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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