Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024
Cash equivalents:
Amortized Cost	$ 80,941	$ 164,358	$ 133,820
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	689,038	695,816
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	258	663
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(330)	(140)
Total cash equivalents and available-for-sale marketable securities	688,966	696,339
Money market funds
Cash equivalents:
Amortized Cost	50,155	87,872
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	50,155	87,872
Commercial paper
Cash equivalents:
Amortized Cost	7,854	29,122
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	7,854	29,122
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	135,971	113,787
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	135,971	113,787
Corporate debt securities
Cash equivalents:
Amortized Cost	0	1,015
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	0	1,015
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	317,171	315,034
Gross Unrealized Gains	234	502
Gross Unrealized Losses	(214)	(131)
Estimated Fair Value	317,191	315,405
U.S. treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	29,789	15,478
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(13)	0
Estimated Fair Value	29,776	15,482
Certificates of deposit
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	85,981	76,518
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	85,981	76,518
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	62,117	56,990
Gross Unrealized Gains	24	157
Gross Unrealized Losses	(103)	(9)
Estimated Fair Value	$ 62,038	$ 57,138

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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Cash, Cash Equivalents And Available-for-sale Debt Securities, Amortized Cost

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Fair value portion of asset recognized for present right to economic benefit.

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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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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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