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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension        
Pension:        
Interest cost $ 66 $ 67 $ 190 $ 207
Expected return on plan assets (103) (72) (299) (220)
Amortization of:        
Amortization of past service costs 2 2 6 6
Amortization of net gain (loss) 48 46 139 144
Net periodic benefit cost 13 43 36 137
Post Retirement        
Pension:        
Service cost 8 10 31 29
Interest cost 13 12 35 35
Amortization of:        
Amortization of net gain (loss) (39) 4 (14) 16
Net periodic benefit cost (18) 26 52 80
U.S. | Pension        
Pension:        
Interest cost 3 3 8 11
Amortization of:        
Amortization of net gain (loss) 1   3 2
Net periodic benefit cost 4 3 11 13
U.S. | Post Retirement        
Pension:        
Service cost 8 10 31 29
Interest cost 13 12 35 35
Amortization of:        
Amortization of net gain (loss) (39) 4 (14) 16
Net periodic benefit cost (18) 26 52 80
U.K. | Pension        
Pension:        
Interest cost 63 64 182 196
Expected return on plan assets (103) (72) (299) (220)
Amortization of:        
Amortization of past service costs 2 2 6 6
Amortization of net gain (loss) 47 46 136 142
Net periodic benefit cost $ 9 $ 40 $ 25 $ 124