Income Taxes (Details Textual) (USD $)	12 Months Ended
Dec. 25, 2012	Dec. 27, 2011	Dec. 28, 2010	Dec. 29, 2009
Operating Loss Carryforwards [Line Items]
Employment-related tax credits from continuing operations	$ 5,000,000	$ 7,700,000	$ 5,000,000
Liability for uncertain tax positions	4,607,000	9,527,000	9,049,000	9,799,000
Liabilities for interest and penalties	1,400,000
Deferred tax asset related to total state tax exposures	800,000
Net impact of unrecognized tax benefit	1,400,000
US general business credit carryforwards	13,450,000	964,000
State [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 1,200,000

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

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