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Comprehensive Income (Tables) | 12 Months Ended
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Apr. 30, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss, net were as follows:
|  | April 30, |
|  | 2021 |  |  | 2020 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (33,666 | ) |  | $ | (83,652 | )
Deferred compensation and pension plan adjustments, net of taxes |  |  | (18,135 | ) |  |  | (23,554 | )
Marketable securities unrealized (loss) gain, net of tax |  |  | (19 | ) |  |  | 34 |
Accumulated other comprehensive loss, net |  | $ | (51,820 | ) |  | $ | (107,172 | )
Changes in Each Component of Accumulated Other Comprehensive Loss | The following table summarizes the changes in each component of accumulated other comprehensive loss, net:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plan (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Unrealized Gains on Interest Rate Swap (2) |  |  | Accumulated Other Comprehensive Loss |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Balance as of May 1, 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 | )
Unrealized gains (losses) arising during the period |  |  | 49,986 |  |  |  | 2,660 |  |  |  | (53 | ) |  |  | — |  |  |  | 52,593 |
Reclassification of realized net losses to net income |  |  | — |  |  |  | 2,759 |  |  |  | — |  |  |  | — |  |  |  | 2,759 |
Balance as of April 30, 2021 |  | $ | (33,666 | ) |  | $ | (18,135 | ) |  | $ | (19 | ) |  | $ | — |  |  | $ | (51,820 | )
(1) | The tax effects on unrealized gains (losses) were $1.1 million, $(3.1) million and $(2.3) million as of April 30, 2021, 2020 and 2019, respectively. The tax effects on reclassifications of realized net losses were $1.0 million, $0.8 million and $0.4 million as of April 30, 2021, 2020 and 2019, respectively.
(2) | The tax effects on unrealized (losses) gains were $(0.2) million and $(0.3) million as of 2020 and 2019, respectively. The tax effects on the reclassification of realized net (losses) gains to net income was $(0.1) million and $0.1 million as of 2020 and 2019, respectively.

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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