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Earnings Per Share and Certain Related Information (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 04, 2017
Mar. 31, 2017
Mar. 31, 2017
Mar. 17, 2017
Jul. 23, 2015
Earnings Per Share Basic [Line Items]          
Earnings available to participating securities   $ 600,000 $ 1,400,000    
Amount authorized to be repurchased         $ 500,000,000
Quarterly dividend per share       $ 0.15  
Subsequent Event          
Earnings Per Share Basic [Line Items]          
Quarterly dividend per share $ 0.15        
Dividends date declared May 04, 2017        
Dividends payment date Jun. 16, 2017        
Dividends record date May 19, 2017