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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,648,071 |  |
Unrealized (losses) gains arising during the period | (15,233) | $ (788) | $ (41,715)
Reclassification of realized net losses to net income | 326 | 209 | 1,350
Ending balance | 1,733,058 | 1,648,071 |
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (96,860) | (92,717) | (33,666)
Unrealized (losses) gains arising during the period | (19,144) | (4,143) | (59,051)
Reclassification of realized net losses to net income | 0 | 0 | 0
Ending balance | (116,004) | (96,860) | (92,717)
Deferred Compensation and Pension Plan |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 4,381 | 961 | (18,135)
Unrealized (losses) gains arising during the period | 3,663 | 3,211 | 17,747
Reclassification of realized net losses to net income | 326 | 209 | 1,349
Ending balance | 8,370 | 4,381 | 961
Tax effect on unrealized gains, tax expense | 1,300 | 1,100 | 6,000
Tax effect on reclassification of realized net losses, tax benefit | 100 | 100 | 500
Unrealized (Losses) Gains on Marketable Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (285) | (429) | (19)
Unrealized (losses) gains arising during the period | 248 | 144 | (411)
Reclassification of realized net losses to net income | 0 | 0 | 1
Ending balance | (37) | (285) | (429)
Tax effect on unrealized gains (losses), tax expense (benefit) | 100 | 100 | (100)
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (92,764) | (92,185) | (51,820)
Ending balance | $ (107,671) | $ (92,764) | $ (92,185)

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