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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | $ 689,244 | $ 626,360
Marketable Securities, Current |  | 41,951 | 8,288
Marketable securities, non-current |  | 132,134 | 132,463
Income Taxes & Other Receivables |  | 38,755 | 26,767
Income Taxes & Other Receivables |  | 2,634 | 718
Fair Value |  | 865,963 | 767,829
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 71,763 | 46,362
Fair Value |  | 71,763 | 46,362
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current | [1] | 9,278 | 8,288
Marketable securities, non-current | [1] | 132,134 | 132,463
Fair Value | [1] | 141,412 | 140,751
Fair Value, Inputs, Level 1 | Equity Securities |  |  |
Investment Holdings [Line Items] |  |  |
Marketable Securities, Current |  | 9,278 | 8,288
Marketable securities, non-current |  | 132,134 | 132,463
Fair Value |  | 141,412 | 140,751
Fair Value, Inputs, Level 1 | Cash |  |  |
Investment Holdings [Line Items] |  |  |
Cash and cash equivalents |  | 611,795 | 579,998
Fair Value |  | 611,795 | 579,998
Fair Value, Inputs, Level 2 |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 38,313 |
Unrealized Gains |  | 65 |
Unrealized Losses |  | (19) |
Fair Value |  | 38,359 |
Cash and cash equivalents |  | 5,686 |
Marketable Securities, Current |  | 32,673 |
Fair Value, Inputs, Level 2 | Commercial Paper |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 19,132 |
Unrealized Gains |  | 39 |
Fair Value |  | 19,171 |
Cash and cash equivalents |  | 4,785 |
Marketable Securities, Current |  | 14,386 |
Fair Value, Inputs, Level 2 | Corporate Notes/Bonds |  |  |
Investment Holdings [Line Items] |  |  |
Cost |  | 19,181 |
Unrealized Gains |  | 26 |
Unrealized Losses |  | (19) |
Fair Value |  | 19,188 |
Cash and cash equivalents |  | 901 |
Marketable Securities, Current |  | 18,287 |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |
Investment Holdings [Line Items] |  |  |
Income Taxes & Other Receivables |  | 2,634 | 99
Fair Value |  | $ 2,634 | 99
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |
Investment Holdings [Line Items] |  |  |
Income Taxes & Other Receivables |  |  | 619
Unrealized Gains |  |  | 619
Fair Value |  |  | $ 619
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $124.6 million and $122.3 million as of April 30, 2020 and 2019, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $21.7 million and $24.6 million as of April 30, 2020 and 2019, respectively. During fiscal 2020, the fair value of the investments decreased; therefore, the Company recognized loss of $1.8 million, which was recorded in other (loss) income, net. During fiscal 2019 and 2018, the fair value of the investments increased; therefore, the Company recognized income of $8.1 million, and $10.3 million, respectively, which was recorded in other (loss) income, net.

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