| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenues | ||||||||||||||||
| Underwriting services | — | — | ||||||||||||||
| Carried interest | — | — | ||||||||||||||
| Commissions | — | — | ||||||||||||||
| Interest income | — | — | ||||||||||||||
| Principal transactions | — | — | ||||||||||||||
| Other revenue | — | — | ||||||||||||||
| Total revenue | ||||||||||||||||
| YoY growth | -56.9% | +394.5% | +220.4% | +1157.0% | ||||||||||||
| Operating costs and expenses | ||||||||||||||||
| Compensation and benefits | — | — | ||||||||||||||
| Advisory fees | — | — | ||||||||||||||
| Legal fees | — | — | ||||||||||||||
| Professional and consulting fees | — | — | ||||||||||||||
| Other expenses | — | — | ||||||||||||||
| Total operating expenses | ||||||||||||||||
| % of revenue | 106.8% | 205.1% | 108.9% | 103.1% | ||||||||||||
| Loss from operations | ||||||||||||||||
| % of revenue | -6.8% | -105.1% | -8.9% | -3.1% | ||||||||||||
| Other income (expenses) | ||||||||||||||||
| Other income | — | — | ||||||||||||||
| Interest income | ||||||||||||||||
| Gain (loss) on marketable securities, net | ||||||||||||||||
| Realized and unrealized gain loss on notes receivable, net | — | — | — | |||||||||||||
| Change in carrying value of investments | — | — | ||||||||||||||
| Total other income (expenses) | ||||||||||||||||
| Net (loss) income before income tax expense | — | — | ||||||||||||||
| Provision for income taxes | — | — | ||||||||||||||
| Net (loss) income before non-controlling interest and deemed dividend | ||||||||||||||||
| % of revenue | -28.9% | -160.1% | -437.9% | 248.1% | ||||||||||||
| Less: Net income attributable to non-controlling interests | ||||||||||||||||
| Net (loss) income before deemed dividend | ||||||||||||||||
| % of revenue | -29.7% | -160.2% | -438.1% | 246.4% | ||||||||||||
| Net (loss) income attributable to common stockholders of Dominari Holdings Inc. | — | — | — | |||||||||||||
| Basic and Diluted (in dollars per share) |