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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Decrease in minimum liability included in other comprehensive income (loss) $ (475) $ (1,252)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 395 350
Expected return on plan assets (312) (268)
Amortization of net (gain)/loss 169 209
Net periodic benefit cost 252 291
Decrease in minimum liability included in other comprehensive income (loss) (469) (1,153)
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 40 38
Interest cost 47 44
Amortization of net (gain)/loss (18) 15
Net periodic benefit cost 69 97
Decrease in minimum liability included in other comprehensive income (loss) (6) (99)
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Decrease in minimum liability included in other comprehensive income (loss) (462) (1,139)
Foreign | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 370 321
Expected return on plan assets (312) (268)
Amortization of net (gain)/loss 170 205
Net periodic benefit cost 228 258
Decrease in minimum liability included in other comprehensive income (loss) (462) (1,139)
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
Decrease in minimum liability included in other comprehensive income (loss) 0 0
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Decrease in minimum liability included in other comprehensive income (loss) (13) (113)
U.S. | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 25 29
Expected return on plan assets 0 0
Amortization of net (gain)/loss (1) 4
Net periodic benefit cost 24 33
Decrease in minimum liability included in other comprehensive income (loss) (7) (14)
U.S. | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 40 38
Interest cost 47 44
Amortization of net (gain)/loss (18) 15
Net periodic benefit cost 69 97
Decrease in minimum liability included in other comprehensive income (loss) $ (6) $ (99)