Investments - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2022
Cash equivalents:
Amortized Cost	$ 206,442	$ 284,829	$ 221,883
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	757,142	718,102
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	43	227
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(801)	(612)
Total cash equivalents and available-for-sale marketable securities	756,384	717,717
Money market funds
Cash equivalents:
Amortized Cost	74,591	75,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	74,591	75,293
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	0	27,445
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(49)
Estimated Fair Value	0	27,397
Certificates of deposit
Cash equivalents:
Amortized Cost	0	2,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	0	2,000
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	64,029	61,025
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	64,029	61,025
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	43,611	75,650
Gross Unrealized Gains	1	111
Gross Unrealized Losses	(118)	(87)
Estimated Fair Value	43,494	75,674
Commercial paper
Cash equivalents:
Amortized Cost	76,111	112,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	76,111	112,851
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	260,864	184,230
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	260,864	184,230
Corporate debt securities
Cash equivalents:
Amortized Cost	2,543	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,543	0
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	235,393	179,608
Gross Unrealized Gains	42	115
Gross Unrealized Losses	(683)	(476)
Estimated Fair Value	$ 234,752	$ 179,247

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