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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2019 | Dec. 30, 2017 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax benefit, remeasurement of deferred tax assets and liabilities |  | $ 45,400 |  |  |
Transition tax |  | $ 100 |  |  |
Adjustment for completion of 2018 return |  |  | $ 156 | $ 1,326 | $ (450)
Unrecognized tax benefits that would impact effective tax rate |  |  | 2,600 | $ 2,900 |
Undistributed earnings of foreign subsidiaries |  |  | 37,000 |  |
Income tax on repatriation of foreign earnings |  |  | 20 |  |
Federal Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Adjustment for completion of 2018 return | $ (300) |  |  |  |
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 200 |  |
Tax credit carryforward, amount |  |  | $ 1,300 |  |
Tax credit carryforward expiration period |  |  | 20 years |  |
Valuation Allowance of Deferred Tax Assets |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Valuation allowances and reserves decrease |  |  | $ 3,100 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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