Income Taxes - Components of Provision for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Current income tax provision
Federal	$ (147)	$ 2,108	$ 0
State	0	0	0
Foreign	21,753	13,442	16,034
Subtotal	21,606	15,550	16,034
Deferred income tax (benefit) provision
Federal	(25,367)	7,701	107
State	0	0	0
Foreign	3,677	(60)	2,258
Subtotal	(21,690)	7,641	2,365
(Benefit) Provision for income taxes	$ (84)	$ 23,191	$ 18,399