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Shareholders' Equity (Details)
1 Months Ended 12 Months Ended
Sep. 22, 2020
$ / shares
Sep. 21, 2020
$ / shares
Sep. 27, 2016
$ / shares
Sep. 30, 2019
$ / shares
Sep. 30, 2018
$ / shares
Sep. 30, 2017
$ / shares
Dec. 31, 2016
$ / shares
Nov. 30, 2020
USD ($)
unit
$ / shares
shares
Nov. 30, 2019
USD ($)
$ / shares
shares
Nov. 30, 2018
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Preferred stock, shares issued (in shares)               0 0      
Preferred stock, shares outstanding (in shares)               0        
Common stock, shares authorized (in shares)               200,000,000 200,000,000      
Common stock, par value (in dollars per share) | $ / shares               $ 0.01 $ 0.01      
Common stock, shares issued (in shares)               44,240,635 45,036,441      
Common stock, shares outstanding (in shares)               44,240,635 45,036,441      
Share repurchase program, authorized amount | $                     $ 250,000,000.0 $ 75,000,000.0
Common stock repurchased and retired (in shares)               1,400,000 700,000 2,900,000    
Common stock repurchased and retired, value (in dollars) | $               $ 60,000,000 $ 25,000,000 $ 120,000,000    
Remaining authorized repurchase amount | $               $ 190,000,000.0        
Cash dividends declared per common share (in dollars per share) | $ / shares $ 0.175 $ 0.165 $ 0.125 $ 0.165 $ 0.155 $ 0.14 $ 0.125 $ 0.670 $ 0.630 $ 0.575 [1]    
Cash dividends, increase (as a percent) 6.00%     6.00% 11.00%              
Dividends paid | $               $ 29,900,000 $ 27,800,000 $ 25,800,000    
Deferred Stock Unit                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Deferred stock units, shares outstanding (in shares)               214,631        
Deferred stock unit of common stock (in shares) | unit               1        
[1] (1)The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.