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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 28, 2022
USD ($)
May 27, 2022
shares
May 12, 2022
USD ($)
Jun. 08, 2021
vote
$ / shares
shares
Nov. 30, 2022
USD ($)
Oct. 31, 2021
USD ($)
$ / shares
Year
shares
Jun. 30, 2021
$ / shares
shares
Sep. 30, 2022
USD ($)
equity_incentive_plan
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
equity_incentive_plan
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Mar. 31, 2018
shares
Mar. 31, 2022
$ / 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     100,000,000  
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  
Common stock, authorized (in shares)               1,500,000,000   1,500,000,000     1,500,000,000  
Common stock, par value (in dollars per share) | $ / shares               $ 0.001   $ 0.001     $ 0.001  
Conversion of stock, conversion ratio             1              
Common stock, outstanding (in shares)               192,302,000   192,302,000     192,398,000  
Stock repurchase program, authorized amount | $     $ 70,000                      
Stock repurchase program, period in force     12 months                      
Repurchase and retirement of common stock (in shares)                   2,150,982        
Repurchase and retirement of common stock | $               $ 61,168   $ 70,042 $ 2,698      
Number of shares called by warrants               641,000   641,000        
Stock based compensation expense | $               $ 11,353 $ 6,672 $ 20,859 11,799      
Number of equity incentive plans | equity_incentive_plan               3   3        
Options outstanding in period (in shares)               24,789,000   24,789,000     26,983,000  
Aggregate intrinsic value of options | $                   $ 60,200 $ 207,000      
Unamortized compensation expense, option | $               $ 45,500   $ 45,500        
Weighted-average grant-date fair value of options granted (in dollars per share) | $ / shares                     $ 10.73      
Subsequent Event                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock repurchase program, authorized amount | $ $ 70,000                          
Stock repurchase program, period in force 12 months                          
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 1 month 9 days        
Award vesting period                   4 years        
Expiration period from the date of grant                   10 years        
Restricted Stock Units (RSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unamortized compensation expense excluding option | $               $ 45,300   $ 45,300        
Unamortized compensation expense, weighted average period of recognition                   3 years 2 months 26 days        
Award vesting period                   4 years        
Total fair value of non-option instrument | $                   $ 3,300 $ 300      
Outstanding unvested (in shares)               1,296,000   1,296,000     534,000  
Restricted Stock Units (RSUs) | Subsequent Event | Forecast                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting period         4 years                  
Non-option instrument, grants in period, amount | $         $ 11,600                  
Non-option instrument, average closing market price, trailing period         30 days                  
Performance-Based Restricted Stock Units                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unamortized compensation expense excluding option | $               $ 2,500   $ 2,500        
Outstanding unvested (in shares)               195,048   195,048        
Outstanding unvested, probable to vest (in shares)               78,830   78,830        
2021 Plan                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of additional shares authorized   9,619,921                        
ESPP                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of additional shares authorized   1,923,984                        
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)               2,027,917   2,027,917        
Options outstanding in period (in shares)               2,654,665   2,654,665        
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                           10 years
Warrants exercised in period (in shares)                   125,000        
Warrants exercised in period , intrinsic value | $                   $ 4,000        
Warrant outstanding (in shares)               125,000   125,000        
U.S. News Warrant                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares called by warrants           516,000                
Exercise price called by warrants (in dollars per share) | $ / shares           $ 12.56                
Warrant outstanding, term           10 years                
Warrants outstanding, vesting period           6 years 5 months 23 days                
Fair value of warrant | $           $ 34,700                
Stock based compensation expense | $                   $ 2,700        
Unamortized compensation expense excluding option | $               $ 29,500   $ 29,500        
Unamortized compensation expense, weighted average period of recognition                   5 years 6 months        
U.S. News Warrant | Share-Based Payment Arrangement, Subsequent to Tranche One                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants outstanding, vesting period           6 years                
U.S. News Warrant | Measurement Input, Share Price                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input | $ / shares           76.50                
U.S. News Warrant | Measurement Input, Price Volatility                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input           0.469                
U.S. News Warrant | Measurement Input, Risk Free Interest Rate                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input           0.0161                
U.S. News Warrant | Measurement Input, Expected Term                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input | Year           10                
U.S. News Warrant | Measurement Input, Expected Dividend Rate                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrant, measurement input           0                
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)               111,262,831   111,262,831        
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                    
Conversion of stock, conversion ratio       1                    
Common stock, outstanding (in shares)               81,039,460   81,039,460