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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension:        
Pension:        
Service cost $ 9 $ 13 $ 27 $ 42
Interest cost 157 170 474 515
Expected return on plan assets (92) (105) (281) (317)
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain 43 48 131 149
Net periodic benefit cost 117 126 351 389
Post Retirement:        
Pension:        
Service cost 7 9 20 26
Interest cost 11 11 32 33
Amortization of:        
Amortization of net gain (21) (13) (60) (38)
Net periodic benefit cost (3) 7 (8) 21
Foreign | Pension:        
Pension:        
Service cost 9 13 27 42
Interest cost 146 157 442 476
Expected return on plan assets (92) (105) (281) (317)
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain 44 49 134 151
Net periodic benefit cost 107 114 322 352
Foreign | Post Retirement:        
Pension:        
Service cost 0 0 0 0
Interest cost 0 0 0 0
Amortization of:        
Amortization of net gain 0 0 0 0
Net periodic benefit cost 0 0 0 0
U.S. | Pension:        
Pension:        
Service cost 0 0 0 0
Interest cost 11 13 32 39
Expected return on plan assets 0 0 0 0
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain (1) (1) (3) (2)
Net periodic benefit cost 10 12 29 37
U.S. | Post Retirement:        
Pension:        
Service cost 7 9 20 26
Interest cost 11 11 32 33
Amortization of:        
Amortization of net gain (21) (13) (60) (38)
Net periodic benefit cost $ (3) $ 7 $ (8) $ 21