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Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2017 | Jan. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | $ 11,931 |  | $ 5,962 |
Restructuring charges, net | 3,801 | $ 30,577 | 28,321 | $ 30,577
Reductions for cash payments | (4,238) |  | (19,213) |
Increase for non-cashcharges | 584 |  |  |
Reductions for non-cash charges |  |  | (1,896) |
Exchange rate fluctuations | 483 |  | (613) |
Liability, Ending period | 12,561 |  | 12,561 |
Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 5,005 |  | 5,293 |
Restructuring charges, net |  | 29,900 | 11,472 | 29,900
Reductions for cash payments | (1,900) |  | (12,905) |
Exchange rate fluctuations | (71) |  | (826) |
Liability, Ending period | 3,034 |  | 3,034 |
Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 6,926 |  | 669 |
Restructuring charges, net | 3,801 | $ 700 | 16,849 | $ 700
Reductions for cash payments | (2,338) |  | (6,308) |
Increase for non-cashcharges | 584 |  |  |
Reductions for non-cash charges |  |  | (1,896) |
Exchange rate fluctuations | 554 |  | 213 |
Liability, Ending period | $ 9,527 |  | $ 9,527 |

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: 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=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: 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 + Details
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