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Share-Based Compensation - Share-Based Compensation Table (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
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 913,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,578,056    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (91,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) 91,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (316,048)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period (9,665)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Net 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (45,359)    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 822,500 913,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,297,984 1,578,056  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 355,350    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 28.28 $ 25.38  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 20.54    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 11.87    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price 19.35    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price 27.92    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price 37.93    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value 12.37 11.58  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 4.31 $ 4.48 $ 4.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value 6.42    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value 4.83    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value 12.08    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value $ 13.55    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 2 months 27 days 4 years 1 month 28 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 3 months 15 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 1.8 $ 1.9  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 0.9    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options $ 6.5    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 4 years 4 months 10 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 3.6 $ 1.8 $ 2.0