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Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 17 Months Ended
Jun. 08, 2021
vote
$ / shares
shares
Jul. 31, 2025
USD ($)
Oct. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
class
plan
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
class
plan
$ / shares
shares
Sep. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2018
shares
Sep. 30, 2025
USD ($)
class
plan
$ / shares
shares
May 01, 2024
USD ($)
Jun. 30, 2021
$ / 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
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001   $ 0.001   $ 0.001   $ 0.001   $ 0.001
Preferred stock, outstanding (in shares)       0   0   0   0    
Preferred stock, issued (in shares)       0   0   0   0    
Number of classes of common stock | class       2   2       2    
Common stock, authorized (in shares)       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    
Common stock, outstanding (in shares)       188,090,000   188,090,000   188,875,000   188,090,000    
Stock repurchase program, authorized amount | $                     $ 500,000  
Repurchase and retirement of common stock (in shares)                   4,496,467    
Repurchase and retirement of common stock | $       $ 21,479 $ 21,866 $ 144,580 $ 70,302     $ 220,200    
Stock repurchase program, remaining authorized repurchase amount | $       279,800   $ 279,800       $ 279,800    
Accrued excise taxes | $       $ 300       $ 0        
Number of shares called by warrants (in shares)       229,000   229,000       229,000    
Stock based compensation expense | $       $ 29,474 $ 17,868 $ 51,339 34,958          
Number of equity incentive plans | plan       3   3       3    
Options outstanding in period (in shares)       11,883,000   11,883,000   13,013,000   11,883,000    
Aggregate intrinsic value of options | $           $ 57,400 55,100          
Unamortized compensation expense, option | $       $ 7,300   $ 7,300       $ 7,300    
Stock options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unamortized compensation expense, weighted average period of recognition           1 year 7 months 24 days            
Award vesting period (in years)           4 years            
Expiration period from the date of grant (in years)           10 years            
Restricted Stock Units (RSUs)                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unamortized stock-based compensation expense excluding option | $       $ 135,300   $ 135,300       $ 135,300    
Unamortized compensation expense, weighted average period of recognition           2 years 1 month 24 days            
Total fair value of non-option instrument | $           $ 62,000 21,900          
Other than options granted in period (in shares)           1,570,000            
Forfeited (in shares)           242,000            
Outstanding unvested (in shares)       3,644,000   3,644,000   3,347,000   3,644,000    
Vested (in shares)           1,031,000            
Restricted Stock Units (RSUs) | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period (in years)           2 years            
Restricted Stock Units (RSUs) | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period (in years)           4 years            
Performance-Based Restricted Stock Units                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock based compensation expense | $           $ 2,300            
Other than options granted in period (in shares)           685,500            
Maximum percentage earned of shares originally granted (percent)   300.00%   200.00%   200.00%       200.00%    
Achievement threshold for additional shares, percent       100.00%   100.00%       100.00%    
Forfeited (in shares)           61,578            
Outstanding unvested (in shares)       1,014,314   1,014,314   480,030   1,014,314    
Vested (in shares)           89,638            
Outstanding unvested (in shares)           866,030            
Unamortized compensation expense, option, non option | $       $ 28,000   $ 28,000       $ 28,000    
Retention and incentive equity award | $   $ 30,000                    
Shares originally granted | $   $ 23,000                    
Probable of achievement shares, percent       100.00%   100.00%       100.00%    
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)       2,114,582   2,114,582       2,114,582    
Options outstanding in period (in shares)       2,568,000   2,568,000       2,568,000    
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 | $           $ 2,300            
Warrant outstanding, (in years)     10 years                  
Warrants outstanding, vesting period (in years)     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)           50,167            
Outstanding shares under warrant (in shares)       229,333   229,333   279,500   229,333    
Unamortized stock-based compensation expense excluding option | $       $ 13,400   $ 13,400       $ 13,400    
Unamortized compensation expense, weighted average period of recognition           2 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 (in years)     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)       137,192,232   137,192,232       137,192,232    
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)       50,897,811   50,897,811       50,897,811