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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Pension:        
Pension and Retirement Plans        
Interest cost $ 106 $ 112 $ 213 $ 227
Expected return on plan assets (122) (146) (244) (296)
Amortization of past service costs 2 2 4 4
Amortization of net gain (1) (2) (3) (3)
Net periodic (benefit) cost (15) (34) (30) (68)
Pension: | United Kingdom        
Pension and Retirement Plans        
Interest cost 104 109 209 221
Expected return on plan assets (122) (146) (244) (296)
Amortization of past service costs 2 2 4 4
Amortization of net gain 0 0 0 0
Net periodic (benefit) cost (16) (35) (31) (71)
Pension: | U.S.        
Pension and Retirement Plans        
Interest cost 2 3 4 6
Expected return on plan assets 0 0 0 0
Amortization of past service costs 0 0 0 0
Amortization of net gain (1) (2) (3) (3)
Net periodic (benefit) cost 1 1 1 3
Post Retirement:        
Pension and Retirement Plans        
Service cost 6 6 13 12
Interest cost 15 16 30 32
Amortization of net gain (30) (43) (60) (86)
Net periodic (benefit) cost (9) (21) (17) (42)
Post Retirement: | United Kingdom        
Pension and Retirement Plans        
Service cost 0 0 0 0
Interest cost 0 0 0 0
Amortization of net gain 0 0 0 0
Net periodic (benefit) cost 0 0 0 0
Post Retirement: | U.S.        
Pension and Retirement Plans        
Service cost 6 6 13 12
Interest cost 15 16 30 32
Amortization of net gain (30) (43) (60) (86)
Net periodic (benefit) cost $ (9) $ (21) $ (17) $ (42)