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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Pension plan assets/investments [Abstract]
Acceptable ranges within which asset allocations will fluctuate	5.00%
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 590,134	$ 568,407
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	17,835	10,632
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 572,299	557,775
Equity Securities [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	49.00%
Fixed Income Securities and Cash [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	50.00%
Real Estate [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	1.00%
U.S. Plans [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 200,001	215,923	$ 222,966
U.S. Plans [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
U.S. Plans [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	200,001	215,923
U.S. Plans [Member] | U.S. Commingled Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	64,125	69,550
U.S. Plans [Member] | U.S. Commingled Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
U.S. Plans [Member] | U.S. Commingled Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	64,125	69,550
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	27,272	28,741
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
U.S. Plans [Member] | Non-U.S. Commingled Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	27,272	28,741
U.S. Plans [Member] | Fixed Income Commingled Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	95,922	105,841
U.S. Plans [Member] | Fixed Income Commingled Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
U.S. Plans [Member] | Fixed Income Commingled Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	95,922	105,841
U.S. Plans [Member] | Real Estate [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	12,682	11,791
U.S. Plans [Member] | Real Estate [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
U.S. Plans [Member] | Real Estate [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	12,682	11,791
Non-U.S. Plans [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	390,133	352,484	$ 376,576
Non-U.S. Plans [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	17,835	10,632
Non-U.S. Plans [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	372,298	341,852
Non-U.S. Plans [Member] | U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	24,688
Non-U.S. Plans [Member] | U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. Plans [Member] | U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	24,688
Non-U.S. Plans [Member] | Non-U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	85,961	72,892
Non-U.S. Plans [Member] | Non-U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. Plans [Member] | Non-U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	85,961	72,892
Non-U.S. Plans [Member] | Balanced Managed Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	79,649	42,273
Non-U.S. Plans [Member] | Balanced Managed Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	10,196	10,070
Non-U.S. Plans [Member] | Balanced Managed Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	69,453	32,203
Non-U.S. Plans [Member] | Fixed Income Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	187,797	211,561
Non-U.S. Plans [Member] | Fixed Income Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. Plans [Member] | Fixed Income Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	187,797	211,561
Non-U.S. Plans [Member] | Real Estate/Other [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	489	508
Non-U.S. Plans [Member] | Real Estate/Other [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. Plans [Member] | Real Estate/Other [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	489	508
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	7,639	562
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	7,639	562
Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 0	$ 0

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- Definition

Percentage of acceptable ranges within which asset allocations will fluctuate.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Topic 715
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-Paragraph 1
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