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Retirement Benefits - Summary of Components of Net Periodic Pension Cost (Detail)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
USD ($)
Retirement Benefits [Abstract]  
Interest cost $ 890
Expected return on plan assets $ (1,312)
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
Net periodic pension expense $ 158
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
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