v3.26.3
Label Element Value
UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading UBS US Quality Growth At Reasonable Price Fund
Objective [Heading] oef_ObjectiveHeading Investment objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The Fund seeks to provide capital appreciation.

Expense Heading [Optional Text] oef_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. In addition to the fees and expenses described below, you also may be required to pay commissions or other fees to your broker for transactions in Class P shares.

Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_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 oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination Oct. 28, 2027
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_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:

Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 36% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 36.00%
Strategy [Heading] oef_StrategyHeading Principal strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock


Principal investments

To achieve its investment objective, the Fund invests in, or seeks exposure to, stocks with attractive growth, quality, and valuation profiles.

Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in US growth companies. The Fund invests primarily in stocks of companies that are believed to have substantial potential for capital growth. The Fund defines a company as a growth company if it is (i) included in an index that is representative of growth companies; (ii) classified as a growth company by an independent third party financial data provider; or (iii) considered by the advisor to exhibit characteristics of a growth company, considering metrics such as historical and/or projected growth rates relative to the applicable equity market.

The Advisor considers a number of factors to determine whether an investment is tied to the United States, including whether the issuer is listed in the United States, the issuer is organized in the United States, the issuer derives at least 50% of its revenues in the United States, the issuer has at least 50% of its assets in the United States, the investment is included in an index representative of the United States, and the investment is exposed to the economic fortunes and risks of the United States.

Under normal circumstances, the Fund invests a substantial portion of its net assets in large-capitalization equities traded in the United States. Investments in equity securities may include but are not limited to common stock (including REITs) of issuers located throughout the world, and American Depositary Receipts. The Fund may invest in issuers from both developed markets (including the United States) and emerging markets.

Under normal market conditions, the Advisor intends to invest the Fund’s portfolio under the following guidelines, but reserves the right to deviate if economic and business conditions warrant:

•

20‑50 stocks in the portfolio

•

Companies with a market capitalization of $2.5 billion or greater

•

Typical allocation to American Depository Receipts (ADRs) of 15% or less

•

Minimum of 6 sectors included in the portfolio for diversification purposes

•

The Fund aims to be fully invested but may allow for a cash allocation—with a range of 0.50‑10% of net assets—for liquidity purposes.

The Fund is a non-diversified fund, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company.

Under certain market conditions, the Fund may, but is not required to, use exchange traded derivative instruments for risk management purposes or as part of the Fund’s investment strategies. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate, index or other market factor and may relate to stocks, bonds, interest rates, credit, currencies or currency exchange rates, commodities and related indices. The derivatives in which the Fund may invest include futures, forward currency agreements and equity participation notes. All of these derivatives may be used for risk management purposes to manage or adjust the risk profile of the Fund. Futures on currencies and forward currency agreements may also be used to hedge against a specific currency. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments (except for forward currency agreements); or to obtain exposure to certain markets (except for forward currency agreements). The Fund also may use futures contracts on equity securities and indices to gain market exposure on its uninvested cash. Derivative instruments that provide investment exposure to investments in the Fund’s 80% investment policy or provide investment exposure to one or more of the market risk factors associated with such securities may be counted towards the Fund’s 80% investment policy.

The Fund also may at times invest in ETFs and other investment companies for the purpose of gaining exposure to the stock market while maintaining liquidity.

In pursuing its investment strategy, depending upon market and economic conditions, the Fund may have a significant degree of investments in securities of issuers within a single sector or industry, including the information technology sector and semiconductor industry.

Management process

The Advisor seeks to invest in high quality companies, expected to deliver above-average earnings per share (EPS) growth over the next 3‑5 years, trading at attractive valuations. The Advisor believes that investment risks inherent in investing in higher growth-oriented stocks can be mitigated by focusing on both higher quality companies and being disciplined regarding valuations. Using this approach, the Advisor believes the portfolio can deliver attractive risk-adjusted total returns through the market cycle when compared to US large-cap growth indices.

The portfolio management team defines “reasonable price” as attractive valuation relative to the broader growth index (Russell 1000 Growth Index). While the primary metric used to assess valuation is price-to-earnings, the team may include other metrics such as enterprise value-to-earnings before interest, taxes, depreciation and amortization (“EBITDA”) and price-to-sales.

In selecting individual securities for investment, the Advisor begins with a proprietary quantitative model. The investable universe of stocks are scored using the following metrics:

•

High-quality as defined by margin stability over a business cycle and return on equity.

•

Expected earnings growth over the next 3‑5 years

•

Valuation relative to the broader growth index (Russell 1000 Growth Index).

The Advisor may modify the quantitative screening process at any time, without shareholder approval or notice.

Stocks are then reviewed from a “bottom-up” or fundamental perspective by the Advisor, leveraging the intellectual capital of UBS Global Wealth Management (“WM”), an affiliate of the Advisor, Chief Investment Office (“CIO”) equity strategists and equity sector analysts, as well as other resources. The Advisor assesses the fundamental outlook for revenues, earnings, quality, and valuation—among other metrics—while determining potential upside and downside risks given current and expected market environments. This assessment is determined with the intention of owning stocks for the portfolio over a multi-year time horizon.

In addition, the Advisor constructs the portfolio taking into account several investment considerations including but not limited to: the UBS House View (a publication of macro and thematic views of WM CIO) on markets, regions, sectors and style factors. While the Advisor may receive input from multiple business units within UBS, the Advisor has final discretion in the portfolio’s construction.

The Fund’s investment process integrates material sustainability and/or environmental, social and governance (“ESG”) considerations into the research process for portfolio investments and portfolio holdings for which ESG data is available. Therefore, the Advisor does not assess every investment for ESG factors and, when it does, not every ESG factor may be identified or evaluated. ESG integration is driven by taking into account material sustainability and/or ESG risks which could impact investment returns, rather than being driven by

specific ethical principles or norms. The analysis of material sustainability and/or ESG considerations can include many different aspects, including, for example, the carbon footprint, employee health and well-being, supply chain management, fair customer treatment and governance processes of a company. This analysis is captured in a qualitative ESG assessment by the Advisor that leverages internal research. The Advisor also accesses quantitative ESG data that combines multiple sources and provides information on ESG risks and opportunities. ESG considerations and weights considered may change over time. The Fund’s portfolio managers may still invest in securities without respect to sustainability and/or ESG considerations or in securities which present sustainability and/or ESG risks, including where the portfolio managers believe the potential compensation outweighs the risks identified.

Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block] fnd_NmRule35d1TermDfnSmryTextBlock The Fund invests primarily in stocks of companies that are believed to have substantial potential for capital growth. The Fund defines a company as a growth company if it is (i) included in an index that is representative of growth companies; (ii) classified as a growth company by an independent third party financial data provider; or (iii) considered by the advisor to exhibit characteristics of a growth company, considering metrics such as historical and/or projected growth rates relative to the applicable equity market. The Advisor considers a number of factors to determine whether an investment is tied to the United States, including whether the issuer is listed in the United States, the issuer is organized in the United States, the issuer derives at least 50% of its revenues in the United States, the issuer has at least 50% of its assets in the United States, the investment is included in an index representative of the United States, and the investment is exposed to the economic fortunes and risks of the United States. The Advisor considers a number of factors to determine whether an investment is tied to the United States, including whether the issuer is listed in the United States, the issuer is organized in the United States, the issuer derives at least 50% of its revenues in the United States, the issuer has at least 50% of its assets in the United States, the investment is included in an index representative of the United States, and the investment is exposed to the economic fortunes and risks of the United States.
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block] fnd_NmRule35d1TermSlctnCritSmryTextBlock The Fund invests primarily in stocks of companies that are believed to have substantial potential for capital growth. The Fund defines a company as a growth company if it is (i) included in an index that is representative of growth companies; (ii) classified as a growth company by an independent third party financial data provider; or (iii) considered by the advisor to exhibit characteristics of a growth company, considering metrics such as historical and/or projected growth rates relative to the applicable equity market. The Advisor considers a number of factors to determine whether an investment is tied to the United States, including whether the issuer is listed in the United States, the issuer is organized in the United States, the issuer derives at least 50% of its revenues in the United States, the issuer has at least 50% of its assets in the United States, the investment is included in an index representative of the United States, and the investment is exposed to the economic fortunes and risks of the United States. Derivative instruments that provide investment exposure to investments in the Fund’s 80% investment policy or provide investment exposure to one or more of the market risk factors associated with such securities may be counted towards the Fund’s 80% investment policy.
Rule 35d-1 Eighty Percent Investment Policy [Text Block] fnd_NmRule35d1EightyPctInvstmntPlcyTextBlock Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in US growth companies.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

Risk/return bar chart and table

The performance information that follows shows the Fund’s performance information in a bar chart and an average annual total returns table. The information provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance. The table also shows the Russell 1000 Growth Index, which is an additional index with characteristics relevant to the Fund. The indices reflect no deduction for fees, expenses or taxes. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance for the Fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.

Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The information provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance.
Performance Additional Market Index [Text] oef_PerformanceAdditionalMarketIndex The table also shows the Russell 1000 Growth Index, which is an additional index with characteristics relevant to the Fund.
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Total return (Class P)*
Bar Chart Footnotes [Text Block] oef_BarChartFootnotesTextBlock

* 2021 is the Fund’s first full calendar year of operations.

Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock

Total return January 1—September 30, 2026: 5.02%

Best quarter during calendar years shown—2Q 2025: 16.28%

Worst quarter during calendar years shown—2Q 2022: (17.91)%

Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Sep. 30, 2026
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 5.02%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2025
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 16.28%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (17.91%)
Performance Table Heading oef_PerformanceTableHeading Average annual total returns (for the periods ended December 31, 2025)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes The indices reflect no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate oef_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred oef_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Risk Lose Money [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock You may lose money by investing in the Fund.
UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Equity risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. The value of these securities may decline due to general market conditions, not specific to a particular company or industry. The Fund could lose all of its investment in a company’s stock.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Market risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Market risk: The risk that the market value of the Fund’s investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Investment style risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Investment style risk: The risk that returns from large capitalization growth stocks will produce lower returns than the overall stock market. Growth stocks tend to go through cycles of doing better—or worse—than other segments of the stock market, such as value stocks, or the stock market in general.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Focus risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Focus risk: To the extent the Fund’s investment strategy leads to sizable allocations to a particular market, sector or industry, the Fund may be more sensitive to any single economic, business, political, regulatory, or other event that occurs in that market, sector or industry than another fund having a broader range of investments. As a result, there may be more fluctuation in the price of the Fund’s shares.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Information technology sector risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Information technology sector risk: The Fund’s performance may be particularly affected by developments affecting the information technology sector as a result of significant investments in such sector. Information technology companies may face rapid technological change, short product cycles, intense competition, changing customer preferences, and substantial research and development costs. A company’s products or services may become obsolete or fail to gain market acceptance, and its financial results may depend on a limited number of products, customers, or key personnel. These companies may also be adversely affected by cybersecurity incidents, service disruptions, data-privacy requirements, changes in government regulation, and the failure to obtain (or delays in obtaining) financing or regulatory approvals. Companies in the information technology sector are heavily dependent on patent and intellectual property rights. The loss or impairment of these rights and disputes over intellectual property rights may adversely affect the profitability of these companies.

The Fund’s performance may also be particularly affected by developments affecting the semiconductor industry as a result of significant investments in such industry. Semiconductor companies may be particularly sensitive to fluctuations in demand and competitive pressures, rapid changes in technology, high capital expenditures, manufacturing defects, and disruptions in complex global supply chains. Their operations may also be affected by limited availability of specialized materials or manufacturing capacity and by trade restrictions, tariffs, or export controls.

The market prices of information technology securities, including semiconductor companies, may be especially volatile, and adverse developments affecting the information technology sector and semiconductor industry could cause the Fund’s shares to decline in value.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Risk Nondiversified Status [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund’s share price may be more volatile, and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Model and data risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Model and data risk: The Advisor may employ a complex strategy using proprietary quantitative models in selecting investments for the Fund. Investments selected using these models may perform differently than expected as a result of the factors used in the models, the weight placed on each factor, changes from the factors’ historical trends, and technical issues in the construction and implementation of the models (including, for example, data problems, problems with data supplied by third parties, software issues, or other types

of errors). There is no guarantee that the Advisor’s quantitative models will perform as expected or result in effective investment decisions for the Fund.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Foreign investing risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Foreign investing risk: The value of the Fund’s investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Management risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.

Consequently, the Fund may underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Real estate securities and REITs risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Real estate securities and REITs risk: The risk that the Fund’s performance will be affected by adverse developments in the real estate industry. Real estate values may be affected by a variety of factors, including: local, national or global economic conditions; changes in zoning or other property-related laws; environmental regulations; interest rates; tax and insurance considerations; overbuilding; property taxes and operating expenses; or declining values in a neighborhood. The performance of REITs depends on how well each REIT manages its properties. Equity REITs, which invest directly in real estate properties and property developers, may be affected by any changes in the value of the underlying property owned by the trusts. REITs expose investors in the Fund to the risks of owning real estate directly, including fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. In addition, a REIT may be more susceptible to adverse developments affecting a single project or market segment than a more diversified investment. Loss of status as a qualified REIT under the US federal tax laws could adversely affect the value of a particular REIT or the market for REITs as a whole.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Small- and mid-capitalization risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Small- and mid-capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the Fund’s ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments, and they may have more limited resources.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Emerging market risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Emerging market risk: There are additional risks inherent in investing in less developed countries that are

applicable to the Fund. Compared to the United States and other developed countries, investments in emerging market issuers may decline in value because of unfavorable foreign government actions (such as expropriation or nationalization), greater risks of political and civil instability, or the absence of accurate information about emerging market issuers. Further, emerging countries may have economies based on only a few industries and securities markets that trade only a small number of securities and employ settlement procedures different from those used in the United States. Prices on these exchanges tend to be volatile and, in the past, securities in these countries have offered greater potential for gain (as well as loss) than securities of companies located in developed countries. Issuers may not be subject to uniform accounting, auditing and financial reporting standards and there may be less publicly available financial and other information about such issuers, comparable to US issuers. Further, investments by foreign investors are subject to a variety of restrictions in many emerging countries. Countries such as those in which the Fund may invest may experience high transaction costs, possible foreign controls on investment, less stringent investor protections, high rates of inflation or deflation, high interest rates, exchange rate fluctuations or currency depreciation, large amounts of external debt, balance of payments and trade difficulties and extreme poverty and unemployment. Additionally, the Fund may have substantial difficulties exercising its legal rights or enforcing a counterparty’s or issuer’s legal obligations in certain jurisdictions outside of the United States, and it may be more difficult for investors or for US regulators to bring litigation or enforcement actions against such issuers, which can increase the risks of loss.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Leverage risk associated with financial instruments [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives used for investment (non-hedging) purposes, may cause the Fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the Fund that exceed the amount originally invested. Even small changes in the value of underlying instruments can have a disproportionately large impact on the Fund.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Derivatives risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Derivatives risk: The value of “derivatives”—so called because their value “derives” from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the Fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the Fund’s overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the Fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of

investing in derivative instruments also include market, leverage, operational, legal, and management risks. In addition, non-exchange traded derivatives may be subject to liquidity risk, counterparty risk (which is the risk that a counterparty to a derivative contract is unable or unwilling to meet its financial obligations), credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Investing in other funds risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Investing in other funds risk: Investments in open- or closed-end investment companies, including ETFs, involve certain risks. The Fund’s investment performance is affected by the investment performance of the underlying funds in which the Fund may invest. Through its investment in the underlying funds, the Fund is subject to the risks of the underlying funds’ investments and their expenses. The shares of other investment companies are subject to the management fees and other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads. In addition, ETFs or closed-end investment companies may trade at a premium or a discount to their net asset value.

UBS US Quality Growth At Reasonable Price Fund | UBS US Quality Growth At Reasonable Price Fund | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.25% [1]
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.75%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.10%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 407
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 921
UBS US Quality Growth At Reasonable Price Fund | Russell 1000 Growth Index  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Percent oef_AvgAnnlRtrPct 18.70%
Average Annual Return, Percent oef_AvgAnnlRtrPct 15.35%
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.79%
UBS US Quality Growth At Reasonable Price Fund | S&P 500 Index  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.88%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.42%
Average Annual Return, Percent oef_AvgAnnlRtrPct 16.93%
UBS US Quality Growth At Reasonable Price Fund | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct 29.19%
Annual Return [Percent] oef_AnnlRtrPct (25.56%)
Annual Return [Percent] oef_AnnlRtrPct 35.51%
Annual Return [Percent] oef_AnnlRtrPct 25.15%
Annual Return [Percent] oef_AnnlRtrPct 15.63%
Average Annual Return, Percent oef_AvgAnnlRtrPct 15.63%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.53%
Average Annual Return, Percent oef_AvgAnnlRtrPct 15.11%
Performance Inception Date oef_PerfInceptionDate Jul. 09, 2020
UBS US Quality Growth At Reasonable Price Fund | Class P | After Taxes on Distributions  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.98%
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.68%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.30%
UBS US Quality Growth At Reasonable Price Fund | Class P | After Taxes on Distributions and Sales  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.36%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.66%
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.05%
[1] “Other expenses” include “Acquired fund fees and expenses,” which were less than 0.01% of the average net assets of the Fund.
[2] The Trust, with respect to the Fund, and UBS Asset Management (Americas) LLC, the Fund’s investment advisor and administrator (“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, dividend expense and security loan fees for securities sold short, and extraordinary expenses, such as proxy-related 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, dividend expense and security loan fees for securities sold short, and extraordinary expenses, such as proxy-related expenses), through the period ending October 28, 2027, do not exceed 0.65% for Class P shares. Pursuant to the written agreement, the Advisor is