Share-Based Compensation - Allocation of Stock-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 52,049	$ 66,837	$ 50,051
Net change in share-based compensation capitalized into inventory	0	0	(414)
Revenue offset (Warrant)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	0	21,501	16,219
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,928	1,639	1,477
Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	38,556	35,430	24,266
Product development and engineering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 11,565	$ 8,267	$ 8,089