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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
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	$ 659,426	$ 621,877
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	5,565	2,251
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 439,915	405,998
Equity Securities [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	45.00%
Fixed Income Securities and Cash [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	55.00%
U.S. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	$ 213,946	213,628	$ 204,983
U.S. [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	213,946	213,628
U.S. [Member] | Global Equity Securites: Limited Partnership [Member] | Investments Measured at NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	110,965	109,490
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	102,981	104,138
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	0
Non-U.S. [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	445,480	408,249	$ 419,448
Non-U.S. [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	5,565	2,251
Non-U.S. [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	439,915	405,998
Non-U.S. [Member] | U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	36,842	39,652
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	36,842	39,652
Non-U.S. [Member] | Non-U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	103,460	117,575
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	103,460	117,575
Non-U.S. [Member] | Balanced Managed Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	44,989	48,550
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	44,989	48,550
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	257,565	200,575
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	3,431	855
Non-U.S. [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	254,134	199,720
Non-U.S. [Member] | Real Estate/Other [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	490	501
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	490	501
Non-U.S. [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	2,134	1,396
Non-U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value of Plan Assets	2,134	1,396
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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