Restructuring and Related Charges, Activity for Restructuring and Reinvestment Program Liability (Details) $ in Thousands	3 Months Ended
Jul. 31, 2020 USD ($)
Business Optimization Program [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	$ 18,062
Charges	1,110
Payments	(7,172)
Foreign translation & other adjustments	476
Restructuring liability, end of period	12,476
Business Optimization Program [Member] \| Accrued Employment Costs [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, end of period	12,000
Business Optimization Program [Member] \| Other Long-term Liabilities [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, end of period	300
Business Optimization Program [Member] \| Severance and Termination Benefits [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	17,632
Charges	1,110
Payments	(6,966)
Foreign translation & other adjustments	478
Restructuring liability, end of period	12,254
Business Optimization Program [Member] \| Other Activities [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	430
Charges	0
Payments	(206)
Foreign translation & other adjustments	(2)
Restructuring liability, end of period	222
Restructuring and Reinvestment Program [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	1,590
Charges	33
Payments	(888)
Foreign translation & other adjustments	190
Restructuring liability, end of period	925
Restructuring and Reinvestment Program [Member] \| Severance and Termination Benefits [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	1,360
Charges	33
Payments	(888)
Foreign translation & other adjustments	62
Restructuring liability, end of period	567
Restructuring and Reinvestment Program [Member] \| Other Activities [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, beginning of period	230
Charges	0
Payments	0
Foreign translation & other adjustments	128
Restructuring liability, end of period	358
Restructuring and Reinvestment Program [Member] \| Other Activities [Member] \| Other Long-term Liabilities [Member]
Activity for Restructuring and Related Charges Liability [Roll Forward]
Restructuring liability, end of period	$ 400

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.

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=121586364&loc=d3e3367-108585

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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=121586364&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

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

Reference 1: 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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