Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2026	Apr. 30, 2026
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	$ 608,557	$ 561,967
U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	3,880	0
Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	74,665	92,112
U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	80,622	69,691
Commercial paper
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	108,768	103,824
Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	246,699	243,625
Money market funds
Cash equivalents:
Estimated Fair Value	80,478	52,715
Commercial paper
Cash equivalents:
Estimated Fair Value	12,401	0
Corporate debt securities
Cash equivalents:
Estimated Fair Value	1,044	0
Level 1
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	80,478	52,715
Level 1 \| U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 1 \| Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 1 \| U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 1 \| Commercial paper
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 1 \| Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 1 \| Money market funds
Cash equivalents:
Estimated Fair Value	80,478	52,715
Level 1 \| Commercial paper
Cash equivalents:
Estimated Fair Value	0	0
Level 1 \| Corporate debt securities
Cash equivalents:
Estimated Fair Value	0	0
Level 2
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	528,079	509,252
Level 2 \| U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	3,880	0
Level 2 \| Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	74,665	92,112
Level 2 \| U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	80,622	69,691
Level 2 \| Commercial paper
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	108,768	103,824
Level 2 \| Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	246,699	243,625
Level 2 \| Money market funds
Cash equivalents:
Estimated Fair Value	0	0
Level 2 \| Commercial paper
Cash equivalents:
Estimated Fair Value	12,401	0
Level 2 \| Corporate debt securities
Cash equivalents:
Estimated Fair Value	1,044	0
Level 3
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities	0	0
Level 3 \| U.S. treasury securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 3 \| Certificates of deposit
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 3 \| U.S. government agencies securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 3 \| Commercial paper
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 3 \| Corporate debt securities
Available-for-sale marketable securities:
Available-for-sale marketable securities, fair value	0	0
Level 3 \| Money market funds
Cash equivalents:
Estimated Fair Value	0	0
Level 3 \| Commercial paper
Cash equivalents:
Estimated Fair Value	0	0
Level 3 \| Corporate debt securities
Cash equivalents:
Estimated Fair Value	$ 0	$ 0