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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Income Tax Examination [Line Items] |  |  |
Tax Cuts and Jobs Act of 2017, reduction in deferred tax asset | $ 184.8 |  |
Tax Cuts and Jobs Act of 2017, change in valuation allowance | 184.8 |  |
Valuation allowance increase (decrease) | (210.1) | $ 92.7 | $ 7.9
Federal [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Net operating loss carryforwards | 1,105.0 |  |
Research and development tax credits | 83.0 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Net operating loss carryforwards | 424.0 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Research and development tax credits | $ 28.0 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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