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Stock-based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Dec. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 214,435 238,826 867,065    
Weighted-average recognition period, Compensation expense related to stock awards not yet vested 1 year 4 months 13 days        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5.1        
Number of shares authorized under a Plan         20,500,000
Shares available for future grants under a Plan 7,410,033        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Compensation, Expected Forfeiture Rate 2.00%        
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Settlement of performance-based restricted stock units, net of shares withheld for taxes 170,675 278,000 270,822    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 163,199 199,260 302,875    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.12 $ 11.36 $ 9.60 $ 6.22  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value $ 11.51        
Share-based compensation liability $ 3.0        
Employee Stock [Member]          
Number of shares authorized under a Plan   5,800,000      
Shares available for future grants under a Plan   2,750,935      
Price for shares offered under ESPP, as a percentage of closing price on the first or last day of the offering period 85.00%        
Performance Shares [Member]          
Settlement of performance-based restricted stock units, net of shares withheld for taxes 146,061 263,410      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Settlement of performance-based restricted stock units, net of shares withheld for taxes 342,038 359,797 510,535    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 276,658 343,860 360,255    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.14 $ 11.23 $ 9.34 $ 8.45  
Minimum [Member] | Performance Shares [Member]          
Performance Factor 0        
Maximum [Member] | Performance Shares [Member]          
Performance Factor 2