Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jan. 31, 2024	Apr. 30, 2023	Jan. 31, 2023
Cash equivalents:
Amortized Cost	$ 114,561	$ 284,829	$ 311,142
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	701,396	718,102
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	598	227
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(168)	(612)
Total cash equivalents and available-for-sale marketable securities	701,826	717,717
Money market funds
Cash equivalents:
Amortized Cost	78,747	75,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	78,747	75,293
Certificates of deposit
Cash equivalents:
Amortized Cost	3,500	2,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	3,500	2,000
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	65,514	61,025
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	65,514	61,025
Commercial paper
Cash equivalents:
Amortized Cost	8,925	112,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	8,925	112,851
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	161,222	184,230
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	161,222	184,230
Corporate debt securities
Cash equivalents:
Amortized Cost	1,893	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,893	0
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	316,512	179,608
Gross Unrealized Gains	450	115
Gross Unrealized Losses	(155)	(476)
Estimated Fair Value	316,807	179,247
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	7,454	27,445
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	(49)
Estimated Fair Value	7,455	27,397
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	57,629	75,650
Gross Unrealized Gains	147	111
Gross Unrealized Losses	(13)	(87)
Estimated Fair Value	$ 57,763	$ 75,674

Cash And Cash Equivalents Accumulated Gross Unrealized Gain Before Tax

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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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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