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Rocky Flats Settlement (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Loss Contingencies [Line Items]    
Settlement liability, Current $ 242,500 $ 0
Rocky Flats [Member]    
Loss Contingencies [Line Items]    
Settlement amount, in aggregate 375,000  
Settlement amount, total Rockwell obligation 243,750  
Settlement amount receivable from U.S. Department of Energy $ 243,750