Cash Equivalents and Marketable Securities - Cash Equivalents and Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Cash equivalents:
Amortized Cost	$ 167,146	$ 284,829	$ 339,528
Available-for-sale marketable securities:
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	691,002	718,102
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	69	227
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(630)	(612)
Total cash equivalents and available-for-sale marketable securities	690,441	717,717
Money market funds
Cash equivalents:
Amortized Cost	82,564	75,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	82,564	75,293
Commercial paper
Cash equivalents:
Amortized Cost	18,769	112,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	18,769	112,851
Available-for-sale marketable securities:
Amortized Cost	162,183	184,230
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	162,183	184,230
U.S. treasury securities
Cash equivalents:
Amortized Cost	5,888	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5,888	0
Available-for-sale marketable securities:
Amortized Cost	2,497	27,445
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(49)
Estimated Fair Value	2,497	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
Available-for-sale marketable securities:
Amortized Cost	62,017	61,025
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	62,017	61,025
U.S. government agencies securities
Available-for-sale marketable securities:
Amortized Cost	46,527	75,650
Gross Unrealized Gains	5	111
Gross Unrealized Losses	(104)	(87)
Estimated Fair Value	46,428	75,674
Corporate debt securities
Available-for-sale marketable securities:
Amortized Cost	310,557	179,608
Gross Unrealized Gains	64	115
Gross Unrealized Losses	(526)	(476)
Estimated Fair Value	$ 310,095	$ 179,247

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

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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