Income Taxes - Components of Provision for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Current income tax provision (benefit)
Federal	$ 6,463	$ (147)	$ 2,108
State	100	0	0
Foreign	11,861	21,753	13,442
Subtotal	18,424	21,606	15,550
Deferred income tax provision (benefit)
Federal	74	(24,928)	7,363
State	(33)	0	0
Foreign	(5,637)	3,677	(60)
Subtotal	(5,596)	(21,251)	7,303
Provision for income taxes	$ 12,828	$ 355	$ 22,853