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Contract Services and Advanced Technology Costs (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Contract revenue current work $ 16.2    
Contract revenue past work $ 8.1    
2017 ORNL Contract [Member] | Scenario, Forecast [Member]      
Contract value   $ 25.0  
Contract monthly revenue   2.0  
Contract milestone payments   $ 1.0  
2016 ORNL Contract [Member]      
Contract monthly revenue     $ 2.7