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Retirement Plans - Pension Plan Assets/Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Notice period for redemption request | 7 years |  |
Acceptable ranges within which asset allocations will fluctuate | 5.00% |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 488,662 | $ 646,714 |
Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,902 | 8,815 |
Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 306,690 | 440,921 |
NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 180,070 | 196,978 |
Equity securities: |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Target allocation percentage | 47.00% |  |
Fixed Income Securities and Cash |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Target allocation percentage | 53.00% |  |
US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 186,607 | 204,455 | $ 237,129
US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 6,537 | 7,477 |
US | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 180,070 | 196,978 |
US | Global Equity Securities: Limited Partnership |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 80,006 | 85,326 |
US | Global Equity Securities: Limited Partnership | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 6,537 | 7,477 |
US | Global Equity Securities: Limited Partnership | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 73,469 | 77,849 |
US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 106,601 | 119,129 |
US | Fixed income securities: Commingled funds | NAV |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 106,601 | 119,129 |
Non-US |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 302,055 | 442,259 | $ 523,886
Non-US | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,902 | 1,338 |
Non-US | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 300,153 | 440,921 |
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 | 48,806 | 48,443 |
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 | 48,806 | 48,443 |
Non-US | Non-US equities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 39,618 | 112,162 |
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 | 39,618 | 112,162 |
Non-US | Balanced managed funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 58,036 | 94,623 |
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 | 58,036 | 94,623 |
Non-US | Fixed income securities: Commingled funds |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 133,878 | 185,192 |
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 | 133,878 | 185,192 |
Non-US | Real estate/other |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 496 | 475 |
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 | 496 | 475 |
Non-US | Cash and cash equivalents |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 21,221 | 1,364 |
Non-US | Cash and cash equivalents | Level 1 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | 1,902 | 1,338 |
Non-US | Cash and cash equivalents | Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Defined benefit plan, plan assets, amount | $ 19,319 | $ 26 |

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