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Comprehensive (Loss) Income (Tables) | 3 Months Ended
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Jul. 31, 2018
Equity [Abstract] |
Components of Accumulated Other Comprehensive (Loss) Income | The components of accumulated other comprehensive (loss) income were as follows:
|  | July 31, 2018 |  |  | April 30, 2018 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (46,961 | ) |  | $ | (32,399 | )
Deferred compensation and pension plan adjustments, net of tax |  |  | (11,196 | ) |  |  | (9,073 | )
Interest rate swap unrealized gain, net of taxes |  |  | 1,669 |  |  |  | 1,337 |
Accumulated other comprehensive loss, net |  | $ | (56,488 | ) |  | $ | (40,135 | )
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 for the three months ended July 31, 2018.
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plan (1) |  |  | Unrealized gains on interest rate swap (2) |  |  | Accumulated Other Comprehensive Income (Loss) |
|  | (in thousands) |
Balance as of April 30, 2018 |  | $ | (32,399 | ) |  | $ | (9,073 | ) |  | $ | 1,337 |  |  | $ | (40,135 | )
Unrealized (losses) gains arising during the period |  |  | (14,562 | ) |  |  | — |  |  |  | 149 |  |  |  | (14,413 | )
Reclassification of realized net losses (gains) to net (loss) income |  |  | — |  |  |  | 273 |  |  |  | (16 | ) |  |  | 257 |
Effect of adoption of accounting standard |  |  | — |  |  |  | (2,396 | ) |  |  | 199 |  |  |  | (2,197 | )
Balance as of July 31, 2018 |  | $ | (46,961 | ) |  | $ | (11,196 | ) |  | $ | 1,669 |  |  | $ | (56,488 | )
The following table summarizes the changes in each component of accumulated other comprehensive (loss) income for the three months ended July 31, 2017:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plan (1) |  |  | Unrealized (losses) on interest rate swap (2) |  |  | Accumulated Other Comprehensive Income (Loss) |
|  | (in thousands) |
Balance as of April 30, 2017 |  | $ | (55,359 | ) |  | $ | (15,127 | ) |  | $ | (578 | ) |  | $ | (71,064 | )
Unrealized gains (losses) arising during the period |  |  | 16,084 |  |  |  | — |  |  |  | (234 | ) |  |  | 15,850 |
Reclassification of realized net losses to net income |  |  | — |  |  |  | 352 |  |  |  | 171 |  |  |  | 523 |
Balance as of July 31, 2017 |  | $ | (39,275 | ) |  | $ | (14,775 | ) |  | $ | (641 | ) |  | $ | (54,691 | )
(1) | The tax effect on the reclassifications of realized net losses was $0.1 million and $0.2 million for the three months ended July 31, 2018 and 2017, respectively.
(2) | The tax effect on unrealized gains (losses) was $0.1 million and $(0.1) million for the three months ended July 31, 2018 and 2017, respectively. The tax effect on the reclassification of realized net losses to net (loss) income was $0.1 million for the three months ended July 31, 2017.

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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=114867106&loc=d3e526-108580 + Details
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