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Financial Instruments - Financial Instruments and Balance Sheet Classifications (Detail) - USD ($) $ in Thousands		Oct. 31, 2021	Apr. 30, 2021
Investment Holdings [Line Items]
Cash and cash equivalents		$ 725,391	$ 850,778
Marketable Securities, Current		77,496	63,667
Marketable securities, non-current		194,047	182,692
Income taxes and other receivables		564
Fair Value		997,498	1,097,125
Other Accrued Liabilities			(12)
Fair Value, Inputs, Level 2
Investment Holdings [Line Items]
Cost		80,383	80,325
Unrealized Gains		1	1
Unrealized Losses		(51)	(27)
Fair Value		80,333	80,299
Cash and cash equivalents			9,499
Marketable Securities, Current		67,421	54,583
Marketable securities, non-current		12,912	16,217
Fair Value, Inputs, Level 2 | Commercial Paper
Investment Holdings [Line Items]
Cost		41,629	51,979
Unrealized Gains		1	1
Unrealized Losses		(10)	(7)
Fair Value		41,620	51,973
Cash and cash equivalents			9,499
Marketable Securities, Current		41,620	42,474
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds
Investment Holdings [Line Items]
Cost		38,754	26,371
Unrealized Losses		(41)	(20)
Fair Value		38,713	26,351
Marketable Securities, Current		25,801	10,134
Marketable securities, non-current		12,912	16,217
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts
Investment Holdings [Line Items]
Income taxes and other receivables		564
Fair Value		564	(12)
Other Accrued Liabilities			(12)
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities
Investment Holdings [Line Items]
Cost			1,975
Fair Value			1,975
Marketable Securities, Current			1,975
Fair Value, Inputs, Level 1 | Mutual Funds
Investment Holdings [Line Items]
Marketable Securities, Current	[1]	10,075	9,084
Marketable securities, non-current	[1]	181,135	166,475
Fair Value	[1]	191,210	175,559
Fair Value, Inputs, Level 1 | Equity Securities
Investment Holdings [Line Items]
Marketable Securities, Current		10,075	9,084
Marketable securities, non-current		181,135	166,475
Fair Value		191,210	175,559
Fair Value, Inputs, Level 1 | Cash
Investment Holdings [Line Items]
Cash and cash equivalents		637,541	752,737
Fair Value		637,541	752,737
Fair Value, Inputs, Level 1 | Money Market Funds
Investment Holdings [Line Items]
Cash and cash equivalents		87,850	88,542
Fair Value		$ 87,850	$ 88,542
[1] These investments are held in trust for settlement of the Company’s vested obligations of $174.6 million and $157.3 million as of October 31, 2021 and April 30, 2021, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $26.7 million and $26.5 million as of October 31, 2021 and April 30, 2021, respectively. During the three and six months ended October 31, 2021, the fair value of the investments increased; therefore, the Company recognized a gain of $4.8 million and $10.0 million, respectively, which was recorded in other income, net. During the three and six months ended October 31, 2020, the fair value of the investments increased; therefore, the Company recognized a gain of $0.6 million and $12.0 million, respectively, which was recorded in other income, net.

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