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Acquisition (Details) - USD ($)
$ in Thousands
Jan. 07, 2015
Sep. 30, 2017
Sep. 30, 2016
Purchase Price Allocation      
Goodwill   $ 4,789 $ 4,789
Leveltek Processing, LLC      
Acquisition      
Acquisition price $ 14,600    
Purchase Price Allocation      
Property, plant and equipment, net 7,563    
Inventory 148    
Total identifiable net assets 9,811    
Goodwill 4,789    
Total purchase price 14,600    
Customer relationships | Leveltek Processing, LLC      
Purchase Price Allocation      
Customer relationships $ 2,100