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Defined Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 27, 2013
Dec. 26, 2012
Mar. 27, 2013
Pension Plan [Member]
Mar. 28, 2012
Pension Plan [Member]
Mar. 27, 2013
Other Defined Benefit Plans [Member]
Mar. 28, 2012
Other Defined Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]            
Service cost     $ 100,000 $ 84,000 $ 0 $ 0
Interest cost     754,000 789,000 28,000 29,000
Expected return on plan assets     (1,124,000) (1,012,000) 0 0
Amortization of net loss     419,000 428,000 18,000 13,000
Net periodic benefit cost     149,000 289,000 46,000 42,000
Contributions made to qualified pension plan and other defined benefit plans     1,400,000 300,000 100,000 100,000
Expected additional contributions to be made to qualified pension plan and other defined benefit plans     1,400,000   100,000  
Reclassification from accumulated other comprehensive income current period, net of tax     300,000      
Additional minimum pension liability $ 24,700,000 $ 25,000,000