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Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Oct. 31, 2018
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income (loss) were as follows:
|  | October 31, 2018 |  |  | April 30, 2018 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (59,472 | ) |  | $ | (32,399 | )
Deferred compensation and pension plan adjustments, net of tax |  |  | (10,923 | ) |  |  | (9,073 | )
Interest rate swap unrealized gain, net of taxes |  |  | 1,814 |  |  |  | 1,337 |
Accumulated other comprehensive loss, net |  | $ | (68,581 | ) |  | $ | (40,135 | )
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) for the three months ended October 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 July 31, 2018 |  | $ | (46,961 | ) |  | $ | (11,196 | ) |  | $ | 1,669 |  |  | $ | (56,488 | )
Unrealized (losses) gains arising during the period |  |  | (12,511 | ) |  |  | — |  |  |  | 193 |  |  |  | (12,318 | )
Reclassification of realized net losses (gains) to net income |  |  | — |  |  |  | 273 |  |  |  | (48 | ) |  |  | 225 |
Balance as of October 31, 2018 |  | $ | (59,472 | ) |  | $ | (10,923 | ) |  | $ | 1,814 |  |  | $ | (68,581 | )
The following table summarizes the changes in each component of accumulated other comprehensive (loss) income for the six months ended October 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 |  |  | (27,073 | ) |  |  | — |  |  |  | 342 |  |  |  | (26,731 | )
Reclassification of realized net losses (gains) to net income |  |  | — |  |  |  | 546 |  |  |  | (64 | ) |  |  | 482 |
Effect of adoption of accounting standard |  |  | — |  |  |  | (2,396 | ) |  |  | 199 |  |  |  | (2,197 | )
Balance as of October 31, 2018 |  | $ | (59,472 | ) |  | $ | (10,923 | ) |  | $ | 1,814 |  |  | $ | (68,581 | )
(1) | The tax effect on the reclassifications of realized net losses was $0.1 million and $0.2 million for the three and six months ended October 31, 2018, respectively.
(2) | The tax effect on unrealized gains was $0.1 million for both the three and six months ended October 31, 2018, respectively.
The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net for the three months ended October 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 July 31, 2017 |  | $ | (39,275 | ) |  | $ | (14,775 | ) |  | $ | (641 | ) |  | $ | (54,691 | )
Unrealized (losses) gains arising during the period |  |  | (4,019 | ) |  |  | — |  |  |  | 322 |  |  |  | (3,697 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 352 |  |  |  | 134 |  |  |  | 486 |
Balance as of October 31, 2017 |  | $ | (43,294 | ) |  | $ | (14,423 | ) |  | $ | (185 | ) |  | $ | (57,902 | )
The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net for the six months ended October 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 arising during the period |  |  | 12,065 |  |  |  | — |  |  |  | 88 |  |  |  | 12,153 |
Reclassification of realized net losses to net income |  |  | — |  |  |  | 704 |  |  |  | 305 |  |  |  | 1,009 |
Balance as of October 31, 2017 |  | $ | (43,294 | ) |  | $ | (14,423 | ) |  | $ | (185 | ) |  | $ | (57,902 | )
________
(1) | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.5 million for the three and six months ended October 31, 2017, respectively.
(2) | The tax effect on unrealized gains was $0.2 million and $0.1 million for the three and six months ended October 31, 2017, respectively. The tax effect on the reclassification of realized net losses to net income was $0.1 million and $0.2 million for the three and six months ended October 31, 2017, 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=114867106&loc=d3e526-108580 + Details
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