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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, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Pension:        
Pension:        
Interest cost $ 108 $ 70 $ 218 $ 143
Expected return on plan assets (140) (114) (282) (236)
Amortization of:        
Amortization of past service costs 2 2 4 4
Amortization of net (gain) loss (1) 25 (2) 50
Net periodic benefit cost (31) (17) (62) (39)
Post Retirement:        
Pension:        
Service cost 6 11 12 22
Interest cost 16 11 31 23
Amortization of:        
Amortization of net (gain) loss (49) (2) (98) (4)
Net periodic benefit cost (27) 20 (55) 41
UNITED STATES | Pension:        
Pension:        
Interest cost 3 3 7 5
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) 1 (2) 1
Net periodic benefit cost 2 4 5 6
UNITED STATES | Post Retirement:        
Pension:        
Service cost 6 11 12 22
Interest cost 16 11 31 23
Amortization of:        
Amortization of net (gain) loss (49) (2) (98) (4)
Net periodic benefit cost (27) 20 (55) 41
U.K.. | Pension:        
Pension:        
Interest cost 105 67 211 138
Expected return on plan assets (140) (114) (282) (236)
Amortization of:        
Amortization of past service costs 2 2 4 4
Amortization of net (gain) loss 0 24 0 49
Net periodic benefit cost (33) (21) (67) (45)
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