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Pension and Retirement Plans - Amounts in consolidated balance sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]    
Pension benefits assets $ 1,099 $ 0
Accrued benefit liability (1,447) (4,405)
Defined Benefit Plan, Net (348)  
Deferred tax 330 95
Accumulated other comprehensive income 358 4,218
Net amount recognized 340 (92)
Accumulated benefit obligation (9,173) (16,326)
Pension:    
Defined Benefit Plan Disclosure [Line Items]    
Pension benefits assets 838  
Accrued benefit liability   (2,735)
Deferred tax 25 17
Accumulated other comprehensive income 640 4,161
Net amount recognized 1,503 1,443
Accumulated benefit obligation (7,987) (14,656)
Post Retirement:    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,186) (1,670)
Deferred tax 305 78
Accumulated other comprehensive income (282) 57
Net amount recognized (1,163) (1,535)
Accumulated benefit obligation (1,186) (1,670)
International    
Defined Benefit Plan Disclosure [Line Items]    
Pension benefits assets 1,099  
Accrued benefit liability   (2,396)
Accumulated other comprehensive income 631 4,140
Net amount recognized 1,730 1,744
Accumulated benefit obligation (7,726) (14,317)
International | Pension:    
Defined Benefit Plan Disclosure [Line Items]    
Pension benefits assets 1,099  
Accrued benefit liability   (2,396)
Accumulated other comprehensive income 631 4,140
Net amount recognized 1,730 1,744
Accumulated benefit obligation (7,726) (14,317)
UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,447) (2,009)
Deferred tax 330 95
Accumulated other comprehensive income (273) 78
Net amount recognized (1,390) (1,836)
Accumulated benefit obligation (1,447) (2,009)
UNITED STATES | Pension:    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (261) (339)
Deferred tax 25 17
Accumulated other comprehensive income 9 21
Net amount recognized (227) (301)
Accumulated benefit obligation (261) (339)
UNITED STATES | Post Retirement:    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,186) (1,670)
Deferred tax 305 78
Accumulated other comprehensive income (282) 57
Net amount recognized (1,163) (1,535)
Accumulated benefit obligation $ (1,186) $ (1,670)