Financial Instruments - Schedule of Financial Instruments and Balance Sheet Classification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024	Apr. 30, 2024
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Assets, fair value	$ 1,059,843		$ 1,059,843		$ 1,195,001
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	779,298		779,298		941,005
Marketable Securities, Current	40,658		40,658		42,742
Marketable Securities, Non- current	241,037		241,037		211,681
Other Accrued Liabilities	(1,150)		(1,150)		(427)
Mutual funds
Balance Sheet Related Disclosures [Abstract]
Obligations for which assets are held in trust	220,300		220,300		198,600
Unvested obligations under deferred compensation plans	19,900		19,900		22,400
Increase in the fair value of marketable securities	9,100	$ 23,800	28,000	$ 22,800
Fair Value, Inputs, Level 2
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Cost	40,146		40,146		38,550
Unrealized Gains	81		81		4
Unrealized Losses	(36)		(36)		(55)
Fair Value	40,191		40,191		38,499
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		3,932
Marketable Securities, Current	26,088		26,088		25,414
Marketable Securities, Non- current	14,103		14,103		9,153
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | Foreign currency forward contracts
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Foreign currency forward contracts, fair value	(1,150)		(1,150)		(427)
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	0		0		0
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	(1,150)		(1,150)		(427)
Fair Value, Inputs, Level 2 | Commercial paper
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Cost	4,650		4,650		16,873
Unrealized Gains	0		0		1
Unrealized Losses	(3)		(3)		(19)
Fair Value	4,647		4,647		16,855
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		3,932
Marketable Securities, Current	4,647		4,647		12,923
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | Corporate notes/bonds
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Cost	31,030		31,030		17,322
Unrealized Gains	76		76		3
Unrealized Losses	(32)		(32)		(27)
Fair Value	31,074		31,074		17,298
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	17,470		17,470		10,050
Marketable Securities, Non- current	13,604		13,604		7,248
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 2 | U.S. Treasury and Agency Securities
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Cost	4,466		4,466		4,355
Unrealized Gains	5		5		0
Unrealized Losses	(1)		(1)		(9)
Fair Value	4,470		4,470		4,346
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	3,971		3,971		2,441
Marketable Securities, Non- current	499		499		1,905
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Mutual funds
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Equity securities, fair value	241,504		241,504		219,856
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	14,570		14,570		17,328
Marketable Securities, Non- current	226,934		226,934		202,528
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Equity investments
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Equity securities, fair value	241,504		241,504		219,856
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	0		0		0
Marketable Securities, Current	14,570		14,570		17,328
Marketable Securities, Non- current	226,934		226,934		202,528
Other Accrued Liabilities	0		0		0
Fair Value, Inputs, Level 1 | Cash
Fair Value Measurements, Nonrecurring Value Measurement [Abstract]
Cash and cash equivalents, fair value	604,876		604,876		790,938
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	604,876		604,876		790,938
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 Measurements, Nonrecurring Value Measurement [Abstract]
Cash and cash equivalents, fair value	174,422		174,422		146,135
Balance Sheet Related Disclosures [Abstract]
Cash and Cash Equivalents	174,422		174,422		146,135
Marketable Securities, Current	0		0		0
Marketable Securities, Non- current	0		0		0
Other Accrued Liabilities	$ 0		$ 0		$ 0