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Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2007
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Research and Technical Costs        
Research and technical costs related to the development of new products and processes   $ 3,285 $ 3,259 $ 2,828
Pension and Postretirement Benefits        
Maximum liability related to total retiree health care costs under plan amendment $ 5,000      
Building and improvements
       
Property, Plant and Equipment        
Estimated economic useful lives   40 years    
Machinery and equipment | Minimum
       
Property, Plant and Equipment        
Estimated economic useful lives   5 years    
Machinery and equipment | Maximum
       
Property, Plant and Equipment        
Estimated economic useful lives   14 years    
Office equipment and computer software | Minimum
       
Property, Plant and Equipment        
Estimated economic useful lives   3 years    
Office equipment and computer software | Maximum
       
Property, Plant and Equipment        
Estimated economic useful lives   10 years    
Land improvements
       
Property, Plant and Equipment        
Estimated economic useful lives   20 years