Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Property, Plant and Equipment [Line Items]
Net book value of equipment and machinery	$ 101,006	$ 115,471
Depreciation	23,200	21,100	$ 21,800
Machinery and equipment | Foundry in China
Property, Plant and Equipment [Line Items]
Net book value of equipment and machinery	5,500	7,600
Machinery and equipment | Foundry In Malaysia [Member]
Property, Plant and Equipment [Line Items]
Net book value of equipment and machinery	$ 1,600	$ 2,300