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Pension and Retirement Plans - Accrued benefit liability (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Liability, Defined Benefit Plan [Abstract] |  |
Non-current benefits assets | $ 2,201 | $ 1,958
Current accrued benefit liability | 76 | 98
Non-current accrued benefit liability | 1,306 | 1,251
Total accrued benefit liability | 1,382 | 1,349
Accumulated other comprehensive income | 80 | $ 86
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year | 185 |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 100 |

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