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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension:    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 107 $ 115
Expected return on plan assets (122) (150)
Amortization of past service costs 2 2
Amortization of net gain (2) (1)
Net periodic (benefit) cost (15) (34)
Pension: | United Kingdom    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 105 112
Expected return on plan assets (122) (150)
Amortization of past service costs 2 2
Amortization of net gain 0 0
Net periodic (benefit) cost (15) (36)
Pension: | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 2 3
Expected return on plan assets 0 0
Amortization of past service costs 0 0
Amortization of net gain (2) (1)
Net periodic (benefit) cost   2
Post Retirement:    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7 6
Interest cost 15 16
Amortization of net gain (30) (43)
Net periodic (benefit) cost (8) (21)
Post Retirement: | United Kingdom    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 0 0
Amortization of net gain 0 0
Net periodic (benefit) cost 0 0
Post Retirement: | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7 6
Interest cost 15 16
Amortization of net gain (30) (43)
Net periodic (benefit) cost $ (8) $ (21)