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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Thousands

12 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Apr. 30, 2016

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

$ 1,083,439

Ending balance

1,216,607

$ 1,083,439

Accumulated Translation Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

^[1]

(55,359)

(36,339)

$ (20,919)

Unrealized (losses) gains arising during the period

^[1]

22,960

(19,020)

(15,420)

Ending balance

^[1]

(32,399)

(55,359)

(36,339)

Accumulated Defined Benefit Plan Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(15,127)

(21,572)

(19,708)

Unrealized (losses) gains arising during the period

4,813

4,584

(3,653)

Reclassification of realized net losses to net income

1,241

1,861

1,789

Ending balance

(9,073)

(15,127)

(21,572)

Accumulated Net Unrealized Investment Gain (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

4

Unrealized (losses) gains arising during the period

(4)

Unrealized (Losses) Gains on Interest Rate Swap

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

^[2]

(578)

Unrealized (losses) gains arising during the period

^[2]

1,465

(635)

Reclassification of realized net losses to net income

^[2]

450

57

Ending balance

^[2]

1,337

(578)

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(71,064)

(57,911)

(40,623)

Unrealized (losses) gains arising during the period

29,238

(15,071)

(19,077)

Reclassification of realized net losses to net income

1,691

1,918

1,789

Ending balance

$ (40,135)

$ (71,064)

$ (57,911)

[1]	The tax effects on unrealized gains (losses) were $2.5 million, $1.9 million and $(2.3) million as of April 30, 2018, 2017 and 2016, respectively. The tax effects on reclassifications of realized net losses were $0.8 million, $1.2 million and $1.1 million as of April 30, 2018, 2017 and 2016, respectively.
[2]	The tax effects on unrealized gains (losses) were $0.8 million and $(0.4) million as of April 30, 2018 and 2017, respectively. The tax effect on the reclassification of realized net losses to net income was $0.3 million as of April 30, 2018.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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