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Pension and Retirement Plans - Fair value of plan assets (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | $ 10,510 | $ 10,034
Cash on deposit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 64 | 428
Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 9,565 | 8,703
Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 881 | 903
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 8,327 | 7,945
Level 1 | Cash on deposit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 64 | 428
Level 1 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 8,016 | 7,251
Level 1 | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 247 | 266
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 2,183 | 2,089
Level 2 | Cash on deposit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 0 | 0
Level 2 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 1,549 | 1,452
Level 2 | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 634 | 637
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 0 | 0
Level 3 | Cash on deposit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 0 | 0
Level 3 | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | 0 | 0
Level 3 | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of the assets | $ 0 | $ 0

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