Income Taxes - Valuation Allowance Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 02, 2020	Feb. 03, 2019	Jan. 28, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, as of beginning of period	$ 172,481	$ 115,143	$ 43,015
Valuation allowances established	69,009	57,232	88,768
Changes to existing valuation allowances	1,484	106	(16,640)
Release of valuation allowances	0	0	0
Valuation allowance, as of end of period	$ 242,974	$ 172,481	$ 115,143