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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

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