Geographic Information and Concentration of Risk - Net Sales Activity by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 150,603	$ 160,878	$ 150,704	$ 116,642	$ 104,032	$ 123,944	$ 130,254	$ 122,371	$ 578,827	$ 480,601	$ 454,502
North America
Geographic Information And Concentration Of Risk [Line Items]
Net sales									98,401	114,552	112,404
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales									405,179	298,477	272,079
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales									$ 75,247	$ 67,572	$ 70,019
Net sales revenue
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									100.00%	100.00%	100.00%
Net sales revenue | North America
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									17.00%	24.00%	25.00%
Net sales revenue | Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									70.00%	62.00%	60.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									13.00%	14.00%	15.00%