Employee Benefits (Details) (USD $)	3 Months Ended				9 Months Ended		1 Months Ended	3 Months Ended
	Sep. 28, 2013	Jun. 29, 2013	Sep. 29, 2012	Jun. 30, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 Defined benefit pension plan plan	Sep. 28, 2013 Defined benefit pension plan plan
Target allocation and pension plan asset allocation
Number of defined benefit plans							2	2
Contributions made to defined benefit pension plans							$ 10,000,000
Contributions expected to be made to defined benefit pension plans								0
Components of net periodic benefit cost:
Service cost	2,342,000		2,221,000		7,026,000	6,657,000
Interest cost	2,028,000		2,220,000		6,131,000	6,655,000
Expected return on plan assets	(1,615,000)		(1,608,000)		(4,841,000)	(4,817,000)
Amortization and other	1,565,000		1,550,000		4,744,000	4,647,000
Agreement termination gain		(3,204,000)			(3,204,000)
Settlement				1,796,000		1,796,000
Net periodic benefit cost	4,320,000		4,383,000		9,856,000	14,938,000
Agreement termination gain, net of tax		1,954,000
Agreement termination gain unrecognized in other comprehensive income, before tax		2,148,000
Agreement termination gain unrecognized in other comprehensive income, net of tax		$ 1,310,000