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Significant Accounting Policies - Deferred Income Tax Accounts and Tax Reserves (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Significant Accounting Policies |  |  |  |
Provisional Tax Act tax benefit from remeasurement of deferred tax assets, liabilities and related valuation allowances | $ 7,000,000.0 |  |  | $ 7,020,000
Net deferred income tax liability |  | $ 800,000 |  |
Decrease in income tax expense |  | $ 400,000 | $ 0 | $ 1,700,000

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- Definition Net amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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