Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2024	Apr. 30, 2024
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	$ 730,445	$ 690,441
Money market funds
Cash equivalents:
Estimated Fair Value	82,660	82,564
Commercial paper
Cash equivalents:
Estimated Fair Value	14,340	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	136,382	162,183
U.S. treasury securities
Cash equivalents:
Estimated Fair Value	2,745	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	7,208	2,497
Corporate debt securities
Cash equivalents:
Estimated Fair Value	1,985	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	358,167	310,095
Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	80,332	62,017
U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	46,626	46,428
Fair Value, Recurring
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	730,445	690,441
Fair Value, Recurring | Money market funds
Cash equivalents:
Estimated Fair Value	82,660	82,564
Fair Value, Recurring | Commercial paper
Cash equivalents:
Estimated Fair Value	14,340	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	136,382	162,183
Fair Value, Recurring | U.S. treasury securities
Cash equivalents:
Estimated Fair Value	2,745	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	7,208	2,497
Fair Value, Recurring | Corporate debt securities
Cash equivalents:
Estimated Fair Value	1,985	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	358,167	310,095
Fair Value, Recurring | Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	80,332	62,017
Fair Value, Recurring | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	46,626	46,428
Fair Value, Recurring | Level 1
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	82,660	82,564
Fair Value, Recurring | Level 1 | Money market funds
Cash equivalents:
Estimated Fair Value	82,660	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 | 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 | 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	647,785	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	14,340	18,769
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	136,382	162,183
Fair Value, Recurring | Level 2 | U.S. treasury securities
Cash equivalents:
Estimated Fair Value	2,745	5,888
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	7,208	2,497
Fair Value, Recurring | Level 2 | Corporate debt securities
Cash equivalents:
Estimated Fair Value	1,985	0
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	358,167	310,095
Fair Value, Recurring | Level 2 | Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	80,332	62,017
Fair Value, Recurring | Level 2 | U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	46,626	46,428
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 | 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 | 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