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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended 21 Months Ended 24 Months Ended 85 Months Ended
Jun. 08, 2021
vote
$ / shares
shares
Oct. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
plan
class
$ / shares
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
plan
class
$ / shares
shares
Sep. 30, 2024
USD ($)
plan
class
$ / shares
shares
Sep. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
$ / shares
shares
Mar. 31, 2018
shares
Sep. 30, 2024
USD ($)
plan
class
$ / shares
shares
Apr. 30, 2024
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
May 01, 2024
USD ($)
Oct. 26, 2023
USD ($)
Jun. 01, 2023
USD ($)
Oct. 28, 2022
USD ($)
May 12, 2022
USD ($)
Jun. 30, 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   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   $ 0.001   $ 0.001           $ 0.001  
Preferred stock, outstanding (in shares)     0   0 0   0   0   0              
Preferred stock, issued (in shares)     0   0 0   0   0   0              
Number of classes of common stock | class     2   2 2       2                  
Common stock, authorized (in shares)     1,500,000,000   1,500,000,000 1,500,000,000   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   $ 0.001   $ 0.001   $ 0.001              
Common stock, outstanding (in shares)     186,781,000   186,781,000 186,781,000   186,562,000   186,781,000   186,562,000              
Stock repurchase program, authorized amount | $                         $ 500,000 $ 410,000 $ 410,000 $ 410,000 $ 410,000    
Repurchase and retirement of common stock (in shares)         1,021,233           16,480,514                
Repurchase and retirement of common stock | $     $ 21,866 $ 170,363 $ 30,000 $ 70,302 $ 191,468                        
Stock repurchase program, remaining authorized repurchase amount | $     $ 470,000   $ 470,000 $ 470,000       $ 470,000                  
Repurchase and retirement of common stock, excise taxes | $               $ 1,500   $ 1,500                  
Number of shares called by warrants (in shares)     315,000   315,000 315,000       315,000                  
Stock based compensation expense | $     $ 17,868 $ 13,447   $ 34,958 27,448                        
Number of equity incentive plans | plan     3   3 3       3                  
Options outstanding in period (in shares)     15,375,000   15,375,000 15,375,000   17,480,000   15,375,000   17,480,000              
Aggregate intrinsic value of options | $           $ 55,100 61,800                        
Unamortized compensation expense, option | $     $ 15,900   $ 15,900 $ 15,900       $ 15,900                  
Stock options                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Unamortized compensation expense, weighted average period of recognition           2 years 4 months 2 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 stock-based compensation expense excluding option | $     $ 104,200   $ 104,200 $ 104,200       $ 104,200                  
Unamortized compensation expense, weighted average period of recognition           2 years 5 months 1 day                          
Total fair value of non-option instrument | $           $ 21,900 11,300                        
Other than options granted in period (in shares)           2,599,000                          
Outstanding unvested (in shares)     3,874,000   3,874,000 3,874,000   2,093,000   3,874,000   2,093,000              
Vested (in shares)           731,000                          
Restricted Stock Units (RSUs) | Minimum                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Award vesting period           3 years                          
Restricted Stock Units (RSUs) | Maximum                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Award vesting period           4 years                          
Performance-Based Restricted Stock Units                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Other than options granted in period (in shares)           4,897                          
Vested (in shares)           66,654                          
Unamortized compensation expense, option, non option | $     $ 1,400   $ 1,400 $ 1,400       $ 1,400                  
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)     2,044,582   2,044,582 2,044,582       2,044,582                  
Options outstanding in period (in shares)     2,638,000   2,638,000 2,638,000       2,638,000                  
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 (in shares)                                     250,000
Exercise price called by warrants (in dollars per share) | $ / shares                                     $ 0.72
Warrants exercised in period , intrinsic value | $                       $ 6,700              
U.S. News Warrant                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Number of shares called by warrants (in shares)   516,000                                  
Exercise price called by warrants (in dollars per share) | $ / shares   $ 12.56                                  
Warrants exercised in period , intrinsic value | $           $ 3,600                          
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 $ 2,700                        
Shares exercised under warrant (in shares)           200,667                          
Outstanding shares under warrant (in shares)     315,333   315,333 315,333       315,333                  
Unamortized stock-based compensation expense excluding option | $     $ 18,800   $ 18,800 $ 18,800       $ 18,800                  
Unamortized compensation expense, weighted average period of recognition           3 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                                  
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)     128,216,478   128,216,478 128,216,478       128,216,478                  
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)     58,564,170   58,564,170 58,564,170       58,564,170                  
Common Stock                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Conversion of stock (in shares) 85,523,836