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Comprehensive Income (Tables) | 12 Months Ended
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Apr. 30, 2018
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss were as follows:
|  | April 30, |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (32,399 | ) |  | $ | (55,359 | )
Deferred compensation and pension plan adjustments, net of taxes |  |  | (9,073 | ) |  |  | (15,127 | )
Interest rate swap unrealized gain (loss), net of taxes |  |  | 1,337 |  |  |  | (578 | )
Accumulated other comprehensive loss, net |  | $ | (40,135 | ) |  | $ | (71,064 | )
Changes in Each Component of Accumulated Other Comprehensive (Loss) Income | The following table summarizes the changes in each component of accumulated other comprehensive (loss) income:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plan (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Unrealized (losses) gains on interest rate swap (2) |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance as of May 1, 2015 |  | $ | (20,919 | ) |  | $ | (19,708 | ) |  | $ | 4 |  |  | $ | — |  |  | $ | (40,623 | )
Unrealized losses arising during the period |  |  | (15,420 | ) |  |  | (3,653 | ) |  |  | (4 | ) |  |  | — |  |  |  | (19,077 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 1,789 |  |  |  | — |  |  |  | — |  |  |  | 1,789 |
Balance as of April 30, 2016 |  |  | (36,339 | ) |  |  | (21,572 | ) |  |  | — |  |  |  | — |  |  |  | (57,911 | )
Unrealized (losses) gains arising during the period |  |  | (19,020 | ) |  |  | 4,584 |  |  |  | — |  |  |  | (635 | ) |  |  | (15,071 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 1,861 |  |  |  | — |  |  |  | 57 |  |  |  | 1,918 |
Balance as of April 30, 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 | )
(1) | The tax effects on unrealized gains (losses) were $2.5 million, $1.9 million and $(2.3) million as of April 30, 2018, 2017 and 2016, respectively. The tax effects on reclassifications of realized net losses were $0.8 million, $1.2 million and $1.1 million as of April 30, 2018, 2017 and 2016, respectively.
(2) | The tax effects on unrealized gains (losses) were $0.8 million and $(0.4) million as of April 30, 2018 and 2017, respectively. The tax effect on the reclassification of realized net losses to net income was $0.3 million as of April 30, 2018.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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