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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets | $ 244,111 | $ 0 |  |
Valuation allowance | 58,112 | 418,958 |  |
Valuation allowance increase (decrease) | (360,800) | (210,100) |  |
Income Tax Examination [Line Items] |  |  |  |
Unrecognized tax benefits | 76,060 | 79,342 | $ 61,809 | $ 88,638
Unrecognized tax benefits that would reduce income tax provision and effective tax rate | $ 46,000 |  |  |
Federal [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforwards |  | 614,000 |  |
Research and development tax credits |  | 102,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforwards |  | 453,000 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Research and development tax credits |  | $ 34,000 |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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