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Retirement Plans - Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Notice period for redemption request | 7 days |  |
Acceptable ranges within which asset allocations will fluctuate | 5.00% |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 466,737 | $ 488,662 |
Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,328 | 1,902 |
Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 297,438 | 306,690 |
NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 167,971 | 180,070 |
Equity securities: |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Target allocation percentage | 30.00% |  |
Fixed Income Securities and Cash |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Target allocation percentage | 70.00% |  |
US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 173,569 | 186,607 | $ 204,455
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 | 5,598 | 6,537 |
US | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 167,971 | 180,070 |
US | Global Equity Securities: Limited Partnership |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 63,836 | 80,006 |
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 | 5,598 | 6,537 |
US | Global Equity Securities: Limited Partnership | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 58,238 | 73,469 |
US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 109,733 | 106,601 |
US | Fixed income securities: Commingled funds | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 109,733 | 106,601 |
Non-US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 293,168 | 302,055 | $ 442,259
Non-US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,328 | 1,902 |
Non-US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 291,840 | 300,153 |
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 | 22,496 | 48,806 |
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 | 22,496 | 48,806 |
Non-US | Non-US equities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 9,637 | 39,618 |
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 | 9,637 | 39,618 |
Non-US | Balanced managed funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 60,959 | 58,036 |
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 | 60,959 | 58,036 |
Non-US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 125,223 | 133,878 |
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 | 125,223 | 133,878 |
Non-US | Real estate/other |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 480 | 496 |
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 | 480 | 496 |
Non-US | Cash and cash equivalents |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 74,373 | 21,221 |
Non-US | Cash and cash equivalents | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,328 | 1,902 |
Non-US | Cash and cash equivalents | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 73,045 | $ 19,319 |

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