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Operating (Gains), Losses and Other Charges, Net (Details) (USD $) | 12 Months Ended
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Dec. 26, 2012 | Dec. 28, 2011 | Dec. 29, 2010
Operating (gains), losses and other charges, net [Abstract] |  |  |  |  |
Gains on sales of assets and other, net | $ (7,090,000) |  | $ (3,187,000) |  | $ (9,481,000)
Restructuring charges and exit costs | 3,912,000 |  | 1,234,000 |  | 4,162,000
Impairment charges | 3,660,000 |  | 4,055,000 |  | 375,000
Operating (gains), losses and other charges, net | 482,000 |  | 2,102,000 |  | (4,944,000)
Restructuring charges and exit costs [Abstract] |  |  |  |  |
Exit costs | 1,926,000 | [1] | 848,000 | [1] | 1,247,000
Severance and other restructuring charges | 1,986,000 |  | 386,000 |  | 2,915,000
Total restructuring charges and exit costs | 3,912,000 |  | 1,234,000 |  | 4,162,000
Components of change in accrued exit cost liabilities [Roll Forward] |  |  |  |  |
Balance, beginning of year | 3,863,000 |  | 4,948,000 |  |
Exit costs | 1,926,000 | [1] | 848,000 | [1] | 1,247,000
Payments, net of sublease receipts | (2,227,000) |  | (2,200,000) |  |
Reclassification of certain lease liabilities, net | 171,000 |  | (166,000) |  |
Interest accretion | 328,000 |  | 433,000 |  |
Balance, end of year | 4,061,000 |  | 3,863,000 |  | 4,948,000
Less current portion included in other current liabilities | 1,361,000 |  | 1,116,000 |  |
Long-term portion included in other noncurrent liabilities | 2,700,000 |  | 2,747,000 |  |
Estimated net cash payments related to exit cost liabilities [Abstract] |  |  |  |  |
2013 | 1,551,000 |  |  |  |
2014 | 1,070,000 |  |  |  |
2015 | 380,000 |  |  |  |
2016 | 321,000 |  |  |  |
2017 | 323,000 |  |  |  |
Thereafter | 1,325,000 |  |  |  |
Total | 4,970,000 |  |  |  |
Less imputed interest | 909,000 |  |  |  |
Present value of exit cost liabilities | 4,061,000 |  |  |  |
Existing sublease arrangements | 1,800,000 |  |  |  |
Properties expected to enter into sublease arrangements in the future | 3,300,000 |  |  |  |
Accrued severance and other restructuring charges | $ 500,000 |  | $ 100,000 |  |
[1] | (1)Included as a component of operating (gains), losses and other charges, net.

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