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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
shares
May 31, 2022
USD ($)
Sep. 30, 2021
date
shares
May 31, 2021
USD ($)
shares
Jul. 31, 2022
USD ($)
vote
$ / shares
shares
Jul. 31, 2021
USD ($)
Apr. 30, 2021
Jul. 31, 2022
USD ($)
vote
$ / shares
shares
Jul. 31, 2021
USD ($)
$ / shares
Oct. 31, 2016
Jan. 31, 2022
USD ($)
$ / shares
shares
Jan. 31, 2021
Oct. 18, 2021
$ / shares
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         388,331     388,331     713,967    
Deferred compensation liability, noncurrent         $ 3,800     $ 3,800     $ 6,800    
Options granted (in USD per share) | $ / shares                 $ 8.35        
Weighted average grant date fair value (in dollars per share) | $ / shares                 $ 7.90        
Intrinsic value of options exercised         25,800 $ 8,500              
Aggregate intrinsic value, options vested               59,800 $ 25,800        
Compensation expense not yet recognized         62,400     62,400     $ 80,300    
Stock-based compensation         37,747 5,232   55,218 8,663        
Issuance of common stock under employee stock purchase plan         9,554     9,554          
Grant date fair value of RSUs granted       $ 8,800                  
Number of purchase dates | date     4                    
Tax benefit for stock-based compensation expense         $ 2,200 $ 0   $ 3,100 $ 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          
RSUs granted in period (in shares) | shares       3,000,000                  
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                    
Shares subject to the 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         $ 9,700     $ 14,100          
Compensation expense not yet recognized         31,700     31,700          
Issuance of common stock under employee stock purchase plan   $ 300                      
Discount rate (as a percent)     15.00%                    
Look-back period (in months)     27 months                    
Tax benefit for stock-based compensation expense         700     700          
Plan modification, cost not yet recognized         9,200     $ 9,200          
Stock options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Period for recognition (in years)               2 years 4 months 24 days       2 years 8 months 12 days  
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         235,700     $ 235,700     $ 21,500    
Period for recognition (in years)             3 years 10 months 24 days 3 years 6 months          
RSUs granted in period (in shares) | shares               5,103,000     3,290,000    
RSUs | Chief Executive Officer                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock-based compensation         400     $ 800          
Compensation expense not yet recognized         6,800     $ 6,800          
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 | 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)               3 years 4 months 24 days          
RSUs granted in period (in shares) | shares 400,000                        
Stock-based compensation               $ 700          
Compensation expense not yet recognized         $ 18,500     $ 18,500          
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%