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Stock-based Compensation Plans (Schedule of Shared-Based Compensation, Performance Units (Details) - $ / shares
 3 Months Ended 12 Months Ended
Feb. 24, 2020
Jan. 28, 2020
Dec. 03, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 7,498 2,763                              
Dividend yield 1.73% 1.76%                              
Risk-free interest rate 1.23% 1.44%                              
Expected life (years) 2 years 7 months 6 days 2 years 8 months 1 day                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                           109,380      
Granted, Weighted average grant date fair value per share $ 18.17 $ 16.76                              
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity                        
Restricted stock unit activity under the 2006 Plan is summarized below.
Restricted stock unitsWeighted
average
grant date fair value per unit		Weighted
average
remaining
contractual
term (years)		Aggregate
intrinsic
value
  (millions)  
Outstanding at September 30, 2017625,830 $11.23 0.9
Granted276,658 12.20 
Vested(342,038)10.84 $4.2 
Cancelled(78,888)11.41 
Outstanding at September 30, 2018481,562 12.14 1.0
Granted233,830 10.10 
Vested(259,107)11.75 2.6 
Cancelled(19,263)11.43 
Outstanding at September 30, 2019437,022 11.31 0.9
Granted301,979 11.55 
Vested(295,241)11.40 3.4 
Cancelled(35,254)11.48 
Outstanding at September 30, 2020408,506 11.41 0.8
        
Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                         61,610   86,516    
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         93,647,000,000 181,065      
Market Based Performance Shares Member                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     147,213                            
Dividend yield     1.87%                            
Risk-free interest rate     1.53%                            
Expected life (years)     2 years 9 months 29 days                            
Granted, Weighted average grant date fair value per share     $ 14.94                            
Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           57,092                      
2016 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                             $ 12.50 $ 13.26  
2016 [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                                 $ 9.38
2016 [Member] | Share-based Payment Arrangement, Tranche One [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                                 102.10%
Settlement of performance-based restricted stock units, net of shares withheld for taxes                           75,375      
2016 [Member] | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 77,823                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                                 (3,998)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                                 73,825
2016 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                               100.00%  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                           73,827      
2016 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 77,824                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                               (3,997)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                               73,827  
2016 [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Performance Shares [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                             135.70%    
Settlement of performance-based restricted stock units, net of shares withheld for taxes                           21,689      
2016 [Member] | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                 77,824                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                             (61,841)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                             15,983    
2017 member [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                           $ 10.53 $ 12.50 $ 13.26  
2017 member [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                               100.00%  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         54,006        
2017 member [Member] | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period               59,285                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                               (5,279)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                               54,006  
2017 member [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                             135.70%    
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         26,294        
2017 member [Member] | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period               59,286                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                             (39,910)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                             19,376    
2017 member [Member] | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                           64.50%      
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         12,501        
2017 member [Member] | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period               59,290                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                           (39,909)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                           19,381      
January 23, 2017 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                               $ 13.15  
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                               100.00%  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         19,012        
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             19,012                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                               0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                               19,012  
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                             135.70%    
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         25,798        
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             19,011                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                           0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                           19,011 19,011    
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                           64.50%      
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         12,263        
January 23, 2017 [Member] | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             19,011                    
November 28, 2017 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                         $ 11.26 $ 10.53 $ 12.50    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         35,425 52,299      
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                             135.70%    
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                             0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                             57,092    
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                           64.50%      
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           57,092                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                           (4,793)      
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                         90.90%        
November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           57,104                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                         (21,679)        
November 27, 2018 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                         $ 11.26 $ 10.53      
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                           102,203      
Performance Factor                           64.50%      
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         110,954                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                           (8,751)      
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         97,772        
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         110,954                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                         (13,182)        
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         84,483        
Performance Factor                         90.90%        
November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         110,967                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                         (26,484)        
December 3, 2019                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value                         $ 11.26        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         60,019        
December 3, 2019 | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         67,241        
December 3, 2019 | Share-based Payment Arrangement, Tranche One [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       69,988                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                         (2,747)        
December 3, 2019 | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         60,019        
December 3, 2019 | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       69,989                          
December 3, 2019 | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Performance Factor                         90.90%        
December 3, 2019 | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       69,989                          
Forecast [Member] | November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                       77,474          
Forecast [Member] | November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                       33,733          
Forecast [Member] | November 28, 2017 [Member] | Share-based Payment Arrangement, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                       32,202          
Forecast [Member] | November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                     65,921            
Forecast [Member] | November 27, 2018 [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                     88,875            
Forecast [Member] | December 3, 2019 | Share-based Payment Arrangement, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Settlement of performance-based restricted stock units, net of shares withheld for taxes                   61,123              
Forecast [Member] | December 3, 2019 | Share-based Payment Arrangement, Tranche Two [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                       (9,970)          
Forecast [Member] | December 3, 2019 | Share-based Payment Arrangement, Tranche Three [Member] | PRSU base units [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period                     (9,970)