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Defined Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 27, 2012
Dec. 28, 2011
Jun. 27, 2012
Pension Plan [Member]
Jun. 29, 2011
Pension Plan [Member]
Jun. 27, 2012
Pension Plan [Member]
Jun. 29, 2011
Pension Plan [Member]
Jun. 27, 2012
Other Defined Benefit Plans [Member]
Jun. 29, 2011
Other Defined Benefit Plans [Member]
Jun. 27, 2012
Other Defined Benefit Plans [Member]
Jun. 29, 2011
Other Defined Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]                    
Service cost     $ 106,000 $ 73,000 $ 190,000 $ 167,000 $ 0 $ 0 $ 0 $ 0
Interest cost     811,000 850,000 1,600,000 1,682,000 29,000 31,000 58,000 63,000
Expected return on plan assets     (1,006,000) (1,046,000) (2,018,000) (2,091,000) 0 0 0 0
Amortization of net loss     453,000 263,000 881,000 502,000 13,000 8,000 26,000 16,000
Net periodic benefit cost     364,000 140,000 653,000 260,000 42,000 39,000 84,000 79,000
Contributions made to qualified pension plan and other defined benefit plans         800,000 400,000     100,000 100,000
Additional contribution made to qualified pension plan and other defined benefit plans     1,100,000   1,100,000   100,000   100,000  
Additional minimum pension liability $ 24,300,000 $ 24,800,000