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Retirement Benefits - Summary of Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Retirement Benefits [Abstract]    
Interest cost $ 845 $ 710
Expected return on plan assets (1,402) (1,604)
Recognition of net loss 628 539
Net periodic pension expense (income) $ 71 $ (355)
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)