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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
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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 |

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