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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) $ 3,413 $ 68
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) 308 (95)
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in minimum liability included in other comprehensive income (loss) 3,105 163
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 35 56
Interest cost 614 686
Expected return on plan assets (357) (423)
Prior service gains 0 0
Amortization of net (gain)/loss 169 190
Net periodic benefit cost 461 509
Increase (decrease) in minimum liability included in other comprehensive income (loss) 3,130 157
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 43 52
Expected return on plan assets 0 0
Prior service gains 0 0
Amortization of net (gain)/loss (5) (3)
Net periodic benefit cost 38 49
Increase (decrease) in minimum liability included in other comprehensive income (loss) 25 (6)
Pension | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 35 56
Interest cost 571 634
Expected return on plan assets (357) (423)
Prior service gains 0 0
Amortization of net (gain)/loss 174 193
Net periodic benefit cost 423 460
Increase (decrease) in minimum liability included in other comprehensive income (loss) 3,105 163
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 27 34
Interest cost 42 44
Expected return on plan assets 0 0
Prior service gains 0 0
Amortization of net (gain)/loss (79) (50)
Net periodic benefit cost (10) 28
Increase (decrease) in minimum liability included in other comprehensive income (loss) 283 (89)
Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 27 34
Interest cost 42 44
Expected return on plan assets 0 0
Prior service gains 0 0
Amortization of net (gain)/loss (79) (50)
Net periodic benefit cost (10) 28
Increase (decrease) in minimum liability included in other comprehensive income (loss) 283 (89)
Post Retirement | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 0 0
Expected return on plan assets 0 0
Prior service gains 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