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Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | $ 665 |  | $ 1,146 |
Restructuring charges, net | 30,577 | $ (418) | 30,577 | $ 9,468
Reductions for cash payments | (8,053) |  | (8,515) |
Non-cash items | (1,690) |  | (1,690) |
Exchange rate fluctuations | (179) |  | (198) |
Liability, Ending period | 21,320 |  | 21,320 |
Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 156 |  | 375 |
Restructuring charges, net | 29,877 |  | 29,877 |
Reductions for cash payments | (7,962) |  | (8,176) |
Non-cash items | (1,690) |  | (1,690) |
Exchange rate fluctuations | (119) |  | (124) |
Liability, Ending period | 20,262 |  | 20,262 |
Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 509 |  | 771 |
Restructuring charges, net | 700 |  | 700 |
Reductions for cash payments | (91) |  | (339) |
Exchange rate fluctuations | (60) |  | (74) |
Liability, Ending period | $ 1,058 |  | $ 1,058 |

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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