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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension        
Pension:        
Interest cost $ 67 $ 97 $ 207 $ 292
Expected return on plan assets (72) (76) (220) (231)
Amortization of:        
Amortization of past service costs 2   6  
Amortization of net gain (loss) 46 36 144 110
Net periodic benefit cost 43 57 137 171
Post Retirement        
Pension:        
Service cost 10 14 29 31
Interest cost 12 9 35 35
Amortization of:        
Amortization of net gain (loss) 4 (4) 16 (13)
Net periodic benefit cost 26 19 80 53
U.S. | Pension        
Pension:        
Interest cost 3 6 11 18
Amortization of:        
Amortization of net gain (loss)   (1) 2 (3)
Net periodic benefit cost 3 5 13 15
U.S. | Post Retirement        
Pension:        
Service cost 10 14 29 31
Interest cost 12 9 35 35
Amortization of:        
Amortization of net gain (loss) 4 (4) 16 (13)
Net periodic benefit cost 26 19 80 53
U.K. | Pension        
Pension:        
Interest cost 64 91 196 274
Expected return on plan assets (72) (76) (220) (231)
Amortization of:        
Amortization of past service costs 2   6  
Amortization of net gain (loss) 46 37 142 113
Net periodic benefit cost $ 40 $ 52 $ 124 $ 156