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Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Jan. 31, 2017
Components Of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss were as follows:
|  | January 31, 2017 |  |  | April 30, 2016 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | (55,919 | ) |  | $ | (36,339 | )
Deferred compensation and pension plan adjustments, net of tax |  |  | (20,180 | ) |  |  | (21,572 | )
Accumulated other comprehensive loss, net |  | $ | (76,099 | ) |  | $ | (57,911 | )
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 January 31, 2017:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plans (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Accumulated Other Comprehensive Income/(Loss) |
|  | (in thousands) |
Balance as of October 31, 2016 |  | $ | (54,598 | ) |  | $ | (20,645 | ) |  | $ | — |  |  | $ | (75,243 | )
Unrealized losses arising during the period |  |  | (1,321 | ) |  |  | — |  |  |  | — |  |  |  | (1,321 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 465 |  |  |  | — |  |  |  | 465 |
Balance as of January 31, 2017 |  | $ | (55,919 | ) |  | $ | (20,180 | ) |  | $ | — |  |  | $ | (76,099 | )
The following table summarizes the changes in each component of accumulated other comprehensive income (loss) for the nine months ended January 31, 2017:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plans (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Accumulated Other Comprehensive Income/(Loss) |
|  | (in thousands) |
Balance as of April 30, 2016 |  | $ | (36,339 | ) |  | $ | (21,572 | ) |  | $ | — |  |  | $ | (57,911 | )
Unrealized losses arising during the period |  |  | (19,580 | ) |  |  | — |  |  |  | — |  |  |  | (19,580 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 1,392 |  |  |  | — |  |  |  | 1,392 |
Balance as of January 31, 2017 |  | $ | (55,919 | ) |  | $ | (20,180 | ) |  | $ | — |  |  | $ | (76,099 | )
(1) | The tax effect on the reclassifications of realized net losses was $0.3 million and $0.9 million for the three and nine months ended January 31, 2017, respectively.
The following table summarizes the changes in each component of accumulated other comprehensive income (loss) for the three months ended January 31, 2016:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plans (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Accumulated Other Comprehensive Income/(Loss) |
|  | (in thousands) |
Balance as of October 31, 2015 |  | $ | (37,902 | ) |  | $ | (18,813 | ) |  | $ | — |  |  | $ | (56,715 | )
Unrealized losses arising during the period |  |  | (11,447 | ) |  |  | — |  |  |  | — |  |  |  | (11,447 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 447 |  |  |  | — |  |  |  | 447 |
Balance as of January 31, 2016 |  | $ | (49,349 | ) |  | $ | (18,366 | ) |  | $ | — |  |  | $ | (67,715 | )
The following table summarizes the changes in each component of accumulated other comprehensive income (loss) for the nine months ended January 31, 2016:
|  | Foreign Currency Translation |  |  | Deferred Compensation and Pension Plans (1) |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Accumulated Other Comprehensive Income/(Loss) |
|  | (in thousands) |
Balance as of April 30, 2015 |  | $ | (20,919 | ) |  | $ | (19,708 | ) |  | $ | 4 |  |  | $ | (40,623 | )
Unrealized losses arising during the period |  |  | (28,430 | ) |  |  | — |  |  |  | (4 | ) |  |  | (28,434 | )
Reclassification of realized net losses to net income |  |  | — |  |  |  | 1,342 |  |  |  | — |  |  |  | 1,342 |
Balance as of January 31, 2016 |  | $ | (49,349 | ) |  | $ | (18,366 | ) |  | $ | — |  |  | $ | (67,715 | )
(1) | The tax effect on the reclassifications of realized net losses was $0.3 million and $0.9 million for the three and nine months ended January 31, 2016, respectively.

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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=66004124&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=66004124&loc=d3e526-108580 + Details
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