Operating (Gains), Losses and Other Charges, Net (Details) (USD $)	3 Months Ended
Mar. 27, 2013	Mar. 28, 2012	Dec. 26, 2012
Operating (gains), losses and other charges, net [Abstract]
(Gains) losses on sales of assets and other, net	$ 18,000	$ (1,955,000)
Restructuring charges and exit costs	116,000	1,267,000
Impairment charges	0	523,000
Operating (gains), losses and other charges, net	134,000	(165,000)
Restructuring charges and exit costs [Abstract]
Exit costs	56,000	579,000
Severance and other restructuring charges	60,000	688,000
Total restructuring charges and exit costs	116,000	1,267,000
Components of change in accrued exit cost liabilities [Roll Forward]
Balance at December 26, 2012	4,061,000
Exit costs	56,000	579,000
Payments, net of sublease receipts	(447,000)
Interest accretion	70,000
Balance, March 27, 2013	3,740,000
Less current portion included in other current liabilities	1,269,000
Long-term portion included in other noncurrent liabilities	2,471,000
Estimated net cash payments related to exit cost liabilities [Abstract]
Remainder of 2013	1,171,000
2014	1,077,000
2015	379,000
2016	321,000
2017	323,000
Thereafter	1,328,000
Total	4,599,000
Less imputed interest	859,000
Present value of exit cost liabilities	3,740,000
Accrued severance and other restructuring charges	$ 300,000		$ 500,000
Period of accrued severance and other restructuring charges, maximum	12 months

Carrying amount as of the balance sheet date of known and estimated costs associated with termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from, or disposal of, business activities or restructurings and costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits. These costs are expected to be paid in the next twelve months.

No definition available.