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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2018 | Dec. 30, 2017 | Dec. 29, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax benefit, remeasurement of deferred tax assets and liabilities |  | $ 45,400 |
Transition tax |  | 100 |
Measurement period adjustment | $ 500 |  |
Charitable contributions carryforward |  | 2,839 | $ 712
Unrecognized tax benefits that would impact effective tax rate |  | $ 2,500 | 2,900
Undistributed earnings of foreign subsidiaries |  |  | 34,500
Income tax on repatriation of foreign earnings |  |  | 20
U.S. state |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  |  | 500
Tax credit carryforward, amount |  |  | $ 2,200
Tax credit carryforward expiration period |  |  | 20 years
Valuation Allowance of Deferred Tax Assets |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowances and reserves decrease |  |  | $ (1,500)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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