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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Pension:        
Pension:        
Interest cost $ 98 $ 103 $ 195 $ 200
Expected return on plan assets (78) (79) (155) (154)
Amortization of:        
Amortization of net gain (loss) (37) (45) 74 88
Net periodic benefit cost from continuing operations 57 122 114 240
Post Retirement:        
Pension:        
Service cost 9 10 17 21
Interest cost 13 12 26 24
Amortization of:        
Amortization of net gain (loss) (5) (4) (9) (10)
Net periodic benefit cost from continuing operations 17 18 34 35
U.K. | Pension:        
Pension:        
Interest cost 92 96 183 187
Expected return on plan assets (78) (79) (155) (154)
Amortization of:        
Amortization of net gain (loss) (38) (46) 76 89
Net periodic benefit cost from continuing operations 52 116 104 228
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 from continuing operations 0 0 0 0
U.S. | Pension:        
Pension:        
Interest cost 6 7 12 13
Expected return on plan assets 0 0 0 0
Amortization of:        
Amortization of net gain (loss) 1 1 (2) (1)
Net periodic benefit cost from continuing operations 5 6 10 12
U.S. | Post Retirement:        
Pension:        
Service cost 9 10 17 21
Interest cost 13 12 26 24
Amortization of:        
Amortization of net gain (loss) (5) (4) (9) (10)
Net periodic benefit cost from continuing operations 17 18 34 35
Continuing Operations | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations 57 69 114 134
Continuing Operations | U.K. | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations 52 63 104 122
Continuing Operations | U.S. | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations 5 6 10 12
Discontinued Operations | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations 0 53 0 106
Discontinued Operations | U.K. | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations 0 53 0 106
Discontinued Operations | U.S. | Pension:        
Amortization of:        
Net periodic benefit cost from continuing operations $ 0 $ 0 $ 0 $ 0