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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
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	$ 621,877	$ 624,431
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	2,251	1,762
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 405,998	417,686
Equity Securities [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	50.00%
Fixed Income Securities and Cash [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	50.00%
U.S. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 213,628	204,983	$ 200,001
U.S. [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	213,628	204,983
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	109,490	95,933
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	104,138	100,295
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	0	8,755
Non-U.S. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	408,249	419,448	$ 390,133
Non-U.S. [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	2,251	1,762
Non-U.S. [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	405,998	417,686
Non-U.S. [Member] | U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	39,652	31,203
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	39,652	31,203
Non-U.S. [Member] | Non-U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	117,575	96,387
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	117,575	96,387
Non-U.S. [Member] | Balanced Managed Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	48,550	91,743
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	0	0
Non-U.S. [Member] | Balanced Managed Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	48,550	91,743
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	200,575	197,804
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	855	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	199,720	197,804
Non-U.S. [Member] | Real Estate/Other [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	501	549
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	501	549
Non-U.S. [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,396	1,762
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	1,396	1,762
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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Topic 715
-SubTopic 20
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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.

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