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Stockholders' Equity (Employee Stock Benefit Plans) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 65,200    
Options outstanding (in shares) 400 1,300  
Shares available for grant (in shares) 11,000    
Employee Contributions To ESPP 10.00%    
Weighted average grant fair value, grants in period $ 24.49 $ 21.74 $ 68.32
Capitalized stock based compensation $ 10.6 $ 4.7 $ 2.9
Share-based compensation $ 156.6 $ 80.1 $ 107.8
Director Long Term Incentive Plan 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 1,500    
Shares available for grant (in shares) 600    
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 19,400    
Options outstanding (in shares) 400    
Shares available for grant (in shares) 10,400    
Equity incentive plan performance shares maximum vesting period 3 years    
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 11,600    
ESPP shares issued (in shares) 300 300 200
Shares available for grant (in shares) 1,800    
Percent of market price 85.00%    
Share-based compensation $ 6.6 $ 5.8 $ 5.2
Unrecognized Compensation Cost for unvested awards $ 3.1    
Weighted average remaining recognition period (in years) 4 months    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Cost for unvested awards $ 170.7    
Weighted average remaining recognition period (in years) 1 year 7 months 6 days    
Restricted Stock [Member] | Director Long Term Incentive Plan 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted Stock [Member] | Long Term Incentive Plan 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Cost for unvested awards $ 0.3    
Weighted average remaining recognition period (in years) 6 months    
Stock Options [Member] | Director Long Term Incentive Plan 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual life maximum 10 years    
Vesting period 4 years    
Stock Options [Member] | Long Term Incentive Plan 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual life maximum 7 years    
Vesting period 4 years    
Performance Shares [Member] | Long Term Incentive Plan 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years