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Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | $ 1,240,656 |
Ending balance |  | 1,260,900 |
Foreign Currency Translation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (60,270) | $ (32,399)
Unrealized (losses) gains arising during the period |  | (5,362) | (14,562)
Ending balance |  | (65,632) | (46,961)
Deferred Compensation and Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [1] | (16,838) | (9,073)
Reclassification of realized net losses (gains) to net income | [1] | 495 | 273
Effect of adoption of accounting standard | [1] |  | (2,396)
Ending balance | [1] | (16,343) | (11,196)
Unrealized (Losses) Gains on Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [2] | 456 | 1,337
Unrealized (losses) gains arising during the period | [2] | (491) | 149
Reclassification of realized net losses (gains) to net income | [2] | (104) | (16)
Effect of adoption of accounting standard | [2] |  | 199
Ending balance | [2] | (139) | 1,669
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (76,652) | (40,135)
Unrealized (losses) gains arising during the period |  | (5,853) | (14,413)
Reclassification of realized net losses (gains) to net income |  | 391 | 257
Effect of adoption of accounting standard |  |  | (2,197)
Ending balance |  | $ (82,114) | $ (56,488)
[1] | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.1 million for the three months ended July 31, 2019 and 2018, respectively.
[2] | The tax effect on unrealized (losses) gains was $(0.2) million and $0.1 million for the three months ended July 31, 2019 and 2018, respectively.

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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