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Pension and Retirement Plans - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Pension and Retirement Plans    
Number of years defined benefit plans are closed to newly hired employees 2 years  
Number of years supplementary retirement plans are closed to newly hired employees 2 years  
Life insurance amount due $ 1,382 $ 1,349
Individuals below 65 years    
Pension and Retirement Plans    
Defined benefit plan, health care cost trend rate 7.50%  
Defined benefit plan, increase in health care cost trend rate 0.50%  
Individuals at and above 65 years    
Pension and Retirement Plans    
Defined benefit plan, health care cost trend rate 4.54%  
U.S.    
Pension and Retirement Plans    
Life insurance amount due $ 1,382 1,349
U.S. | Pension:    
Pension and Retirement Plans    
Loans, Gross, Insurance Policy 3,800 3,700
Life insurance amount due $ 160 $ 202