Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 segment	Jan. 01, 2011	Jan. 02, 2010
Segment Information
Number of operating segments	1
Revenue and property and equipment, net by geographic area
Revenue	$ 491,625	$ 493,341	$ 441,020
Property and equipment, net	25,141	29,945
United States
Revenue and property and equipment, net by geographic area
Revenue	67,432	69,753	54,065
Property and equipment, net	17,293	20,559
China
Revenue and property and equipment, net by geographic area
Revenue	152,533	137,703	105,509
South Korea
Revenue and property and equipment, net by geographic area
Revenue	70,252	65,409	91,974
Taiwan
Revenue and property and equipment, net by geographic area
Revenue	59,208	76,991	68,320
Singapore
Revenue and property and equipment, net by geographic area
Property and equipment, net	6,220	8,017
Japan
Revenue and property and equipment, net by geographic area
Revenue	50,270	34,031	28,874
Rest of world
Revenue and property and equipment, net by geographic area
Revenue	91,930	109,454	92,278
Property and equipment, net	$ 1,628	$ 1,369