Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2012 plan	Oct. 01, 2011	Sep. 29, 2012 plan	Oct. 01, 2011	Jan. 01, 2011	Jan. 03, 2009
Defined Benefit Plan Disclosure [Line Items]
Number Of Multiemployer Plans, Certified Orange Zone	1		1
Service cost	$ 82,000	$ 294,000	$ 245,000	$ 884,000
Interest cost	1,362,000	1,513,000	4,088,000	4,539,000
Expected return on plan assets	(1,677,000)	(1,722,000)	(5,032,000)	(5,166,000)
Amortization of prior service cost	23,000	23,000	67,000	67,000
Amortization of net loss	1,189,000	681,000	3,567,000	2,043,000
Net pension cost	979,000	789,000	2,935,000	2,367,000
Amount Company expects to contribute to its pension plans	300,000		300,000
Pension Contributions			1,800,000	10,200,000
Multiemployer Plans [Abstract]
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material	2		2
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone	1		1
Number of Multiemployer Plans, Certified Red Zone	4		4
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan	$ 1,000,000		$ 1,000,000		$ 1,200,000	$ 3,200,000
Number of Multiemployer Plans, Certified Yellow Zone	1		1
Maximum [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Contributions To Individual Plan, Percent			5.00%