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Share-Based Compensation - Share-Based Compensation Table (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 754,163    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,215,821    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (110,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) 110,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (155,588)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 8,331    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period (106,996)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (181,834)    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 652,494 754,163  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 881,403 1,215,821  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 222,116    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 27.31 $ 29.55  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 38.77    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 22.54    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price 26.15    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price 54.02    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price 24.42    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value 11.55 12.88  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 8.67 $ 6.40 $ 4.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value 9.05    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value 13.20    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value 19.93    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value $ 10.43    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 6 months 26 days 3 years 9 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 6 months 7 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 9.8 $ 14.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 3.1    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options $ 3.9    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 3 years 11 months 1 day    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 2.6 $ 1.9 $ 3.6