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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands		Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2018	Apr. 30, 2018
Investment Holdings [Line Items]
Cash and cash equivalents		$ 424,637	$ 626,360	$ 365,729	$ 520,848
Marketable Securities, Current		8,508	8,288
Marketable securities, non-current		134,148	132,463
Other Accrued Liabilities		(156,218)	(162,047)
Income Taxes & Other Receivables		30,529	26,767
Fair Value, Inputs, Level 1
Investment Holdings [Line Items]
Cost		560,895	761,799
Unrealized Gains		7,168	6,301
Unrealized Losses		(770)	(989)
Fair Value		567,293	767,111
Cash and cash equivalents		424,637	626,360
Marketable Securities, Current		8,508	8,288
Marketable securities, non-current		134,148	132,463
Fair Value, Inputs, Level 1 | Cash
Investment Holdings [Line Items]
Cost		378,070	579,998
Fair Value		378,070	579,998
Cash and cash equivalents		378,070	579,998
Fair Value, Inputs, Level 1 | Money Market Funds
Investment Holdings [Line Items]
Cost		46,567	46,362
Fair Value		46,567	46,362
Cash and cash equivalents		46,567	46,362
Fair Value, Inputs, Level 1 | Mutual Funds
Investment Holdings [Line Items]
Cost	[1]	136,258	135,439
Unrealized Gains	[1]	7,168	6,301
Unrealized Losses	[1]	(770)	(989)
Fair Value	[1]	142,656	140,751
Marketable Securities, Current	[1]	8,508	8,288
Marketable securities, non-current	[1]	134,148	132,463
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts
Investment Holdings [Line Items]
Unrealized Gains		840	821
Unrealized Losses		(1,411)	(722)
Fair Value		(571)	99
Other Accrued Liabilities		(571)
Income Taxes & Other Receivables			99
Fair Value, Inputs, Level 2 | Interest Rate Swap
Investment Holdings [Line Items]
Unrealized Losses		(185)
Fair Value		(185)	619
Other Accrued Liabilities		$ (185)
Unrealized Gains			619
Income Taxes & Other Receivables			$ 619
[1] These investments are held in trust for settlement of the Company’s vested obligations of $133.7 million and $122.3 million as of July 31, 2019 and April 30, 2019, respectively, under the ECAP (see Note 7 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $17.3 million and $24.6 million as of July 31, 2019 and April 30, 2019, respectively. During the three months ended July 31, 2019 and 2018, the fair value of the investments increased; therefore, the Company recognized a gain of $1.9 million and $4.0 million, respectively, which was recorded in other income, net.

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