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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017
Tax Credit Carryforward [Line Items] |  |
Foreign operating loss carryforward | $ 4,296 |
Foreign tax credit carryforwards | 38,187 |
Valuation allowance on foreign tax credit | 1,278 |
Valuation allowance on other foreign deferred tax assets | 307 |
Valuation allowance on mirrored deferred tax assets | 1,580 |
Unlimited carryforward | 3,811 |
Net operating losses including unlimited carryforward period | 1,385 |
Deferred tax assets | 3,348 | $ 2,859
Valuation allowance | 44,199 | 13,980
Increased valuation allowance | 30,219 |
Withholding tax on unremitted earnings | 14,608 | $ 12,562
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research credit carryforwards | 846 |
Utah Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research credit carryforwards | 1,022 |
Philippines Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Foreign tax credit carryforwards | 979 |
State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 77 |
Minimum [Member] | Foreign Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2026 |
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] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2019 |
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2030 |
Maximum [Member] | Foreign Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2028 |
Maximum [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2038 |
Maximum [Member] | Utah Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Expiration year for tax credit carryforwards | 2032 |
Maximum [Member] | Philippines Jurisdiction [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 | 2035 |

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