Operating (Gains), Losses and Other Charges, Net (Details) (USD $)	3 Months Ended
	Mar. 26, 2014		Mar. 27, 2013	Dec. 25, 2013
Operating (gains), losses and other charges, net [Abstract]
(Gains) losses on sales of assets and other, net	$ (8,000)		$ 18,000
Restructuring charges and exit costs	430,000		116,000
Impairment charges	0		0
Operating (gains), losses and other charges, net	422,000		134,000
Restructuring charges and exit costs [Abstract]
Exit costs	54,000	[1]	56,000
Severance and other restructuring charges	376,000		60,000
Total restructuring charges and exit costs	430,000		116,000
Components of change in accrued exit cost liabilities [Roll Forward]
Balance at December 25, 2013	3,149,000
Exit costs	54,000	[1]	56,000
Payments, net of sublease receipts	(355,000)
Interest accretion	52,000
Balance, March 26, 2014	2,900,000
Less current portion included in other current liabilities	1,182,000
Long-term portion included in other noncurrent liabilities	1,718,000
Estimated net cash payments related to exit cost liabilities [Abstract]
Remainder of 2014	1,082,000
2015	566,000
2016	295,000
2017	296,000
2018	299,000
Thereafter	986,000
Total	3,524,000
Less imputed interest	624,000
Present value of exit cost liabilities	2,900,000
Accrued severance and other restructuring charges	$ 200,000			$ 100,000
Period of accrued severance and other restructuring charges, maximum	12 months

[1] Included as a component of operating (gains), losses and other charges, net.