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Earnings Per Share (Anti-dilutive Stock Options Excluded from Computation of Earnings Per Share) (Details) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share        
Options 731 698 734 701
Weighted-average option price $ 46.55 $ 46.55 $ 46.55 $ 46.54