Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Feb. 02, 2020	Feb. 03, 2019	Jan. 28, 2018	Jan. 31, 2017
Tax Credit Carryforward [Line Items]
Current income tax provision	$ 0	$ 0	$ 0
Deferred income tax provision	0	0	0
Net operating loss carryforwards subject to expiration	402,400,000
Net operating loss carryforwards not subject to expiration	716,100,000
Net operating loss carryforwards	190,307,000	156,360,000
Deferred tax assets valuation allowance	242,974,000	172,481,000	115,143,000	$ 43,015,000
Change in valuation allowance	70,500,000
Change in valuation allowance due to current year losses	74,300,000
Change in valuation allowance due to state blended tax rate	1,500,000
Change in valuation allowance, other	(5,300,000)
Unrecognized tax benefits	0	0
Proceeds from tax sharing agreement with Parent	17,300,000	$ 0	$ 0
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	836,900,000
State Tax Authority
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 281,600,000