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Stockholders' Equity and Stock Compensation Plans - ESPP (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Stockholder's equity and stock compensation plans      
Cash received from exercise of purchase rights $ 10,334 $ 11,751 $ 13,520
Assumptions used in the Black-Scholes option-pricing model      
Stock-based compensation expense $ 19,424 $ 17,618 $ 19,582
ESPP      
Stockholder's equity and stock compensation plans      
Shares purchased (in shares) 168 148 141
Weighted-average purchase price per share (in dollars per share) $ 51.77 $ 46.38 $ 40.38
Cash received from exercise of purchase rights $ 8,715 $ 6,844 $ 5,727
Assumptions used in the Black-Scholes option-pricing model      
Dividend yield 1.00% 1.00% 1.00%
Expected stock price volatility 26.50% 26.70% 24.00%
Risk-free rate of return, annual 1.60% 2.60% 1.80%
Expected life (in years) 1 year 1 year 1 year
Stock-based compensation expense $ 1,200 $ 900 $ 600
Unrecognized compensation cost 300 $ 200  
Accumulated amount by participants to purchase the entity's common stock $ 8,500