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Label	Element	Value
UBS DYNAMIC ALPHA FUND \| UBS DYNAMIC ALPHA FUND
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	ck0000886244_SupplementTextBlock	The UBS Funds UBS Dynamic Alpha Fund Prospectus Supplement March 28, 2013 Dear Investor, The purpose of this supplement is to update the Prospectus of the UBS Dynamic Alpha Fund series (the “Fund”) of The UBS Funds dated October 29, 2012, as supplemented, as follows: 1. Effective on April 30, 2013, the total return goal of the Fund will be changed from the Consumer Price Index plus 5.00% to the Citigroup 1-Month T-Bill Index plus 2% - 4%.
Risk/Return [Heading]	rr_RiskReturnHeading	UBS DYNAMIC ALPHA FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Therefore, the last paragraph under the heading “Principal strategies” and the sub-heading “Management process” on page 5 of the Prospectus and the sixth paragraph under the heading “More information about the funds—UBS Dynamic Alpha Fund” and the sub-heading “Principal investment strategies” on page 22 of the Prospectus are deleted in their entirety and replaced by the following: In employing its investment strategies for the Fund, the Advisor attempts to achieve a total rate of return for the Fund that meets or exceeds the Citigroup 1-Month T-Bill Index plus 2% - 4% (net of management fees) over rolling five year time horizons. The Advisor does not represent or guarantee that the Fund will meet this total return goal.
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	In connection with the change to the Fund's total return goal, effective on April 30, 2013, one of the Fund's secondary benchmark indices will be changed from the US Consumer Price Index (CPI) to the Citigroup 1-Month T-Bill Index.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	2. In connection with the change to the Fund’s total return goal, effective on April 30, 2013, one of the Fund’s secondary benchmark indices will be changed from the US Consumer Price Index (CPI) to the Citigroup 1-Month T-Bill Index.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	PLEASE BE SURE TO RETAIN THIS IMPORTANT INFORMATION FOR FUTURE REFERENCE.

If the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also should show the returns of an appropriate broad-based securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____)

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