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Earnings Per Share (Anti-dilutive Stock Options Excluded from Computation of Earnings Per Share) (Details) - Stock Options [Member] - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options 239 764 1,493 759
Weighted-average option price $ 76.07 $ 78.73 $ 79.07 $ 78.74