Investments - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021
Cash equivalents:
Amortized Cost	$ 221,883	$ 339,528	$ 273,779
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	899,373	916,988
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	5	20
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(2,353)	(2,168)
Total cash equivalents and available-for-sale marketable securities	897,025	914,840
Money market funds
Cash equivalents:
Amortized Cost	112,208	107,726
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	112,208	107,726
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	12,795	12,764
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(1)
Estimated Fair Value	12,789	12,763
Certificates of deposit
Cash equivalents:
Amortized Cost	5,000	3,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value	5,000	3,000
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	95,054	97,205
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	95,054	97,205
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	22,307	14,113
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(298)	(223)
Estimated Fair Value	22,009	13,890
Commercial paper
Cash equivalents:
Amortized Cost	61,756	142,511
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	61,756	142,511
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	280,168	241,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Estimated Fair Value	280,168	241,132
Corporate debt securities
Cash equivalents:
Amortized Cost	1,779	8,889
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(5)
Estimated Fair Value	1,779	8,884
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	308,306	289,646
Gross Unrealized Gains	5	20
Gross Unrealized Losses	(2,049)	(1,937)
Estimated Fair Value	$ 306,262	$ 287,729

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