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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Stockholders' Equity and Stock Compensation Plans    
Stock-based compensation expense $ 4.5 $ 4.5
Performance-based restricted stock    
Stockholders' Equity and Stock Compensation Plans    
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    
Stockholders' Equity and Stock Compensation Plans    
Granted (in shares) 74,011  
Granted, fair value (in dollars per share) $ 102.13  
Vesting period 3 years  
Restricted stock units | Non-employee directors, executive officers and employees    
Stockholders' Equity and Stock Compensation Plans    
Granted (in shares) 160,775  
Granted, fair value (in dollars per share) $ 83.95  
Restricted stock units | Executive officers and employees    
Stockholders' Equity and Stock Compensation Plans    
Vesting period 4 years  
Restricted stock units | Non-employee director    
Stockholders' Equity and Stock Compensation Plans    
Vesting period 1 year