v3.26.1
Class I [Member] Annual Fund Operating Expenses - Class I - UBS Ultra Short Income Fund
Apr. 30, 2026
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination August 31, 2027
Class I  
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 0.21% [1]
Net Expenses (as a percentage of Assets) 0.23% [1]
[1]
The fund and UBS Asset Management (Americas) LLC (“UBS AM”) have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fee and/or reimburse expenses so that the fund’s ordinary total operating expenses through August 31, 2027 (excluding dividend expense, borrowing costs, and interest expense relating to short sales, and expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders’ meetings and extraordinary expenses) would not exceed 0.23% for Class I. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed this expense cap and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund’s board at any time and also will terminate automatically upon the expiration or termination of the fund’s advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM’s three year recoupment rights will survive.