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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021	Apr. 30, 2022
Fair Value Measurement
Assets, fair value	$ 831,452		$ 831,452		$ 1,210,893
Balance Sheet Classification
Cash and Cash Equivalents	593,900		593,900		978,070
Marketable Securities, Current	59,188		59,188		57,244
Marketable Securities, Non- current	178,565		178,565		175,783
Other Accrued Liabilities	(201)		(201)		(204)
Obligations for which assets are held in trust	164,100		164,100		160,800
Unvested obligations under deferred compensation plans	20,700		20,700		24,000
Gain (loss) on marketable securities	(9,700)	$ 4,800	(9,700)	$ 10,000
Fair Value, Inputs, Level 2
Fair Value Measurement
Cost	61,836		61,836		80,358
Unrealized Gains	0		0		0
Unrealized Losses	(1,001)		(1,001)		(584)
Debt securities AFS, fair value	60,835		60,835		79,774
Balance Sheet Classification
Cash and Cash Equivalents	0		0		15,489
Marketable Securities, Current	50,900		50,900		47,241
Marketable Securities, Non- current	9,935		9,935		17,044
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | Foreign currency forward contracts
Fair Value Measurement
Foreign currency forward contracts, fair value	(201)		(201)		(204)
Balance Sheet Classification
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	0		0		0
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	(201)		(201)		(204)
Fair Value, Inputs, Level 2 | Commercial paper
Fair Value Measurement
Cost	23,362		23,362		41,627
Unrealized Gains	0		0		0
Unrealized Losses	(213)		(213)		(126)
Debt securities AFS, fair value	23,149		23,149		41,501
Balance Sheet Classification
Cash and Cash Equivalents	0		0		15,489
Marketable Securities, Current	23,149		23,149		26,012
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | Corporate notes/bonds
Fair Value Measurement
Cost	37,476		37,476		37,736
Unrealized Gains	0		0		0
Unrealized Losses	(780)		(780)		(450)
Debt securities AFS, fair value	36,696		36,696		37,286
Balance Sheet Classification
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	26,761		26,761		20,242
Marketable Securities, Non- current	9,935		9,935		17,044
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities
Fair Value Measurement
Cost	998		998		995
Unrealized Gains	0		0		0
Unrealized Losses	(8)		(8)		(8)
Debt securities AFS, fair value	990		990		987
Balance Sheet Classification
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	990		990		987
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Mutual funds
Fair Value Measurement
Equity securities, fair value	176,918		176,918		168,742
Balance Sheet Classification
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	8,288		8,288		10,003
Marketable Securities, Non- current	168,630		168,630		158,739
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Total equity investments
Fair Value Measurement
Equity securities, fair value	176,918		176,918		168,742
Balance Sheet Classification
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	8,288		8,288		10,003
Marketable Securities, Non- current	168,630		168,630		158,739
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Cash
Fair Value Measurement
Cash and cash equivalents, fair value	513,256		513,256		874,490
Balance Sheet Classification
Cash and Cash Equivalents	513,256		513,256		874,490
Marketable Securities, Current	0		0		0
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Money market funds
Fair Value Measurement
Cash and cash equivalents, fair value	80,644		80,644		88,091
Balance Sheet Classification
Cash and Cash Equivalents	80,644		80,644		88,091
Marketable Securities, Current	0		0		0
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	$ 0		$ 0		$ 0

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