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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 4.9 $ 4.5
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) 57,542  
Granted, fair value (in dollars per share) $ 144.33  
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) 107,384  
Granted, fair value (in dollars per share) $ 121.00  
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