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Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders’ Equity (Deficit) - Redeemable Shares Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
d
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
d
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
shares
Mar. 31, 2024
shares
Dec. 31, 2023
shares
Class of Stock [Line Items]                      
Temporary equity, shares issued (in shares) | shares   0       0   184,635,000      
Conversion of redeemable convertible preferred stock in connection with initial public offering       $ 558,982,000 $ 1,080,295,000            
Temporary equity, shares outstanding (in shares) | shares   0       0   184,635,000      
Aggregate Liquidation Preference               $ 1,618,059,000      
Reclassification of redeemable Class A common stock to Class A common stock   $ 1,163,159,000                  
Temporary equity, volume-weighted average price days | d   20       20          
Temporary equity, consecutive trading days | d   30       30          
Temporary Equity, Volume- weighted average price, per share | $ / shares   $ 68.16       $ 68.16          
IPO                      
Class of Stock [Line Items]                      
Conversion of redeemable convertible preferred stock in connection with initial public offering $ 559,000,000                    
Common Class A | IPO                      
Class of Stock [Line Items]                      
Conversion of stock, shares issued (in shares) | shares 155,111,700                    
Series C                      
Class of Stock [Line Items]                      
Temporary equity, shares issued (in shares) | shares               29,523,000      
Temporary equity, shares outstanding (in shares) | shares               29,523,000      
Issuance price (in dollars per share) | $ / shares               $ 38.95      
Aggregate Liquidation Preference               $ 1,163,671,000      
Dividend rate               10.00%      
Series C | IPO                      
Class of Stock [Line Items]                      
Temporary equity, shares outstanding (in shares) | shares               29,523,120      
Redeemable Class A Common Stock                      
Class of Stock [Line Items]                      
Temporary equity, shares outstanding (in shares) | shares 29,874,000 0 29,874,000 29,874,000 0 0 0 0 0 0 0
Reclassification of redeemable Class A common stock to Class A common stock   $ 1,163,159,000                  
Series C redeemable convertible preferred stock accretion to redemption value   0 $ 0                
Dividends payable   $ 0       $ 0          
Cash dividends paid           $ 29,000,000 $ 29,000,000        
Dividends, paid-in-kind             $ 16,000,000        
Redeemable Class A Common Stock | IPO                      
Class of Stock [Line Items]                      
Conversion of stock, shares issued (in shares) | shares 29,874,066