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Stock-based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Dec. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 106,896 214,435 238,826    
Weighted-average recognition period, Compensation expense related to stock awards not yet vested 1 year 5 months 19 days        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 5.7        
Number of shares authorized under a Plan         20,500,000
Shares available for future grants under a Plan 7,022,737        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Compensation, Expected Forfeiture Rate 2.00%        
Share-based Payment Arrangement, 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 132,289 170,675 278,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 180,747 163,199 199,260    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 11.39 $ 12.12 $ 11.36 $ 9.60  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value $ 11.24        
Share-based compensation liability $ 1.8        
Employee Stock [Member]          
Number of shares authorized under a Plan     5,800,000    
Shares available for future grants under a Plan 2,583,129        
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 332,875 146,061      
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 259,107 342,038 359,797    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 233,830 276,658 343,860    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 11.31 $ 12.14 $ 11.23 $ 9.34  
Minimum [Member] | Performance Shares [Member]          
Performance Factor 0        
Maximum [Member] | Performance Shares [Member]          
Performance Factor 2