Income Taxes - Significant Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Deferred Tax Assets, Net [Abstract]
Net operating loss carryforwards	$ 21,558	$ 341,487
Research and development credit carryforwards	9,985	12,191
Stock-based compensation	44,490	37,255
Accruals and reserves	14,475	29,195
Deferred revenue	260,322	6,565
Capitalized research expenditures	131,010	0
Operating lease liabilities	25,892	27,842
Total deferred tax assets	507,732	454,535
Valuation allowance	(12,605)	(335,051)
Total deferred tax assets net of valuation allowance	495,127	119,484
Deferred Tax Liabilities, Net [Abstract]
Property and equipment and intangible assets	(26,733)	(17,229)
Deferred contract acquisition costs	(62,814)	(76,593)
Operating right-of-use assets	(23,466)	(25,550)
Total deferred tax liabilities	(113,013)	(119,372)
Net deferred tax assets	$ 382,114	$ 112