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Stockholders' / Members' Equity - Additional Information (Details)
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Class of Stock [Line Items]    
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, par value | $ / shares $ 0.0001 $ 0.0001
Preferred stock, shares outstanding 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  
OneStream, Inc | Recapitalization of OneStream Software LLC | LLC Units    
Class of Stock [Line Items]    
Shares outstanding 6,591,178  
Class A common stock    
Class of Stock [Line Items]    
Common stock, shares authorized 2,500,000,000 2,500,000,000
Common stock, par value | $ / shares $ 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 75,209,102 51,456,091
Common stock, shares, issued 75,209,102 51,456,091
Class A common stock | LLC Units    
Class of Stock [Line Items]    
Number of units redeemed 598,404  
Class A common stock | Common Stock    
Class of Stock [Line Items]    
Shares converted into equal number of shares 21,335,418  
Shares outstanding 75,209,102 51,456,091
Class B common stock    
Class of Stock [Line Items]    
Common stock, shares authorized 300,000,000 300,000,000
Common stock, par value | $ / shares $ 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
Common stock, shares, issued 0 0
Class C Common Stock    
Class of Stock [Line Items]    
Common stock, shares authorized 300,000,000 300,000,000
Common stock, par value | $ / shares $ 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 63,331,215 63,929,619
Common stock, shares, issued 63,331,215 63,929,619
Class C Common Stock | Common Stock    
Class of Stock [Line Items]    
Shares outstanding 63,331,215 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  
Common stock, shares, issued 74,135,230  
Class D Common Stock    
Class of Stock [Line Items]    
Common stock, shares authorized 600,000,000 600,000,000
Common stock, par value | $ / shares $ 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 100,860,889 122,196,307
Common stock, shares, issued 100,860,889 122,196,307
Class D Common Stock | Common Stock    
Class of Stock [Line Items]    
Shares converted into equal number of shares (21,335,418)  
Shares outstanding 100,860,889 122,196,307
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  
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  
Incentive stock | OneStream, Inc | Recapitalization of OneStream Software LLC    
Class of Stock [Line Items]    
Shares outstanding 8,632,763