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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | $ 1,366,389 |  |
Ending balance |  | 1,544,346 | $ 1,366,389 |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | (33,666) | (83,652) | $ (60,270)
Unrealized (losses) gains arising during the period |  | (59,051) | 49,986 | (23,382)
Ending balance |  | (92,717) | (33,666) | (83,652)
Deferred Compensation and Pension Plan |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [1] | (18,135) | (23,554) | (16,838)
Unrealized (losses) gains arising during the period | [1] | 17,747 | 2,660 | (8,883)
Reclassification of realized net losses (gains) to net income | [1] | 1,349 | 2,759 | 2,167
Ending balance | [1] | 961 | (18,135) | (23,554)
Unrealized Gains (Losses) on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [2] | (19) | 34 |
Unrealized (losses) gains arising during the period | [2] | (411) | (53) | 37
Reclassification of realized net losses (gains) to net income | [2] | 1 |  | (3)
Ending balance | [2] | (429) | (19) | 34
Unrealized Gains on Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance | [3] |  |  | 456
Unrealized (losses) gains arising during the period | [3] |  |  | (678)
Reclassification of realized net losses (gains) to net income | [3] |  |  | 222
Accumulated Other Comprehensive Loss, Net |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning balance |  | (51,820) | (107,172) | (76,652)
Unrealized (losses) gains arising during the period |  | (41,715) | 52,593 | (32,906)
Reclassification of realized net losses (gains) to net income |  | 1,350 | 2,759 | 2,386
Ending balance |  | $ (92,185) | $ (51,820) | $ (107,172)
[1] | The tax effects on unrealized gains (losses) were $6.0 million, $1.1 million and $(3.1) million as of April 30, 2022, 2021 and 2020, respectively. The tax effects on reclassifications of realized net losses were $0.5 million, $1.0 million and $0.8 million as of April 30, 2022, 2021 and 2020, respectively.
[2] | The tax effects on unrealized (losses) were $(0.1) million as of April 30, 2022.
[3] | The tax effects on unrealized (losses) were $(0.2) million as of April 30, 2020. The tax effects on the reclassification of realized net losses to net income was $0.1 million as of April 30, 2020.

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