S000052306 [Member] Shareholder Fees - UBS Prime Reserves Fund - UBS Prime Reserves Fund |
Apr. 30, 2026 |
|---|---|
| Prospectus [Line Items] | |
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | 0.00% |
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | 0.00% |