Geographic Information And Concentrations Of Risk (Net Sales Activity By Product Lines) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Oct. 31, 2010	Aug. 01, 2010	May 02, 2010
Product Information [Line Items]
Total Net Sales	$ 480,601	$ 454,502	$ 286,560
Total Net Sales, Percentage	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
Advanced Communications [Member]
Product Information [Line Items]
Total Net Sales	139,695	112,019	18,642
Total Net Sales, Percentage	29.00%	25.00%	7.00%
Wireless And Sensing [Member]
Product Information [Line Items]
Total Net Sales	57,124	59,107	38,821
Total Net Sales, Percentage	12.00%	13.00%	14.00%
Power Management And High Reliability [Member]
Product Information [Line Items]
Total Net Sales	74,056	87,693	82,787
Total Net Sales, Percentage	15.00%	19.00%	29.00%
Protection [Member]
Product Information [Line Items]
Total Net Sales	$ 209,726	$ 195,683	$ 146,310
Total Net Sales, Percentage	44.00%	43.00%	51.00%