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Retirement Plans - Expected Employer Contributions and Benefit Payments and Other Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, next fiscal year	$ 15,500
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2024	27,875
2025	29,593
2026	28,457
2027	29,280
2028	29,967
2029–2033	162,877
Total	308,049
Defined Contribution Savings Plans [Abstract]
Defined contribution plan, cost	30,700	$ 30,300	$ 24,300
US
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2024	15,889
2025	15,529
2026	15,333
2027	15,398
2028	15,482
2029–2033	76,729
Total	154,360
Retiree Health Benefits [Abstract]
Pension expense	3,459	(230)	882
Non-US
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2024	11,986
2025	14,064
2026	13,124
2027	13,882
2028	14,485
2029–2033	86,148
Total	153,689
Retiree Health Benefits [Abstract]
Pension expense	(6,866)	(10,900)	(12,100)
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	700	1,300
Pension expense	$ (100)	$ (100)	$ (100)

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