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Stock-based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 24, 2020
Jan. 28, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Dec. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     267,298 106,896 214,435    
Weighted-average recognition period, Compensation expense related to stock awards not yet vested     1 year 5 months 26 days        
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     6,575,797        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years        
Share-based Compensation, Expected Forfeiture Rate     2.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 7,498 2,763          
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     118,908 132,289 170,675    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     188,973 180,747 163,199    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 11.16 $ 11.39 $ 12.12 $ 11.36  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value     $ 10.39        
Share-based compensation liability     $ 2.2        
Employee Stock [Member]              
Number of shares authorized under a Plan         5,800,000    
Shares available for future grants under a Plan     2,400,158        
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     93,647,000,000 181,065      
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     295,241 259,107 342,038    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     301,979 233,830 276,658    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 11.41 $ 11.31 $ 12.14 $ 11.23  
Minimum [Member] | Performance Shares [Member]              
Performance Factor     0.00%        
Maximum [Member] | Performance Shares [Member]              
Performance Factor     200.00%