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Pension and Retirement Plans - Amounts recognized in the consolidated balance sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (6,792) | $ (7,239)
Deferred tax | 24 | 56
Accumulated other comprehensive income | 6,120 | 6,302
Net amount recognized | (648) | (881)
Accumulated benefit obligation | (16,532) | (15,477)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (5,089) | (5,723)
Deferred tax | 14 | 15
Accumulated other comprehensive income | 5,960 | 6,189
Net amount recognized | 885 | 481
Accumulated benefit obligation | (14,829) | (13,961)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,703) | (1,516)
Deferred tax | 10 | 41
Accumulated other comprehensive income | 160 | 113
Net amount recognized | (1,533) | (1,362)
Accumulated benefit obligation | (1,703) | (1,516)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (4,663) | (5,209)
Accumulated other comprehensive income | 5,934 | 6,165
Net amount recognized | 1,271 | 956
Accumulated benefit obligation | (14,403) | (13,447)
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (4,663) | (5,209)
Accumulated other comprehensive income | 5,934 | 6,165
Net amount recognized | 1,271 | 956
Accumulated benefit obligation | (14,403) | (13,447)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,129) | (2,030)
Deferred tax | 24 | 56
Accumulated other comprehensive income | 186 | 137
Net amount recognized | (1,919) | (1,837)
Accumulated benefit obligation | (2,129) | (2,030)
U.S. | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (426) | (514)
Deferred tax | 14 | 15
Accumulated other comprehensive income | 26 | 24
Net amount recognized | (386) | (475)
Accumulated benefit obligation | (426) | (514)
U.S. | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,703) | (1,516)
Deferred tax | 10 | 41
Accumulated other comprehensive income | 160 | 113
Net amount recognized | (1,533) | (1,362)
Accumulated benefit obligation | $ (1,703) | $ (1,516)

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