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Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	$ 13,695
Restructuring charges, net	280	$ 24,520
Reductions for cash payments	(4,066)
Exchange rate fluctuations	409
Liability, Ending period	10,318
Severance
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	5,341
Reductions for cash payments	(2,602)
Exchange rate fluctuations	165
Liability, Ending period	2,904
Facilities
Restructuring Cost and Reserve [Line Items]
Liability, Beginning period	8,354
Restructuring charges, net	280
Reductions for cash payments	(1,464)
Exchange rate fluctuations	244
Liability, Ending period	$ 7,414

X

- 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
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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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

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-Topic 420
-SubTopic 10
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