Employee Benefit and Retirement Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	$ 2,334,000	$ 2,358,000	$ 4,668,000	$ 4,716,000
Expected return on plan assets	(2,703,000)	(2,418,000)	(5,406,000)	(4,836,000)
Net benefit (income) cost	(369,000)	(60,000)	(738,000)	(120,000)
Postretirement Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	62,000	33,000	124,000	66,000
Interest cost	70,000	91,000	140,000	182,000
Amortization of actuarial (gain)	(25,000)	(26,000)	(50,000)	(52,000)
Net benefit (income) cost	$ 107,000	$ 98,000	$ 214,000	$ 196,000