Income Taxes Effective Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 28, 2014	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax provision (benefit)		$ (9,223)	$ (8,371)	$ (10,118)
State income taxes (benefit), net of federal provision (benefit)		(749)	(656)	(688)
Stock-based compensation expense		0	0	(657)
Change in valuation allowance		24,326	624	2,063
Valuation Allowances and Reserves, Charged to Cost and Expense	24,326	24,326	624	2,063
Employment tax credits		(2,291)	(2,298)	(353)
Miscellaneous		(298)	304	(340)
Provision (benefit) for income taxes		$ 11,765us-gaap_IncomeTaxExpenseBenefit	$ (10,397)us-gaap_IncomeTaxExpenseBenefit	$ (10,093)us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

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