Restructuring Charges (Details 1) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012 June 2012 Plan [Member]	Jul. 01, 2012 April 2011 Plan [Member]	Jan. 01, 2011 April 2011 Plan [Member]
Restructuring reserve activity
Restructuring liability at beginning
Restructuring and restructuring-related charges, excluding asset impairments and write-offs	3,139,000	694,000	3,139,000	694,000	2,000,000	700,000
Cost paid					(700,000)	(700,000)
Restructuring liability at ending					$ 1,300,000