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Restructuring Charges, Net - Changes In Restructuring Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | $ 6,257 |  | $ 13,695 |
Restructuring charges, net |  | $ 3,801 | 78 | $ 28,321
Reductions for cash payments | (1,294) |  | (9,506) |
Exchange rate fluctuations | 178 |  | 874 |
Liability, Ending period | 5,141 |  | 5,141 |
Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 1,541 |  | 5,341 |
Reductions for cash payments | (231) |  | (4,178) |
Exchange rate fluctuations | 123 |  | 270 |
Liability, Ending period | 1,433 |  | 1,433 |
Facilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Liability, Beginning period | 4,716 |  | 8,354 |
Restructuring charges, net |  |  | 78 |
Reductions for cash payments | (1,063) |  | (5,328) |
Exchange rate fluctuations | 55 |  | 604 |
Liability, Ending period | $ 3,708 |  | $ 3,708 |

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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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + 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 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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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve. + 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)(2)) -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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