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Retirement Benefit Plans - Roll Forward of Defined Benefit Pension Plan Obligations and Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Benefit obligations:    
Benefit obligations at beginning of year $ 20,345 $ 22,492
Service cost 181 24
Interest cost 1,072 1,090
Actuarial loss (gain) 1,313 (1,463)
Benefits paid (2,023) (1,798)
Benefit obligations at end of year 20,888 20,345
Plan assets:    
Plan assets at beginning of year 17,194 17,937
Actual return on plan assets 3,076 979
Employer contributions 129 77
Benefits paid (2,023) (1,799)
Plan assets at end of year 18,376 17,194
Underfunded status at end of year $ (2,512) $ (3,151)