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Restructuring (Recoveries) Charges, Net - Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2017	Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	$ 10,318	$ 13,695
Restructuring (recoveries) charges, net	(202)	78	$ 24,520
Reductions for cash payments	(4,146)	(8,212)
Exchange rate fluctuations	287	696
Liability, Ending period	6,257	6,257
Severance
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	2,904	5,341
Reductions for cash payments	(1,345)	(3,947)
Exchange rate fluctuations	(18)	147
Liability, Ending period	1,541	1,541
Facilities
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	7,414	8,354
Restructuring (recoveries) charges, net	(202)	78
Reductions for cash payments	(2,801)	(4,265)
Exchange rate fluctuations	305	549
Liability, Ending period	$ 4,716	$ 4,716

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Restructuring charges (recoveries) net.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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-Name Accounting Standards Codification
-Topic 420
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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