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Restructuring Charges, Net - Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | $ 13,695 | $ 5,962 |
Restructuring charges, net | 78 | 34,600 | $ 33,013
Reductions for cash payments | (10,591) | (23,677) |
Non-cash items |  | (2,024) |
Exchange rate fluctuations | 814 | (1,166) |
Liability, Ending period | 3,996 | 13,695 | 5,962
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | 5,341 | 5,293 |
Restructuring charges, net |  | 15,963 | 32,100
Reductions for cash payments | (4,541) | (14,974) |
Exchange rate fluctuations | 251 | (941) |
Liability, Ending period | 1,051 | 5,341 | 5,293
Facilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | 8,354 | 669 |
Restructuring charges, net | 78 | 18,637 | 900
Reductions for cash payments | (6,050) | (8,703) |
Non-cash items |  | (2,024) |
Exchange rate fluctuations | 563 | (225) |
Liability, Ending period | $ 2,945 | $ 8,354 | $ 669

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- Definition 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 Reference 2: 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 + Details
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