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Stock-based Compensation (Narrative) (Details)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2020
USD ($)
shares / unit
Mar. 30, 2019
USD ($)
Mar. 28, 2020
USD ($)
shares / unit
$ / shares
shares
Mar. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock Issuable per Restricted Stock Unit | shares / unit 1   1  
ESPP maximum contribution percentage 10.00%   10.00%  
ESPP maximum contribution amount by employee     $ 25,000  
ESPP purchase price as a % of stock price 85.00%   85.00%  
Stock-based compensation $ 20,484,000 $ 26,967,000 $ 48,420,000 $ 56,374,000
TSR Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares | shares     97  
Granted (in USD per share) | $ / shares     $ 106.69  
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 1,300,000 $ 1,400,000 $ 2,800,000 $ 2,700,000
Catch-Up Provision | TSR Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, shares | shares     195