Class Aand Class P [Member] Annual Fund Operating Expenses - Class A and Class P - UBS Ultra Short Income Fund |
Apr. 30, 2026 |
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|---|---|---|---|---|
| Prospectus [Line Items] | ||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | August 31, 2027 | |||
| Class A | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.20% | |||
| Distribution and Service (12b-1) Fees | 0.10% | |||
| Other Expenses (as a percentage of Assets): | 0.25% | |||
| Expenses (as a percentage of Assets) | 0.55% | |||
| Fee Waiver or Reimbursement | 0.20% | [1] | ||
| Net Expenses (as a percentage of Assets) | 0.35% | [1] | ||
| Class P | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.20% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.24% | |||
| Expenses (as a percentage of Assets) | 0.44% | |||
| Fee Waiver or Reimbursement | 0.19% | [1] | ||
| Net Expenses (as a percentage of Assets) | 0.25% | [1] | ||
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