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Stockholders' Equity and Stock Compensation Plans - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Number of Options (in thousands)      
Outstanding at the beginning of the year (in shares) 894,000    
Exercised (in shares) (355,000)    
Forfeited (in shares) 0    
Outstanding at the end of the period (in shares) 539,000 894,000  
Vested or expected to vest at the end of the period (in shares) 539,000    
Exercisable at the end of the period (in shares) 437,000    
Weighted- Average Exercise Price per Share      
Outstanding at the beginning of the year (in dollars per share) $ 33.28    
Exercised (in dollars per share) 28.63    
Forfeited (in dollars per share) 0    
Outstanding at the end of the period (in dollars per share) 36.34 $ 33.28  
Vested or expected to vest at the end of the period (in dollars per share) 36.34    
Exercisable at the end of the period (in dollars per share) $ 34.17    
Weighted- Average Remaining Contractual Term (in years)      
Outstanding at the end of the period 5 years 14 days    
Vested or expected to vest at the end of the period 5 years 14 days    
Exercisable at the end of the period 4 years 7 months 13 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding at the end of the period $ 29,623    
Vested or expected to vest at the end of the period 29,623    
Exercisable at the end of the period $ 24,932    
Assumptions used in the Black-Scholes option-pricing model      
Options granted in the period (in shares) 0 0  
Proceeds from exercise of stock options $ 10,334 $ 11,751 $ 13,520
Stock options      
Assumptions used in the Black-Scholes option-pricing model      
Dividend yield     1.00%
Expected stock price volatility, minimum (as a percent)     36.10%
Expected stock price volatility, maximum (as a percent)     38.80%
Risk-free rate of return, annual, minimum (as a percent)     1.70%
Risk-free rate of return, annual, maximum (as a percent)     2.90%
Unrecognized compensation cost $ 700    
Weighted-average period to recognize the unrecognized compensation cost 1 year    
Weighted-average fair value of stock options granted (in dollars per share)     $ 14.82
Aggregate intrinsic value of options exercised $ 22,400 20,400 $ 14,400
Proceeds from exercise of stock options 10,300 11,800 13,500
Income tax benefit realized from exercises of nonqualified stock options and disqualifying dispositions of qualified options $ 8,300 $ 6,400 $ 5,100