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Retirement Plans - Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2024
--- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 486,000 | $ 476,702 |
Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 11,057 | 12,503 |
Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 300,800 | 294,933 |
NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 174,143 | 169,266 |
US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 178,883 | 174,170 | $ 173,569
US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 4,740 | 4,904 |
US | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 174,143 | 169,266 |
US | Global equity securities: Limited Partnership |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 54,652 | 56,631 |
US | Global equity securities: Limited Partnership | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 4,740 | 4,904 |
US | Global equity securities: Limited Partnership | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 49,912 | 51,727 |
US | Fixed income securities: Commingled trust funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 124,231 | 117,539 |
US | Fixed income securities: Commingled trust funds | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 124,231 | 117,539 |
Non-US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 307,117 | 302,532 | $ 293,168
Non-US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 11,057 | 12,503 |
Non-US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 296,060 | 290,029 |
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 | 11,922 | 25,110 |
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 | 11,922 | 25,110 |
Non-US | Non-US equities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 5,412 | 9,530 |
Non-US | Non-US equities | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount |  |  |
Non-US | Non-US equities | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 5,412 | 9,530 |
Non-US | Balanced managed funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 49,171 | 71,629 |
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 | 49,171 | 71,629 |
Non-US | Fixed income securities: Commingled trust funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 145,632 | 100,740 |
Non-US | Fixed income securities: Commingled trust funds | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 0 | 0 |
Non-US | Fixed income securities: Commingled trust funds | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 145,632 | 100,740 |
Non-US | Real estate/other |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 526 | 511 |
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 | 526 | 511 |
Non-US | Cash and cash equivalents |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 94,454 | 95,012 |
Non-US | Cash and cash equivalents | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 11,057 | 12,503 |
Non-US | Cash and cash equivalents | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 83,397 | $ 82,509 |

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