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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Mar. 27, 2016
Mar. 29, 2015
Stockholders' Equity and Stock Compensation Plans        
Stock-based compensation expense $ 3.4 $ 2.6 $ 6.1 $ 5.4
Options granted (in shares)     241,932  
Exercise price of stock options granted (in dollars per share)     $ 27.16  
Non-employee directors and executive officers        
Restricted stock award        
Weighted-average fair value of stock options granted (in dollars per share)     $ 8.05  
Stock Options | Executive officers        
Restricted stock award        
Vesting period     4 years  
Stock Options | Non-employee director        
Restricted stock award        
Vesting period     1 year  
RSUs | Non-employee director        
Restricted stock award        
Vesting period     1 year  
RSUs | Executive officers and employees        
Restricted stock award        
Vesting period     4 years  
Performance-based restricted stock        
Restricted stock award        
Percentage of shares that ultimately vest depending on fiscal year earnings per share growth rates     50.00%  
Percentage of shares that ultimately vest depending on fiscal year shareholder vesting period     50.00%  
Performance-based restricted stock | Non-employee directors and executive officers        
Restricted stock award        
Granted (in shares)     137,777  
Granted, fair value (in dollars per share)     $ 31.63  
Vesting period     3 years  
Time-based restricted stock | Non-employee directors, executive officers and employees        
Restricted stock award        
Granted (in shares)     215,539  
Granted, fair value (in dollars per share)     $ 27.16