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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ 1,083,439 |  |  |
Ending balance |  | $ 1,177,959 |  |  |  | 1,177,959 |  |  |
Accumulated Translation Adjustment |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (43,294) |  | $ (54,598) |  | (55,359) |  | $ (36,339) |
Unrealized (losses) gains arising during the period |  | 17,793 |  | (1,321) |  | 29,858 |  | (19,580) |
Ending balance |  | (25,501) |  | (55,919) |  | (25,501) |  | (55,919) |
Accumulated Defined Benefit Plan Adjustment |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (14,423) | [1] | (20,645) | [2] | (15,127) | [1] | (21,572) | [2]
Reclassification of realized net losses to net income |  | 361 | [1] | 465 | [2] | 1,065 | [1] | 1,392 | [2]
Ending balance |  | (14,062) | [1] | (20,180) | [2] | (14,062) | [1] | (20,180) | [2]
Unrealized (Losses) Gains on Interest Rate Swap |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [3] | (185) |  |  |  | (578) |  |  |
Unrealized (losses) gains arising during the period | [3] | 973 |  |  |  | 1,061 |  |  |
Reclassification of realized net losses to net income | [3] | 104 |  |  |  | 409 |  |  |
Ending balance | [3] | 892 |  |  |  | 892 |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (57,902) |  | (75,243) |  | (71,064) |  | (57,911) |
Unrealized (losses) gains arising during the period |  | 18,766 |  | (1,321) |  | 30,919 |  | (19,580) |
Reclassification of realized net losses to net income |  | 465 |  | 465 |  | 1,474 |  | 1,392 |
Ending balance |  | $ (38,671) |  | $ (76,099) |  | $ (38,671) |  | $ (76,099) |
[1] | The tax effect on the reclassifications of realized net losses was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, respectively.
[2] | 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.
[3] | The tax effect on unrealized gains was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, respectively. The tax effect on the reclassification of realized net losses to net income was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, respectively.

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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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