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Pensions and Other Postretirement Benefits (Details 2)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Domestic Plan [Member] | Defined Benefit Pension Plans [Member]
Weighted-average assumptions used in determining net periodic benefit costs:
Discount rate used to determine benefit obligation	3.95%	3.85%	4.06%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Service Cost	4.20%	3.85%	4.06%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Interest Cost	3.38%	3.85%	4.06%
Expected return on plan assets	6.27%	6.27%	6.58%
Rate of compensation increase	3.78%	3.96%	4.06%
Domestic Plan [Member] | Other Postretirement Benefits Plan [Member]
Weighted-average assumptions used in determining net periodic benefit costs:
Discount rate used to determine benefit obligation	3.86%	3.80%	4.04%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Service Cost	4.06%	3.80%	4.04%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Interest Cost	3.24%	3.80%	4.04%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Foreign Plan [Member] | Defined Benefit Pension Plans [Member]
Weighted-average assumptions used in determining net periodic benefit costs:
Discount rate used to determine benefit obligation	3.22%	3.60%	3.51%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Service Cost	3.39%	3.60%	3.51%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Interest Cost	2.60%	3.60%	3.51%
Expected return on plan assets	5.00%	5.25%	5.65%
Rate of compensation increase	3.00%	3.00%	3.00%
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Weighted-average assumptions used in determining net periodic benefit costs:
Discount rate used to determine benefit obligation	3.19%	3.50%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Service Cost	3.70%	3.50%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Interest Cost	2.58%	3.50%	3.50%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%

X

- Definition

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Used to Determine Interest Cost

+ References

No definition available.

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- Definition

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+ References

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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