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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Pension:
        
Pension:        
Service cost $ 12 $ 15 $ 23 $ 30
Interest cost 210 189 417 378
Expected return on plan assets (117) (104) (232) (208)
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain 21 42 42 84
Net periodic benefit cost 126 142 250 284
Post Retirement:
        
Pension:        
Service cost 2 0 5 0
Interest cost 11 9 22 18
Amortization of:        
Amortization of net gain (36) (46) (72) (92)
Net periodic benefit cost (23) (37) (45) (74)
Foreign | Pension:
        
Pension:        
Service cost 12 15 23 30
Interest cost 193 173 383 346
Expected return on plan assets (117) (104) (232) (208)
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain 23 36 46 72
Net periodic benefit cost 111 120 220 240
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 17 16 34 32
Expected return on plan assets 0 0 0 0
Amortization of:        
Prior service gain 0 0 0 0
Amortization of net gain (2) 6 (4) 12
Net periodic benefit cost 15 22 30 44
U.S. | Post Retirement:
        
Pension:        
Service cost 2 0 5 0
Interest cost 11 9 22 18
Amortization of:        
Amortization of net gain (36) (46) (72) (92)
Net periodic benefit cost $ (23) $ (37) $ (45) $ (74)