Segment Information Revenue by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 25, 2015	Oct. 26, 2014	Jul. 27, 2014	Apr. 27, 2014	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Apr. 28, 2013	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Geographic Information And Concentration Of Risk [Line Items]
Net sales	$ 130,394	$ 148,890	$ 145,742	$ 132,859	$ 126,534	$ 141,026	$ 165,010	$ 162,407	$ 557,885	$ 594,977	$ 578,827
Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Net sales									412,514	432,097	405,179
North America
Geographic Information And Concentration Of Risk [Line Items]
Net sales									85,139	94,574	98,401
Europe
Geographic Information And Concentration Of Risk [Line Items]
Net sales									$ 60,232	$ 68,306	$ 75,247
Net sales revenue
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									100.00%	100.00%	100.00%
Net sales revenue | Asia-Pacific
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									74.00%	73.00%	70.00%
Net sales revenue | North America
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									15.00%	16.00%	17.00%
Net sales revenue | Europe
Geographic Information And Concentration Of Risk [Line Items]
Concentration risk, percentage									11.00%	11.00%	13.00%