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Significant Accounting Policies - Deferred Income Tax Accounts and Tax Reserves (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Significant Accounting Policies |  |  |  |
Provisional one-time Tax Act tax benefit from remeasurement of deferred tax assets, liabilities and related valuation allowances | $ 7,000,000 | $ 7,020,000 |  |
Net deferred income tax liability | $ 11,961,000 | 11,961,000 | $ 9,278,000 |
Decrease (increase) in income tax expense |  | $ 1,700,000 | $ 729,000 | $ (731,000)

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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