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Restructuring and Related Charges, Activity for Restructuring and Reinvestment Program Liability (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
(Credits) charges | $ (6,086) | $ 25,729
Restructuring and Reinvestment Program [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, beginning of period | 20,051 |
(Credits) charges | (6,086) | 25,729
Payments | (5,518) |
Foreign translation & reclassifications | 254 |
Restructuring liability, end of period | 8,701 |
Restructuring and Reinvestment Program [Member] | Severance [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, beginning of period | 17,279 |
(Credits) charges | (5,778) | 24,721
Payments | (4,928) |
Foreign translation & reclassifications | (278) |
Restructuring liability, end of period | 6,295 |
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, beginning of period | 0 |
(Credits) charges | 135 | 1,521
Payments | (41) |
Foreign translation & reclassifications | 0 |
Restructuring liability, end of period | 94 |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, beginning of period | 2,772 |
(Credits) charges | (443) | $ (513)
Payments | (549) |
Foreign translation & reclassifications | 532 |
Restructuring liability, end of period | 2,312 |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] | Other Accrued Liabilities [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, end of period | 1,000 |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] | Other Long-Term Liabilities [Member] |  |
Activity for Restructuring and Reinvestment Program liability [Roll Forward] |  |
Restructuring liability, end of period | $ 1,300 |

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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/disclosureRef -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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140904-122747 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140904-122747 + Details
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