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Stock-based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 790,759 578,005 267,298    
Weighted-average recognition period, Compensation expense related to stock awards not yet vested 1 year 6 months        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 7.6        
Number of shares authorized under a Plan         20,500,000
Shares available for future grants under a Plan 5,083,831        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Share-based Compensation, Expected Forfeiture Rate 2.00%        
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 162,969 131,182 118,908    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 203,834 185,808 188,973    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.74 $ 11.51 $ 11.16 $ 11.61  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value $ 10.27        
Share-based compensation liability $ 2.3        
Employee Stock [Member]          
Number of shares authorized under a Plan     5,800,000    
Shares available for future grants under a Plan 2,103,114        
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 240,412,000,000 103,058,000,000      
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 251,981 228,121 295,241    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 223,379 220,795 301,979    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.77 $ 11.78 $ 11.41 $ 11.31  
Minimum [Member] | Performance Shares [Member]          
Performance Factor 0.00%        
Maximum [Member] | Performance Shares [Member]          
Performance Factor 200.00%