Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 28, 2012	Sep. 30, 2012	Jun. 29, 2012	Mar. 31, 2012	Dec. 30, 2011	Mar. 31, 2011	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Revenue by geographic area
Sales	$ 90,067	$ 100,849	$ 101,949	$ 110,565	$ 86,873	$ 126,719	$ 403,430	$ 452,639	$ 443,134
United States [Member]
Revenue by geographic area
Sales							313,758	357,306	399,830
China [Member]
Revenue by geographic area
Sales							24,664	23,564	20,424
Singapore [Member]
Revenue by geographic area
Sales							62,143	52,608	13,359
Asia [Member]
Revenue by geographic area
Sales							2,772	12,069	7,697
Europe [Member]
Revenue by geographic area
Sales							$ 93	$ 7,092	$ 1,824