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Stock-Based Compensation - Stock Based Compensation Table (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,779,983    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (86,500)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) 86,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (152,917)    
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 (89,815)    
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 (32,647)    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 913,500   1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,591,104   1,779,983
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 664,957    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 25.40   $ 24.76
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 19.24    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 9.05    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 25.47    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 50.64    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 26.62    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value $ 11.59   $ 11.44
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4.48    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value $ 4.29    
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 $ 14.27    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value $ 10.78    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 4 months 21 days   4 years 10 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 4 months 10 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 2.9   $ 4.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 2.7    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options 8.2    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 5 years 5 months 19 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1.8 $ 1.8