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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 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share        
Options 764 780 760 66
Weighted-average option price $ 78.70 $ 62.64 $ 78.73 $ 62.98