Equity - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2022 shares	May 31, 2021 USD ($) shares	Jul. 31, 2022 USD ($)	Oct. 31, 2023 USD ($)	Jan. 31, 2024 USD ($) vote $ / shares shares	Jan. 31, 2023 USD ($) $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Oct. 18, 2021 $ / shares shares	Oct. 17, 2021 USD ($) shares	Sep. 30, 2021 shares	Jan. 31, 2021 USD ($) 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
Preferred stock, par value (in USD per share) | $ / shares					$ 0.0000025	$ 0.0000025			$ 0.0000025
Shares subject to repurchase obligation (in shares) | shares					22,278	194,304
Deferred compensation liability, noncurrent					$ 400	$ 1,800
Convertible preferred stock, shares outstanding (in shares) | shares					0	0	0			79,600,000		79,551,000
Carrying value of of convertible preferred stock							$ 0			$ 424,900		$ 424,904
Convertible preferred stock, shares issued (in shares) | shares					0	0
Award vesting period (in years)					4 years
Options granted (in shares) | shares					0	0	7,936,000
Aggregate intrinsic value, options vested					$ 17,900	$ 31,000	$ 10,800
Options granted (in USD per share) | $ / shares							$ 10.81
Intrinsic value of options exercised					128,800	123,400	$ 280,500
Compensation expense not yet recognized					21,900
Total stock-based compensation expense					163,049	122,567	30,009
Grant date fair value of RSUs granted		$ 8,800
Offering period			24 months	24 months
Tax benefit for stock-based compensation expense					0	7,700	7,000
Charitable donation of common stock					$ 10,700
Shares subject to outstanding common stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					1 year 6 months
Total stock-based compensation expense					$ 17,600	23,200	22,600
Shares subject to outstanding common stock options | 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)					10 years
Shares subject to outstanding common 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
Shares subject to outstanding common 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					$ 347,800
Period for recognition (in years)					3 years
Total stock-based compensation expense					$ 117,600	61,600	700
RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					4 years 9 months 18 days
PSUs granted (in shares) | shares		3,000,000
Total stock-based compensation expense					$ 1,700	1,700	1,200
Compensation expense not yet recognized					$ 4,300
RSUs | Minimum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					2 years
RSUs | Maximum | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					7 years
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)					1 year 10 months 24 days
PSUs granted (in shares) | shares	400,000
Total stock-based compensation expense					$ 1,300	1,600
Compensation expense not yet recognized					$ 2,600
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%
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
Total stock-based compensation expense					$ 19,000	$ 25,700	$ 5,100
Compensation expense not yet recognized					$ 13,500
Plan modification, cost not yet recognized			$ 9,900	$ 9,400
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
Common stock, par value (in USD per share) | $ / shares					$ 0.0000025	$ 0.0000025			$ 0.0000025
Voting rights, vote per share | vote					1
Common stock reserved for future issuance (in shares) | shares											1,635,545
Aggregate principal amount, donation								$ 10,700
Charitable donation of common stock (in shares) | shares					231,408
Charitable donation of common stock					$ 10,700
Class A Common Stock | 2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares											13,032,289
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
Common stock, par value (in USD per share) | $ / shares					$ 0.0000025	$ 0.0000025			$ 0.0000025
Voting rights, vote per share | vote					10
Class B Common Stock | RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs granted (in shares) | shares		3,000,000