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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands		Oct. 31, 2019	Apr. 30, 2019
Investment Holdings [Line Items]
Cash and cash equivalents		$ 464,423	$ 626,360
Marketable Securities, Current		6,508	8,288
Marketable securities, non-current		138,055	132,463
Income Taxes & Other Receivables		40,506	26,767
Other Accrued Liabilities		(158,071)	(162,047)
Fair Value, Inputs, Level 1
Investment Holdings [Line Items]
Cost		602,024	761,799
Unrealized Gains		7,560	6,301
Unrealized Losses		(598)	(989)
Fair Value		608,986	767,111
Cash and cash equivalents		464,423	626,360
Marketable Securities, Current		6,508	8,288
Marketable securities, non-current		138,055	132,463
Fair Value, Inputs, Level 1 | Cash
Investment Holdings [Line Items]
Cost		459,313	579,998
Fair Value		459,313	579,998
Cash and cash equivalents		459,313	579,998
Fair Value, Inputs, Level 1 | Money Market Funds
Investment Holdings [Line Items]
Cost		5,110	46,362
Fair Value		5,110	46,362
Cash and cash equivalents		5,110	46,362
Fair Value, Inputs, Level 1 | Mutual Funds
Investment Holdings [Line Items]
Cost	[1]	137,601	135,439
Unrealized Gains	[1]	7,560	6,301
Unrealized Losses	[1]	(598)	(989)
Fair Value	[1]	144,563	140,751
Marketable Securities, Current	[1]	6,508	8,288
Marketable securities, non-current	[1]	138,055	132,463
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts
Investment Holdings [Line Items]
Unrealized Gains		1,301	821
Unrealized Losses		(548)	(722)
Fair Value		753	99
Income Taxes & Other Receivables		753	99
Fair Value, Inputs, Level 2 | Interest Rate Swap
Investment Holdings [Line Items]
Unrealized Losses		(666)
Fair Value		(666)	619
Income Taxes & Other Receivables			619
Unrealized Gains			$ 619
Other Accrued Liabilities		$ (666)
[1] These investments are held in trust for settlement of the Company’s vested obligations of $131.5 million and $122.3 million as of October 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 $23.2 million and $24.6 million as of October 31, 2019 and April 30, 2019, respectively. During the three and six months ended October 31, 2019, the fair value of the investments increased; therefore, the Company recognized a gain of $1.2 million and $3.1 million, respectively, which was recorded in other income (loss), net. During the three and six months ended October 31, 2018, the fair value of the investments decreased; therefore, the Company recognized a loss of $4.8 million and $0.8 million, respectively, which was recorded in other income (loss), net.

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