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Retirement Plans, Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Pension plan assets/investments [Abstract]
Notice period for redemption request	7 days
Acceptable ranges within which asset allocations will fluctuate	5.00%
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	$ 646,714	$ 761,015
NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	196,978	237,129
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	8,815	6,665
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	$ 440,921	517,221
Equity Securities [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	48.00%
Fixed Income Securities and Cash [Member]
Pension plan assets/investments [Abstract]
Target allocation percentage	52.00%
US [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	$ 204,455	237,129	$ 213,946
US [Member] | NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	196,978	237,129
US [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	7,477
US [Member] | Global Equity Securities: Limited Partnership [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	85,326	121,569
US [Member] | Global Equity Securities: Limited Partnership [Member] | NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	77,849	121,569
US [Member] | Global Equity Securities: Limited Partnership [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	7,477
US [Member] | Fixed Income Securities: Commingled Trust Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	119,129	115,560
US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	119,129	115,560
Non-US [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	442,259	523,886	$ 445,480
Non-US [Member] | NAV [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	0
Non-US [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	1,338	6,665
Non-US [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	440,921	517,221
Non-US [Member] | U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	48,443	51,882
Non-US [Member] | U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	0
Non-US [Member] | U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	48,443	51,882
Non-US [Member] | Non-U.S. Equities [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	112,162	124,496
Non-US [Member] | Non-U.S. Equities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	0
Non-US [Member] | Non-U.S. Equities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	112,162	124,496
Non-US [Member] | Balanced Managed Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	94,623	103,717
Non-US [Member] | Balanced Managed Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	0
Non-US [Member] | Balanced Managed Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	94,623	103,717
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	185,192	238,027
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	1,444
Non-US [Member] | Fixed Income Securities: Commingled Trust Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	185,192	236,583
Non-US [Member] | Real Estate/Other [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	475	543
Non-US [Member] | Real Estate/Other [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	0	0
Non-US [Member] | Real Estate/Other [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	475	543
Non-US [Member] | Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	1,364	5,221
Non-US [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	1,338	5,221
Non-US [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets	$ 26	$ 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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