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Pension and Retirement Plans - Amounts recognized in the consolidated balance sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (7,239) | $ (6,508)
Deferred tax | 56 | 114
Accumulated other comprehensive income | 6,302 | 5,298
Net amount recognized | (881) | (1,096)
Accumulated benefit obligation | (15,477) | (14,779)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (5,723) | (5,189)
Deferred tax | 15 | 21
Accumulated other comprehensive income | 6,189 | 5,264
Net amount recognized | 481 | 96
Accumulated benefit obligation | (13,961) | (13,459)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,516) | (1,320)
Deferred tax | 41 | 93
Accumulated other comprehensive income | 113 | 34
Net amount recognized | (1,362) | (1,193)
Accumulated benefit obligation | (1,516) | (1,318)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (5,209) | (4,604)
Deferred tax |  | (1)
Accumulated other comprehensive income | 6,165 | 5,251
Net amount recognized | 956 | 646
Accumulated benefit obligation | (13,447) | (12,874)
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (5,209) | (4,604)
Deferred tax |  | (1)
Accumulated other comprehensive income | 6,165 | 5,251
Net amount recognized | 956 | 646
Accumulated benefit obligation | (13,447) | (12,874)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,030) | (1,904)
Deferred tax | 56 | 115
Accumulated other comprehensive income | 137 | 47
Net amount recognized | (1,837) | (1,742)
Accumulated benefit obligation | (2,030) | (1,905)
U.S. | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (514) | (585)
Deferred tax | 15 | 22
Accumulated other comprehensive income | 24 | 13
Net amount recognized | (475) | (550)
Accumulated benefit obligation | (514) | (585)
U.S. | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,516) | (1,320)
Deferred tax | 41 | 93
Accumulated other comprehensive income | 113 | 34
Net amount recognized | (1,362) | (1,193)
Accumulated benefit obligation | $ (1,516) | $ (1,318)

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