,902	82,564
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 | U.S. treasury 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 | Certificates of deposit
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. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Fair Value, Recurring | Level 1 | Corporate debt 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	610,164	607,877
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	6,971	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	108,045	162,183
Fair Value, Recurring | Level 2 | U.S. treasury securities
Cash equivalents:
Estimated Fair Value	0	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	14,395	2,497
Fair Value, Recurring | Level 2 | Certificates of deposit
Cash equivalents:
Estimated Fair Value	3,960	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	84,645	62,017
Fair Value, Recurring | Level 2 | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	60,457	46,428
Fair Value, Recurring | Level 2 | Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	331,691	310,095
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 | U.S. treasury 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 | Certificates of deposit
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. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	$ 0	$ 0