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

12 Months Ended

Apr. 30, 2017

Apr. 30, 2016

Apr. 30, 2015

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

$ 1,045,300

Unrealized (losses) gains arising during the period

(15,071)

$ (19,077)

$ (40,122)

Reclassification of realized net losses to net income

1,918

1,789

1,887

Ending balance

1,083,439

1,045,300

Accumulated Translation Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(36,339)

(20,919)

15,604

Unrealized (losses) gains arising during the period

(19,020)

(15,420)

(36,523)

Ending balance

(55,359)

(36,339)

(20,919)

Accumulated Defined Benefit Plan Adjustment

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

^[1]

(21,572)

(19,708)

(18,006)

Unrealized (losses) gains arising during the period

^[1]

4,584

(3,653)

(3,589)

Reclassification of realized net losses to net income

^[1]

1,861

1,789

1,887

Ending balance

^[1]

(15,127)

(21,572)

(19,708)

Accumulated Net Unrealized Investment Gain (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

4

14

Unrealized (losses) gains arising during the period

(4)

(10)

Ending balance

4

Unrealized Losses on Interest Rate Swap

Accumulated Other Comprehensive Income (Loss) [Line Items]

Unrealized (losses) gains arising during the period

^[2]

(635)

Reclassification of realized net losses to net income

^[2]

57

Ending balance

^[2]

(578)

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(57,911)

(40,623)

(2,388)

Unrealized (losses) gains arising during the period

(15,071)

(19,077)

(40,122)

Reclassification of realized net losses to net income

1,918

1,789

1,887

Ending balance

$ (71,064)

$ (57,911)

$ (40,623)

[1]	The tax effects on unrealized gains (losses) were $1.9 million, $(2.3) million and $(2.3) million as of April 30, 2017, 2016 and 2015, respectively. The tax effects on reclassifications of realized net losses were $1.2 million, $1.1 million and $1.2 million as of April 30, 2017, 2016 and 2015, respectively.
[2]	The tax effects on unrealized (losses) were $(0.4) million as of April 30, 2017.

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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=66004921&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=66004124&loc=SL7669686-108580

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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

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-Publisher FASB
-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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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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