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Stockholders' Equity (Employee Stock Benefit Plans) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Oct. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 100.7    
Options outstanding (in shares) 4.8 5.4  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 19.1    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 26.30 $ 23.26 $ 11.91
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value $ 21.9 $ 16.6 $ 21.8
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 3.7 2.3 1.7
Share-based Compensation $ 78.0 $ 99.8 $ 86.0
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 27.1    
Options outstanding (in shares) 4.8    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 18.4    
Employee Incentive Plans Options Contractual Life Maximum 7 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Maximum 4 years    
Equity Incentive Restricted Stock Awards Vesting Period Maximum 4 years    
Equity Incentive Plan Performance Based Share Awards Vesting Period Maximum 3 years    
Director Long Term Incentive Plan 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1.5    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0.7    
Employee Incentive Plans Options Contractual Life Maximum 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Maximum 4 years    
Equity Incentive Restricted Stock Awards Vesting Period Maximum 1 year    
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 9.7    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0.3 0.3 0.5
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1.0    
Share Based Compensation Arrangement By Share Based Payment Award Percent Of Market Price 85.00%    
Share-based Compensation $ 4.6 $ 4.7 $ 4.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1.5    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 months 30 days    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 63.2    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year