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Employee Stock Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 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 |  | $ 129.1 |  |  |
Total unamortized compensation expense weighted-average recognition period, in years |  | 2 years 9 months 6 days |  |  |
Options, Grants in Period |  | 100,000 |  | 0 |
Total intrinsic value of options exercised |  | $ 30.0 |  | $ 41.1 | $ 36.0
Weighted average grant-date fair value of stock options granted |  | $ 10.62 |  |  | $ 6.03
Fair Value of Stock Options Vested |  | $ 1.9 |  | $ 6.5 | $ 14.6
Common Stock, Shares Authorized |  | 360,000,000.0 |  | 360,000,000.0 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 800,000 |  | 800,000 | 1,100,000
Stock Issued During Period, Value, Employee Stock Purchase Plan |  | $ 24.0 |  | $ 20.4 | $ 19.1
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 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 12,700,000 |  |  |
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] | 2,700,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 2,500,000 |  |  |
Weighted Average Grant-Date Fair Value, Granted |  | $ 37.43 | [1] | $ 40.19 | $ 26.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 73.9 |  | $ 40.4 | $ 33.6
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 |  | 8,200,000 |  |  |
Employee Stock Option [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 |  |  |
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 |  | 500,000 |  |  |
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 |  | 1,500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 700,000 |  |  |
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 |  | 2,000,000 |  |  |
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 |  | 200,000 |  |  |
[1] | During fiscal year 2018, the Company granted approximately 2.0 million time-based RSUs, 0.2 million PRSUs and 0.5 million market-based RSUs. As of fiscal year end 2018, the Company has 1.5 million market-based RSUs and PRSUs outstanding. 0.7 million were vested as of fiscal 2018 year end.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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