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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension        
Pension:        
Interest cost $ 97 $ 100 $ 292 $ 300
Expected return on plan assets (76) (77) (231) (231)
Amortization of:        
Amortization of net gain (loss) 36 44 110 132
Net periodic benefit cost from continuing operations 57 119 171 359
Pension | Continuing Operations        
Amortization of:        
Net periodic benefit cost from continuing operations 57 67 171 201
Pension | Discontinued Operations        
Amortization of:        
Net periodic benefit cost from continuing operations   52   158
Post Retirement:        
Pension:        
Service cost 14 10 31 32
Interest cost 9 12 35 35
Amortization of:        
Amortization of net gain (loss) (4) (4) (13) (14)
Net periodic benefit cost from continuing operations 19 18 53 53
U.S. | Pension        
Pension:        
Interest cost 6 7 18 20
Amortization of:        
Amortization of net gain (loss) (1) (1) (3) (1)
Net periodic benefit cost from continuing operations 5 6 15 19
U.S. | Pension | Continuing Operations        
Amortization of:        
Net periodic benefit cost from continuing operations 5 6 15 19
U.S. | Post Retirement:        
Pension:        
Service cost 14 10 31 32
Interest cost 9 12 35 35
Amortization of:        
Amortization of net gain (loss) (4) (4) (13) (14)
Net periodic benefit cost from continuing operations 19 18 53 53
U.K. | Pension        
Pension:        
Interest cost 91 93 274 280
Expected return on plan assets (76) (77) (231) (231)
Amortization of:        
Amortization of net gain (loss) 37 45 113 133
Net periodic benefit cost from continuing operations 52 113 156 340
U.K. | Pension | Continuing Operations        
Amortization of:        
Net periodic benefit cost from continuing operations $ 52 61 $ 156 182
U.K. | Pension | Discontinued Operations        
Amortization of:        
Net periodic benefit cost from continuing operations   $ 52   $ 158