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Pension and Retirement Plans - Amounts recognized in the consolidated balance sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (4,405) $ (6,792)
Deferred tax 95 24
Accumulated other comprehensive income 4,218 6,120
Net amount recognized (92) (648)
Accumulated benefit obligation (16,326) (16,532)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (2,735) (5,089)
Deferred tax 17 14
Accumulated other comprehensive income 4,161 5,960
Net amount recognized 1,443 885
Accumulated benefit obligation (14,656) (14,829)
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,670) (1,703)
Deferred tax 78 10
Accumulated other comprehensive income 57 160
Net amount recognized (1,535) (1,533)
Accumulated benefit obligation (1,670) (1,703)
International    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (2,396) (4,663)
Accumulated other comprehensive income 4,140 5,934
Net amount recognized 1,744 1,271
Accumulated benefit obligation (14,317) (14,403)
International | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (2,396) (4,663)
Accumulated other comprehensive income 4,140 5,934
Net amount recognized 1,744 1,271
Accumulated benefit obligation (14,317) (14,403)
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (2,009) (2,129)
Deferred tax 95 24
Accumulated other comprehensive income 78 186
Net amount recognized (1,836) (1,919)
Accumulated benefit obligation (2,009) (2,129)
U.S. | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (339) (426)
Deferred tax 17 14
Accumulated other comprehensive income 21 26
Net amount recognized (301) (386)
Accumulated benefit obligation (339) (426)
U.S. | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,670) (1,703)
Deferred tax 78 10
Accumulated other comprehensive income 57 160
Net amount recognized (1,535) (1,533)
Accumulated benefit obligation $ (1,670) $ (1,703)