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Organization and Description of Business - Additional Information (Details) - OneStream Software LLC - Initial Public Offering - USD ($)
$ / shares in Units, $ in Millions
Jul. 25, 2024
Jul. 23, 2024
Class of Stock [Line Items]    
Net proceeds from IPO $ 409.6  
Purchase of issued and outstanding LLC units $ 56.7  
Shares issued and outstanding LLC units 3,006,037  
Newly issued common LLC units 18,723,296  
Net proceeds from LLC units $ 352.9  
Underwriting discounts and commissions $ 25.0  
Number of outstanding units issued in transaction   8,632,763
Reclassified number of units issued in transaction   6,591,178
Class A common stock    
Class of Stock [Line Items]    
Number of shares issued in transaction 21,729,333  
Public offering price $ 20  
Price per share $ 0.0001  
Class A common stock | Existing Stockholders    
Class of Stock [Line Items]    
Number of shares issued in transaction 6,445,667  
Class A common stock | Executive Officers and Other Employees    
Class of Stock [Line Items]    
Number of share issued upon exercise of options granted 459,230  
Class D Common Stock | Existing Stockholders    
Class of Stock [Line Items]    
Shares converted into equal number of shares 5,986,437