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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension:        
Pension:        
Interest cost $ 114 $ 70 $ 332 $ 213
Expected return on plan assets (148) (118) (430) (354)
Amortization of:        
Amortization of past service costs 1 2 5 6
Amortization of net (gain) loss (1) 24 (3) 74
Net periodic benefit cost (34) (22) (96) (61)
Post Retirement:        
Pension:        
Service cost 19 9 31 31
Interest cost 4 12 35 35
Amortization of:        
Amortization of net (gain) loss 84 (10) (14) (14)
Net periodic benefit cost 107 11 52 52
UNITED STATES | Pension:        
Pension:        
Interest cost 4 2 11 7
Expected return on plan assets 0 0 0 0
Amortization of:        
Amortization of past service costs 0 0 0 0
Amortization of net (gain) loss (1) 0 (3) 1
Net periodic benefit cost 3 2 8 8
UNITED STATES | Post Retirement:        
Pension:        
Service cost 19 9 31 31
Interest cost 4 12 35 35
Amortization of:        
Amortization of net (gain) loss 84 (10) (14) (14)
Net periodic benefit cost 107 11 52 52
U.K.. | Pension:        
Pension:        
Interest cost 110 68 321 206
Expected return on plan assets (148) (118) (430) (354)
Amortization of:        
Amortization of past service costs 1 2 5 6
Amortization of net (gain) loss 0 24 0 73
Net periodic benefit cost (37) (24) (104) (69)
U.K.. | Post Retirement:        
Pension:        
Service cost 0 0 0 0
Interest cost 0 0 0 0
Amortization of:        
Amortization of net (gain) loss 0 0 0 0
Net periodic benefit cost $ 0 $ 0 $ 0 $ 0