CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands		Total	Redeemable Convertible Preferred Stock, Series F	Redeemable Convertible Preferred Stock, Series G-1 And G-2	Common Stock		Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2019		168,309,042
Beginning balance at Jan. 31, 2019		$ 910,853
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock (in shares)			1,612,230
Issuance of redeemable convertible preferred stock			$ 24,121
Stock-based compensation		$ 1,500
Ending balance (in shares) at Jan. 31, 2020		169,921,272
Ending balance at Jan. 31, 2020		$ 936,474
Beginning balance (in shares) at Jan. 31, 2019	[1]				45,559,637
Beginning balance at Jan. 31, 2019		$ (312,467)			$ 5	[1]	$ 39,296	$ 16	$ (351,784)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		9,735,006			9,735,006	[1]
Issuance of common stock upon exercise of stock options		$ 27,526			$ 1	[1]	27,525
Repurchase of early exercised stock options and restricted common stock (in shares)	[1]				(520,557)
Vesting of early exercised stock options and restricted common stock		5,791					5,791
Issuance of restricted common stock (in shares)	[1]				16,700
Issuance of common stock in connection with a business combination (in shares)	[1]				661,635
Issuance of common stock in connection with a business combination		4,749					4,749
Stock-based compensation		77,979					77,979
Other comprehensive income		200						200
Net loss		(348,535)							(348,535)
Ending balance (in shares) at Jan. 31, 2020	[1]				55,452,421
Ending balance at Jan. 31, 2020		$ (544,757)			$ 6	[1]	155,340	216	(700,319)
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of redeemable convertible preferred stock (in shares)				12,349,827
Issuance of redeemable convertible preferred stock				$ 478,573
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)		(182,271,099)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering		$ (1,415,047)
Ending balance (in shares) at Jan. 31, 2021		0
Ending balance at Jan. 31, 2021		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	[1]				182,271,099
Conversion of redeemable convertible preferred stock to common stock upon initial public offering		1,415,047			$ 18	[1]	1,415,029
Issuance of common stock upon initial public offering and private placements, net of underwriting discounts (in shares)	[1]				36,366,666
Issuance of common stock upon initial public offering and private placements, net of underwriting discounts		$ 4,242,284			$ 4	[1]	4,242,280
Issuance of common stock upon exercise of stock options (in shares)		13,798,741			13,798,741	[1]
Issuance of common stock upon exercise of stock options		$ 53,671					53,671
Exercise of common stock warrants (in shares)	[1]				32,241
Repurchase of early exercised stock options and restricted common stock (in shares)	[1]				(40,000)
Vesting of early exercised stock options and restricted common stock		5,592					5,592
Vesting of restricted stock units (in shares)	[1]				36,436
Stock-based compensation		303,513					303,513
Other comprehensive income		223						223
Net loss		(539,102)							(539,102)
Ending balance (in shares) at Jan. 31, 2021	[1]				287,917,604
Ending balance at Jan. 31, 2021		$ 4,936,471			$ 28	[1]	6,175,425	439	(1,239,421)
Ending balance (in shares) at Jan. 31, 2022		0
Ending balance at Jan. 31, 2022		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		20,902,509			20,902,509	[1]
Issuance of common stock upon exercise of stock options		$ 127,001			$ 3	[1]	126,998
Issuance of common stock under employee stock purchase plan (in shares)	[1]				370,452
Issuance of common stock under employee stock purchase plan		52,227					52,227
Vesting of early exercised stock options and restricted common stock		750					750
Vesting of restricted stock units (in shares)	[1]				3,186,218
Stock-based compensation		629,269					629,269
Other comprehensive income		(16,725)						(16,725)
Net loss		(679,948)							(679,948)
Ending balance (in shares) at Jan. 31, 2022	[1]				312,376,783
Ending balance at Jan. 31, 2022		$ 5,049,045			$ 31	[1]	$ 6,984,669	$ (16,286)	$ (1,919,369)

[1] On March 1, 2021, all shares of the Company’s then-outstanding Class B common stock were automatically converted into the same number of shares of Class A common stock, pursuant to the terms of the Company’s amended and restated certificate of incorporation. No additional shares of Class B common stock will be issued following such conversion. See Note 11 for further details.