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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 626,360 | $ 520,848 | $ 410,882 | $ 273,252
Marketable Securities, Current |  | 8,288 | 14,293 |  |
Marketable securities, non-current |  | 132,463 | 122,792 |  |
Income Taxes & Other Receivables |  | 26,767 | 29,089 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 761,799 | 647,925 |  |
Unrealized Gains |  | 6,301 | 11,040 |  |
Unrealized Losses |  | (989) | (1,032) |  |
Fair Value |  | 767,111 | 657,933 |  |
Cash and cash equivalents |  | 626,360 | 520,848 |  |
Marketable Securities, Current |  | 8,288 | 14,293 |  |
Marketable securities, non-current |  | 132,463 | 122,792 |  |
Fair Value, Inputs, Level 1 | Cash |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 579,998 | 519,818 |  |
Fair Value |  | 579,998 | 519,818 |  |
Cash and cash equivalents |  | 579,998 | 519,818 |  |
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost |  | 46,362 | 1,030 |  |
Fair Value |  | 46,362 | 1,030 |  |
Cash and cash equivalents |  | 46,362 | 1,030 |  |
Fair Value, Inputs, Level 1 | Mutual Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Cost | [1] | 135,439 | 127,077 |  |
Unrealized Gains | [1] | 6,301 | 11,040 |  |
Unrealized Losses | [1] | (989) | (1,032) |  |
Fair Value | [1] | 140,751 | 137,085 |  |
Marketable Securities, Current | [1] | 8,288 | 14,293 |  |
Marketable securities, non-current | [1] | 132,463 | 122,792 |  |
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unrealized Gains |  | 821 | 1,778 |  |
Unrealized Losses |  | (722) | (1,025) |  |
Fair Value |  | 99 | 753 |  |
Income Taxes & Other Receivables |  | 99 | 753 |  |
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Fair Value |  | 619 | 2,076 |  |
Income Taxes & Other Receivables |  | 619 | 2,076 |  |
Unrealized Gains |  | $ 619 | $ 2,076 |  |
[1] | These investments are held in trust for settlement of the Company’s vested obligations of $122.3 million and $118.2 million as of April 30, 2019 and 2018, respectively, under the ECAP (see Note 6 — Deferred Compensation and Retirement Plans). Unvested obligations under the deferred compensation plans totaled $24.6 million and $29.5 million as of April 30, 2019 and 2018, respectively. During fiscal 2019, 2018, and 2017, the fair value of the investments increased; therefore, the Company recognized income of $8.1 million, $10.3 million, and $10.8 million, respectively, which was recorded in other income, net.

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