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Share-Based Compensation - Share-Based Compensation Table (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
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 828,665    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,297,984    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (90,500)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) 90,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (147,205)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 15,998    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period (16,498)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (8,960)    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 754,163 828,665  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,215,821 1,297,984  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 306,520    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 29.55 $ 28.28  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 31.37    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 18.52    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price 25.23    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price 54.23    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price 40.58    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value 12.88 12.37  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 6.40 $ 4.31 $ 4.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value 1.50    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value 5.28    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value 20.04    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value $ 15.09    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 9 months 18 days 4 years 2 months 27 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 11 months 1 day    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 14.1 $ 1.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 2.2    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options $ 5.3    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 4 years 9 months 4 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1.9 $ 3.6 $ 1.8