Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 02, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ (40,880)	$ (37,227)	$ (51,314)
State tax, net of federal benefit	210	(469)	351
Stock-based compensation expense	(6,683)	(28,437)	(9,953)
Research and development tax credits	(11,033)	(10,371)	(7,629)
Foreign rate differential	2,935	12,299	18,667
Change in valuation allowance	61,050	85,533	(44,784)
Foreign on-shoring intellectual property	0	(20,371)	0
Remeasurement of deferred tax assets and liabilities due to tax reform	0	0	97,280
Other	722	132	1,271
Provision for income taxes	$ 6,321	$ 1,089	$ 3,889	[1]

[1]