Retirement Plans - Expected Employer Contributions and Benefit Payments and Other Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, next fiscal year	$ 15,000
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	29,734
2026	28,767
2027	29,582
2028	29,832
2029	31,049
2030–2034	167,032
Total	315,996
Defined Contribution Savings Plans [Abstract]
Defined contribution plan, cost	27,000	$ 30,700	$ 30,300
US
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	15,887
2026	15,648
2027	15,659
2028	15,700
2029	15,781
2030–2034	76,966
Total	155,641
Retiree Health Benefits [Abstract]
Pension expense	3,574	3,459	(230)
Non-US
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2025	13,847
2026	13,119
2027	13,923
2028	14,132
2029	15,268
2030–2034	90,066
Total	160,355
Retiree Health Benefits [Abstract]
Pension expense	2,874	(6,866)	(10,900)
Non-US | Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, next fiscal year	11,800
Postretirement Life Insurance and Health Care Benefits
Retiree Health Benefits [Abstract]
Accumulated post-retirement benefit obligation	600	700
Pension expense	$ (100)	$ (100)	$ (100)