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Selected Balance Sheet Data (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Accounts receivable, net:      
Accounts receivable $ 28,943 $ 27,142  
Less allowance for doubtful accounts 367 313  
Total accounts receivable, net 28,576 26,829  
Inventories:      
Raw materials 26,402 21,171  
Work in process 315 224  
Finished goods 4,530 4,745  
Total Inventories 31,247 26,140  
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 35,424 45,951  
Less accumulated depreciation and amortization 22,193 32,041  
Total property, equipment and improvements, net 13,231 13,910 15,157
Land
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 1,800 1,800  
Buildings
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 10,522 10,522  
Improvements
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 3,420 3,863  
Equipment
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 13,646 14,989  
Purchased Software
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross 3,559 12,296  
Furniture and Fixtures
      
Property, Plant and Equipment, Net      
Total property, equipment and improvements, gross $ 2,477 $ 2,481