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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018
Tax Credit Carryforward [Line Items] |  |
Foreign operating loss carryforward | $ 4,896 |
Valuation allowance on foreign tax credit | 1,466 |
Valuation allowance on other foreign deferred tax assets | 259 |
Valuation allowance on mirrored deferred tax assets | 1,863 |
Unlimited carryforward | 4,831 |
Net operating losses including unlimited carryforward period | 1,466 |
Valuation allowance | 64,285 | $ 44,199
Increased valuation allowance | 20,086 |
Withholding tax on unremitted earnings | 12,914 | $ 14,608
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research credit carryforwards | 1,041 |
Utah Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research credit carryforwards | 1,135 |
Philippines Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Foreign tax credit carryforwards | 772 |
State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 85 |
Minimum [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2036 |
Minimum [Member] | Utah Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2027 |
Minimum [Member] | Philippines Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2020 |
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2030 |
Maximum [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2039 |
Maximum [Member] | Utah Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2033 |
Maximum [Member] | Philippines Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2021 |
Maximum [Member] | State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2038 |

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