Operating (Gains), Losses and Other Charges, Net (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 26, 2013	Jun. 27, 2012	Jun. 26, 2013	Jun. 27, 2012	Dec. 26, 2012
Operating (gains), losses and other charges, net [Abstract]
(Gains) losses on sales of assets and other, net	$ (33,000)	$ (4,908,000)	$ (15,000)	$ (6,863,000)
Restructuring charges and exit costs	660,000	882,000	776,000	2,149,000
Impairment charges	857,000	17,000	857,000	540,000
Operating (gains), losses and other charges, net	1,484,000	(4,009,000)	1,618,000	(4,174,000)
Restructuring charges and exit costs [Abstract]
Exit costs	181,000	327,000	237,000	906,000
Severance and other restructuring charges	479,000	555,000	539,000	1,243,000
Total restructuring charges and exit costs	660,000	882,000	776,000	2,149,000
Components of change in accrued exit cost liabilities [Roll Forward]
Balance at December 26, 2012			4,061,000
Exit costs	181,000	327,000	237,000	906,000
Payments, net of sublease receipts			(771,000)
Interest accretion			135,000
Balance, June 26, 2013	3,662,000		3,662,000
Less current portion included in other current liabilities	1,284,000		1,284,000
Long-term portion included in other noncurrent liabilities	2,378,000		2,378,000
Estimated net cash payments related to exit cost liabilities [Abstract]
Remainder of 2013	839,000		839,000
2014	1,248,000		1,248,000
2015	393,000		393,000
2016	329,000		329,000
2017	331,000		331,000
Thereafter	1,336,000		1,336,000
Total	4,476,000		4,476,000
Less imputed interest	814,000		814,000
Present value of exit cost liabilities	3,662,000		3,662,000
Accrued severance and other restructuring charges	400,000		400,000		500,000
Period of accrued severance and other restructuring charges, maximum			12 months
Impairment charges	$ 857,000	$ 17,000	$ 857,000	$ 540,000

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.