Investments - Cash Equivalents and Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Cash equivalents:
Amortized Cost	$ 284,829	$ 339,528	$ 115,355
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	718,102	916,988
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	227	20
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(612)	(2,168)
Total cash equivalents and available-for-sale marketable securities	717,717	914,840
Money market funds
Cash equivalents:
Amortized Cost	75,293	107,726
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	75,293	107,726
U.S. treasury securities
Available-for-sale marketable securities:
Amortized Cost	27,445	12,764
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(49)	(1)
Estimated Fair Value	27,397	12,763
Commercial paper
Cash equivalents:
Amortized Cost	112,851	142,511
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	112,851	142,511
Available-for-sale marketable securities:
Amortized Cost	184,230	241,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Estimated Fair Value	184,230	241,132
Corporate debt securities
Cash equivalents:
Amortized Cost	0	8,889
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(5)
Estimated Fair Value	0	8,884
Available-for-sale marketable securities:
Amortized Cost	179,608	289,646
Gross Unrealized Gains	115	20
Gross Unrealized Losses	(476)	(1,937)
Estimated Fair Value	179,247	287,729
Certificates of deposit
Cash equivalents:
Amortized Cost	2,000	3,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,000	3,000
Available-for-sale marketable securities:
Amortized Cost	61,025	97,205
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	61,025	97,205
U.S. government agencies securities
Available-for-sale marketable securities:
Amortized Cost	75,650	14,113
Gross Unrealized Gains	111	0
Gross Unrealized Losses	(87)	(223)
Estimated Fair Value	$ 75,674	$ 13,890

Cash And Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax

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