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Pension and Retirement Plans - Amounts in consolidated balance sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | $ 1,958 | $ 1,099
Accrued benefit liability | (1,349) | (1,447)
Defined Benefit Plan, Net | 609 | (348)
Deferred tax | 303 | 330
Accumulated other comprehensive income | 86 | 358
Net amount recognized | 998 | 340
Accumulated benefit obligation | (9,425) | (9,173)
Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 1,756 | 838
Deferred tax | 26 | 25
Accumulated other comprehensive income | 326 | 640
Net amount recognized | 2,108 | 1,503
Accumulated benefit obligation | (8,278) | (7,987)
Post Retirement: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,147) | (1,186)
Deferred tax | 277 | 305
Accumulated other comprehensive income | (240) | (282)
Net amount recognized | (1,110) | (1,163)
Accumulated benefit obligation | (1,147) | (1,186)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 1,958 | 1,099
Deferred tax | 0 | 0
Accumulated other comprehensive income | 318 | 631
Net amount recognized | 2,276 | 1,730
Accumulated benefit obligation | (8,076) | (7,726)
International | Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension benefits assets | 1,958 | 1,099
Deferred tax | 0 | 0
Accumulated other comprehensive income | 318 | 631
Net amount recognized | 2,276 | 1,730
Accumulated benefit obligation | (8,076) | (7,726)
International | Post Retirement: |  |
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
UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,349) | (1,447)
Deferred tax | 303 | 330
Accumulated other comprehensive income | (232) | (273)
Net amount recognized | (1,278) | (1,390)
Accumulated benefit obligation | (1,349) | (1,447)
UNITED STATES | Pension: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (202) | (261)
Deferred tax | 26 | 25
Accumulated other comprehensive income | 8 | 9
Net amount recognized | (168) | (227)
Accumulated benefit obligation | (202) | (261)
UNITED STATES | Post Retirement: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,147) | (1,186)
Deferred tax | 277 | 305
Accumulated other comprehensive income | (240) | (282)
Net amount recognized | (1,110) | (1,163)
Accumulated benefit obligation | $ (1,147) | $ (1,186)

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