Derivative Financial Instruments - Information about Gains (Losses) Associated with Derivative Financial Instruments (Details) - Cash flow hedges - Foreign currency forward contracts - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 838	$ (421)	$ (2,111)
Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	737	(390)	(1,930)
Selling and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	15	(5)	(24)
General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) in Statement of Operations	$ 86	$ (26)	$ (157)