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UBS U.S. Large Cap Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000886244_SupplementTextBlock
The UBS Funds
Prospectus Supplement

The UBS Funds

UBS U.S. Large Cap Equity Fund

Prospectus Supplement

March 23, 2016

Dear Investor,

The purpose of this supplement to the Prospectus of the UBS U.S. Large Cap Equity Fund series (the "Fund") of The UBS Funds (the "Trust") dated October 28, 2015, as supplemented, is to notify you that on March 3, 2016, the Board of Trustees of the Trust approved a new expense limitation agreement for the Fund.  The new expense limitation agreement decreases the expense caps by 25 basis points for each class of the Fund and extends the period of the agreement from October 27, 2016 to October 27, 2017.

Therefore, on pages 7-8 of the Prospectus, the Fund’s Shareholder fees, Annual fund operating expenses, and Example tables are deleted in their entirety and replaced with the following:
Risk/Return [Heading] rr_RiskReturnHeading UBS U.S. Large Cap Equity Fund
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Oct. 27, 2017
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The “Less management fee waiver/expense reimbursements” and “Total annual fund operating expenses after management fee waiver/expense reimbursements” are restated to reflect a change in the Fund’s expense limitation agreement.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The costs described in the example reflect the expenses of the Fund that would result from the contractual fee waiver and expense reimbursement agreement with the Advisor for the first year only. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock
PLEASE BE SURE TO RETAIN THIS IMPORTANT INFORMATION FOR FUTURE REFERENCE.
UBS U.S. Large Cap Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.61% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.56%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.61%) [3]
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 0.95% [3],[4]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 642
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 959
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,298
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,255
UBS U.S. Large Cap Equity Fund | CLASS C  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.61% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.61%) [3]
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 1.70% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 273
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 663
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,599
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 173
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 663
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,599
UBS U.S. Large Cap Equity Fund | CLASS P  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.37% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.07%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.37%) [3]
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 0.70% [3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 304
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 556
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,276
[1] Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.
[3] The "Less management fee waiver/expense reimbursements" and "Total annual fund operating expenses after management fee waiver/expense reimbursements" are restated to reflect a change in the Fund's expense limitation agreement.
[4] Effective March 23, 2016, the Trust, with respect to the Fund, and UBS Asset Management (Americas) Inc. (formerly, UBS Global Asset Management (Americas) Inc.), the Fund's investment advisor ("UBS AM (Americas)" or the "Advisor"), have entered into a written agreement pursuant to which the Advisor has agreed to waive a portion of its management fees and/or to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses), through the period ending October 27, 2017, do not exceed 0.95% for Class A shares, 1.70% for Class C shares and 0.70% for Class P shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses for a period of three years following such fee waivers and expense reimbursements to the extent that such reimbursement of the Advisor by the Fund will not cause the Fund to exceed any applicable expense limit that is in place for the Fund. The fee waiver/expense reimbursement agreement may be terminated by the Fund's Board of Trustees at any time and also will terminate automatically upon the expiration or termination of the Fund's advisory contract with the Advisor. Upon termination of the fee waiver/expense reimbursement agreement, however, the UBS AM (Americas)'s three year recoupment rights will survive.