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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 03, 2024 | Jul. 25, 2024 | Jul. 23, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Subsequent Event [Line Items] |  |  |  |  |
Newly issued common LLC units |  |  |  | 80,324,378 | 79,300,658
Options granted |  |  |  | 9,097,000 |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Payment of expenses | $ 2.8 |  |  |  |
Payment of expenses remained unpaid | $ 3.9 |  |  |  |
Subsequent Event | KKR |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of outstanding common stock to be held |  | 5.00% |  |  |
Subsequent Event | Maximum | KKR |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of ownership interest |  | 40.00% |  |  |
Subsequent Event | Minimum | KKR |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage of ownership interest |  | 10.00% |  |  |
Percentage of ownership interest change in control |  | 25.00% |  |  |
Subsequent Event | OneStream, Inc | Initial Public Offering |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Net proceeds from IPO |  | $ 409.6 |  |  |
Net proceeds from LLC units |  | $ 352.9 |  |  |
Newly issued common LLC units |  | 18,723,296 |  |  |
Shares issued and outstanding LLC units |  | 3,006,037 |  |  |
Purchase of issued and outstanding LLC units |  | $ 56.7 |  |  |
Number of outstanding units issued in transaction |  |  | 8,632,763 |  |
Underwriting discounts and commissions |  | $ 25.0 |  |  |
Reclassified number of units issued in transaction |  |  | 6,591,178 |  |
Number of units held |  | 160,256,358 |  |  |
Ownership interest |  | 68.40% |  |  |
Percentage of tax savings available to pay |  | 15.00% |  |  |
Percentage of realized tax savings |  | 85.00% |  |  |
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shares issued in transaction |  | 21,729,333 |  |  |
Price per share |  | $ 0.0001 |  |  |
Public offering price |  | $ 20 |  |  |
Net proceeds from IPO |  | $ 409.6 |  |  |
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | 2024 Equity Incentive Plan [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock reserved for future issuance |  | 32,100,000 |  |  |
Options granted |  | 2,413,968 |  |  |
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | 2024 Employee Stock Purchase Plan [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock reserved for future issuance |  | 10,700,000 |  |  |
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | Existing Stockholders |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of shares issued in transaction |  | 6,445,667 |  |  |
Public offering price |  | $ 20 |  |  |

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