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Pensions and Other Postretirement Benefits (Details 6) - Defined Benefit Pension Plans [Member] - USD ($) $ in Millions	Apr. 30, 2018	Apr. 30, 2017
Additional information related to the Company's defined benefit pension plans
Accumulated benefit obligation for all pension plans	$ 627.9	$ 659.6
Plans with an accumulated benefit obligation in excess of plan assets:
Accumulated benefit obligation	541.3	570.6
Fair value of plan assets	400.6	394.4
Plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	552.9	588.2
Fair value of plan assets	$ 400.6	$ 394.4

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Additional information related to company's defined benefit pension plans.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

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-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920

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