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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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