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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
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	$ 624,431	$ 590,134
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,762	17,835
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 417,686	372,298
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. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 204,983	200,001	$ 215,923
U.S. [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	204,983	200,001
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	95,933	91,397
U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	100,295	95,922
U.S. [Member] | Other: Real Estate Commingled Trust Fund [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	8,755	12,682
Non-U.S. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	419,448	390,133	$ 352,484
Non-U.S. [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,762	17,835
Non-U.S. [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	417,686	372,298
Non-U.S. [Member] | U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	31,203	28,598
Non-U.S. [Member] | U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. [Member] | U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	31,203	28,598
Non-U.S. [Member] | Non-U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	96,387	85,961
Non-U.S. [Member] | Non-U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. [Member] | Non-U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	96,387	85,961
Non-U.S. [Member] | Balanced Managed Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	91,743	79,649
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	10,196
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	91,743	69,453
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	197,804	187,797
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	197,804	187,797
Non-U.S. [Member] | Real Estate/Other [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	549	489
Non-U.S. [Member] | Real Estate/Other [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. [Member] | Real Estate/Other [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	549	489
Non-U.S. [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,762	7,639
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,762	7,639
Non-U.S. [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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Percentage of acceptable ranges within which asset allocations will fluctuate.

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- Definition

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 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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