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Commitments and Contingencies Development Project (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]        
Purchases of property, plant and equipment $ 610 $ 462 $ 178  
Tempress Systems and Energy Research Centre Agreement        
Schedule of Equity Method Investments [Line Items]        
Purchases of property, plant and equipment   $ 1,400    
Ownership rights, results of projects developed separately by individual parties   100.00%    
Research and development agreement term   4 years    
Research and development, required contribution, labor and assets       $ 1,400