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Stockholders' Equity and Stock Compensation Plans - RSU and PSU (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 17,618 $ 19,582 $ 13,450
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) 488,000 511,000 499,000
Granted (in shares) 179,478 198,960 226,241
Vested (in shares) (180,000) (184,000) (186,000)
Forfeited (in shares) (17,000) (38,000) (28,000)
Nonvested balance at the end of the period (in shares) 469,568 488,000 511,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 39.56 $ 33.19 $ 27.16
Granted (in dollars per share) 66.26 48.16 41.00
Vested (in dollars per share) 36.95 31.85 26.98
Forfeited (in dollars per share) 48.56 36.39 30.15
Nonvested balance at the end of the period (in dollars per share) $ 50.42 $ 39.56 $ 33.19
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) 323,000 376,000 277,000
Granted (in shares) 89,816 99,217 99,180
Vested (in shares) (108,000) (270,000) 0
Adjustment (in shares) 79,465 130,730  
Forfeited (in shares) 0 (13,000) 0
Nonvested balance at the end of the period (in shares) 384,000 323,000 376,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 44.27 $ 36.05 $ 31.65
Granted (in dollars per share) 80.41 57.40 48.36
Vested (in dollars per share) 31.63 31.66 0
Adjustment (in dollars per share) 31.63 31.66  
Forfeited (in dollars per share) 0 41.80 0
Nonvested balance at the end of the period (in dollars per share) $ 53.67 $ 44.27 $ 36.05
RSUs and PSUs      
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 15,400 $ 15,500 $ 10,600
Unrecognized compensation cost $ 23,100    
Director | RSUs      
Stockholder's equity and stock compensation plans      
Vesting period 1 year