Share-Based Compensation - Allocation of Stock-based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 73,859	$ 47,936	$ 30,828
Net change in share-based compensation capitalized into inventory	0	(414)	38
Revenue offset (Warrant)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	21,501	16,219	5,396
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,639	1,477	1,591
Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	41,581	22,423	18,019
Product development and engineering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 9,138	$ 7,817	$ 5,822