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Stockholders’ Equity - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 06, 2025
Aug. 01, 2025
USD ($)
$ / shares
shares
Jul. 30, 2025
USD ($)
Jun. 26, 2025
shares
Jun. 30, 2025
shares
Aug. 31, 2024
$ / shares
shares
Jul. 03, 2024
USD ($)
$ / shares
shares
May 31, 2024
USD ($)
grantee
shares
Oct. 31, 2021
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
vote
day
performance_period
$ / shares
shares
Sep. 30, 2024
USD ($)
Jul. 31, 2025
plan
Feb. 13, 2025
shares
Dec. 31, 2024
$ / shares
shares
Class of Stock [Line Items]                                
Preferred stock, shares authorized (in shares)   200,000,000.0                            
Preferred stock, par value (in usd per share) | $ / shares   $ 0.00001                            
Preferred stock, shares issued (in shares)                   0   0        
Preferred stock, shares outstanding (in shares)                   0   0        
Common stock, par value (in dollar per share) | $ / shares                   $ 0.00001   $ 0.00001       $ 0.00001
Dividends declared | $                       $ 0        
Number of equity incentive plans | plan                           2    
Common stock reserved for issuance (in shares)                   185,982,000   185,982,000       347,098,000
Performance vesting condition, period after IPO     6 months                          
Taxes withheld upon release of restricted stock units | $                   $ 494,649,000   $ 494,649,000 $ 419,032,000      
Issuance of common stock to investors upon closing of RSU release primary financing (in shares)                       385,405,000        
Proceeds from sale of common stock in connection with May 2024 RSU release primary financing | $                       $ 0 418,968,000      
Taxes paid related to net share settlement of equity awards | $                       $ 494,649,000 418,051,000      
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit                                
Class of Stock [Line Items]                                
Amount drawn on line of credit | $     $ 330,500,000                          
2025 Plan                                
Class of Stock [Line Items]                                
Maximum automatic annual increase of shares reserved for issuance, percentage of aggregate number of outstanding shares of common stock       5.00%                        
Shares available for grant (in shares)                   74,200,000   74,200,000        
2025 Employee Stock Purchase Plan                                
Class of Stock [Line Items]                                
Maximum automatic annual increase of shares reserved for issuance, percentage of aggregate number of outstanding shares of common stock       1.00%                        
Maximum number of shares for each employee under ESPP                       2,500        
Maximum value of shares for each employee under ESPP | $                       $ 25,000        
Offering period   6 months                            
Dividend yield                       0.00%        
Stock-based compensation expense | $                   $ 25,600,000   $ 25,600,000        
Total unrecognized stock-based compensation | $                   $ 24,500,000   $ 24,500,000        
Period for recognition (in years)                       1 month 6 days        
Taxes paid related to net share settlement of equity awards | $                       $ 17,200,000        
2024 Stock Option Grants                                
Class of Stock [Line Items]                                
Stock-based compensation expense | $                     $ 88,119,000          
Granted (in shares)           10,500,000                    
Grant date fair value (in dollar per share) | $ / shares           $ 8.50                    
2024 Stock Option Grants | Minimum                                
Class of Stock [Line Items]                                
Expiration period           1 year                    
2024 Stock Option Grants | Maximum                                
Class of Stock [Line Items]                                
Expiration period           5 years                    
Stock options                                
Class of Stock [Line Items]                                
Common stock reserved for issuance (in shares)                   21,289,000   21,289,000       24,023,000
Stock options | 2025 Plan                                
Class of Stock [Line Items]                                
Expiration period                       10 years        
Cliff vesting period                       1 year        
Requisite service period                       4 years        
RSUs                                
Class of Stock [Line Items]                                
Common stock reserved for issuance (in shares)                   90,531,000   90,531,000       73,951,000
Stock-based compensation expense | $               $ 801,200,000                
Total unrecognized stock-based compensation | $                   $ 951,600,000   $ 951,600,000        
Outstanding shares met service condition (in shares)               34,600,000                
Number of grantees affected by modification | grantee               1,486                
Share-based payment arrangement, shares withheld (in shares)                       18,100,000        
Restricted Stock Units (RSUs), Performance-Based Vesting Conditions                                
Class of Stock [Line Items]                                
Stock-based compensation expense | $   $ 975,700,000                            
Restricted Stock Units (RSUs), Excluding 2021 CEO Market Award And 2021 CEO Service Award | Pro Forma                                
Class of Stock [Line Items]                                
Period for recognition (in years)                       3 years 4 months 24 days        
Restricted Stock Units (RSUs), 2021 CEO Market Award                                
Class of Stock [Line Items]                                
Stock-based compensation expense | $                   $ 72,200,000            
Maximum performance periods for tranches | performance_period                       7        
Number of trading days period | day                       30        
Outstanding beginning balance (in dollar per share) | $ / shares                   $ 6.42   $ 6.42        
Lock up period vesting rights, percentage 50.00%                              
Number of calendar days after expiration of lock-up period                       10 years        
Remaining vesting rights, percentage 50.00%                              
Number of calendar days 91 days                              
Restricted Stock Units (RSUs), 2021 CEO Market Award | Tranche 1                                
Class of Stock [Line Items]                                
Award vesting rights, percentage 50.00%                              
Restricted Stock Units (RSUs), 2021 CEO Market Award | Tranche 2                                
Class of Stock [Line Items]                                
Award vesting rights, percentage 50.00%                              
Restricted Stock Units (RSUs), 2021 CEO Service Award                                
Class of Stock [Line Items]                                
Stock-based compensation expense | $               $ 78,300,000   $ 84,100,000            
Unrecognized stock-based compensation | $                   0   $ 0        
Nonvested award, excluding options (in shares)                       7,900,000        
Restricted Stock Units (RSUs), 2025 CEO Stock Price Award                                
Class of Stock [Line Items]                                
Award vesting period                       7 years        
Stock-based compensation expense | $                   $ 24,900,000   $ 24,900,000        
Period for recognition (in years)                       4 years 1 month 6 days        
Number of trading days period | day                       60        
Outstanding beginning balance (in dollar per share) | $ / shares                   $ 27.45   $ 27.45        
Unrecognized stock-based compensation | $                   $ 372,600,000   $ 372,600,000        
Restricted Stock Units (RSUs), 2025 CEO Service Award                                
Class of Stock [Line Items]                                
Stock-based compensation expense | $                   23,500,000   $ 23,700,000        
Period for recognition (in years)                       4 years 8 months 12 days        
Unrecognized stock-based compensation | $                   $ 440,600,000   $ 440,600,000        
Number of calendar days                       60 days        
Convertible preferred stock                                
Class of Stock [Line Items]                                
Preferred stock, shares authorized (in shares)                   0   0       247,861,000
Preferred stock, par value (in usd per share) | $ / shares                   $ 0.00001   $ 0.00001       $ 0.00001
Preferred stock, shares issued (in shares)                   0   0       245,999,000
Preferred stock, shares outstanding (in shares)                   0   0       245,999,000
Convertible preferred stock | 2024 Tender Offer | Investors, Employees, And Former Employees | New and Existing Investors                                
Class of Stock [Line Items]                                
Shares purchased (in shares)             1,800,000                  
Blockchain                                
Class of Stock [Line Items]                                
Common stock, shares authorized (in shares)   100,000,000.0               100,000,000   100,000,000       0
Common stock, par value (in dollar per share) | $ / shares   $ 0.00001               $ 0.00001   $ 0.00001       $ 0.00001
Common stock, shares outstanding (in shares)                   0   0       0
Common stock, shares issued (in shares)                   0   0       0
Common Class A                                
Class of Stock [Line Items]                                
Converted preferred stock (in shares)   246,000,000.0                            
Common stock, shares authorized (in shares)                   10,000,000,000   10,000,000,000       571,000,000
Common stock, par value (in dollar per share) | $ / shares                   $ 0.00001   $ 0.00001       $ 0.00001
Common stock, shares outstanding (in shares)                   412,977,000   412,977,000       124,159,000
Common stock, shares issued (in shares)                   412,977,000   412,977,000       124,159,000
Number of voting rights per share | vote                       1        
Issuance of common stock to investors upon closing of RSU release primary financing (in shares)                       18,100,000        
Proceeds from sale of common stock in connection with May 2024 RSU release primary financing | $                       $ 419,000,000        
Purchase price (in dollar per share) | $ / shares                   $ 23.19   $ 23.19        
Common Class A | Over-Allotment Option | Selling Stockholders                                
Class of Stock [Line Items]                                
Purchase price (in dollars per share) | $ / shares   $ 33.00                            
Fair value of common stock on grant date (in dollars per share) | $ / shares   $ 79.42                            
Shares purchased (in shares)   5,500,000                            
Common Class A | IPO                                
Class of Stock [Line Items]                                
Purchase price (in dollars per share) | $ / shares   $ 33.00                            
Shares purchased (in shares)   12,500,000                            
Shares issued (in shares)   9,600,000                            
Taxes withheld upon release of restricted stock units | $   $ 411,400,000                            
Aggregate purchase price | $   $ 393,100,000                            
Common Class A | IPO | Selling Stockholders                                
Class of Stock [Line Items]                                
Shares purchased (in shares)   30,000,000.0                            
Common Class A | 2024 Tender Offer                                
Class of Stock [Line Items]                                
Incremental stock-based compensation expense | $                         $ 56,600,000      
Common Class A | 2024 Tender Offer | Investors, Employees, And Former Employees | New and Existing Investors                                
Class of Stock [Line Items]                                
Purchase price (in dollars per share) | $ / shares             $ 23.19                  
Shares purchased (in shares)             24,400,000                  
Aggregate purchase price | $             $ 566,700,000                  
Preferred stock, convertible, conversion ratio             1                  
Common Class A | 2025 Plan                                
Class of Stock [Line Items]                                
Common stock reserved for issuance (in shares)   58,000,000.0                            
Common Class A | 2025 Employee Stock Purchase Plan                                
Class of Stock [Line Items]                                
Common stock reserved for issuance (in shares)                             11,600,000  
Percentage of shares of Class B common stock vested       85.00%                        
Number of shares authorized for grant (in shares)       100,000,000.0                        
Repurchase of shares                       0        
Common Class A | Unvested RSAs                                
Class of Stock [Line Items]                                
Outstanding shares (in shares)                   700,000   700,000       100,000
Common Class B                                
Class of Stock [Line Items]                                
Common stock, shares authorized (in shares)                   350,000,000   350,000,000       118,956,000
Common stock, par value (in dollar per share) | $ / shares                   $ 0.00001   $ 0.00001       $ 0.00001
Common stock, shares outstanding (in shares)                   79,682,000   79,682,000       90,747,000
Common stock, shares issued (in shares)                   79,682,000   79,682,000       90,747,000
Number of voting rights per share | vote                       15        
Common Class B | IPO                                
Class of Stock [Line Items]                                
Shares issued (in shares)   3,900,000                            
Common Class B | Restricted Stock Units (RSUs), 2021 CEO Market Award                                
Class of Stock [Line Items]                                
Outstanding shares met service condition (in shares)                       11,250,000        
Number of shares granted (in shares)                 11,300,000              
Common Class B | Restricted Stock Units (RSUs), 2021 CEO Market Award | Tranche 1                                
Class of Stock [Line Items]                                
Outstanding shares met service condition (in shares)                       1,875,000        
Common Class B | Restricted Stock Units (RSUs), 2021 CEO Market Award | Tranche 2                                
Class of Stock [Line Items]                                
Outstanding shares met service condition (in shares)                       3,750,000        
Common Class B | Restricted Stock Units (RSUs), 2021 CEO Market Award | Tranche 3                                
Class of Stock [Line Items]                                
Outstanding shares met service condition (in shares)                       5,625,000        
Common Class B | Restricted Stock Units (RSUs), 2021 CEO Service Award                                
Class of Stock [Line Items]                                
Outstanding shares met service condition (in shares)                 11,300,000              
Number of shares granted (in shares)                 11,300,000              
Shares modified and released (in shares)               3,400,000                
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award                                
Class of Stock [Line Items]                                
Number of shares granted (in shares)                       14,500,000        
Award vesting rights, percentage                       100.00%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award | Tranche 1                                
Class of Stock [Line Items]                                
Award vesting rights, percentage                       15.00%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award | Tranche 2                                
Class of Stock [Line Items]                                
Award vesting rights, percentage                       15.00%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award | Tranche 3                                
Class of Stock [Line Items]                                
Award vesting rights, percentage                       15.00%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award | Tranche 4                                
Class of Stock [Line Items]                                
Award vesting rights, percentage                       15.00%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Stock Price Award | Tranche 5                                
Class of Stock [Line Items]                                
Award vesting rights, percentage                       14.50%        
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award                                
Class of Stock [Line Items]                                
Number of shares granted (in shares)         14,500,000                      
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award | Tranche 1                                
Class of Stock [Line Items]                                
Award vesting rights, percentage         10.00%                      
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award | Tranche 2                                
Class of Stock [Line Items]                                
Award vesting rights, percentage         20.00%                      
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award | Tranche 3                                
Class of Stock [Line Items]                                
Award vesting rights, percentage         20.00%                      
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award | Tranche 4                                
Class of Stock [Line Items]                                
Award vesting rights, percentage         20.00%                      
Common Class B | Restricted Stock Units (RSUs), 2025 CEO Service Award | Tranche 5                                
Class of Stock [Line Items]                                
Award vesting rights, percentage         30.00%                      
Common Class C                                
Class of Stock [Line Items]                                
Common stock, shares authorized (in shares)                   1,000,000,000   1,000,000,000       0
Common stock, par value (in dollar per share) | $ / shares                   $ 0.00001   $ 0.00001       $ 0.00001
Common stock, shares outstanding (in shares)                   0   0       0
Common stock, shares issued (in shares)                   0   0       0
Number of voting rights per share | vote                       0