Segment Information - Long-lived Assets by Region (Details) - USD ($) $ in Thousands	Jan. 26, 2020	Jan. 27, 2019
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	$ 124,418	$ 118,488
United States
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	54,357	46,285
Rest of North America [Member]
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	32,559	34,493
Europe
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	11,369	8,839
Asia and All Others
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	$ 26,133	$ 28,871