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Provision For (Benefit From) Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 01, 2021 | Jan. 03, 2020 | Dec. 28, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |  |
Valuation allowance | $ 67,185 | $ 61,659 |  |
Valuation allowance increase (decrease) | (5,500) | (3,500) |  |
Unrecognized tax benefits | 80,941 | $ 79,078 | $ 76,060 | $ 79,342
Unrecognized tax benefits that would reduce income tax provision and effective tax rate | 50,100 |  |  |
Federal |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforwards | 92,600 |  |  |
Research and development tax credits | 127,400 |  |  |
State and Local Jurisdiction |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforwards | 427,900 |  |  |
State and Local Jurisdiction | Research Tax Credit Carryforward |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Research and development tax credits | 42,900 |  |  |
Tax credit carryforward amount with expiration dates | $ 1,600 |  |  |

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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://www.xbrl.org/2003/role/disclosureRef -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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