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Share-Based Compensation (Summary of Stock Option Activity) (Details)
shares in Thousands
12 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Outstanding, beginning (shares) | shares 3,202
Exercised (shares) | shares (1,015)
Forfeited (shares) | shares (1)
Outstanding, ending (shares) | shares 2,186
Exercisable (shares) | shares 2,186
Weighted Average Exercise Price  
Outstanding, beginning (in dollars per share) | $ / shares $ 84.85
Exercised (in dollars per share) | $ / shares 75.15
Forfeited (in dollars per share) | $ / shares 124.76
Outstanding, ending (in dollars per share) | $ / shares 89.33
Exercisable (in dollars per share) | $ / shares $ 89.33