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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |  |
Beginning balance |  | $ 1,216,607 |  |
Ending balance |  | 1,240,656 | $ 1,216,607 |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |  |
Beginning balance |  | (32,399) | (55,359) | $ (36,339)
Unrealized (losses) gains arising during the period |  | (27,871) | 22,960 | (19,020)
Ending balance |  | (60,270) | (32,399) | (55,359)
Deferred Compensation and Pension Plan |  |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |  |
Beginning balance | [1] | (9,073) | (15,127) | (21,572)
Unrealized (losses) gains arising during the period | [1] | (6,461) | 4,813 | 4,584
Reclassification of realized losses (gains) to net income | [1] | 1,092 | 1,241 | 1,861
Effect of adoption of accounting standard | [1] | (2,396) |  |
Ending balance | [1] | (16,838) | (9,073) | (15,127)
Unrealized (Losses) Gains on Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |  |
Beginning balance | [2] | 1,337 | (578) |
Unrealized (losses) gains arising during the period | [2] | (800) | 1,465 | (635)
Reclassification of realized losses (gains) to net income | [2] | (280) | 450 | 57
Effect of adoption of accounting standard | [2] | 199 |  |
Ending balance | [2] | 456 | 1,337 | (578)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive (Loss) Income [Line Items] |  |  |  |
Beginning balance |  | (40,135) | (71,064) | (57,911)
Unrealized (losses) gains arising during the period |  | (35,132) | 29,238 | (15,071)
Reclassification of realized losses (gains) to net income |  | 812 | 1,691 | 1,918
Effect of adoption of accounting standard |  | (2,197) |  |
Ending balance |  | $ (76,652) | $ (40,135) | $ (71,064)
[1] | The tax effects on unrealized (losses) gains were $(2.3) million, $2.5 million and $1.9 million as of April 30, 2019, 2018 and 2017, respectively. The tax effects on reclassifications of realized net losses were $0.4 million, $0.8 million and $1.2 million as of April 30, 2019, 2018 and 2017, respectively.
[2] | The tax effects on unrealized (losses) gains were $(0.3) million, $0.8 million and $(0.4) million as of April 30, 2019, 2018 and 2017, respectively. The tax effect on the reclassification of realized net gains (losses) to net income was $0.1 million and $(0.3) million as of April 30, 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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