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Retirement Benefits - Summary of Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Retirement Benefits [Abstract]    
Interest cost $ 890 $ 845
Expected return on plan assets $ (1,312) (1,402)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Pension Cost (Reversal of Cost)  
Recognition of net loss $ 580 628
Net periodic pension expense $ 158 71
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Settlement loss included in net income  
Effect of settlement $ 4,019 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Pension Cost (Reversal of Cost)  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Pension Cost (Reversal of Cost)  
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Pension Cost (Reversal of Cost)  
Total net periodic pension expense plus special events $ 4,177 $ 71