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Retirement Benefit Plans - Net Pension Expense for Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]    
Service cost $ 181 $ 24
Interest cost 1,072 1,090
Expected return on plan assets (1,046) (1,101)
Amortization of net loss 143 319
Settlement cost 60 108
Net pension expense for defined benefit plans (non-operating expense) $ 410 $ 440
Interest cost Interest cost  
Expected return on plan assets Expected return on plan assets  
Amortization of net loss Amortization of net loss  
Settlement cost Settlement cost