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Equity - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 08, 2021
vote
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Apr. 30, 2010
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
Mar. 31, 2018
shares
Oct. 08, 2021
USD ($)
shares
Jun. 30, 2021
$ / shares
shares
Jun. 14, 2021
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Preferred stock, authorized (in shares)       100,000,000   100,000,000       100,000,000   0  
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001       $ 0.001   $ 0.001  
Preferred stock, issued (in shares)       0   0           0  
Preferred stock, outstanding (in shares)       0   0           0  
Forward split ratio 2                        
Common stock, authorized (in shares)       1,500,000,000   1,500,000,000           198,000,000  
Common stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001           $ 0.001  
Common stock, outstanding (in shares)       186,971,000   186,971,000           82,910,000  
Number of shares called by warrants       1,450,000   1,450,000           250,000  
Number of shares reserved for future issuance       61,345,000   61,345,000           114,663,000  
Options granted in period (in shares)           1,966,000              
Options outstanding in period (in shares)       32,763,000   32,763,000           36,576,000  
Aggregate intrinsic value of options | $           $ 207,000,000 $ 13,800,000            
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares           $ 10.73 $ 1.70            
Unamortized compensation expense, option | $       $ 62,800,000   $ 62,800,000              
Granted (in dollars per share) | $ / shares           $ 12.56              
Stock based compensation expense | $       $ 6,672,000 $ 1,179,000 $ 11,799,000 $ 2,162,000            
Share-based Payment Arrangement, Option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unamortized compensation expense, weighted average period of recognition           3 years 3 months 21 days              
Performance Shares                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options outstanding in period (in shares)       480,000   480,000              
Unamortized compensation expense, option | $       $ 700,000   $ 700,000              
Performance Shares | Chief Executive Officer                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options granted in period (in shares)   1,792,000                      
Unamortized compensation expense, option | $       700,000   $ 700,000              
Unamortized compensation expense, weighted average period of recognition           8 months 1 day              
Granted (in dollars per share) | $ / shares   $ 0.97                      
Stock based compensation expense | $       300,000   $ 1,200,000              
Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unamortized compensation expense, weighted average period of recognition           3 years 5 months 4 days              
Other than options granted in period (in shares)           224,123              
Unrecognized stock-based compensation, excluding option | $       $ 15,400,000   $ 15,400,000              
Granted (in dollars per share) | $ / shares           $ 76.60              
Unvested (in shares)       220,000   220,000           0  
Restricted Stock Units (RSUs) | Share-Based Payment Arrangement, Tranche One And Tranche Two                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of vesting shares           28,250              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche One                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting percentage           50.00%              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Two                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting percentage           50.00%              
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Three                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period           4 years              
Restricted Stock Units (RSUs) | Share-Based Payment Arrangement, Tranche Three, First Anniversary Of Vest Commencement Date                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting percentage           25.00%              
Restricted Stock Units (RSUs) | Share-Based Payment Arrangement, Tranche Three, Quarterly Basis Based On Continued Service                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period           36 months              
Performance-Based Restricted Stock Units                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock based compensation expense | $           $ 0              
Other than options granted in period (in shares)           15,239              
Granted (in dollars per share) | $ / shares           $ 80.00              
Forfeited (in shares)           600              
Unvested (in shares)       14,639   14,639              
2010 Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options outstanding in period (in shares)       30,054,000   30,054,000           33,856,000  
2010 Plan | Share-based Payment Arrangement, Option                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Award vesting period     4 years                    
Expiration period from the date of grant     10 years                    
2010 Plan | Individuals With Voting Interest Less Than Threshold                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Grant exercise price, percentage of estimated fair value of common stock on date of grant (not less than)     100.00%                    
2010 Plan | Individuals With Voting Interest At Threshold                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Grant exercise price, percentage of estimated fair value of common stock on date of grant (not less than)     110.00%                    
Voting interests threshold     10.00%                    
ESPP                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares reserved for future issuance                   4,500,000      
Maximum annual increase of shares reserved for future issuance (in shares)                   6,750,000      
Maximum annual increase of shares reserved for future issuance as a percentage of common stock outstanding                   1.00%      
Approved by Board of Directors, Outside of Plans                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options granted in period (in shares)               4,682,582          
Options exercised (in shares)       1,973,332   1,973,332              
Options outstanding in period (in shares)       2,709,250   2,709,250           2,720,000  
Contract With U.S. News & World Report, L.P.                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares called by warrants                         250,000
Exercise price called by warrants (in dollars per share) | $ / shares                         $ 0.72
Warrant outstanding, term                         5 years
U.S. News Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares called by warrants                     1,200,000    
Exercise price called by warrants (in dollars per share) | $ / shares                     $ 12.56    
Warrant outstanding, term                     6 years    
U.S. News Warrant | Subsequent Event                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares called by warrants                 516,000        
Fair value of warrant | $                 $ 35,000,000        
Class A and Class B Common Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Conversion of stock (in shares) 85,523,836                        
Common Class A                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock, authorized (in shares) 1,000,000,000                        
Common stock, par value (in dollars per share) | $ / shares $ 0.001                        
Common stock, number of votes per share | vote 1                        
Common stock, outstanding (in shares)       53,249,705   53,249,705              
Common Class B                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock, authorized (in shares) 500,000,000                        
Common stock, par value (in dollars per share) | $ / shares $ 0.001                        
Common stock, number of votes per share | vote 10                        
Common stock, outstanding (in shares)       133,721,051   133,721,051