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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 1,045,300 |  |  |
Unrealized losses arising during the period | $ (5,131) |  | $ (1,351) |  | (18,259) |  | $ (16,987) |
Reclassification of realized net losses to net income | 465 |  | 448 |  | 927 |  | 895 |
Ending balance | 1,050,553 |  |  |  | 1,050,553 |  |  |
Accumulated Translation Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Beginning balance | (49,467) |  | (36,551) |  | (36,339) |  | (20,919) |
Unrealized losses arising during the period | (5,131) |  | (1,351) |  | (18,259) |  | (16,983) |
Ending balance | (54,598) |  | (37,902) |  | (54,598) |  | (37,902) |
Accumulated Defined Benefit Plans Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Beginning balance | (21,110) | [1] | (19,261) | [2] | (21,572) | [1] | (19,708) | [2]
Reclassification of realized net losses to net income | 465 | [1] | 448 | [2] | 927 | [1] | 895 | [2]
Ending balance | (20,645) | [1] | (18,813) | [2] | (20,645) | [1] | (18,813) | [2]
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  | 4 |
Unrealized losses arising during the period |  |  |  |  |  |  | (4) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Beginning balance | (70,577) |  | (55,812) |  | (57,911) |  | (40,623) |
Ending balance | $ (75,243) |  | $ (56,715) |  | $ (75,243) |  | $ (56,715) |
[1] | The tax effect on the reclassifications of realized net losses was $0.3 million and $0.6 million for the three and six months ended October 31, 2016, respectively.
[2] | The tax effect on the reclassifications of realized net losses was $0.3 million and $0.6 million for the three and six months ended October 31, 2015, respectively.

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