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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 4.1 $ 4.1 $ 13.5 $ 12.7
Performance-based restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares that ultimately vest depending on growth in diluted earnings per share     50.00%  
Percentage of shares that ultimately vest depending on the shareholder return relative to peer group of companies over vesting period     50.00%  
Performance-based restricted stock | Non-employee directors and executive officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     74,011  
Granted, fair value (in dollars per share)     $ 99.85  
Vesting period     3 years  
Restricted stock units | Non-employee directors, executive officers and employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     166,025  
Granted, fair value (in dollars per share)     $ 83.90  
Restricted stock units | Executive officers and employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted stock units | Non-employee director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year