v3.25.2
Stockholders' / Members' Equity - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Mar. 31, 2025
shares
Jun. 30, 2025
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Class of Stock [Line Items]        
Preferred stock, shares authorized 100,000,000   100,000,000 100,000,000
Preferred stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Preferred stock, shares outstanding 0   0 0
Recapitalization of OneStream Software LLC | LLC Units        
Class of Stock [Line Items]        
Stock outstanding ratio     1  
OneStream, Inc | Recapitalization of OneStream Software LLC        
Class of Stock [Line Items]        
Common stock, shares outstanding 80,324,378   80,324,378  
OneStream, Inc | Recapitalization of OneStream Software LLC | LLC Units        
Class of Stock [Line Items]        
Shares outstanding 6,591,178   6,591,178  
Class A common stock        
Class of Stock [Line Items]        
Common stock, shares authorized 2,500,000,000   2,500,000,000 2,500,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Common stock, voting rights     Each share of Class A common stock is entitled to one vote per share and has economic rights.  
Common stock, shares outstanding 88,017,279   88,017,279 51,456,091
Common stock, shares, issued 88,017,279   88,017,279 51,456,091
Class A common stock | LLC Units        
Class of Stock [Line Items]        
Number of units redeemed 6,834,814   7,433,218  
Class A common stock | Common Stock        
Class of Stock [Line Items]        
Shares converted into equal number of shares 2,648,807 21,335,418 23,984,225  
Shares outstanding 88,017,279 75,209,102 88,017,279 51,456,091
Class B common stock        
Class of Stock [Line Items]        
Common stock, shares authorized 300,000,000   300,000,000 300,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Common stock, voting rights     Each share of Class B common stock is entitled to one vote per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class A common stock and has no economic rights.  
Common stock, shares outstanding 0   0 0
Common stock, shares, issued 0   0 0
Class C Common Stock        
Class of Stock [Line Items]        
Common stock, shares authorized 300,000,000   300,000,000 300,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Common stock, voting rights     Each share of Class C common stock is entitled to ten votes per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class D common stock, is convertible into one share of Class B common stock and has no economic rights.  
Common stock, shares outstanding 56,496,401   56,496,401 63,929,619
Common stock, shares, issued 56,496,401   56,496,401 63,929,619
Class C Common Stock | Common Stock        
Class of Stock [Line Items]        
Shares outstanding 56,496,401 63,331,215 56,496,401 63,929,619
Class C Common Stock | Recapitalization of OneStream Software LLC        
Class of Stock [Line Items]        
Shares issued and outstanding LLC units 3,006,037   3,006,037  
Common stock, shares, issued 74,135,230   74,135,230  
Class D Common Stock        
Class of Stock [Line Items]        
Common stock, shares authorized 600,000,000   600,000,000 600,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001 $ 0.0001
Common stock, voting rights     Each share of Class D common stock is entitled to ten votes per share, is convertible into one share of Class A common stock and has economic rights.  
Common stock, shares outstanding 98,212,082   98,212,082 122,196,307
Common stock, shares, issued 98,212,082   98,212,082 122,196,307
Class D Common Stock | Common Stock        
Class of Stock [Line Items]        
Shares converted into equal number of shares (2,648,807) (21,335,418)    
Shares outstanding 98,212,082 100,860,889 98,212,082 122,196,307
Class D Common Stock | Recapitalization of OneStream Software LLC        
Class of Stock [Line Items]        
Shares converted into equal number of shares     5,986,437  
Common stock, shares, issued 132,081,358   132,081,358  
Preferred stock | Recapitalization of OneStream Software LLC | LLC Units        
Class of Stock [Line Items]        
Stock outstanding ratio     1  
Preferred stock | OneStream, Inc | Recapitalization of OneStream Software LLC        
Class of Stock [Line Items]        
Shares outstanding 128,293,508   128,293,508  
Incentive stock | OneStream, Inc | Recapitalization of OneStream Software LLC        
Class of Stock [Line Items]        
Shares outstanding 8,632,763   8,632,763