Income Taxes Components of Deferred Tax Assets and Liabilities, Narrative (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 4,317	$ 3,748
Deferred Tax Assets, Net	3,346us-gaap_DeferredTaxAssetsLiabilitiesNet	2,550us-gaap_DeferredTaxAssetsLiabilitiesNet
Federal net operating losses	3,503	0
State net operating losses	3,417	2,936
Federal tax credit carryforwards	2,472	0
State tax credit carryforwards	1,740	1,740
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards and Tax Credit Carryforwards, Maximum Years Until Expiration	20
Operating Loss Carryforwards	10,010
State Taxing Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards and Tax Credit Carryforwards, Maximum Years Until Expiration	10
Operating Loss Carryforwards	$ 77,405

Maximum number of years until expiration of operating loss carryforwards and tax credit carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax credit carryforwards not separately disclosed.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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