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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]        
Reversal of AMT credits $ 1,800      
Change in tax rate, deferred tax asset, provisional income tax expense 29,400      
Tax credits 3,569 $ 4,399    
Unrecognized tax benefits 3,096 5,253 $ 6,184 $ 6,756
Unrecognized tax benefits that would impact effective tax rate   $ 1,600    
Federal Tax Authority        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards 39,700      
Tax credits 3,000      
State Tax Jurisdiction        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards 60,000      
Tax credits $ 4,200