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Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | $ 5,962 | $ 1,146 |
Restructuring charges, net | 34,600 | 33,013 | $ 9,468
Reductions for cash payments | (23,677) | (26,459) |
Non-cash items | (2,024) | (1,843) |
Exchange rate fluctuations | (1,166) | 105 |
Liability, Ending period | 13,695 | 5,962 | 1,146
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | 5,293 | 375 |
Restructuring charges, net | 15,963 | 32,151 | 9,200
Reductions for cash payments | (14,974) | (25,625) |
Non-cash items |  | (1,752) |
Exchange rate fluctuations | (941) | 144 |
Liability, Ending period | 5,341 | 5,293 | 375
Facilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Liability, Beginning period | 669 | 771 |
Restructuring charges, net | 18,637 | 862 | 300
Reductions for cash payments | (8,703) | (834) |
Non-cash items | (2,024) | (91) |
Exchange rate fluctuations | (225) | (39) |
Liability, Ending period | $ 8,354 | $ 669 | $ 771

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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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