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Pension and Retirement Plans - Amounts in consolidated balance sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | $ 2,201 | $ 1,958
Accrued benefit liability | (1,382) | (1,349)
Defined Benefit Plan, Net | 819 | 609
Deferred tax | 235 | 303
Accumulated other comprehensive income | 80 | 86
Net amount recognized | 1,134 | 998
Accumulated benefit obligation | (10,547) | (9,425)
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 2,041 | 1,756
Deferred tax | 23 | 26
Accumulated other comprehensive income | 224 | 326
Net amount recognized | 2,288 | 2,108
Accumulated benefit obligation | (9,325) | (8,278)
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,222) | (1,147)
Deferred tax | 212 | 277
Accumulated other comprehensive income | (144) | (240)
Net amount recognized | (1,154) | (1,110)
Accumulated benefit obligation | (1,222) | (1,147)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 2,201 | 1,958
Deferred tax | 0 | 0
Accumulated other comprehensive income | 212 | 318
Net amount recognized | 2,413 | 2,276
Accumulated benefit obligation | (9,165) | (8,076)
International | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 2,201 | 1,958
Deferred tax | 0 | 0
Accumulated other comprehensive income | 212 | 318
Net amount recognized | 2,413 | 2,276
Accumulated benefit obligation | (9,165) | (8,076)
International | Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | 0 | 0
Deferred tax | 0 | 0
Accumulated other comprehensive income | 0 | 0
Net amount recognized | 0 | 0
Accumulated benefit obligation | 0 | 0
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,382) | (1,349)
Deferred tax | 235 | 303
Accumulated other comprehensive income | (132) | (232)
Net amount recognized | (1,279) | (1,278)
Accumulated benefit obligation | (1,382) | (1,349)
U.S. | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (160) | (202)
Deferred tax | 23 | 26
Accumulated other comprehensive income | 12 | 8
Net amount recognized | (125) | (168)
Accumulated benefit obligation | (160) | (202)
U.S. | Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,222) | (1,147)
Deferred tax | 212 | 277
Accumulated other comprehensive income | (144) | (240)
Net amount recognized | (1,154) | (1,110)
Accumulated benefit obligation | $ (1,222) | $ (1,147)

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