Operating (Gains), Losses and Other Charges, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 25, 2014	Jun. 26, 2013	Jun. 25, 2014		Jun. 26, 2013	Dec. 25, 2013
Operating (gains), losses and other charges, net [Abstract]
(Gains) losses on sales of assets and other, net	$ (33)	$ (33)	$ (41)		$ (15)
Restructuring charges and exit costs	45	660	475		776
Impairment charges	28	857	28		857
Operating (gains), losses and other charges, net	40	1,484	462		1,618
Restructuring charges and exit costs [Abstract]
Exit costs	35	181	89	[1]	237
Severance and other restructuring charges	10	479	386		539
Total restructuring charges and exit costs	45	660	475		776
Components of change in accrued exit cost liabilities [Roll Forward]
Balance, December 25, 2013			3,149
Exit costs	35	181	89	[1]	237
Payments, net of sublease receipts			(574)
Reclassification of certain lease assets and liabilities, net			(10)
Interest accretion			99
Balance, June 25, 2014	2,753		2,753
Less current portion included in other current liabilities	1,082		1,082
Long-term portion included in other noncurrent liabilities	1,671		1,671
Estimated net cash payments related to exit cost liabilities [Abstract]
Remainder of 2014	873		873
2015	583		583
2016	295		295
2017	296		296
2018	299		299
Thereafter	986		986
Total	3,332		3,332
Less imputed interest	579		579
Present value of exit cost liabilities	2,753		2,753
Accrued severance and other restructuring charges	$ 100		$ 100			$ 100
Period of accrued severance and other restructuring charges, maximum			12 months

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