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Retirement Plans - Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 476,702 | $ 466,737 |
Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 12,503 | 1,328 |
Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 294,933 | 297,438 |
NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 169,266 | 167,971 |
US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 174,170 | 173,569 | $ 186,607
US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount |  |  |
US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 4,904 | 5,598 |
US | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 169,266 | 167,971 |
US | Global Equity Securities: Limited Partnership |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 56,631 | 63,836 |
US | Global Equity Securities: Limited Partnership | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount |  |  |
US | Global Equity Securities: Limited Partnership | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 4,904 | 5,598 |
US | Global Equity Securities: Limited Partnership | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 51,727 | 58,238 |
US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 117,539 | 109,733 |
US | Fixed income securities: Commingled funds | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 117,539 | 109,733 |
Non-US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 302,532 | 293,168 | $ 302,055
Non-US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 12,503 | 1,328 |
Non-US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 290,029 | 291,840 |
Non-US | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | US equities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 25,110 | 22,496 |
Non-US | US equities | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | US equities | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 25,110 | 22,496 |
Non-US | Non-US equities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 9,530 | 9,637 |
Non-US | Non-US equities | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | Non-US equities | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 9,530 | 9,637 |
Non-US | Balanced managed funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 71,629 | 60,959 |
Non-US | Balanced managed funds | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | Balanced managed funds | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 71,629 | 60,959 |
Non-US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 100,740 | 125,223 |
Non-US | Fixed income securities: Commingled funds | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | Fixed income securities: Commingled funds | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 100,740 | 125,223 |
Non-US | Real estate/other |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 511 | 480 |
Non-US | Real estate/other | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | Real estate/other | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 511 | 480 |
Non-US | Cash and cash equivalents |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 95,012 | 74,373 |
Non-US | Cash and cash equivalents | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 12,503 | 1,328 |
Non-US | Cash and cash equivalents | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 82,509 | $ 73,045 |

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