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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ 1,221,381 |  |  |
Ending balance |  | $ 1,219,972 |  |  |  | 1,219,972 |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (58,705) |  | $ (65,632) |  | (83,652) |  | $ (60,270) |
Unrealized gains (losses) arising during the period |  | (2,721) |  | 1,329 |  | 22,226 |  | (4,033) |
Ending balance |  | (61,426) |  | (64,303) |  | (61,426) |  | (64,303) |
Deferred Compensation and Pension Plan |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (22,912) | [1] | (16,343) | [2] | (23,554) | [1] | (16,838) | [2]
Reclassification of realized net losses (gains) to net income |  | 683 | [1] | 495 | [2] | 1,325 | [1] | 990 | [2]
Ending balance |  | (22,229) | [1] | (15,848) | [2] | (22,229) | [1] | (15,848) | [2]
Unrealized Gains (Losses) on Marketable Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 25 |  |  |  | 34 |  |  |
Unrealized gains (losses) arising during the period |  | (25) |  |  |  | (34) |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (81,592) |  | (82,114) |  | (107,172) |  | (76,652) |
Unrealized gains (losses) arising during the period |  | (2,746) |  | 1,014 |  | 22,192 |  | (4,839) |
Reclassification of realized net losses (gains) to net income |  | 683 |  | 454 |  | 1,325 |  | 845 |
Ending balance |  | $ (83,655) |  | (80,646) |  | $ (83,655) |  | (80,646) |
Unrealized (Losses) Gains on Interest Rate Swap |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [3] |  |  | (139) |  |  |  | 456 |
Unrealized gains (losses) arising during the period | [3] |  |  | (315) |  |  |  | (806) |
Reclassification of realized net losses (gains) to net income | [3] |  |  | (41) |  |  |  | (145) |
Ending balance | [3] |  |  | $ (495) |  |  |  | $ (495) |
[1] | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.5 million for the three and six months ended October 31, 2020, respectively.
[2] | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.3 million for the three and six months ended October 31, 2019, respectively.
[3] | The tax effect on unrealized losses was $0.1 million and $0.3 million for the three and six months ended October 31, 2019, respectively.

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