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Stock-based Compensation Plans (Schedule of Shared-Based Compensation, Performance Units (Details) - $ / shares
 3 Months Ended 12 Months Ended
Jan. 27, 2021
Dec. 02, 2020
Feb. 24, 2020
Jan. 28, 2020
Dec. 03, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
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      
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, 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 0.9
Granted220,795 12.29 
Vested(228,121)11.62 $2.8 
Cancelled(5,083)11.41 
Outstanding at September 30, 2021396,097 $11.78 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                         62,396   109,380    
Settlement of performance-based restricted stock units, net of shares withheld for taxes                         103,058,000,000 93,647      
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 4,187 234,199 7,498 2,763 147,213                        
Dividend yield 1.84% 1.77% 1.73% 1.76% 1.87%                        
Risk-free interest rate 0.16% 0.21% 1.23% 1.44% 1.53%                        
Expected life (years) 2 years 8 months 1 day 2 years 9 months 29 days 2 years 7 months 6 days 2 years 8 months 1 day 2 years 9 months 29 days                        
Granted, Weighted average grant date fair value per share $ 14.26 $ 15.39 $ 18.17 $ 16.76 $ 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                  
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                         $ 11.86 $ 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                         82,489        
Performance Factor                         116.10% 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                         (28,478)        
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                         $ 11.86 $ 11.26      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                         60,375        
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                         67,597        
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                         (2,391)        
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                         60,375        
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                         116.10% 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] | November 27, 2018 [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                       95,770          
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                     61,446            
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                       (9,614)          
Forecast [Member] | December 3, 2019 | 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                     70,096            
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                     (9,614)