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Employee Stock Benefit Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 111.3    
Total unamortized compensation expense weighted-average recognition period, in years 2 years 7 months 6 days    
Options, Grants in Period 0    
Total intrinsic value of options exercised $ 41.1 $ 36.0 $ 13.9
Weighted average grant-date fair value of stock options granted   $ 6.03 $ 7.36
Fair Value of Stock Options Vested $ 6.5 $ 14.6 $ 18.3
Common Stock, Shares Authorized 360,000,000 360,000,000  
Stock Issued During Period, Shares, Employee Stock Purchase Plans 800,000 1,100,000 1,000,000
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 20.4 $ 19.1 $ 18.1
Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares authorized for grant 74,600,000    
Percentage of fair market value of Common Stock 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 16,100,000    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1] 2,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number [2] 4,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 1,400,000    
Weighted Average Grant-Date Fair Value, Granted $ 40.19 [1] $ 26.13 $ 23.22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 40.4 $ 33.6 $ 16.3
Restricted Stock Units (RSUs) [Member] | Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants Shares Per Unit on Plan Reserve 1.69    
Share units granted vesting period, in years 4 years    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Shares Authorized 39,000,000.0    
Percentage of lower fair market value to be purchased of common stock through payroll deductions 85.00%    
Employee stock options granted term, in months 6 months    
Common Stock, Capital Shares Reserved for Future Issuance 9,000,000    
Employee Stock Purchase Plan [Member] | Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years    
Non Employee Director Stock Options [Member] | Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 1 year    
Market Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000    
Market-based and Performance-based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0    
Market-based and Performance-based Restricted Stock Units [Member] | Two Thousand Two Stock Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 2 years    
Market-based and Performance-based Restricted Stock Units [Member] | Two Thousand Two Stock Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 3 years    
Time Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,300,000    
Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 500,000    
[1] During fiscal year 2017, the Company granted approximately 1.3 million time-based RSUs, 0.5 million performance-based RSUs and 0.2 million market-based RSUs. As of fiscal year end 2017, the Company has 1.7 million market-based and performance-based RSUs outstanding and none had vested as of fiscal 2017 year end.
[2] For those shares expected to vest upon the achievement of specified performance goals, the amount represents of estimated number of shares that expect to vest based on the estimated achievement of such specified performance goals as of the end of fiscal 2017