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Comprehensive Income (Tables) | 12 Months Ended
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Apr. 30, 2020
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income (loss) were as follows:
|  | April 30, |
|  | 2020 |  |  | 2019 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (83,652 | ) |  | $ | (60,270 | )
Deferred compensation and pension plan adjustments, net of taxes |  |  | (23,554 | ) |  |  | (16,838 | )
Marketable securities unrealized gain, net of tax |  |  | 34 |  |  |  | — |
Interest rate swap unrealized gain, net of taxes |  |  | — |  |  |  | 456 |
Accumulated other comprehensive loss, net |  | $ | (107,172 | ) |  | $ | (76,652 | )
Changes in Each Component of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the changes in each component of accumulated other comprehensive income (loss):
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plan (1) |  |  | Unrealized Gain on Marketable Securities |  |  | Unrealized (Losses) Gains on Interest Rate Swap (2) |  |  | Accumulated Other Comprehensive Income (Loss) |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Balance as of May 1, 2017 |  | $ | (55,359 | ) |  | $ | (15,127 | ) |  | $ | — |  |  | $ | (578 | ) |  | $ | (71,064 | )
Unrealized gains arising during the period |  |  | 22,960 |  |  |  | 4,813 |  |  |  | — |  |  |  | 1,465 |  |  |  | 29,238 |
Reclassification of realized net losses to net income |  |  | — |  |  |  | 1,241 |  |  |  | — |  |  |  | 450 |  |  |  | 1,691 |
Balance as of April 30, 2018 |  |  | (32,399 | ) |  |  | (9,073 | ) |  |  | — |  |  |  | 1,337 |  |  |  | (40,135 | )
Unrealized losses arising during the period |  |  | (27,871 | ) |  |  | (6,461 | ) |  |  | — |  |  |  | (800 | ) |  |  | (35,132 | )
Reclassification of realized net losses (gains) to net income |  |  | — |  |  |  | 1,092 |  |  |  | — |  |  |  | (280 | ) |  |  | 812 |
Effect of adoption of accounting standard |  |  | — |  |  |  | (2,396 | ) |  |  | — |  |  |  | 199 |  |  |  | (2,197 | )
Balance as of April 30, 2019 |  |  | (60,270 | ) |  |  | (16,838 | ) |  |  | — |  |  |  | 456 |  |  |  | (76,652 | )
Unrealized (losses) gains arising during the period |  |  | (23,382 | ) |  |  | (8,883 | ) |  |  | 37 |  |  |  | (678 | ) |  |  | (32,906 | )
Reclassification of realized net losses (gains) to net income |  |  | — |  |  |  | 2,167 |  |  |  | (3 | ) |  |  | 222 |  |  |  | 2,386 |
Balance as of April 30, 2020 |  | $ | (83,652 | ) |  | $ | (23,554 | ) |  | $ | 34 |  |  | $ | — |  |  | $ | (107,172 | )
(1) | The tax effects on unrealized (losses) gains were $(3.1) million, $(2.3) million and $2.5 million as of April 30, 2020, 2019 and 2018, respectively. The tax effects on reclassifications of realized net losses were $0.8 million, $0.4 million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively.
(2) | The tax effects on unrealized (losses) gains were $(0.2) million, $(0.3) million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively. The tax effect on the reclassification of realized net (losses) gains to net income was $(0.1) million, $0.1 million and $(0.3) million as of April 30, 2020 2019 and 2018, respectively.

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