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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ 1,366,389 |  |  |
Ending balance |  | $ 1,531,277 |  |  |  | 1,531,277 |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (49,051) |  | $ (61,426) |  | (33,666) |  | $ (83,652) |
Unrealized (losses) gains arising during the period |  | (15,232) |  | 25,083 |  | (30,617) |  | 47,309 |
Ending balance |  | (64,283) |  | (36,343) |  | (64,283) |  | (36,343) |
Deferred Compensation and Pension Plan |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (17,443) | [1] | (22,229) | [2] | (18,135) | [1] | (23,554) | [2]
Unrealized (losses) gains arising during the period | [1] | 824 |  |  |  | 839 |  |  |
Reclassification of realized net losses to net income |  | 335 | [1] | 663 | [2] | 1,012 | [1] | 1,988 | [2]
Ending balance |  | (16,284) | [1] | (21,566) | [2] | (16,284) | [1] | (21,566) | [2]
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (36) |  |  |  | (19) |  | 34 |
Unrealized (losses) gains arising during the period |  | (115) |  | (5) |  | (133) |  | (39) |
Reclassification of realized net losses to net income |  |  |  |  |  | 1 |  |  |
Ending balance |  | (151) |  | (5) |  | (151) |  | (5) |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (66,530) |  | (83,655) |  | (51,820) |  | (107,172) |
Unrealized (losses) gains arising during the period |  | (14,523) |  | 25,078 |  | (29,911) |  | 47,270 |
Reclassification of realized net losses to net income |  | 335 |  | 663 |  | 1,013 |  | 1,988 |
Ending balance |  | $ (80,718) |  | $ (57,914) |  | $ (80,718) |  | $ (57,914) |
[1] | The tax effect on unrealized (losses) gains were $0.3 million for the three and nine months ended January 31, 2022. The tax effect on the reclassifications of realized net losses was $0.1 million and $0.3 million for the three and nine months ended January 31, 2022
[2] | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.7 million for the three and nine months ended January 31, 2021

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