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Stockholders' Equity and Stock Compensation Plans - RSU and PSU (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Oct. 02, 2016
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 19,582 $ 13,450 $ 12,964
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) 511,000 499,000 483,000
Granted (in shares) 198,960 226,241 216,539
Vested (in shares) (184,000) (186,000) (180,000)
Forfeited (in shares) (38,000) (28,000) (21,000)
Nonvested balance at the end of the period (in shares) 488,139 511,000 499,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 33.19 $ 27.16 $ 26.75
Granted (in dollars per share) 48.16 41.00 27.14
Vested (in dollars per share) 31.85 26.98 26.03
Forfeited (in dollars per share) 36.39 30.15 27.11
Nonvested balance at the end of the period (in dollars per share) $ 39.56 $ 33.19 $ 27.16
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) 376,000 277,000 139,000
Granted (in shares) 99,217 99,180 137,777
Vested (in shares) (139,000) 0 0
Forfeited (in shares) (13,000) 0 0
Nonvested balance at the end of the period (in shares) 323,000 376,000 277,000
Weighted-Average Grant Date Fair Value      
Nonvested balance at the beginning of the period (in dollars per share) $ 36.05 $ 31.65 $ 31.66
Granted (in dollars per share) 57.40 48.36 31.63
Vested (in dollars per share) 31.66 0.00 0.00
Forfeited (in dollars per share) 41.80 0.00 0.00
Nonvested balance at the end of the period (in dollars per share) $ 44.27 $ 36.05 $ 31.65
RSUs and PSUs      
Weighted-Average Grant Date Fair Value      
Stock-based compensation expense $ 15,500 $ 10,600 $ 10,300
Unrecognized compensation cost $ 18,100    
Director | RSUs      
Stockholder's equity and stock compensation plans      
Vesting period 1 year