Equity - Narrative (Details)		1 Months Ended			6 Months Ended	12 Months Ended
	Jan. 31, 2023 USD ($) vote $ / shares shares	Jun. 30, 2022 shares	Sep. 30, 2021 date shares	May 31, 2021 USD ($) shares	Jul. 31, 2021	Jan. 31, 2023 USD ($) vote $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Oct. 18, 2021 $ / shares shares	Oct. 17, 2021 USD ($) shares	Jan. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares) | shares	50,000,000					50,000,000	50,000,000		50,000,000
Preferred stock, par value (in USD per share) | $ / shares	$ 0.0000025					$ 0.0000025	$ 0.0000025		$ 0.0000025
Shares subject to repurchase obligation (in shares) | shares	194,304					194,304	713,967
Deferred compensation liability, noncurrent	$ 1,800,000					$ 1,800,000	$ 6,800,000
Convertible preferred stock, shares outstanding (in shares) | shares	0					0	0	79,551,000		79,600,000	79,959,000
Carrying value of convertible preferred stock	$ 0					$ 0	$ 0	$ 424,904,000		$ 424,900,000	$ 425,146,000
Convertible preferred stock, shares issued (in shares) | shares	0					0	0
Award vesting period (in years)						4 years
Options granted (in shares) | shares						0	7,936,000	4,622,000
Aggregate intrinsic value, options vested						$ 31,000,000	$ 10,800,000	$ 8,200,000
Options granted (in USD per share) | $ / shares							$ 10.81	$ 3.55
Intrinsic value of options exercised						123,400,000	$ 280,500,000	$ 33,800,000
Compensation expense not yet recognized	$ 46,200,000					46,200,000	80,300,000
Stock-based compensation						122,567,000	30,009,000	111,846,000
Grant date fair value of RSUs granted				$ 8,800,000
Issuance of common stock under employee stock purchase plan						14,378,000
Tax benefit for stock-based compensation expense						$ 7,700,000	$ 7,000,000	$ 0
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares	1,500,000,000					1,500,000,000	1,500,000,000		1,500,000,000
Common stock, par value (in USD per share) | $ / shares	$ 0.0000025					$ 0.0000025	$ 0.0000025		$ 0.0000025
Voting rights, vote per share | vote	1					1
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares	250,000,000					250,000,000	250,000,000		250,000,000
Common stock, par value (in USD per share) | $ / shares	$ 0.0000025					$ 0.0000025	$ 0.0000025		$ 0.0000025
Voting rights, vote per share | vote	10					10
2021 Equity Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares			13,032,289
2021 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield (as a percent)						0.00%	0.00%
2021 ESPP | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)						1 year 9 months 18 days
Stock-based compensation						$ 25,700,000	$ 5,100,000
Compensation expense not yet recognized	$ 21,100,000					21,100,000
Discount rate (as a percent)			15.00%
Look-back period (in months)			27 months
Number of purchase dates | date			4
Issuance of common stock under employee stock purchase plan	400,000
Tax benefit for stock-based compensation expense						2,800,000
Plan modification, cost not yet recognized	6,200,000					$ 6,200,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					2 years 8 months 12 days	2 years 1 month 6 days
Dividend yield (as a percent)						0.00%	0.00%	0.00%
Stock options | 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)						10 years
Stock options | 2015 Equity Incentive Plan | Period one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						25.00%
Award vesting period (in years)						1 year
Stock options | 2015 Equity Incentive Plan | Period two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						36 months
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense not yet recognized	254,800,000					$ 254,800,000	$ 21,500,000
Period for recognition (in years)						3 years 2 months 12 days	3 years 10 months 24 days
RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) | shares				3,000,000
Stock-based compensation						$ 1,700,000	$ 1,200,000
Compensation expense not yet recognized	5,900,000					$ 5,900,000
RSUs | Chief Executive Officer | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)						2 years
RSUs | Chief Executive Officer | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)						7 years
RSUs | Class B Common Stock | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) | shares				3,000,000
RSUs | 2021 Equity Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						2 years
RSUs | 2021 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						4 years
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		100.00%
Period for recognition (in years)						2 years 10 months 24 days
RSUs granted in period (in shares) | shares		400,000
Stock-based compensation						$ 1,600,000
Compensation expense not yet recognized	$ 7,400,000					$ 7,400,000
PSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		0.00%
PSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		200.00%