Equity - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 shares	May 31, 2021 USD ($) shares	Jul. 31, 2023 USD ($) vote $ / shares shares	Jul. 31, 2022 USD ($) shares	Jul. 31, 2023 USD ($) vote $ / shares shares	Jul. 31, 2022 USD ($) shares	Jan. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Oct. 18, 2021 $ / shares shares	Sep. 30, 2021 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			62,712		62,712		194,304
Deferred compensation liability, noncurrent			$ 800		$ 800		$ 1,800
Options granted (in shares) | shares			0	0	0	0
Intrinsic value of options exercised			$ 33,300	$ 25,800	$ 65,900	$ 59,800
Compensation expense not yet recognized			32,000		32,000		$ 46,200
Total stock-based compensation expense			46,368	37,747	$ 78,698	$ 55,218
Grant date fair value of RSUs granted		$ 8,800
Offering period					24 months	24 months
Tax benefit for stock-based compensation expense			3,600	2,200	$ 6,400	$ 3,100
Charitable donation of common stock			2,675		$ 5,350
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 9 months 18 days		2 years 1 month 6 days
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			362,000		$ 362,000		$ 254,800
Period for recognition (in years)					3 years 3 months 18 days		3 years 2 months 12 days
RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					5 years 3 months 18 days
Total stock-based compensation expense			400	400	$ 800	800
Compensation expense not yet recognized			5,100		$ 5,100
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)					2 years 4 months 24 days
RSUs granted in period (in shares) | shares	400,000
Total stock-based compensation expense			(100)		$ 300
Compensation expense not yet recognized			6,300		$ 6,300
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			6,700	9,700	$ 11,200	14,100
Compensation expense not yet recognized			19,800		19,800
Plan modification, cost not yet recognized			$ 9,400	$ 9,900	$ 9,400	$ 9,900
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
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			52,647		133,389
Charitable donation of common stock			$ 2,700		$ 5,300
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		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
Class B Common Stock | 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