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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) $ (1,944) $ 3,413
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 41 35
Interest cost 415 614
Expected return on plan assets (268) (357)
Amortization of net (gain)/loss 374 169
Net periodic benefit cost 562 461
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,845) 3,130
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 38 27
Interest cost 44 42
Amortization of net (gain)/loss 15 (79)
Net periodic benefit cost 97 (10)
Increase (decrease) in minimum liability included in other comprehensive income (loss) (99) 283
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,831) 3,105
Foreign | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 41 35
Interest cost 386 571
Expected return on plan assets (268) (357)
Amortization of net (gain)/loss 370 174
Net periodic benefit cost 529 423
Increase (decrease) in minimum liability included in other comprehensive income (loss) (1,831) 3,105
Foreign | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 0 0
Amortization of net (gain)/loss 0 0
Net periodic benefit cost 0 0
Increase (decrease) in minimum liability included in other comprehensive income (loss) 0 0
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) (113) 308
U.S. | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 29 43
Expected return on plan assets 0 0
Amortization of net (gain)/loss 4 (5)
Net periodic benefit cost 33 38
Increase (decrease) in minimum liability included in other comprehensive income (loss) (14) 25
U.S. | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 38 27
Interest cost 44 42
Amortization of net (gain)/loss 15 (79)
Net periodic benefit cost 97 (10)
Increase (decrease) in minimum liability included in other comprehensive income (loss) $ (99) $ 283