Restructuring Charges (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012 Person	Jul. 03, 2011 Person
Restructuring Charges (Textual) [Abstract]
Restructuring and restructuring-related charges, excluding asset impairments and write-offs	$ 3,139	$ 694	$ 3,139	$ 694
Restructuring and Related Cost, Positions Eliminated [Abstract]
Elimination of workforce			260	30
Components and Sensors segment [Member]
Restructuring Charges (Textual) [Abstract]
Restructuring and restructuring-related charges, excluding asset impairments and write-offs			1,200	500
E M S Segment [Member]
Restructuring Charges (Textual) [Abstract]
Restructuring and restructuring-related charges, excluding asset impairments and write-offs			$ 2,600	$ 200