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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Mar. 29, 2020
Mar. 31, 2019
Stockholders' Equity and Stock Compensation Plans        
Stock-based compensation expense $ 5,000 $ 4,100 $ 9,400 $ 8,600
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)     $ 99.85  
Vesting period     3 years  
Restricted stock units | Non-employee directors, executive officers and employees        
Stockholders' Equity and Stock Compensation Plans        
Granted (in shares)     163,525  
Granted, fair value (in dollars per share)     $ 84.01  
Restricted stock units | Non-employee director        
Stockholders' Equity and Stock Compensation Plans        
Vesting period     1 year  
Restricted stock units | Executive officers and employees        
Stockholders' Equity and Stock Compensation Plans        
Vesting period     4 years