Cash Equivalents and Marketable Securities - Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Apr. 30, 2023	Oct. 31, 2022
Cash equivalents:
Amortized Cost	$ 149,009	$ 284,829	$ 277,622
Debt Securities, Available-for-Sale [Abstract]
Total cash equivalents and available-for-sale marketable securities, Amortized Cost	742,092	718,102
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Gain	25	227
Total cash equivalents and available-for-sale marketable securities, Gross Unrealized Loss	(800)	(612)
Total cash equivalents and available-for-sale marketable securities	741,317	717,717
Money market funds
Cash equivalents:
Amortized Cost	104,258	75,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	104,258	75,293
U.S. treasury securities
Cash equivalents:
Amortized Cost	1,989	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,989	0
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	4,921	27,445
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(49)
Estimated Fair Value	4,921	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
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	69,547	61,025
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	69,547	61,025
Commercial paper
Cash equivalents:
Amortized Cost	21,810	112,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	21,810	112,851
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	228,509	184,230
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	228,509	184,230
U.S. government agencies securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	58,655	75,650
Gross Unrealized Gains	6	111
Gross Unrealized Losses	(97)	(87)
Estimated Fair Value	58,564	75,674
Yankee bonds
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	2,240	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Estimated Fair Value	2,239	0
Corporate debt securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	250,163	179,608
Gross Unrealized Gains	19	115
Gross Unrealized Losses	(702)	(476)
Estimated Fair Value	$ 249,480	$ 179,247

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 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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