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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | $ 1,083,439 |
Ending balance |  | 1,124,649 |
Accumulated Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (55,359) | $ (36,339)
Unrealized gains (losses) arising during the period |  | 16,084 | (13,128)
Ending balance |  | (39,275) | (49,467)
Accumulated Defined Benefit Plan Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [1] | (15,127) | (21,572)
Reclassification of realized net losses to net income | [1] | 352 | 462
Ending balance | [1] | (14,775) | (21,110)
Unrealized (Losses) on Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [2] | (578) |
Unrealized gains (losses) arising during the period | [2] | (234) |
Reclassification of realized net losses to net income | [2] | 171 |
Ending balance | [2] | (641) |
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (71,064) | (57,911)
Unrealized gains (losses) arising during the period |  | 15,850 | (13,128)
Reclassification of realized net losses to net income |  | 523 | 462
Ending balance |  | $ (54,691) | $ (70,577)
[1] | The tax effect on the reclassifications of realized net losses was $0.2 million and $0.3 million for the three months ended July 31, 2017 and 2016, respectively.
[2] | The tax effect on unrealized (losses) was $0.1 million for the three months ended July 31, 2017. The tax effect on the reclassification of realized net losses to net income was $0.1 million for the three months ended July 31, 2017.

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: 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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