Income Taxes - Components of Provision for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Current tax provision
Federal	$ 0	$ 0	$ 749
State	0	0	0
Foreign	16,034	8,709	7,810
Subtotal	16,034	8,709	8,559
Deferred tax provision (benefit)
Federal	107	6,679	508
State	0	(96)	(100)
Foreign	2,258	(6,410)	(419)
Subtotal	2,365	173	(11)
Provision for taxes	$ 18,399	$ 8,882	$ 8,548