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Stockholders' Equity and Stock Compensation Plans - RSU and PSU (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 19,424 $ 17,618 $ 19,582
RSUs      
Stockholder's equity and stock compensation plans      
Vesting period 4 years    
Number of Shares      
Nonvested balance at the beginning of the period (in shares) 470,000 488,000 511,000
Granted (in shares) 167,525 179,478 198,960
Vested (in shares) (178,000) (180,000) (184,000)
Forfeited (in shares) (16,000) (17,000) (38,000)
Nonvested balance at the end of the period (in shares) 443,504 470,000 488,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 50.42 $ 39.56 $ 33.19
Granted (in dollars per share) 83.92 66.26 48.16
Vested (in dollars per share) 46.87 36.95 31.85
Forfeited (in dollars per share) 65.43 48.56 36.39
Nonvested balance at the end of the period (in dollars per share) $ 63.93 $ 50.42 $ 39.56
PSUs      
Stockholder's equity and stock compensation plans      
Vesting period 3 years    
Percentage of shares that ultimately vest depending on growth in diluted earnings per share 50.00%    
Percentage of shares that ultimately vest based on relative total shareholder return over the vesting period 50.00%    
Number of Shares      
Nonvested balance at the beginning of the period (in shares) 384,000 323,000 376,000
Granted (in shares) 74,011 89,816 99,217
Vested (in shares) (162,000) (108,000) (270,000)
Adjustment (in shares) 63,643 79,465 130,730
Forfeited (in shares) (5,000) 0 (13,000)
Nonvested balance at the end of the period (in shares) 355,000 384,000 323,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 53.67 $ 44.27 $ 36.05
Granted (in dollars per share) 99.85 80.41 57.40
Vested (in dollars per share) 47.28 31.63 31.66
Adjustment (in dollars per share) 48.36 31.63 31.66
Forfeited (in dollars per share) 83.98 0 41.80
Nonvested balance at the end of the period (in dollars per share) $ 64.83 $ 53.67 $ 44.27
RSUs and PSUs      
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 17,700 $ 15,400 $ 15,500
Unrecognized compensation cost $ 27,700    
Director | RSUs      
Stockholder's equity and stock compensation plans      
Vesting period 1 year