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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension:    
Pension:    
Service cost $ 9 $ 15
Interest cost 162 177
Expected return on plan assets (97) (108)
Amortization of:    
Prior service gain 0 0
Amortization of net gain 44 52
Net periodic benefit cost 118 136
Post Retirement:    
Pension:    
Service cost 7 9
Interest cost 11 11
Amortization of:    
Amortization of net gain (21) (13)
Net periodic benefit cost (3) 7
Foreign | Pension:    
Pension:    
Service cost 9 15
Interest cost 151 164
Expected return on plan assets (97) (108)
Amortization of:    
Prior service gain 0 0
Amortization of net gain 45 53
Net periodic benefit cost 108 124
Foreign | Post Retirement:    
Pension:    
Service cost 0 0
Interest cost 0 0
Amortization of:    
Amortization of net gain 0 0
Net periodic benefit cost 0 0
U.S. | Pension:    
Pension:    
Service cost 0 0
Interest cost 11 13
Expected return on plan assets 0 0
Amortization of:    
Prior service gain 0 0
Amortization of net gain (1) (1)
Net periodic benefit cost 10 12
U.S. | Post Retirement:    
Pension:    
Service cost 7 9
Interest cost 11 11
Amortization of:    
Amortization of net gain (21) (13)
Net periodic benefit cost $ (3) $ 7