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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | $ 1,240,656 |  |
Ending balance |  | 1,221,381 | $ 1,240,656 |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (60,270) | (32,399) | $ (55,359)
Unrealized (losses) gains arising during the period |  | (23,382) | (27,871) | 22,960
Ending balance |  | (83,652) | (60,270) | (32,399)
Deferred Compensation and Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [1] | (16,838) | (9,073) | (15,127)
Effect of adoption of accounting standard | [1] |  | (2,396) |
Unrealized (losses) gains arising during the period | [1] | (8,883) | (6,461) | 4,813
Reclassification of realized losses (gains) to net income | [1] | 2,167 | 1,092 | 1,241
Ending balance | [1] | (23,554) | (16,838) | (9,073)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period |  | 37 |  |
Reclassification of realized losses (gains) to net income |  | (3) |  |
Ending balance |  | 34 |  |
Unrealized (Losses) Gains on Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [2] | 456 | 1,337 | (578)
Effect of adoption of accounting standard | [2] |  | 199 |
Unrealized (losses) gains arising during the period | [2] | (678) | (800) | 1,465
Reclassification of realized losses (gains) to net income | [2] | 222 | (280) | 450
Ending balance | [2] |  | 456 | 1,337
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (76,652) | (40,135) | (71,064)
Effect of adoption of accounting standard |  |  | (2,197) |
Unrealized (losses) gains arising during the period |  | (32,906) | (35,132) | 29,238
Reclassification of realized losses (gains) to net income |  | 2,386 | 812 | 1,691
Ending balance |  | $ (107,172) | $ (76,652) | $ (40,135)
[1] | The tax effects on unrealized (losses) gains were $(3.1) million, $(2.3) million and $2.5 million as of April 30, 2020, 2019 and 2018, respectively. The tax effects on reclassifications of realized net losses were $0.8 million, $0.4 million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively.
[2] | The tax effects on unrealized (losses) gains were $(0.2) million, $(0.3) million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively. The tax effect on the reclassification of realized net (losses) gains to net income was $(0.1) million, $0.1 million and $(0.3) million as of April 30, 2020 2019 and 2018, respectively.

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