Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 1,858,730,000	$ 599,603,000
Increase in valuation allowance	(1,300,000,000)	434,500,000	$ 81,100,000
Net operating loss carryforwards, U.S. federal	5,800,000,000
Net operating loss carryforwards, state	4,500,000,000
Net operating loss carryforwards, foreign	162,700,000
Interest and penalties	0	$ 0	$ 0
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards, not subject to expiration	5,700,000,000
Net operating loss carryforward, subject to expiration	100,000,000
Tax credits	199,700,000
Deferred tax assets, tax credit carryforward, subject to expiration	199,700,000
Foreign
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards, not subject to expiration	149,600,000
Net operating loss carryforward, subject to expiration	13,100,000
State
Tax Credit Carryforward [Line Items]
Tax credits	88,900,000
Deferred tax assets, tax credit carryforward, not subject to expiration	$ 88,900,000