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Brown Advisory Growth Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Growth Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Growth Equity Fund (the “Fund”) seeks to achieve capital appreciation by primarily investing in equity securities.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 25% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of domestic companies.  The Fund invests primarily in securities of medium and large market capitalization companies that the Adviser believes have exhibited an above average rate of earnings growth and that have prospects for above average, sustainable growth in the future.  Medium and large market capitalization companies are, according to the Adviser, those companies with market capitalizations generally greater than $2 billion at the time of purchase.  The Fund may also invest in companies that do not exhibit particularly strong earnings histories but have other attributes that may contribute to accelerated growth in the foreseeable future.  Equity securities include domestic common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”).  The Fund may also invest in private placements in these types of securities.  The Fund invests primarily in ETFs that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.  The Fund may invest up to 15% of its net assets in foreign securities, including in emerging markets.

The Adviser may sell a security or reduce its position if:
•The investment thesis is violated;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the long-term expectation.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their
market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Growth Company Risk. Securities of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Medium Capitalization Company Risk. Securities of medium sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of medium-sized companies may decline more in response to selling pressures.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks
associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares, Advisor Shares and Institutional Shares for 1, 5 and 10 year periods compare to the Fund's primary broad-based market index and a secondary index provided to offer a broader market perspective.

The Fund is the successor to the investment performance of the Brown Advisory Growth Equity Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/growth-equity-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Growth Equity Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 12.85%. During the periods shown in the chart, the highest quarterly return was 26.56% (for the quarter ended June 30, 2020) and the lowest quarterly return was -16.14% (for the quarter ended September 30, 2011).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 12.85%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.14%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Growth Equity Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock NOTE: The Growth Equity Fund offers three classes of Shares. Investor Shares commenced operations on June 28, 1999 as part of the Predecessor Fund, Advisor Shares commenced operations on May 18, 2006 as part of the Predecessor Fund, and Institutional Shares commenced operations on October 19, 2012. Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. Prior to July 1, 2011, the Advisor Shares were known as A Shares. Prior to October 19, 2012, Investor Shares were known as Institutional Shares.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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Growth Equity Fund | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000® Growth Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 38.49%
5 Years rr_AverageAnnualReturnYear05 21.00%
10 Years rr_AverageAnnualReturnYear10 17.21%
Brown Advisory Growth Equity Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
10 Years rr_AverageAnnualReturnYear10 13.88%
Brown Advisory Growth Equity Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.57%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.59%
5 Years rr_AverageAnnualReturnYear05 20.00%
10 Years rr_AverageAnnualReturnYear10 15.46%
Brown Advisory Growth Equity Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.57%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,014
Annual Return 2011 rr_AnnualReturn2011 (0.31%)
Annual Return 2012 rr_AnnualReturn2012 15.43%
Annual Return 2013 rr_AnnualReturn2013 28.63%
Annual Return 2014 rr_AnnualReturn2014 6.18%
Annual Return 2015 rr_AnnualReturn2015 6.88%
Annual Return 2016 rr_AnnualReturn2016 (3.02%)
Annual Return 2017 rr_AnnualReturn2017 30.43%
Annual Return 2018 rr_AnnualReturn2018 5.01%
Annual Return 2019 rr_AnnualReturn2019 40.48%
Annual Return 2020 rr_AnnualReturn2020 32.37%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.37%
5 Years rr_AverageAnnualReturnYear05 19.82%
10 Years rr_AverageAnnualReturnYear10 15.29%
Brown Advisory Growth Equity Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 30.79%
5 Years rr_AverageAnnualReturnYear05 17.73%
10 Years rr_AverageAnnualReturnYear10 14.00%
Brown Advisory Growth Equity Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 20.14%
5 Years rr_AverageAnnualReturnYear05 15.47%
10 Years rr_AverageAnnualReturnYear10 12.48%
Brown Advisory Growth Equity Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAGAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.57%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 340
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 590
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,306
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.02%
5 Years rr_AverageAnnualReturnYear05 19.52%
10 Years rr_AverageAnnualReturnYear10 15.00%
Brown Advisory Flexible Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Flexible Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Flexible Equity Fund (the “Fund”) seeks to achieve long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 13% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of equity securities. The Fund invests primarily in securities of medium and large market capitalization companies that the Adviser believes have strong, or improving, long-term business characteristics and share prices that do not reflect these favorable fundamental attributes. Medium and large market capitalization companies are, according to the Adviser, those companies with market capitalizations generally greater than $2 billion at the time of purchase. Equity securities include domestic and foreign common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”), exchange traded funds (“ETFs”), and other types of investment companies. The Fund may also invest in private placements in these types of securities. The Fund may invest in ETFs and other types of investment companies that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein. ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities. The Fund may invest up to 15% of its net assets in foreign securities, including emerging markets.

The Adviser follows an investment philosophy referred to as “flexible equity.” Flexibility allows the Adviser to look at many types of opportunities expanding the bargain hunting concepts of value investing to a broad range of opportunities. The Adviser emphasizes individual security selection based on identifying long-term attractive businesses, i.e., those with significant desirable traits and few or no undesirable traits, when they are available at bargain prices. Desirable traits include favorable business economics supported by enduring competitive advantages, capable and trustworthy management, positive industry dynamics and sensible capital allocation. Bargain prices most often arise in the stock market due to short-term investor perceptions or temporary business challenges creating undue price declines and price recovery potential, or unrecognized favorable prospects within a business or changes for the better in company management or industry conditions.

With respect to 20% of its assets, the Fund may invest in investment grade securities or unrated securities determined by the Adviser to be of comparable quality.

The sale of a company’s equity securities may arise if the securities’ market price exceeds the Adviser’s estimate of intrinsic value, if the ratio of risk and rewards of continuing to own the company’s equity is no longer attractive, or if the Adviser needs to raise cash to purchase a more attractive investment opportunity, satisfy net redemptions, or other purposes.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.
•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.
•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Medium Capitalization Company Risk. Securities of medium sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of medium-sized companies may decline more in response to selling pressures.

•Non-Investment Grade ("Junk Bond") Securities Risk. Securities rated below investment grade, i.e., Ba or BB and lower (“junk bonds”), are subject to greater risks of loss of your money than higher rated securities. Compared with issuers of investment grade fixed-income securities, junk bonds are more likely to encounter financial difficulties and to be materially affected by these difficulties.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Smaller Capitalization Company Risk. Securities of smaller sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of smaller companies may decline more in response to selling pressures.

•Value Company Risk. The stock of value companies can continue to be undervalued for long periods of time and not realize its expected value. The value of the Fund may decrease in response to the activities and financial prospects of an individual company.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares, Advisor Shares and Institutional Shares for 1 year, 5 year, and 10 year periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Flexible Value Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/flexible-equity-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Flexible Equity Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 17.12%. During the periods shown in the chart, the highest quarterly return was 23.97% (for the quarter ended June 30, 2020) and the lowest quarterly return was -21.28% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 17.12%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.28%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Flexible Equity Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock NOTE: The Flexible Equity Fund offers three classes of shares. Investor Shares commenced operations on November 30, 2006 as part of the Predecessor Fund, Advisor Shares commenced operations on January 24, 2007 as part of the Predecessor Fund, and Institutional Shares commenced operations on October 19, 2012. Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. Prior to July 1, 2011, the Advisor Shares were known as A Shares. Prior to October 19, 2012, Investor Shares were known as Institutional Shares.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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Flexible Equity Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index    (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
10 Years rr_AverageAnnualReturnYear10 13.88%
Brown Advisory Flexible Equity Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 302
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 677
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.06%
5 Years rr_AverageAnnualReturnYear05 16.48%
10 Years rr_AverageAnnualReturnYear10 14.69%
Brown Advisory Flexible Equity Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 221
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 384
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 859
Annual Return 2011 rr_AnnualReturn2011 4.04%
Annual Return 2012 rr_AnnualReturn2012 18.12%
Annual Return 2013 rr_AnnualReturn2013 35.52%
Annual Return 2014 rr_AnnualReturn2014 12.73%
Annual Return 2015 rr_AnnualReturn2015 (2.95%)
Annual Return 2016 rr_AnnualReturn2016 9.37%
Annual Return 2017 rr_AnnualReturn2017 24.12%
Annual Return 2018 rr_AnnualReturn2018 (4.07%)
Annual Return 2019 rr_AnnualReturn2019 36.33%
Annual Return 2020 rr_AnnualReturn2020 19.85%
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.85%
5 Years rr_AverageAnnualReturnYear05 16.30%
10 Years rr_AverageAnnualReturnYear10 14.51%
Brown Advisory Flexible Equity Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel – Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.94%
5 Years rr_AverageAnnualReturnYear05 15.61%
10 Years rr_AverageAnnualReturnYear10 14.11%
Brown Advisory Flexible Equity Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel – Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.35%
5 Years rr_AverageAnnualReturnYear05 13.08%
10 Years rr_AverageAnnualReturnYear10 12.20%
Brown Advisory Flexible Equity Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.56%
5 Years rr_AverageAnnualReturnYear05 16.01%
10 Years rr_AverageAnnualReturnYear10 14.24%
Brown Advisory Equity Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Equity Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Equity Income Fund (the “Fund”) seeks to provide current dividend yield and dividend growth.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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 October 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions and dealer mark-ups, 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 portfolio turnover rate for the Fund was 20% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same (taking into account the contractual expense limitation being in effect for the period through October 31, 2022).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Adviser seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of dividend paying equity securities.  The Adviser may invest in securities of companies of various market capitalizations but will focus on medium and large capitalization companies.  Medium and large market capitalization companies are, according to the Adviser, those companies with market capitalizations of greater than $2 billion at the time of initial investment.  Equity securities include domestic and foreign common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), Master Limited Partnerships (“MLPs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”), and the Fund may also invest in private placements in these types of securities.  To the extent the Fund invests in MLPs, its investments will be restricted to holding interests in limited partners of such investments.  To the extent the Fund invests in ETFs, it will do so primarily in ETFs that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.  The Fund may also invest in debt-securities, including lower-rated debt-securities (“junk bonds”) and foreign securities including depositary receipts.

As the Adviser seeks to reduce the risk of permanent loss of capital, the Adviser follows an investment strategy referred to as “equity income”, emphasizing current income and a conservative stock portfolio.  The equity income strategy seeks to generally maintain a portfolio yield that is greater than the S&P 500® Index.  Within that context, the balance between current income and prospective growth of dividends is driven by fundamental stock selection.

The Fund may invest up to 25% of its net assets in publicly traded MLPs. MLPs are businesses organized as limited partnerships that trade their proportionate shares of the partnership (units) on a public exchange. MLPs are required to pay out most or all of their earnings in distributions.

With respect to 20% of its assets, the Fund may invest in (1) investment grade and non-investment grade debt securities (i.e., junk bonds), or (2) unrated debt securities determined by the Adviser to be of comparable quality. 

The Adviser may sell a stock if the stock has reached a price whereby its risk/reward characteristics are not as favorable, the company’s fundamentals have deteriorated so that the original investment thesis for holding the stock no longer holds or if a better opportunity has been identified.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s net asset value (“NAV”) and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Master Limited Partnership Risk. Investing in Master Limited Partnerships (“MLPs”) entails risk related to fluctuations in energy prices, decreases in supply of or demand for energy commodities, unique tax consequences due to the partnership structure and various other risks.

•Medium Capitalization Company Risk. Securities of medium-sized companies held by the Fund may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of medium-sized companies may decline more in response to selling pressures.
•Non-Investment Grade (“Junk Bond”) Securities Risk. Securities rated below investment grade, i.e., Ba or BB and lower (“junk bonds”), are subject to greater risks of loss of your money than higher rated securities. Compared with issuers of investment grade fixed-income securities, junk bonds are more likely to encounter financial difficulties and to be materially affected by these difficulties.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.
•Value Company Risk. The stock of value companies can continue to be undervalued for long periods of time and not realize its expected value. The value of the Fund may decrease in response to the activities and financial prospects of an individual company.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares, Advisor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Equity Income Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/equity-income-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Equity Income Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 13.67%. During the period shown in the chart, the highest quarterly return was 17.23% (for the quarter ended June 30, 2020) and the lowest quarterly return was -21.74% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.23%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.74%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Equity Income Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE: The Equity Income Fund offers three classes of shares. Investor Shares and Advisor Shares each commenced operations on December 29, 2011 as part of the Predecessor Fund, and Institutional Shares commenced operations on October 19, 2012. Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. Prior to October 19, 2012, Investor Shares were known as Institutional Shares.

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 certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Equity Income Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index    (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
Since Inception rr_AverageAnnualReturnSinceInception 15.21%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2011
Brown Advisory Equity Income Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFDX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.80%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.76% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 251
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 440
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 986
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.81%
5 Years rr_AverageAnnualReturnYear05 11.59%
Since Inception rr_AverageAnnualReturnSinceInception 11.13%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2011
Brown Advisory Equity Income Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIADX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.91% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 299
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 522
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,163
Annual Return 2012 rr_AnnualReturn2012 11.23%
Annual Return 2013 rr_AnnualReturn2013 28.04%
Annual Return 2014 rr_AnnualReturn2014 10.16%
Annual Return 2015 rr_AnnualReturn2015 (5.36%)
Annual Return 2016 rr_AnnualReturn2016 9.35%
Annual Return 2017 rr_AnnualReturn2017 20.24%
Annual Return 2018 rr_AnnualReturn2018 (5.96%)
Annual Return 2019 rr_AnnualReturn2019 30.37%
Annual Return 2020 rr_AnnualReturn2020 6.64%
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.64%
5 Years rr_AverageAnnualReturnYear05 11.44%
Since Inception rr_AverageAnnualReturnSinceInception 10.97%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2011
Brown Advisory Equity Income Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel – Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.94%
5 Years rr_AverageAnnualReturnYear05 9.40%
Since Inception rr_AverageAnnualReturnSinceInception 9.24%
Brown Advisory Equity Income Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel – Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.03%
5 Years rr_AverageAnnualReturnYear05 8.79%
Since Inception rr_AverageAnnualReturnSinceInception 8.60%
Brown Advisory Equity Income Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BADAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.20%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 377
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 656
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,451
Label rr_AverageAnnualReturnLabel – Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.37%
5 Years rr_AverageAnnualReturnYear05 11.15%
Since Inception rr_AverageAnnualReturnSinceInception 10.69%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2011
Brown Advisory Sustainable Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Sustainable Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Sustainable Growth Fund (the “Fund”) seeks to achieve capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Brown Advisory Sustainable Growth Fund seeks to achieve capital appreciation. To achieve its objective, the Fund invests at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of sustainable domestic companies. The Fund invests primarily in the securities of medium and large capitalization companies that Brown Advisory LLC
(the “Adviser”) believes (1) have the fundamental strengths (strong financials and business models) to outperform their peers and deliver above-average earnings growth over a market cycle, (2) effectively implement Sustainable Business Advantages (described below), and (3) have attractive valuations.

The investment process starts with fundamentals. The Adviser seeks companies with strong business models and prospects for growth, strong cash flow generation, and a solid track record of execution, among other qualities. In addition, the Adviser views Environmental, Social and Governance (“ESG”) factors as material to fundamentals and seeks to understand their impact on companies in which the Fund may invest. The Adviser leverages proprietary ESG research that seeks to understand ESG risk management practices and sustainable opportunities for every security added to the portfolio.

As part of assessing sustainable opportunities, the Adviser seeks to identify sustainable companies which are defined as possessing at least one of the following:

(1) Companies whose internal sustainability strategies lead to one or more Sustainable Business Advantages (such as revenue growth, cost improvements, or enhanced franchise value), or that lead to reduced risk to a company’s prospects for growth;
(2) Companies whose products have a competitive advantage as a result of sustainability drivers such as resource efficient design or manufacturing; or
(3) Companies whose products or services offer solutions to long-term sustainability challenges.

Sustainable companies, by their nature, seek to manage risks, not only related to negative social outcomes, but also ones that might harm their license to operate. The Fund expects to have low to no exposure to companies that have received international sanctions, derive significant direct revenue from gambling or the production of alcohol, tobacco, weapons, or fossil fuel extraction.

The Adviser pursues active, strategic engagement with companies and other stakeholders in an effort to enhance due diligence and monitor ESG risks and sustainable opportunities that may impact the investment thesis. The Adviser’s ESG research team monitors the companies in the portfolio on an on-going basis, and additional monitoring is also undertaken through a quarterly review of certain ESG characteristics of the Fund.

Additionally, while driving impact is not an input to the investment thesis, the Adviser often finds an overlap between Sustainable Business Advantage with positive ESG outcomes.

Finally, the Adviser uses scenario analyses to assess the company’s valuation and potential for appreciation or downside risk. Due diligence on a company’s financial fundamentals and Sustainable Business Advantages is conducted collaboratively among the Fund’s portfolio managers, the Adviser’s ESG research team, and fundamental analysts.

In addition to the Adviser’s proprietary and qualitative ESG analysis, the Adviser has access to ESG-related data from third-party providers. The Adviser does not solely rely on third-party data or recommendations when making investment decisions for the Fund. The ESG evaluation process considers risks and opportunities holistically, meaning a security will not necessarily be excluded from investment due to any one particular factor if the overall analysis results in a favorable evaluation by the Adviser. Investing on the basis of ESG criteria is qualitative and subjective by nature, and there can be no assurance that the process utilized by the Fund’s vendors or any judgment exercised by the Adviser will reflect the beliefs or values of any particular investor. The data informing this process is derived from third party sources, including companies themselves. The Fund’s vendors provide ESG-related data, research and rating services. The Adviser believes its process is reasonably designed, although such data is inherently subject to interpretation, restatement, delay and omission outside the Adviser’s control. The Adviser considers each proxy voting proposal related to holdings in the Fund on its own merits and an independent determination is made based on the relevant facts and circumstances, including both fundamental and ESG factors. Proposals regarding environmental, social and governance issues, in general, are supported, especially when they would have a clear and direct positive financial effect on shareholder value and would not be burdensome or impose unnecessary or excessive costs on the issuer.
Medium and large capitalization companies are, according to the Adviser, those companies with market capitalizations generally greater than $2 billion at time of purchase. The Fund may also invest a portion of the portfolio in equity securities of small market capitalization companies. The equity securities in which the Fund principally invests are common stocks. Furthermore, the Fund may invest up to 15% of assets in foreign securities (including American Depositary Receipts (“ADRs”)), which may include emerging markets securities. ADRs may be either sponsored or unsponsored. The Fund also may invest in real estate investment trusts (“REITs”).

The Adviser may sell a security or reduce its position for a number of reasons, including:
•The fundamental investment or sustainability thesis is violated;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the Adviser’s long-term expectations.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments. A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance. The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Environmental, Social and Governance Policy Risk. The risk that because the Fund’s ESG criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not
increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Growth Company Risk. Securities of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Smaller and Medium Capitalization Company Risk. Securities of smaller and medium sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of smaller companies may decline more in response to selling pressures.

•Sustainability Policy Risk. The Fund’s investment focus on sustainability factors could cause it to make or avoid investments that could result in the Fund underperforming similar funds that do not have a sustainability focus.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares, Advisor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/sustainable-growth-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Sustainable Growth Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 19.20%. During the period shown in the chart, the highest quarterly return was 28.71% (for the quarter ended June 30, 2020) and the lowest quarterly return was -12.32% (for the quarter ended December 31, 2018).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 19.20%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 28.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.32%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Sustainable Growth Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Sustainable Growth Fund | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000® Growth Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 38.49%
5 Years rr_AverageAnnualReturnYear05 21.00%
Since Inception rr_AverageAnnualReturnSinceInception 18.80%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Sustainable Growth Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFWX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 39.09%
5 Years rr_AverageAnnualReturnYear05 21.63%
Since Inception rr_AverageAnnualReturnSinceInception 19.45%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Sustainable Growth Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAWX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 990
Annual Return 2013 rr_AnnualReturn2013 33.30%
Annual Return 2014 rr_AnnualReturn2014 6.24%
Annual Return 2015 rr_AnnualReturn2015 12.86%
Annual Return 2016 rr_AnnualReturn2016 5.52%
Annual Return 2017 rr_AnnualReturn2017 27.90%
Annual Return 2018 rr_AnnualReturn2018 4.45%
Annual Return 2019 rr_AnnualReturn2019 34.88%
Annual Return 2020 rr_AnnualReturn2020 38.88%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 38.88%
5 Years rr_AverageAnnualReturnYear05 21.43%
Since Inception rr_AverageAnnualReturnSinceInception 19.27%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Sustainable Growth Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 38.88%
5 Years rr_AverageAnnualReturnYear05 21.04%
Since Inception rr_AverageAnnualReturnSinceInception 18.77%
Brown Advisory Sustainable Growth Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 23.02%
5 Years rr_AverageAnnualReturnYear05 17.45%
Since Inception rr_AverageAnnualReturnSinceInception 16.17%
Brown Advisory Sustainable Growth Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAWAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 38.53%
5 Years rr_AverageAnnualReturnYear05 21.13%
Since Inception rr_AverageAnnualReturnSinceInception 18.98%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Mid-Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Mid-Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Mid-Cap Growth Fund (the “Fund”) seeks to achieve long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 48% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 48.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal conditions, the Adviser seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of mid-cap domestic companies.  The Adviser
considers mid-cap companies to be those with market capitalizations that fall within the range of the market capitalizations of companies in the Russell Midcap® Growth Index. As of September 30, 2021, the range was from $530 million to $69.6 billion dollars. Market capitalization is measured at the time of purchase. The Fund invests primarily in companies the Adviser believes have above average growth prospects.

The Adviser conducts an in-depth analysis of a company’s fundamentals to identify those companies it believes have the potential to compound earnings at an above-average rate for an extended period of time. The Fund invests primarily in companies the Adviser believes possess “3G” criteria: durable growth, sound governance, and scalable go-to-market strategies.  In considering durable growth, the Adviser assesses whether there is a large and growing market, whether the company is a market leader and/or is gaining market share, and whether a company has a differentiated product offering. The Adviser examines a company’s governance characteristics including the strength of management, whether there is a shareholder-friendly board, and whether there is an aligned incentive system between management and shareholders. Finally, the Adviser evaluates whether a company’s go-to-market strategies will result in incremental revenue, high and/or rising margins, and the efficient use of capital.

Equity securities include domestic common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”), exchange traded funds (“ETFs”), and other types of investment companies.  The Fund may also invest in private placements in these types of securities.  The Fund may invest in ETFs and other types of investment companies that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.  The Fund may invest up to 20% of its net assets in foreign securities.

The Adviser may sell a security or reduce its position if it believes:
•The security subsequently fails to meet initial investment criteria;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the long-term expectation.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments. A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance. The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.
•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Growth Company Risk. Securities of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Medium Capitalization Company Risk. Securities of medium capitalization companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of medium-sized companies may decline more in response to selling pressures.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks
associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares and Institutional Shares for the 1 year and since inception periods compare to a broad-based market index.

Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/mid-cap-growth-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Mid-Cap Growth Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 7.03%. During the period shown in the chart, the highest quarterly return was 29.58% (for the quarter ended June 30, 2020) and the lowest quarterly return was -22.60% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.03%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.60%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Mid-Cap Growth Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE:  The Mid-Cap Growth Fund offers two classes of shares.  Investor Shares commenced operations on October 2, 2017, and Institutional Shares commenced operations on July 2, 2018.  Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. 

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.
After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Mid-Cap Growth Fund | Russell Midcap® Growth Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell Midcap® Growth Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 35.59%
Since Inception rr_AverageAnnualReturnSinceInception 21.05%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2017
Brown Advisory Mid-Cap Growth Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.56%
Since Inception rr_AverageAnnualReturnSinceInception 20.97%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2017
Brown Advisory Mid-Cap Growth Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BMIDX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Annual Return 2018 rr_AnnualReturn2018 (1.72%)
Annual Return 2019 rr_AnnualReturn2019 38.10%
Annual Return 2020 rr_AnnualReturn2020 32.27%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.27%
Since Inception rr_AverageAnnualReturnSinceInception 20.77%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2017
Brown Advisory Mid-Cap Growth Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 32.27%
Since Inception rr_AverageAnnualReturnSinceInception 20.60%
Brown Advisory Mid-Cap Growth Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 19.10%
Since Inception rr_AverageAnnualReturnSinceInception 16.47%
Brown Advisory Mid-Cap Growth Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Brown Advisory Small-Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Small‑Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Small-Cap Growth Fund (the “Fund”) seeks to achieve long-term capital appreciation by primarily investing in equity securities.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 32% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of small domestic companies.   Small companies, according to the Adviser, are companies whose market capitalizations are generally less than $6 billion or the maximum capitalization of companies in the Russell 2000® Growth Index (which was approximately $17 billion as of September 30, 2021), whichever is greater, at the time of purchase. The Fund invests primarily in companies the Adviser believes have above average growth prospects.  The Adviser conducts an in-depth analysis of a company’s fundamentals to identify those companies it believes have the potential for long-term earnings growth that is not fully reflected in the security’s price.

Equity securities include domestic common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”).  The Fund may also invest in private placements in these types of securities.  The Fund invests primarily in ETFs that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.  The Fund may invest up to 20% of its net assets in foreign securities, including in emerging markets.

The Adviser may sell a security or reduce its position if it believes:
•The security subsequently fails to meet initial investment criteria;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the long-term expectation.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped
securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Growth Company Risk. Securities of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.
•Smaller Company Risk. Securities of companies smaller than larger companies may be more volatile and as a result, the price of smaller companies may decline more in response to selling pressure.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares, Advisor Shares and Institutional Shares for 1 year, 5 year, and 10 year periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Small-Cap Growth Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.

Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/small-cap-growth-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Small-Cap Growth Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 6.06%. During the periods shown in the chart, the highest quarterly return was 30.56% (for the quarter ended June 30, 2020) and the lowest quarterly return was -23.30% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 6.06%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.30%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Small-Cap Growth Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE: The Small-Cap Growth Fund offers three classes of shares. Investor Shares commenced operations on June 28, 1999 as part of the Predecessor Fund, Advisor Shares commenced operations on April 25, 2006 as part of the Predecessor Fund, and Institutional Shares commenced operations on September 20, 2002 as part of the Predecessor Fund. Prior to July 1, 2011, the Advisor Shares were known as A Shares. Prior to October 19, 2012, Investor Shares were known as Institutional Shares and Institutional Shares were known as D Shares.

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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Small-Cap Growth Fund | Russell 2000® Growth Index (reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 34.63%
5 Years rr_AverageAnnualReturnYear05 16.36%
10 Years rr_AverageAnnualReturnYear10 13.48%
Brown Advisory Small-Cap Growth Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 31.94%
5 Years rr_AverageAnnualReturnYear05 16.76%
10 Years rr_AverageAnnualReturnYear10 13.95%
Brown Advisory Small-Cap Growth Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.11%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 113
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 353
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 612
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,352
Annual Return 2011 rr_AnnualReturn2011 (2.71%)
Annual Return 2012 rr_AnnualReturn2012 14.45%
Annual Return 2013 rr_AnnualReturn2013 40.54%
Annual Return 2014 rr_AnnualReturn2014 0.02%
Annual Return 2015 rr_AnnualReturn2015 8.05%
Annual Return 2016 rr_AnnualReturn2016 9.55%
Annual Return 2017 rr_AnnualReturn2017 16.91%
Annual Return 2018 rr_AnnualReturn2018 (4.36%)
Annual Return 2019 rr_AnnualReturn2019 33.49%
Annual Return 2020 rr_AnnualReturn2020 31.76%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 31.76%
5 Years rr_AverageAnnualReturnYear05 16.59%
10 Years rr_AverageAnnualReturnYear10 13.80%
Brown Advisory Small-Cap Growth Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 31.52%
5 Years rr_AverageAnnualReturnYear05 15.83%
10 Years rr_AverageAnnualReturnYear10 12.41%
Brown Advisory Small-Cap Growth Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 18.97%
5 Years rr_AverageAnnualReturnYear05 13.16%
10 Years rr_AverageAnnualReturnYear10 11.03%
Brown Advisory Small-Cap Growth Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BASAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 138
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 745
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,635
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 31.43%
5 Years rr_AverageAnnualReturnYear05 16.29%
10 Years rr_AverageAnnualReturnYear10 13.50%
Brown Advisory Small‑Cap Fundamental Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Small‑Cap Fundamental Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Small-Cap Fundamental Value Fund (the “Fund”) seeks to achieve long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 42% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 42.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of small capitalization companies. Equity securities include common stock, preferred stock, equity-equivalent securities such as convertible securities, stock futures contracts, equity options, other investment companies, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”), and the Fund may also invest in private placements in these types of securities.  Small companies, according to the Adviser, are companies whose market capitalizations are generally less than $6 billion at the time of purchase.  The Fund invests primarily in equity securities that trade in the U.S. securities markets and that the Adviser believes are undervalued, broadly defined as trading at a discount to the estimated economic value of a company’s underlying business.  The Adviser uses a research-driven analysis that results in the Fund’s portfolio having an emphasis on out-of-favor or under-followed, cash-generating companies with sustainable business models, strong finances, competent management and a demonstrable record of profitability and self-funded growth.  The Fund may also invest in cyclical companies or companies that have experienced a temporary setback if the valuation of the company is at an appropriate discount to the long-term earnings potential of the company.  To a more limited extent, the Fund may invest up to 15% of its assets in foreign equity securities, including equity securities from emerging markets.  With respect to 20% of its assets, the Fund may also invest in foreign or domestic debt securities, including up to 5% of its assets in distressed debt securities.  The Fund may utilize options, futures contracts and options on futures.  These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  By investing in derivatives, the Fund attempts to achieve the economic equivalence it would achieve if it were to invest directly in the underlying security.  Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Fund invests primarily in ETFs that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.

The Adviser may sell a security or reduce its position if:
•It has reached its target price;
•Its present reward to risk ratio is unattractive;
•It is overvalued; or
•The company’s fundamentals have deteriorated in a material, long-term manner.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the
deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency
devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Non-Investment Grade ("Junk Bond") Securities Risk. Securities rated below investment grade, i.e., Ba or BB and lower (“junk bonds”), are subject to greater risks of loss of your money than higher rated securities. Compared with issuers of investment grade fixed-income securities, junk bonds are more likely to encounter financial difficulties and to be materially affected by these difficulties.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.
•Smaller Company Risk. Securities of companies smaller than larger companies may be more volatile and as a result, the price of smaller companies may decline more in response to selling pressure.

•Value Company Risk. The stock of value companies can continue to be undervalued for long periods of time and not realize its expected value. The value of the Fund may decrease in response to the activities and financial prospects of an individual company.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares, Advisor Shares and Institutional Shares for the 1 year, 5 year, and 10 year periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Small-Cap Fundamental Value Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/small-cap-fundamental-value-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Small-Cap Fundamental Value Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 19.90%. During the periods shown in the chart, the highest quarterly return was 20.73% (for the quarter ended December 31, 2020) and the lowest quarterly return was -36.84% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 19.90%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.73%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.84%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Small-Cap Fundamental Value Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Advisor Shares and Institutional Shares is based on the performance of Investor Shares, adjusted for the higher expenses applicable to Advisor Shares and lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE: The Small-Cap Fundamental Value Fund offers three classes of shares. Investor Shares commenced operations on December 31, 2008 as part of the Predecessor Fund, Advisor Shares commenced operations on July 28, 2011 as part of the Predecessor Fund, and Institutional Shares commenced operations on October 19, 2012. Performance shown prior to inception of the Advisor Shares and Institutional Shares is based on the performance of Investor Shares, adjusted for the higher expenses applicable to Advisor Shares and lower expenses applicable to Institutional Shares. Prior to October 19, 2012, Investor Shares were known as Institutional Shares.

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 certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor. After-tax returns shown are not relevant to investors who hold their
Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Small‑Cap Fundamental Value Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 4.63%
5 Years rr_AverageAnnualReturnYear05 9.65%
10 Years rr_AverageAnnualReturnYear10 8.66%
Brown Advisory Small‑Cap Fundamental Value Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAUUX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 525
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,166
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.56%)
5 Years rr_AverageAnnualReturnYear05 6.91%
10 Years rr_AverageAnnualReturnYear10 9.35%
Brown Advisory Small‑Cap Fundamental Value Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAUX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,340
Annual Return 2011 rr_AnnualReturn2011 2.05%
Annual Return 2012 rr_AnnualReturn2012 21.40%
Annual Return 2013 rr_AnnualReturn2013 40.36%
Annual Return 2014 rr_AnnualReturn2014 5.98%
Annual Return 2015 rr_AnnualReturn2015 (5.70%)
Annual Return 2016 rr_AnnualReturn2016 21.86%
Annual Return 2017 rr_AnnualReturn2017 12.20%
Annual Return 2018 rr_AnnualReturn2018 (13.29%)
Annual Return 2019 rr_AnnualReturn2019 23.99%
Annual Return 2020 rr_AnnualReturn2020 (5.70%)
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.70%)
5 Years rr_AverageAnnualReturnYear05 6.75%
10 Years rr_AverageAnnualReturnYear10 9.19%
Brown Advisory Small‑Cap Fundamental Value Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (5.80%)
5 Years rr_AverageAnnualReturnYear05 5.59%
10 Years rr_AverageAnnualReturnYear10 8.11%
Brown Advisory Small‑Cap Fundamental Value Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (3.30%)
5 Years rr_AverageAnnualReturnYear05 5.20%
10 Years rr_AverageAnnualReturnYear10 7.34%
Brown Advisory Small‑Cap Fundamental Value Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAUAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 137
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,624
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.96%)
5 Years rr_AverageAnnualReturnYear05 6.48%
10 Years rr_AverageAnnualReturnYear10 8.92%
Brown Advisory Sustainable Small-Cap Core Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Sustainable Small-Cap Core Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Sustainable Small-Cap Core Fund (the “Fund”) seeks long-term capital appreciation by investing primarily in equity securities of small-cap companies.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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 October 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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. No portfolio turnover rate is provided for the Fund because the Fund had not commenced operations prior to the fiscal year ended June 30, 2021.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” are estimated for the current fiscal year.
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds, and are estimated for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same (taking into account the contractual expense limitation being in effect for the period through October 31, 2022).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of small domestic companies that satisfy the Fund’s Fundamental and Environmental, Social and Governance (“ESG”) criteria. The Adviser will seek to balance growth oriented and value oriented holdings to achieve a core portfolio. Small companies, according to the Adviser, are companies whose market capitalizations are generally less than $6 billion or the maximum capitalization of companies in the Russell 2000® Index (which was approximately $19.5 billion as of September 30, 2021), whichever is greater, at the time of purchase. The market capitalizations of the companies in the Fund’s portfolio and the Russell 2000® Index changes over time; the Fund will not automatically sell or cease to purchase stock of a company it already owns just because the company’s market capitalization grows or falls outside this range.

Equity securities include domestic common and preferred stock, equity-equivalent securities such as convertible securities, stock futures contracts, equity options, other investment companies, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”). The Fund may also invest in private placements in these types of securities. The Fund may invest in ETFs that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein. ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities. The Fund may invest up to 20% of its net assets in foreign securities, including in emerging markets.

The Adviser assesses a company’s ESG profile through conducting ESG research and leveraging engagement when appropriate through dialogue with company management teams as part of its fundamental due diligence process. ESG factors are considered systematically through leveraging a repeatable process that strives to assess how issuers manage ESG risks and sustainable investment opportunities.

As part of the fundamental research approach, the Adviser has a process to integrate, identify and consider the ESG risks and sustainable opportunities throughout the investment lifecycle using a proprietary ESG assessment. The Fund has access to this research and considers material ESG issues. The Fund will invest primarily in securities with established or improving sustainability characteristics.

The Adviser pursues strategic, active engagement with companies and other stakeholders in an effort to enhance due diligence and monitor sustainable opportunities and ESG risks that may impact the investment thesis. Additional monitoring is also undertaken through a quarterly review of certain ESG characteristics of the Fund.

In addition to the Adviser’s proprietary and qualitative ESG analysis, the Adviser has access to ESG-related data from third-party providers. The Adviser does not solely rely on third-party data or recommendations when making investment decisions for the Fund. The ESG evaluation process considers risks and opportunities holistically, meaning a security will not necessarily be excluded from investment due to any one particular factor if the overall analysis results in a favorable evaluation by the Adviser.
The ESG team may also engage the issuer or relevant stakeholders of the issuer to gain a deeper understanding of a risk, promote improved risk management, and/or provide insight on potential opportunities. Investing on the basis of ESG criteria is qualitative and subjective by nature, and there can be no assurance that the process utilized by the Fund’s vendors or any judgment exercised by the Adviser will reflect the beliefs or values of any particular investor. The data informing this process is derived from third party sources, including companies themselves. The Fund’s vendors provide ESG-related data, research and rating services. The Adviser believes its process is reasonably designed, although such data is inherently subject to interpretation, restatement, delay and omission outside the Adviser’s control.

Due to the ESG investment approach taken by the portfolio managers, the Fund expects to have minimal exposure to companies whose business activities are significantly exposed to areas of controversial business, such as conventional and controversial weapons, alcohol, tobacco, gambling, adult entertainment, and/or extraction, exploration, production or refining of fossil fuels. However, the Fund may hold companies which the Adviser believes are indirectly or insignificantly exposed to these business activities. The Adviser considers each proxy voting proposal related to holdings in the Fund on its own merits and an independent determination is made based on the relevant facts and circumstances, including both fundamental and ESG factors. Proposals regarding environmental, social and governance issues, in general, are supported, especially when they would have a clear and direct positive financial effect on shareholder value and would not be burdensome or impose unnecessary or excessive costs on the issuer.

The Adviser may sell a security or reduce its position if it believes:
•The security subsequently fails to meet initial investment criteria;
•The investment no longer meets the Fund’s ESG criteria;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the long-term expectation.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments. A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance. The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies
in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Environmental, Social and Governance Policy Risk. The risk that because the Fund’s ESG criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•New Fund Risk. The Fund is new with a limited operating history and there can be no assurance that the Fund will grow to or maintain an economically viable size.
•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Smaller Company Risk. Securities of companies smaller than larger companies may be more volatile and as a result, the price of smaller companies may decline more in response to selling pressure.

•Sustainability Policy Risk. The Fund’s investment focus on sustainability factors could cause it to make or avoid investments that could result in the Fund underperforming similar funds that do not have a sustainability focus.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock Performance information for the Fund is not included because the Fund did not have one full calendar year of performance prior to the date of this prospectus. Performance information will be available in the prospectus once the Fund has at least one calendar year of performance. Updated performance information is available online at https://www.brownadvisory.com/mf/funds/sustainable-small-cap-core-fund or by calling 800-540-6807 (toll free) or 414-203-9064.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information for the Fund is not included because the Fund did not have one full calendar year of performance prior to the date of this prospectus.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-540-6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Brown Advisory Sustainable Small-Cap Core Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.24%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.94% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 351
Brown Advisory Sustainable Small-Cap Core Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.24%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.09% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 398
Brown Advisory Sustainable Small-Cap Core Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [4]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.24%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.34% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 136
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 475
Brown Advisory Global Leaders Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Global Leaders Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Global Leaders Fund (the “Fund”) seeks to achieve long-term capital appreciation by investing primarily in global equities.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 14% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.00%
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds, and are estimated for the current fiscal year. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund aims to achieve its investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities. The Fund also will, under normal market conditions: (1) invest at least 40% of its assets outside the United States, or if market conditions are not favorable, at least 30% of its assets outside the United States, and (2) hold securities of issuers located in at least three countries. The Fund determines where a company is located, and thus, whether a company is considered to be located outside the United States by considering whether: (i) it is organized under the laws of or maintains its principal office in a country located outside the United States; (ii) its securities are principally traded on trading markets in countries located outside the United States; (iii) it derives at least 50% of its total revenue or profits from either goods produced or services performed or sales made in countries located outside the United States; or (iv) it has at least 50% of its assets in countries located outside the United States. The Fund’s non-U.S. investments may include equity securities issued by companies that are established or operating in emerging market countries.

The equity securities in which the Fund may invest will include the equity securities of companies that Brown Advisory Limited (the “Sub-Adviser”) believes are leaders within their industry or country as demonstrated by an ability to deliver high relative return on invested capital over time. This typically can be attributable to, among other things, a strong competitive position and a defendable barrier to entry. These securities also typically use sustainability in a positive way to compound a competitive advantage, and have strong Environmental, Social and Governance (“ESG”) risk management practices. The equity securities in which the Fund may invest include common stock, preferred stock, equity-equivalent securities, such as stock futures contracts, equity options, other investment companies, American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), and exchange traded funds (“ETFs”). The equity securities in which the Fund may invest will generally be issued by mid- and large capitalization companies. Medium and large market capitalization companies are, according to the Sub-Adviser, those companies with market capitalizations generally greater than $2 billion at the time of purchase. In addition to those securities, the Fund may also invest in convertible bonds, Rule 144A securities, U.S. Treasury bills, fixed and/or floating rate U.S. Government securities, real estate investment trusts (“REITs”) and unlisted securities. The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.

The Sub-Adviser views ESG factors as material to fundamentals and seeks to understand their impact on companies in which the Fund may invest. ESG factors are systematically integrated into the Sub-Adviser’s investment decision-making process. The Sub-Adviser leverages proprietary ESG research that seeks to understand sustainable opportunities and ESG risks for every security added to the portfolio.

When assessing the sustainability profile of a company, the Sub-Adviser seeks companies with sustainable opportunities, defined as companies that use sustainability to improve their financial position. One way that companies may improve their financial position is through what the Sub-Adviser deems to be internal sustainability strategies that lead to one or more Sustainable Business Advantages (such as revenue growth, cost improvements, or enhanced franchise value). The Sub-Adviser also seeks companies with low exposure to ESG risks, or that have strong ESG risk management practices in place where ESG risks may be present.

The Sub-Adviser pursues strategic, active engagement with companies and other stakeholders in an effort to enhance due diligence and monitor sustainable opportunities and ESG risks that may impact the investment thesis. Additional monitoring is also undertaken through a quarterly review of certain ESG characteristics of the Fund.

In addition to the Sub-Adviser’s proprietary and qualitative ESG analysis, the Sub-Adviser has access to ESG-related data from third-party providers. The Sub-Adviser does not solely rely on third-party data or recommendations when making investment decisions for the Fund. The ESG evaluation process considers risks and opportunities holistically, meaning a security will not necessarily be excluded from investment due to any one particular factor if the overall analysis results in a favorable evaluation by the Sub-Adviser. The ESG team may also engage the issuer or relevant stakeholders of the issuer to gain a deeper understanding
of a risk, promote improved risk management, and/or provide insight on potential opportunities. Investing on the basis of ESG criteria is qualitative and subjective by nature, and there can be no assurance that the process utilized by the Fund’s vendors or any judgment exercised by the Sub-Adviser will reflect the beliefs or values of any particular investor. The data informing this process is derived from third party sources, including companies themselves. The Fund’s vendors provide ESG-related data, research and rating services. The Sub-Adviser believes its process is reasonably designed, although such data is inherently subject to interpretation, restatement, delay and omission outside the Sub-Adviser’s control. The Sub-Adviser considers each proxy voting proposal related to holdings in the Fund on its own merits and an independent determination is made based on the relevant facts and circumstances, including both fundamental and ESG factors. Proposals regarding environmental, social and governance issues, in general, are supported, especially when they would have a clear and direct positive financial effect on shareholder value and would not be burdensome or impose unnecessary or excessive costs on the issuer.

The Fund may sell its portfolio securities for a variety of reasons, such as to secure gains, limit losses, redeploy assets into more promising opportunities, or, in the Sub-Advisers view, the sustainability profile of the investment is no longer attractive.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks of the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in the alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Currency and Exchange Rate Risk. Investments in currencies, currency futures contracts, forward currency exchange contracts or similar instruments, as well as securities that are denominated in foreign currency, are subject to the risk that the value of a particular currency will change in relation to one or more other currencies. In addition, the Fund may engage in currency hedging transactions. Currency hedging transactions are subject to the risk that a result opposite expectations occurs (an expected decline turns into a rise and conversely) resulting in a loss to the Fund.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives
exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Environmental, Social and Governance Policy Risk. The risk that because the Fund’s ESG criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Growth Company Risk. Securities of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.
•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Fund would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund.

•Medium Capitalization Company Risk. Securities of medium capitalization companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of medium-sized companies may decline more in response to selling pressures.

•Private Placement Risk. The Fund may invest in privately issued securities of foreign common and preferred stock, convertible debt securities, ADRs, real estate investment trusts (“REITs”) and ETFs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Sustainability Policy Risk. The Fund’s investment focus on sustainability factors could cause it to make or avoid investments that could result in the Fund underperforming similar funds that do not have a sustainability focus.

•U.S. Government Securities Risk. Although the Fund’s U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Some obligations issued or guaranteed by U.S. Government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. Government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. Government provides financial support to such U.S. Government-sponsored federal agencies, no assurance can be given that the U.S. Government will always do so, since the U.S. Government is not so obligated by law.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.

•Value Company Risk. The stock of value companies can continue to be undervalued for long periods of time and not realize its expected value. The value of investing primarily in value-oriented securities may decrease in response to the activities and financial prospects of an individual company.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares and Institutional Shares for the 1 year, 5 year and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/global-leaders-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Global Leaders Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 8.95%. During the period shown in the chart, the highest quarterly return was 18.98% (for the quarter ended June 30, 2020) and the lowest quarterly return was -18.78% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 8.95%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.98%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.78%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Global Leaders Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE:  The Global Leaders Fund offers two classes of shares.  Investor Shares commenced operating on July 1, 2015, and Institutional Shares commenced operations on October 31, 2018.  Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. 

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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Global Leaders Fund | FTSE All-World Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel FTSE All-World Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 16.01%
5 Years rr_AverageAnnualReturnYear05 12.19%
Since Inception rr_AverageAnnualReturnSinceInception 9.90%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2015
Brown Advisory Global Leaders Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [6]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.48%
5 Years rr_AverageAnnualReturnYear05 15.89%
Since Inception rr_AverageAnnualReturnSinceInception 14.13%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2015
Brown Advisory Global Leaders Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIALX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [6]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 293
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 509
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,131
Annual Return 2016 rr_AnnualReturn2016 (1.34%)
Annual Return 2017 rr_AnnualReturn2017 33.99%
Annual Return 2018 rr_AnnualReturn2018 (2.58%)
Annual Return 2019 rr_AnnualReturn2019 33.95%
Annual Return 2020 rr_AnnualReturn2020 20.26%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.26%
5 Years rr_AverageAnnualReturnYear05 15.71%
Since Inception rr_AverageAnnualReturnSinceInception 13.96%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2015
Brown Advisory Global Leaders Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 20.23%
5 Years rr_AverageAnnualReturnYear05 15.67%
Since Inception rr_AverageAnnualReturnSinceInception 13.91%
Brown Advisory Global Leaders Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.01%
5 Years rr_AverageAnnualReturnYear05 12.70%
Since Inception rr_AverageAnnualReturnSinceInception 11.28%
Brown Advisory Global Leaders Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [6]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 644
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,420
Brown Advisory Intermediate Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Intermediate Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Intermediate Income Fund (the “Fund”) seeks to provide a high level of current income consistent with preservation of principal within an intermediate-term maturity structure.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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 October 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 50% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same (taking into account the contractual expense limitation being in effect for the period through October 31, 2022).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Adviser seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in fixed income securities such as U.S Government securities, corporate fixed income securities, mortgage-backed and asset-backed securities. The fixed income securities in which the Fund may invest may also include municipal securities issued by states, U.S. territories, and possessions, general obligation securities and revenue securities. The foregoing may include municipal lease obligations and insured municipal securities. The Fund may also invest in other investment companies that invest in similar fixed income securities and the Fund may count such holdings towards the Fund’s 80% investment policy.

The Fund invests in fixed income securities that primarily have a maturity that is between 1 and 10 years and are rated in the top four rating categories of a Nationally Recognized Statistical Rating Organization, or unrated and deemed to be of comparable quality by the Adviser. Under normal circumstances, the Fund’s portfolio will have an average dollar weighted maturity between 3 and 10 years and an average duration of 2 to 5 years. Duration is a measurement of price sensitivity to interest rate changes.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  These derivative instruments will be counted toward the Fund’s 80% policy to the extent they have economic characteristics similar to the securities included within that policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Adviser may sell a fixed income security or reduce its position if:
•    Revised economic forecasts or interest rate outlook requires a repositioning of the portfolio;
•    The security subsequently fails to meet the investment criteria;
•    A more attractive security is found; or
•    The Adviser believes that the security has reached its appreciation potential.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in the alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies (principally, the Brown Advisory Mortgage Securities Fund) in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Mortgage- and Asset-Backed Securities Risk. The Fund may invest in mortgage- and asset-backed securities, which represent “pools” of mortgages or other assets, including consumer loans or receivables held in trust. In a period of rising interest rates, these securities may exhibit additional volatility.

•Municipal Securities Risk. Changes in economic, business or political conditions relating to a particular state, or states, or type of projects may have a disproportionate impact on the Fund. Municipalities continue to experience difficulties in the current economic and political environment. National governmental actions, such as the elimination of tax-exempt status, also
could affect performance. In addition, a municipality or municipal project that relies directly or indirectly on national governmental funding mechanisms may be negatively affected by the national government’s current budgetary constraints. Municipal obligations that the Fund may acquire include municipal lease obligations, which are issued by a state or local government or authority to acquire land and a wide variety of equipment and facilities. If the funds are not appropriated for the following year’s lease payments, then the lease may terminate, with the possibility of default on the lease obligation and significant loss to the Fund. The repayment of principal and interest on some of the municipal securities in which the Fund may invest may be guaranteed or insured by a monoline insurance company or other financial institution. If a company insuring municipal securities in which the Fund invests experiences financial difficulties, the credit rating and price of the security may deteriorate. The Fund may invest more heavily in bonds from certain cities, states or regions than others, which may increase the Fund’s exposure to losses resulting from economic, political, or regulatory occurrences impacting these particular cities, states or regions.

•Prepayment/Extension Risk. Issuers may experience an acceleration in prepayments of mortgage loans or other receivables backing the issuers’ fixed income securities when interest rates decline, which can shorten the maturity of the security, force the Fund to invest in securities with lower interest rates, and reduce the Fund’s return. Issuers may decrease prepayments of principal when interest rates increase, extending the maturity of a fixed income security and causing the value of the security to decline.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Rating Agencies Risk. Ratings are not an absolute standard of quality, but rather general indicators that reflect only the view of the originating rating agencies from which an explanation of the significance of such ratings may be obtained. There is no assurance that a particular rating will continue for any given period of time or that any such rating will not be revised downward or withdrawn entirely if, in the judgment of the agency establishing the rating, circumstances so warrant. A downward revision or withdrawal of such ratings, or either of them, may have an effect on the liquidity or market price of the securities in which the Fund invests. The ratings of securitized assets may not adequately reflect the credit risk of those assets due to their structure.

•U.S. Government Securities Risk. Although the Fund’s U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Some obligations issued or guaranteed by U.S. Government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. Government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. Government provides financial support to such U.S. Government-sponsored federal agencies, no assurance can be given that the U.S. Government will always do so, since the U.S. Government is not so obligated by law.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares and Advisor Shares for 1 year, 5 year and 10 year periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Intermediate Income Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/intermediate-income-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Intermediate Income Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was -0.65%. During the periods shown in the chart, the highest quarterly return was 5.61% (for the quarter ended June 30, 2020) and the lowest quarterly return was -2.33% (for the quarter ended June 30, 2013).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.65%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.61%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.33%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Intermediate Income Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Note: The Intermediate Income Fund currently offers two classes of shares. Investor Shares commenced operations on November 2, 1995 as part of the Predecessor Fund and Advisor Shares commenced operations on May 13, 1991 as part of the Predecessor Fund. Prior to October 19, 2012, Investor Shares were known as Institutional Shares.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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares will vary.
Brown Advisory Intermediate Income Fund | Bloomberg Intermediate US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg Intermediate US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 5.60%
5 Years rr_AverageAnnualReturnYear05 3.46%
10 Years rr_AverageAnnualReturnYear10 3.10%
Brown Advisory Intermediate Income Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.06% [7]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.51%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [8],[9]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.48% [8],[9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
Brown Advisory Intermediate Income Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.06% [7]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.56%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [8],[9]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53% [8],[9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 170
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 296
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 665
Annual Return 2011 rr_AnnualReturn2011 6.11%
Annual Return 2012 rr_AnnualReturn2012 3.81%
Annual Return 2013 rr_AnnualReturn2013 (2.66%)
Annual Return 2014 rr_AnnualReturn2014 3.67%
Annual Return 2015 rr_AnnualReturn2015 0.68%
Annual Return 2016 rr_AnnualReturn2016 2.24%
Annual Return 2017 rr_AnnualReturn2017 2.39%
Annual Return 2018 rr_AnnualReturn2018 0.41%
Annual Return 2019 rr_AnnualReturn2019 6.85%
Annual Return 2020 rr_AnnualReturn2020 5.42%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.42%
5 Years rr_AverageAnnualReturnYear05 3.44%
10 Years rr_AverageAnnualReturnYear10 2.85%
Brown Advisory Intermediate Income Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.68%
5 Years rr_AverageAnnualReturnYear05 2.51%
10 Years rr_AverageAnnualReturnYear10 1.81%
Brown Advisory Intermediate Income Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.19%
5 Years rr_AverageAnnualReturnYear05 2.22%
10 Years rr_AverageAnnualReturnYear10 1.79%
Brown Advisory Intermediate Income Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAIAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.06% [7]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [8],[9]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.78% [8],[9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 249
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 433
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 966
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.28%
5 Years rr_AverageAnnualReturnYear05 3.17%
10 Years rr_AverageAnnualReturnYear10 2.62%
Brown Advisory Total Return Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Total Return Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Total Return Fund (the “Fund”) seeks to provide a competitive total return consistent with preservation of principal.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 130% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 130.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in fixed income securities such as U.S Government securities, corporate fixed income securities (including junk bonds), mortgage-backed and asset-backed securities. The fixed income securities in which the Fund may invest may also include municipal securities issued by states, U.S. territories, and possessions, general obligation securities and revenue securities. The foregoing may include municipal lease obligations and insured municipal securities. The Fund may also invest in other investment companies that invest in similar fixed income securities and the Fund may count such holdings towards the Fund’s 80% investment policy. The Fund may also engage in “To Be Announced” transactions.

The Fund invests in fixed income securities that primarily have a maturity that is between 0 and 30 years and are rated in the top four rating categories of a Nationally Recognized Statistical Rating Organization, or unrated and deemed to be of comparable quality by the Adviser.  Under normal circumstances, the Fund’s portfolio will have an average dollar weighted maturity between 6 and 11 years and an average duration of 3 to 7 years.  Duration is a measurement of price sensitivity to interest rate changes.

The Fund may invest up to 20% of its assets in high-yield securities, which are speculative in nature. The Fund may also utilize derivatives including futures, interest rate swaps and credit default swaps. These positions will be used to manage interest rate risk or to create synthetic exposure to particular credits. Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy.

The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy. The Fund may invest in securities denominated in non-U.S. currencies. The Fund may also invest in bank loans.

The Adviser may sell an investment or reduce its position if:
•Revised economic forecasts or interest rate outlook requires a repositioning of the portfolio;
•The investment subsequently fails to meet the investment criteria;
•Changing credit profile and/or conditions result in an unacceptable risk condition;
•A more attractive investment is found; or
•The Adviser believes that the investment has reached its appreciation potential.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.
•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Mortgage- and Asset-Backed Securities Risk. The Fund may invest in mortgage- and asset-backed securities, which represent “pools” of mortgages or other assets, including consumer loans or receivables held in trust. In a period of rising interest rates, these securities may exhibit additional volatility.

•Municipal Securities Risk.  Adverse economic or political factors in the municipal bond market, including changes in the tax law, could impact the Fund in a negative manner.

•Non-Investment Grade (Junk Bond) Securities Risk. Below investment grade debt securities (also known as “junk bonds”) are speculative and involve a greater risk of default and price change due to changes in the issuer’s creditworthiness. The market prices of these debt securities may fluctuate more than the market prices of investment grade debt securities and may decline significantly in periods of general economic difficulty.

•Portfolio Turnover Risk. High portfolio turnover involves correspondingly greater expenses to a Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestments in other securities. Higher portfolio turnover also may result in higher taxes when Fund shares are held in a taxable account.
•Prepayment/Extension Risk. Issuers may experience an acceleration in prepayments of mortgage loans or other receivables backing the issuers’ fixed income securities when interest rates decline, which can shorten the maturity of the security, force the Fund to invest in securities with lower interest rates, and reduce the Fund’s return. Issuers may decrease prepayments of principal when interest rates increase, extending the maturity of a fixed income security and causing the value of the security to decline.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Rating Agencies Risk. Ratings are not an absolute standard of quality, but rather general indicators that reflect only the view of the originating rating agencies from which an explanation of the significance of such ratings may be obtained. There is no assurance that a particular rating will continue for any given period of time or that any such rating will not be revised downward or withdrawn entirely if, in the judgment of the agency establishing the rating, circumstances so warrant. A downward revision or withdrawal of such ratings, or either of them, may have an effect on the liquidity or market price of the securities in which the Fund invests. The ratings of securitized assets may not adequately reflect the credit risk of those assets due to their structure.

•To Be Announced (“TBA”) Transactions Risk.  The Fund may enter into TBA transactions to purchase mortgage-related securities for a fixed price at a future date. TBA purchase commitments involve a risk of loss if the value of the security to be purchased declines prior to settlement date or if the counterparty does not deliver the securities as promised.

•U.S. Government Securities Risk. Although the Fund’s U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Some obligations issued or guaranteed by U.S. Government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. Government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. Government provides financial support to such U.S. Government-sponsored federal agencies, no assurance can be given that the U.S. Government will always do so, since the U.S. Government is not so obligated by law.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/funds/total-return-fund or by calling 800-540-6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-540-6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Total Return Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was -0.70%. During the period shown in the chart, the highest quarterly return was 8.28% (for the quarter ended June 30, 2020) and the lowest quarterly return was -3.01% (for the quarter ended December 31, 2016).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.70%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.01%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Total Return Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Total Return Fund | Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 7.51%
5 Years rr_AverageAnnualReturnYear05 4.44%
Since Inception rr_AverageAnnualReturnSinceInception 3.79%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2014
Brown Advisory Total Return Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFTX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [10]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 542
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.16%
5 Years rr_AverageAnnualReturnYear05 5.30%
Since Inception rr_AverageAnnualReturnSinceInception 4.31%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2014
Brown Advisory Total Return Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIATX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [10]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
Annual Return 2015 rr_AnnualReturn2015 (0.46%)
Annual Return 2016 rr_AnnualReturn2016 3.55%
Annual Return 2017 rr_AnnualReturn2017 4.52%
Annual Return 2018 rr_AnnualReturn2018 (0.44%)
Annual Return 2019 rr_AnnualReturn2019 9.84%
Annual Return 2020 rr_AnnualReturn2020 9.11%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.11%
5 Years rr_AverageAnnualReturnYear05 5.25%
Since Inception rr_AverageAnnualReturnSinceInception 4.26%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2014
Brown Advisory Total Return Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 7.71%
5 Years rr_AverageAnnualReturnYear05 3.85%
Since Inception rr_AverageAnnualReturnSinceInception 2.96%
Brown Advisory Total Return Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.60%
5 Years rr_AverageAnnualReturnYear05 3.46%
Since Inception rr_AverageAnnualReturnSinceInception 2.72%
Brown Advisory Total Return Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [10]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Brown Advisory Sustainable Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Sustainable Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Sustainable Bond Fund (the “Fund”) seeks to provide a competitive total return consistent with preservation of principal while giving special consideration to certain environmental, social and governance (“ESG”) criteria.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 89% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 89.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in either fixed income securities of issuers that satisfy the Fund’s ESG criteria or in securities where the use of the proceeds satisfy the Fund’s ESG criteria. This 80% investment policy is non-fundamental and may be changed without the vote of shareholders. Shareholders will receive 60 days’ prior written notice of any changes to the Fund’s 80% investment policy. The Fund may invest in corporate fixed income securities, mortgage-backed and asset-backed securities, U.S Government securities and securities issued by foreign entities including foreign-sponsored governmental agencies. The fixed income securities in which the Fund may invest may also include municipal securities issued by states, U.S. territories and possessions, general obligation securities and revenue securities. The foregoing may include municipal lease obligations and insured municipal securities. The Fund may also invest in other investment companies that invest in similar fixed income securities and the Fund may count such holdings towards the Fund’s 80% investment policy. The Fund may also engage in “To Be Announced” transactions. Certain of the fixed income securities that the Fund may invest in are often commonly referred to as “Green Bonds,” "Social Bonds," or "Sustainability Bonds."

The Fund invests in fixed income securities that primarily have a maturity that is between 0 and 30 years and are rated in the top four rating categories of a Nationally Recognized Statistical Rating Organization, or unrated and deemed to be of comparable quality by the Adviser. Under normal circumstances, the Fund’s portfolio will have an average dollar weighted maturity between 6 and 11 years and an average duration of 3 to 7 years. Duration is a measurement of price sensitivity to interest rate changes.

The Fund may invest up to 20% of its assets in high-yield securities (“junk bonds”), which are speculative in nature. The Fund may invest in securities denominated in non-U.S. currencies. The Fund may also invest in bank loans.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, options on futures and credit default swaps. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances. These positions may also be used to manage interest rate risk or to create synthetic exposure to particular credits. Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Adviser utilizes ESG analysis in connection with the Fund's investments in fixed income securities. ESG factors are considered systematically and comprehensively through leveraging a repeatable process that strives to minimize risk and capture opportunity. As part of the fundamental research approach, the Adviser has a process to integrate, identify and consider the ESG risks and opportunities throughout the investment lifecycle using a proprietary ESG Assessment. The Fund has access to this research and considers material ESG issues. The ESG Assessment includes an in-depth ESG Risk Assessment, as well as a Sustainable Opportunity Assessment. The ESG Risk Assessment looks at the issuer's exposure and management of a variety of ESG factors. The Sustainable Opportunity Assessment outlines the positive environmental and social impacts generated by the issuer or individual security. Although qualitative in nature, these assessments include two quantitative scores: an ESG Risk Management Rating and a Sustainable Opportunity Rating. The proprietary ESG ratings framework promotes consistency in how the Adviser thinks about ESG risks and opportunities. A Use of Proceeds Assessment is also conducted for any labeled green, social, or sustainability bonds to assess the impact and determine alignment with International Capital Market Association Principles. The Fund's environmental evaluation considers matters including clean and renewable energy, climate change and water conservation, efficient mass transit and innovative efficiency solutions. The Fund's social evaluation factors focus on matters including labor management, community relations, and accessibility of essential services. The Fund's governance evaluation considers matters including stewardship of debt and capital, board governance and transparency. The outcomes of this process may result in positive environmental and social impacts. While not a thematic fund in nature, the nature of the Adviser's ESG research process has an output on important sustainable investing themes, such as responsible water management, accessibility of essential services like healthcare, transportation, education, and climate mitigation.

The Fund will invest primarily in securities of issuers where the use of proceeds exhibit one or more of the following:
•Have strong environmental factors, including performance on critical environmental impacts;
•Apply extensive sustainability criteria throughout their supply chains;
•Minimize risks to air, water and public health;
•Act as socially responsible companies in the communities in which they operate;
•Have strong governance and labor practices;
•Are environmental innovators such as energy efficiency and clean energy companies; and
•Are sustainable agriculture companies involved in natural and organic foods.

If one consideration is a concern, it does not automatically exclude an issuer from potential investment, and the ESG evaluation process will evaluate all risks and opportunities in an industry. Investing on the basis of ESG criteria is qualitative and subjective by nature, and there can be no assurance that the process utilized by the Fund’s vendors or any judgment exercised by the Adviser will reflect the beliefs or values of any particular investor.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments. A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance. The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by the Fund may cause it to default or become unable to pay interest or principal due on the security.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Environmental, Social and Governance Policy Risk. The risk that because the Fund’s ESG criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.
•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain fixed income securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Market Risk. The portfolio securities held by the Fund are susceptible to general market fluctuations and to volatile increases and decreases in value.  The securities markets may experience declines and the portfolio holdings in the Fund’s portfolio may not increase their earnings at the rate anticipated.  The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities.

•Mortgage- and Asset-Backed Securities Risk. The Fund may invest in mortgage- and asset-backed securities, which represent “pools” of mortgages or other assets, including consumer loans or receivables held in trust. In a period of rising interest rates, these securities may exhibit additional volatility.

•Municipal Securities Risk.  Adverse economic or political factors in the municipal bond market, including changes in the tax law, could impact the Fund in a negative manner.

•Non-Investment Grade (Junk Bond) Securities Risk. Below investment grade debt securities (also known as “junk bonds”) are speculative and involve a greater risk of default and price change due to changes in the issuer’s creditworthiness. The market prices of these debt securities may fluctuate more than the market prices of investment grade debt securities and may decline significantly in periods of general economic difficulty.

•Prepayment/Extension Risk. Issuers may experience an acceleration in prepayments of mortgage loans or other receivables backing the issuers’ fixed income securities when interest rates decline, which can shorten the maturity of the security, force the Fund to invest in securities with lower interest rates, and reduce the Fund’s return. Issuers may decrease prepayments of principal when interest rates increase, extending the maturity of a fixed income security and causing the value of the security to decline.
•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Rating Agencies Risk. Ratings are not an absolute standard of quality, but rather general indicators that reflect only the view of the originating rating agencies from which an explanation of the significance of such ratings may be obtained. There is no assurance that a particular rating will continue for any given period of time or that any such rating will not be revised downward or withdrawn entirely if, in the judgment of the agency establishing the rating, circumstances so warrant. A downward revision or withdrawal of such ratings, or either of them, may have an effect on the liquidity or market price of the securities in which the Fund invests. The ratings of securitized assets may not adequately reflect the credit risk of those assets due to their structure.

•Sustainability Policy Risk. The Fund’s investment focus on sustainability factors could cause it to make or avoid investments that could result in the Fund underperforming similar funds that do not have a sustainability focus.

•To Be Announced (“TBA”) Transactions Risk.  The Fund may enter into TBA transactions to purchase mortgage-related securities for a fixed price at a future date. TBA purchase commitments involve a risk of loss if the value of the security to be purchased declines prior to settlement date or if the counterparty does not deliver the securities as promised.

•U.S. Government Securities Risk. Although the Fund’s U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Some obligations issued or guaranteed by U.S. Government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. Government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. Government provides financial support to such U.S. Government-sponsored federal agencies, no assurance can be given that the U.S. Government will always do so, since the U.S. Government is not so obligated by law.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares and Institutional Shares for the 1 year and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/sustainable-bond-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Sustainable Bond Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was -0.45%. During the period shown in the chart, the highest quarterly return was 6.54% (for the quarter ended June 30, 2020) and the lowest quarterly return was -1.24% (for the quarter ended March 31, 2018).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.45%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.54%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.24%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Sustainable Bond Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE:  The Sustainable Bond Fund offers two classes of shares. Investor Shares commenced operations on August 7, 2017, and Institutional Shares commenced operations on July 2, 2018.  Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. 

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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Sustainable Bond Fund | Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 7.51%
Since Inception rr_AverageAnnualReturnSinceInception 4.88%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 07, 2017
Brown Advisory Sustainable Bond Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAISX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [11]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 579
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.92%
Since Inception rr_AverageAnnualReturnSinceInception 5.09%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 07, 2017
Brown Advisory Sustainable Bond Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BASBX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [11]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.51%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 52
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 164
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 285
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 640
Annual Return 2018 rr_AnnualReturn2018 (0.57%)
Annual Return 2019 rr_AnnualReturn2019 8.90%
Annual Return 2020 rr_AnnualReturn2020 8.87%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.87%
Since Inception rr_AverageAnnualReturnSinceInception 5.03%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 07, 2017
Brown Advisory Sustainable Bond Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 7.34%
Since Inception rr_AverageAnnualReturnSinceInception 3.71%
Brown Advisory Sustainable Bond Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.47%
Since Inception rr_AverageAnnualReturnSinceInception 3.33%
Brown Advisory Sustainable Bond Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [11]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 243
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 942
Brown Advisory Maryland Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Maryland Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Maryland Bond Fund (the “Fund”) seeks to provide a high level of current income exempt from both Federal and Maryland State income taxes without undue risk.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 17% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in Maryland bonds, including bonds issued on behalf of the State of Maryland, its local governments and public financing authorities.  This 80% policy cannot be changed without shareholder approval. The Fund may also invest in municipal securities issued by other states, U.S. territories, and possessions, U.S. Government securities, general obligation securities and revenue securities, including private activity bonds.  The Adviser determines which securities to purchase by first evaluating whether a security falls within the credit guidelines set for the Fund by reviewing the ratings given by a Nationally Recognized Statistical Rating Organization (an “NRSRO”).  The Adviser then determines the appropriate maturity date and coupon choice after analyzing the current and targeted portfolio structure, and whether or not the issue is fairly priced. The Fund is non-diversified which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers. Generally, the average weighted effective maturity of the Fund’s portfolio securities will be between 4 and 10 years.  Normally, the Fund will invest at least 80% of its total assets in securities the interest of which is exempt from Federal and Maryland State income taxes, although such interest may be subject to the Federal alternative minimum tax (“AMT”).  All capital gains are subject to Federal and state taxes.  Municipal securities include municipal bonds, notes, and leases.  Municipal leases are securities that permit government issuers to acquire property and equipment without the security being subject to constitutional and statutory requirements for the issuance of long-term fixed income securities.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  These derivative instruments will be counted toward the Fund’s 80% policy to the extent they have economic characteristics similar to the securities included within that policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Adviser may sell a fixed income security or reduce its position if:
•Revised economic forecasts or interest rate outlook requires a repositioning of the portfolio;
•The security subsequently fails to meet the investment criteria;
•A more attractive security is found; or
•The Adviser believes that the security has reached its appreciated potential.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its
holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Maryland Bonds and Municipal Securities Risk. Adverse economic or political factors in Maryland will affect the Fund’s NAV more than if the Fund invested in more geographically diverse investments. In addition, the State of Maryland and the State’s municipal issuers may also be adversely affected by the economic, social and health risks presented by the ongoing pandemic which could potentially produce a negative financial impact on the future economic fundamentals of issuers of Maryland municipal securities.

•Municipal Securities Risk. Adverse economic or political factors in the municipal bond market, including changes in the tax law, could impact the Fund in a negative manner.

•Non-Diversification Risk.  Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Tax Risk. Municipal securities may decrease in value during times when tax rates are falling. The Fund’s investments are affected by changes in federal income tax rates applicable to, or the continuing federal tax-exempt status of, interest income on municipal obligations. Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the liquidity, marketability and supply and demand for municipal obligations, which would in turn affect the Fund’s ability to acquire and dispose of municipal obligations at desirable yield and price levels.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the
prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares for 1 year, 5 year and 10 year periods compare to a broad-based market index.

The Fund is the successor to the investment performance of the Brown Advisory Maryland Bond Fund (the “Predecessor Fund”) as a result of the reorganization of the Predecessor Fund into the Fund on October 19, 2012. Accordingly, the performance information shown below for periods prior to October 19, 2012 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/maryland-bond-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Maryland Bond Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 1.05%. During the periods shown in the chart, the highest quarterly return was 2.51% (for the quarter ended March 31, 2019) and the lowest quarterly return was -3.07% (for the quarter ended December 31, 2016).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.05%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.51%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.07%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Maryland Bond Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE: Prior to October 19, 2012, Investor Shares were known as Institutional Shares.
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 certain cases, the figure representing “Return after Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period, since a higher after-tax return results when a capital loss occurs upon redemption and
provides an assumed tax deduction that benefits the investor. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Brown Advisory Maryland Bond Fund | Bloomberg 1-10 Year Blended Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg 1-10 Year Blended Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 4.23%
5 Years rr_AverageAnnualReturnYear05 2.96%
10 Years rr_AverageAnnualReturnYear10 3.26%
Brown Advisory Maryland Bond Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 542
Brown Advisory Maryland Bond Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
Annual Return 2011 rr_AnnualReturn2011 5.60%
Annual Return 2012 rr_AnnualReturn2012 2.89%
Annual Return 2013 rr_AnnualReturn2013 (1.55%)
Annual Return 2014 rr_AnnualReturn2014 4.03%
Annual Return 2015 rr_AnnualReturn2015 1.66%
Annual Return 2016 rr_AnnualReturn2016 (0.07%)
Annual Return 2017 rr_AnnualReturn2017 3.91%
Annual Return 2018 rr_AnnualReturn2018 1.44%
Annual Return 2019 rr_AnnualReturn2019 6.70%
Annual Return 2020 rr_AnnualReturn2020 2.33%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.33%
5 Years rr_AverageAnnualReturnYear05 2.84%
10 Years rr_AverageAnnualReturnYear10 2.67%
Brown Advisory Maryland Bond Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.32%
5 Years rr_AverageAnnualReturnYear05 2.80%
10 Years rr_AverageAnnualReturnYear10 2.59%
Brown Advisory Maryland Bond Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.39%
5 Years rr_AverageAnnualReturnYear05 2.73%
10 Years rr_AverageAnnualReturnYear10 2.56%
Brown Advisory Maryland Bond Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Brown Advisory Tax-Exempt Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Tax-Exempt Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Tax-Exempt Bond Fund (the “Fund”) seeks to provide a high level of current income exempt from Federal income tax by investing primarily in intermediate-term investment grade municipal bonds.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 47% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 47.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund will invest at least 80% of the value of its net assets (plus any borrowings for investment purposes) in securities the interest of which is exempt from Federal income taxes and that do not subject shareholders to the federal alternative minimum tax (“AMT”).  This 80% policy cannot be changed without shareholder approval. The Fund may invest up to 20% of its assets in securities that may fully subject shareholders to Federal income tax, including the AMT.  In addition, all capital gains are subject to Federal and state taxes.  The Fund is non-diversified, which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers.  The Fund may also invest more than 25% of its total assets in municipal bonds that are related in such a way that an economic, business or political development or change affecting one such security could also affect the other securities (for example, securities whose issuers are located in the same state).

Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing in municipal securities issued by states, U.S. territories, and possessions, U.S. Government securities, general obligation securities and revenue securities, including private activity bonds. Municipal securities include state and local general obligation bonds, essential service revenue issues (principally, water and sewer, transportation, public power, combined utilities and public universities), pre-refunded bonds and municipal leases.  Municipal leases are securities that permit government issuers to acquire property and equipment without the security being subject to constitutional and statutory requirements for the issuance of long-term fixed income securities. To enhance yield, the Fund may also invest in selective enterprise revenue and/or private activity issues. The repayment of principal and interest on some of the municipal securities in which the Fund may invest may be guaranteed or insured by a monoline insurance company or other financial institution.  The Fund also may invest in other investment companies, principally money market funds.

The Adviser determines which securities to purchase by first evaluating whether a security falls within the credit guidelines set for the Fund by reviewing the ratings given by a Nationally Recognized Statistical Rating Organization (an “NRSRO”).  Under the credit guidelines, the Fund will hold at least 80% of its total assets in investment grade municipal debt securities, as rated by an NRSRO when purchased, or if unrated, determined by the Adviser to be of comparable quality. The credit guidelines provide that the Fund may also hold up to 20% of its total assets in securities rated below investment grade by an NRSRO or, if not rated, determined to be of equivalent quality by the Adviser. Securities that are rated below investment grade by NRSROs are commonly referred to as “junk bonds.”  Such lower rated securities and other municipal securities may become illiquid due to events relating to the issuer of the securities, market events, economic conditions or investor perceptions.  If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality.

The Adviser then determines the appropriate maturity date and coupon choice after analyzing the current and targeted portfolio structure, and whether or not the issue is fairly priced.  Generally, the average weighted effective maturity of the Fund’s portfolio securities will be between 4 and 10 years.

In determining the municipal securities in which the Fund may invest, the Adviser will use a process for researching securities for purchase that is based on intensive credit research and involves extensive due diligence on each issuer, state, municipality and sector relating to a municipal security.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  These derivative instruments will be counted toward the Fund’s 80% policy to the extent they have economic characteristics similar to the securities included within that policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Adviser may sell a security or reduce its position if:
•Revised economic forecasts or interest rate outlook requires a repositioning of the portfolio;
•The security subsequently fails to meet the investment criteria;
•A more attractive security is found; or
•The Adviser believes that the security has reached its appreciated potential.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Individual issues of municipal obligations may be subject to the credit risk of the municipality.  Therefore, the issuer may experience unanticipated financial problems and may be unable to meet its payment obligations.  Municipal obligations held by the Fund may be adversely affected by political and economic conditions and developments (for example, legislation reducing federal and/or state aid to local governments).  Generally, investment risk and price volatility increase as a security’s credit rating declines. Credit ratings are essentially opinions of the credit quality of an issuer and may prove to be inaccurate.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies (principally, money market funds) in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.
•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Maturity Risk. Generally, a bond with a longer maturity will entail greater interest rate risk but have a higher yield. Conversely, a bond with a shorter maturity will entail less interest rate risk but have a lower yield.

•Municipal Securities Risk. Changes in economic, business or political conditions relating to a particular state, or states, or type of projects may have a disproportionate impact on the Fund. Municipalities continue to experience difficulties in the current economic and political environment. National governmental actions, such as the elimination of tax-exempt status, also could affect performance. In addition, a municipality or municipal project that relies directly or indirectly on national governmental funding mechanisms may be negatively affected by the national government’s current budgetary constraints. Municipal obligations that the Fund may acquire include municipal lease obligations, which are issued by a state or local government or authority to acquire land and a wide variety of equipment and facilities. If the funds are not appropriated for the following year’s lease payments, then the lease may terminate, with the possibility of default on the lease obligation and significant loss to the Fund. The repayment of principal and interest on some of the municipal securities in which the Fund may invest may be guaranteed or insured by a monoline insurance company or other financial institution. If a company insuring municipal securities in which the Fund invests experiences financial difficulties, the credit rating and price of the security may deteriorate. The credit and quality of private activity bonds are usually related to the credit of the corporate user of the facilities and therefore such bonds are subject to the risks of the corporate user. The Fund may invest more heavily in bonds from certain cities, states or regions than others, which may increase the Fund’s exposure to losses resulting from economic, political, or regulatory occurrences impacting these particular cities, states or regions.

•Non-Diversification Risk.  Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Tax Risk. Municipal securities may decrease in value during times when tax rates are falling.  The Fund’s investments are affected by changes in federal income tax rates applicable to, or the continuing federal tax-exempt status of, interest income on municipal obligations.  Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the liquidity, marketability and supply and demand for municipal obligations, which would in turn affect the Fund’s ability to acquire and dispose of municipal obligations at desirable yield and price levels.
•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold.  The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/tax-exempt-bond-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Tax-Exempt Bond Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 2.09% . During the period shown in the chart, the highest quarterly return was 2.82% (for the quarter ended December 31, 2020) and the lowest quarterly return was -3.18% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.09%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.18%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Tax-Exempt Bond Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
NOTE:  The Tax-Exempt Bond Fund offers two classes of shares.  Investor Shares commenced operations on June 29, 2012, and Institutional Shares commenced operations on July 2, 2018.  Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares. 

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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Tax-Exempt Bond Fund | Bloomberg 1-10 Year Blended Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg 1-10 Year Blended Municipal Bond Index   (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 4.23%
5 Years rr_AverageAnnualReturnYear05 2.96%
Since Inception rr_AverageAnnualReturnSinceInception 2.73%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Tax-Exempt Bond Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BTEIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [12]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 42
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 132
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 230
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 518
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.37%
5 Years rr_AverageAnnualReturnYear05 3.72%
Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Tax-Exempt Bond Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [12]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 579
Annual Return 2013 rr_AnnualReturn2013 (1.90%)
Annual Return 2014 rr_AnnualReturn2014 5.53%
Annual Return 2015 rr_AnnualReturn2015 1.41%
Annual Return 2016 rr_AnnualReturn2016 0.62%
Annual Return 2017 rr_AnnualReturn2017 4.92%
Annual Return 2018 rr_AnnualReturn2018 2.16%
Annual Return 2019 rr_AnnualReturn2019 7.48%
Annual Return 2020 rr_AnnualReturn2020 3.42%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.42%
5 Years rr_AverageAnnualReturnYear05 3.69%
Since Inception rr_AverageAnnualReturnSinceInception 2.97%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
Brown Advisory Tax-Exempt Bond Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 3.41%
5 Years rr_AverageAnnualReturnYear05 3.67%
Since Inception rr_AverageAnnualReturnSinceInception 2.94%
Brown Advisory Tax-Exempt Bond Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.07%
5 Years rr_AverageAnnualReturnYear05 3.50%
Since Inception rr_AverageAnnualReturnSinceInception 2.84%
Brown Advisory Tax-Exempt Bond Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [12]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 73
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 227
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 395
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 883
Brown Advisory Tax-Exempt Sustainable Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Tax-Exempt Sustainable Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Tax-Exempt Sustainable Bond Fund (the “Fund”) seeks to provide a high level of current income exempt from Federal income tax by investing primarily in intermediate-term investment grade municipal bonds while giving special consideration to certain environmental, social, and governance (“ESG”) criteria.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 66% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 66.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund will invest at least 80% of the value of its net assets (plus any borrowings for investment purposes) in fixed income securities the interest of which is exempt from Federal income taxes, that do not subject shareholders to the federal alternative minimum tax (“AMT”), and that have either a bond issuer or a use of proceeds of the bond issuance that satisfies the Fund’s Environmental, Social and Governance (“ESG”) criteria.  This 80% policy cannot be changed without shareholder approval. The Fund may invest up to 20% of its assets in securities that may fully subject shareholders to Federal income tax, including the AMT.  In addition, all capital gains are subject to Federal and state taxes.  The Fund is non-diversified, which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers.  The Fund may also invest more than 25% of its total assets in municipal bonds that are related in such a way that an economic, business or political development or change affecting one such security could also affect the other securities (for example, securities whose issuers are located in the same state). Certain of the fixed income securities that the Fund may invest in are often referred to as “Green Bonds”, “Social Bonds”, or “Sustainability Bonds”.

Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing in municipal securities issued by states, U.S. territories, and possessions, U.S. Government securities, general obligation securities and revenue securities, including private activity bonds. Municipal securities include state and local general obligation bonds, essential service revenue issues (principally, water and sewer, transportation, public power, combined utilities and public universities), pre-refunded bonds and municipal leases. The Fund may also invest in private placements in these types of securities.  Municipal leases are securities that permit government issuers to acquire property and equipment without the security being subject to constitutional and statutory requirements for the issuance of long-term fixed income securities.  To enhance yield, the Fund may also invest in selective enterprise revenue and/or private activity issues.  The repayment of principal and interest on some of the municipal securities in which the Fund may invest may be guaranteed or insured by a monoline insurance company (a bond insurer) or other financial institution.  The Fund also may invest in other investment companies, principally money market funds.

The Adviser determines which securities to purchase by first evaluating whether a security falls within the credit guidelines set for the Fund by reviewing the ratings given by a Nationally Recognized Statistical Rating Organization (an “NRSRO”).  Under the credit guidelines, the Fund will hold at least 80% of its total assets in investment grade municipal debt securities, as rated by an NRSRO when purchased, or if unrated, determined by the Adviser to be of comparable quality. The credit guidelines provide that the Fund may also hold up to 20% of its total assets in securities rated below investment grade by an NRSRO or, if not rated, determined to be of equivalent quality by the Adviser. Securities that are rated below investment grade by NRSROs are commonly referred to as “junk bonds.”  Such lower rated securities and other municipal securities may become illiquid due to events relating to the issuer of the securities, market events, economic conditions or investor perceptions.  If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality.

The Adviser then determines the appropriate maturity date and coupon choice after analyzing the current and targeted portfolio structure, and whether or not the issue is fairly priced.  Generally, the average weighted effective maturity of the Fund’s portfolio securities will be between 4 and 10 years.

In determining the municipal securities in which the Fund may invest, the Adviser will use a process for researching securities for purchase that is based on intensive credit research and involves extensive due diligence on each issuer, state, municipality and sector relating to a municipal security.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  These derivative instruments will be counted toward the Fund’s 80% policy to the extent they have economic characteristics similar to the securities included within that policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.
The Adviser utilizes ESG analysis in connection with the Fund's investments in fixed-income securities. ESG factors are considered systematically and comprehensively through leveraging a repeatable process that strives to minimize risk and capture opportunity. As part of the fundamental research approach, the Adviser has a process to integrate, identify and consider the ESG risks and opportunities throughout the investment lifecycle using a proprietary ESG assessment. The Fund has access to this research and considers material ESG issues. The ESG Assessment includes an in-depth ESG Risk Assessment, as well as a Sustainable Opportunity Assessment. The ESG Risk Assessment looks at the issuer's exposure and management of a variety of ESG factors. The Sustainable Opportunity Assessment outlines the positive environmental and social impacts generated by the issuer or individual security. Although qualitative in nature, these assessments include two quantitative scores: an ESG Risk Management Rating and a Sustainable Opportunity Rating. The proprietary ESG ratings framework promotes consistency in how the Adviser thinks about ESG risks and opportunities. A Use of Proceeds Assessment is also conducted for any labeled green, social, or sustainability bonds to assess the impact and determine alignment with International Capital Market Association Principles. The Fund's environmental evaluation considers matters including clean and renewable energy, climate change and water conservation, efficient mass transit and innovative efficiency solutions. The Fund's social evaluation factors focus on matters including economic impact, high quality safety-net healthcare and overall community health needs, and the reduction of achievement gaps between school districts. The Fund's governance evaluation considers matters including stewardship of debt and capital, board governance and transparency. The outcomes of this process may result in positive environmental and social impacts. While not a thematic fund in nature, the nature of the Adviser's ESG research process has an output on important sustainable investing themes, such as responsible water management, accessibility of essential services like healthcare, transportation, education, and climate mitigation.

•The Adviser may sell a security or reduce its position if:
•Revised economic forecasts or interest rate outlook requires a repositioning of the portfolio;
•The security subsequently fails to meet the investment criteria;
•A more attractive security is found;
•The Adviser believes that the security has reached its appreciated potential; or
•The investment no longer meets the Fund’s ESG criteria.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.  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.  The Fund’s principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.  The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Individual issues of municipal obligations may be subject to the credit risk of the municipality.  Therefore, the issuer may experience unanticipated financial problems and may be unable to meet its payment obligations.  Municipal obligations held by the Fund may be adversely affected by political and economic conditions and developments (for example, legislation reducing federal and/or state aid to local governments).  Generally, investment risk and price volatility increase as a security’s credit rating declines. Credit ratings are essentially opinions of the credit quality of an issuer and may prove to be inaccurate.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss
of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Environmental, Social and Governance Policy Risk. The risk that because the Fund’s ESG criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies (principally, money market funds) in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Maturity Risk. Generally, a bond with a longer maturity will entail greater interest rate risk but have a higher yield. Conversely, a bond with a shorter maturity will entail less interest rate risk but have a lower yield.

•Municipal Securities Risk. Changes in economic, business or political conditions relating to a particular state, or states, or type of projects may have a disproportionate impact on the Fund. Municipalities continue to experience difficulties in the current economic and political environment. National governmental actions, such as the elimination of tax-exempt status, also could affect performance. In addition, a municipality or municipal project that relies directly or indirectly on national governmental funding mechanisms may be negatively affected by the national government’s current budgetary constraints. Municipal obligations that the Fund may acquire include municipal lease obligations, which are issued by a state or local government or authority to acquire land and a wide variety of equipment and facilities. If the funds are not appropriated for the following year’s lease payments, then the lease may terminate, with the possibility of default on the lease obligation and significant loss to the Fund. The repayment of principal and interest on some of the municipal securities in which the Fund may invest may be guaranteed or insured by a monoline insurance company (a bond insurer) or other financial institution. If a company insuring municipal securities in which the Fund invests experiences financial difficulties, the credit rating and price of the security may deteriorate. The credit and quality of private activity bonds are usually related to the credit of the corporate user of the facilities and therefore such bonds are subject to the risks of the corporate user. The Fund may invest more heavily in bonds from certain cities, states or regions than others, which may increase the Fund’s exposure to losses resulting from economic, political, or regulatory occurrences impacting these particular cities, states or regions.
•New Fund Risk.  The Fund is new with a limited operating history and there can be no assurance that the Fund will grow to or maintain an economically viable size.

•Non-Diversification Risk.  Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.

•Non-Investment Grade (“Junk Bond”) Securities Risk. Securities rated below investment grade, i.e., Ba or BB and lower (“junk bonds”), are subject to greater risks of loss of your money than higher rated securities. Compared with issuers of investment grade fixed-income securities, junk bonds are more likely to encounter financial difficulties and to be materially affected by these difficulties.

•Private Placement Risk. The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Rating Agencies Risk. Ratings are not an absolute standard of quality, but rather general indicators that reflect only the view of the originating rating agencies from which an explanation of the significance of such ratings may be obtained. There is no assurance that a particular rating will continue for any given period of time or that any such rating will not be revised downward or withdrawn entirely if, in the judgment of the agency establishing the rating, circumstances so warrant. A downward revision or withdrawal of such ratings, or either of them, may have an effect on the liquidity or market price of the securities in which the Fund invests. The ratings of securitized assets may not adequately reflect the credit risk of those assets due to their structure.

•Sustainability Policy Risk. The Fund’s investment focus on sustainability factors could cause it to make or avoid investments that could result in the Fund underperforming similar funds that do not have a sustainability focus.

•Tax Risk. Municipal securities may decrease in value during times when tax rates are falling.  The Fund’s investments are affected by changes in federal income tax rates applicable to, or the continuing federal tax-exempt status of, interest income on municipal obligations.  Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the liquidity, marketability and supply and demand for municipal obligations, which would in turn affect the Fund’s ability to acquire and dispose of municipal obligations at desirable yield and price levels.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold.  The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Investment by the Fund in securities of a limited number of issuers exposes the Fund to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The chart shows the Fund’s performance of Investor Shares for one year. The table shows how the average annual returns of Investor Shares for the 1 year and since inception period compared to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.https://www.brownadvisory.com/mf/funds/tax-exempt-sustainable-bond-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Tax-Exempt Sustainable Bond Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 1.83%. During the period shown in the chart, the highest quarterly return was 1.69% (for the quarter ended December 31, 2020) and the lowest quarterly return was -1.62% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.83%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.69%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.62%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Tax-Exempt Sustainable Bond Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Brown Advisory Tax-Exempt Sustainable Bond Fund | Bloomberg 1-10 Year Blended Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg 1-10 Year Blended Municipal Bond Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 4.23%
Since Inception rr_AverageAnnualReturnSinceInception 4.26%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 02, 2019
Brown Advisory Tax-Exempt Sustainable Bond Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 45
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 141
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 246
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 555
Brown Advisory Tax-Exempt Sustainable Bond Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BITEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.49%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 157
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 274
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 616
Annual Return 2020 rr_AnnualReturn2020 2.07%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.07%
Since Inception rr_AverageAnnualReturnSinceInception 2.10%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 02, 2019
Brown Advisory Tax-Exempt Sustainable Bond Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.04%
Since Inception rr_AverageAnnualReturnSinceInception 2.06%
Brown Advisory Tax-Exempt Sustainable Bond Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 1.79%
Since Inception rr_AverageAnnualReturnSinceInception 1.90%
Brown Advisory Tax-Exempt Sustainable Bond Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 76
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 237
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 411
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 918
Brown Advisory Mortgage Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Mortgage Securities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Mortgage Securities Fund (the “Fund”) seeks to maximize total return consistent with preservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 148% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 148.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, Brown Advisory LLC (the “Adviser”) seeks to achieve the Fund’s investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in investment grade mortgage-related securities. Mortgage-related securities consist of mortgage-backed securities (“MBS”) such as residential mortgage-backed securities (“RMBS”), commercial mortgage-backed securities (“CMBS”), stripped mortgage-backed securities (“SMBS”), collateralized mortgage obligations (“CMOs”), inverse floating rate obligations and other similar types of securities representing an interest in or that are secured by mortgages. The Fund may also engage in “To Be Announced” transactions and it may invest in municipal housing bonds and other investment companies. The Fund invests in securities of various maturities and durations.

The Fund will hold at least 80% of its total assets in investment grade mortgage-related securities, that is, securities rated in the top four ratings categories as rated at the time of purchase by a Nationally Recognized Statistical Rating Organization (an “NRSRO”), or if unrated, as determined by the Adviser to be of comparable quality. The Fund may also hold up to 20% of its total assets in securities that are rated below investment grade by an NRSRO or, if not rated, determined to be of equivalent quality by the Adviser. Securities that are rated below investment grade by independent rating agencies are commonly referred to as “junk bonds.” If independent rating agencies assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality.

The Fund may invest in derivatives instruments, such as options, futures contracts, including interest rate futures, and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances.  These derivative instruments will be counted toward the Fund’s 80% policy to the extent they have economic characteristics similar to the securities included within that policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Adviser may sell a security or reduce its position if:
•Revised economic outlook requires a repositioning of the portfolio or alters the risk/reward of a given security
•Changes in a security’s composition, such as faster or slower prepayments than expected, alter its risk/reward balance to an unfavorable position
•A more attractive security is found or
•The Adviser believes the security has reached its appreciation potential.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.

•Debt/Fixed Income Securities Risk. An increase in interest rates typically causes a fall in the value of the debt securities in which the Fund may invest. The value of your investment in the Fund may change in response to changes in the credit
ratings of the Fund’s portfolio of debt securities. Interest rates in the United States are at, or near, historic lows, which may increase the Fund’s exposure to risks associated with rising interest rates. Moreover, rising interest rates or lack of market participants may lead to decreased liquidity in the bond and loan markets, making it more difficult for the Fund to sell its holdings at a time when the Fund’s manager might wish to sell. Lower rated securities (“junk bonds”) are generally subject to greater risk of loss of your money than higher rated securities. Issuers may (increase) decrease prepayments of principal when interest rates (fall) increase, affecting the maturity of the debt security and causing the value of the security to decline.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Interest Rate Risk. An increase in interest rates typically causes a fall in the value of the fixed income securities in which the Fund may invest. Interest rates currently are at, or near, historic lows, and may increase, with potentially sudden and unpredictable effects on the markets and the Fund’s investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies (principally, money market funds) in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Adviser would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Adviser’s success or failure to implement investment strategies for the Fund.

•Market Risk. The portfolio securities held by the Fund are susceptible to general market fluctuations and to volatile increases and decreases in value. The securities markets may experience declines and the holdings in the Fund’s portfolio may not increase their earnings at the rate anticipated.

•Mortgage-Related Securities Risk. Mortgage-related securities are subject to prepayment risk as well as the risks associated with investing in debt securities in general. If interest rates fall and the loans underlying these securities are prepaid faster than expected, the Fund may have to reinvest the prepaid principal in lower yielding securities, thus reducing the Fund’s income. Conversely, if interest rates increase and the loans underlying the securities are prepaid more slowly than expected, the expected duration of the securities may be extended, reducing the cash flow for potential reinvestment in higher yielding securities.
•Municipal Securities Risk. Adverse economic or political factors in the municipal bond market, including changes in the tax law, could impact the Fund in a negative manner.

•Non-Investment Grade ("Junk Bond") Securities Risk. Below investment grade debt securities (also known as “junk bonds”) are speculative and involve a greater risk of default and price change due to changes in the issuer’s creditworthiness. The market prices of these debt securities may fluctuate more than the market prices of investment grade debt securities and may decline significantly in periods of general economic difficulty.
•Portfolio Turnover Risk. High portfolio turnover involves correspondingly greater expenses to a Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestments in other securities. Higher portfolio turnover also may result in higher taxes when Fund shares are held in a taxable account.

•Prepayment/Extension Risk. Issuers may experience an acceleration in prepayments of mortgage loans or other receivables backing the issuers’ fixed income securities when interest rates decline, which can shorten the maturity of the security, force the Fund to invest in securities with lower interest rates, and reduce the Fund’s return. Issuers may decrease prepayments of principal when interest rates increase, extending the maturity of a fixed income security and causing the value of the security to decline.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•Rating Agencies Risk. Ratings are not an absolute standard of quality, but rather general indicators that reflect only the view of the originating rating agencies from which an explanation of the significance of such ratings may be obtained. There is no assurance that a particular rating will continue for any given period of time or that any such rating will not be revised downward or withdrawn entirely if, in the judgment of the agency establishing the rating, circumstances so warrant. A downward revision or withdrawal of such ratings, or either of them, may have an effect on the liquidity or market price of the securities in which the Fund invests. The ratings of securitized assets may not adequately reflect the credit risk of those assets due to their structure.

•To Be Announced (“TBA”) Transactions Risk.  The Fund may enter into TBA transactions to purchase mortgage-related securities for a fixed price at a future date. TBA purchase commitments involve a risk of loss if the value of the security to be purchased declines prior to settlement date or if the counterparty does not deliver the securities as promised.

•U.S. Government Securities Risk. Although the Fund’s U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Some obligations issued or guaranteed by U.S. Government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. Government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. Government provides financial support to such U.S. Government-sponsored federal agencies, no assurance can be given that the U.S. Government will always do so, since the U.S. Government is not so obligated by law.
•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index. Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/mortgage-securities-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Mortgage Securities Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 0.21%. During the period shown in the chart, the highest quarterly return was 2.49% (for the quarter ended March 31, 2019) and the lowest quarterly return was -2.71% (for the quarter ended December 31, 2016).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.71%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Mortgage Securities Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock NOTE:  The Mortgage Securities Fund offers two classes of shares.  Investor Shares commenced operations on December 26, 2013 and Institutional Shares commenced operations on May 13, 2014.  Performance shown prior to inception of the Institutional Shares is based on the performance of Investor Shares, adjusted for the lower expenses applicable to Institutional Shares.  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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Brown Advisory Mortgage Securities Fund | Bloomberg Mortgage Backed Securities Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg Mortgage Backed Securities Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 3.87%
5 Years rr_AverageAnnualReturnYear05 3.05%
Since Inception rr_AverageAnnualReturnSinceInception 3.28%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 26, 2013
Brown Advisory Mortgage Securities Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFZX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [13]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 579
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.54%
5 Years rr_AverageAnnualReturnYear05 3.35%
Since Inception rr_AverageAnnualReturnSinceInception 3.31%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 26, 2013
Brown Advisory Mortgage Securities Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAZX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [13]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.51%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 52
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 164
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 285
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 640
Annual Return 2014 rr_AnnualReturn2014 4.02%
Annual Return 2015 rr_AnnualReturn2015 2.29%
Annual Return 2016 rr_AnnualReturn2016 1.24%
Annual Return 2017 rr_AnnualReturn2017 2.35%
Annual Return 2018 rr_AnnualReturn2018 0.73%
Annual Return 2019 rr_AnnualReturn2019 6.93%
Annual Return 2020 rr_AnnualReturn2020 5.49%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.49%
5 Years rr_AverageAnnualReturnYear05 3.32%
Since Inception rr_AverageAnnualReturnSinceInception 3.26%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 26, 2013
Brown Advisory Mortgage Securities Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.07%
5 Years rr_AverageAnnualReturnYear05 2.38%
Since Inception rr_AverageAnnualReturnSinceInception 2.21%
Brown Advisory Mortgage Securities Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.25%
5 Years rr_AverageAnnualReturnYear05 2.12%
Since Inception rr_AverageAnnualReturnSinceInception 2.03%
Brown Advisory Mortgage Securities Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [13]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 243
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 942
Brown Advisory - WMC Strategic European Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory – WMC Strategic European Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory − WMC Strategic European Equity Fund (the “Fund”) seeks to achieve total return by investing principally in equity securities issued by companies established or operating in Europe.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 51% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 51.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Brown Advisory − WMC Strategic European Equity Fund seeks to achieve its investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of companies which are domiciled in or exercise the predominant part of their economic activity in Europe – defined as countries included in the MSCI Europe Index.

In determining whether a company is domiciled in or exercises the predominant part of its economic activity in Europe, the Fund will consider any one of the following four factors when making its determination: (i) country of organization; (ii) primary securities trading market; (iii) location of assets; or (iv) country where the company derives at least half of its revenue or profits. As of September 30, 2021, the following countries were included in the MSCI Europe Index: Austria, Belgium, Denmark, Finland, France, Germany, Ireland, Italy, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.

The Fund may purchase equity securities of companies of any size capitalization. Equity securities in which the Fund may invest include common stock, preferred stock, equity-equivalent securities such as stock futures contracts or convertible securities, equity options, other investment companies, American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), real estate investment trusts (“REITs”) and exchange traded funds (“ETFs”).

The Fund may invest up to 20% of its net assets in securities of companies that are established or operating in countries that are considered to be outside of Europe, which may include less developed and emerging markets countries as well as other developed market countries.

The Fund may utilize options, futures contracts, currency forwards, swaps and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances. The Fund may also invest in participatory notes which are instruments that are used to replicate the performance of certain underlying issuers and markets. By investing in derivatives, the Fund attempts to achieve the economic equivalence it would achieve if it were to invest directly in the underlying security. Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Fund may sell its portfolio securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the
deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Currency and Exchange Rate Risk. Investments in currencies, currency futures contracts, forward currency exchange contracts or similar instruments, as well as securities that are denominated in foreign currency, are subject to the risk that the value of a particular currency will change in relation to one or more other currencies. In addition, the Fund may engage in currency hedging transactions. Currency hedging transactions are subject to the risk that a result opposite expectations occurs (an expected decline turns into a rise and conversely) resulting in a loss to the Fund.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.
•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations.
•European Securities Risk. Because a significant portion of the assets of the Fund are invested in European securities, the Fund’s performance is expected to be impacted by the political, social and economic environment within Europe. As such, the Fund’s performance may be more volatile than the performance of funds that are more geographically diverse.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Large Investor Risk. Ownership of shares of the Fund may be concentrated in one or more large investors. These investors may redeem shares in substantial quantities or on a frequent basis, which may negatively impact the Fund’s performance, may increase realized capital gains, may accelerate the realization of taxable income to other shareholders and may potentially limit the use of available capital loss carryforwards or certain other losses to offset any future realized capital gains. Large investor redemption activity also may increase the Fund’s brokerage and other expenses.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Fund would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Smaller and Medium Capitalization Company Risk. Securities of smaller and medium sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of smaller companies may decline more in response to selling pressures.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the
prices at which securities are actually bought and sold. The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns for Investor Shares, Advisor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index.
Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/wmc-strategic-european-equity-fund or by calling 800-540-6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-540-6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory – WMC Strategic European Equity Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 10.20%. During the period shown in the chart, the highest quarterly return was 19.63% (for the quarter ended June 30, 2020) and the lowest quarterly return was -22.13% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.20%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.63%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.13%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory – WMC Strategic European Equity Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory - WMC Strategic European Equity Fund | MSCI Europe Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI Europe Index (reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 5.38%
5 Years rr_AverageAnnualReturnYear05 6.78%
Since Inception rr_AverageAnnualReturnSinceInception 3.86%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 2013
Brown Advisory - WMC Strategic European Equity Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFHX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel •Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.32%
5 Years rr_AverageAnnualReturnYear05 8.38%
Since Inception rr_AverageAnnualReturnSinceInception 6.19%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 2013
Brown Advisory - WMC Strategic European Equity Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAHX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.20%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 122
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 381
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 660
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,455
Annual Return 2014 rr_AnnualReturn2014 (5.09%)
Annual Return 2015 rr_AnnualReturn2015 6.05%
Annual Return 2016 rr_AnnualReturn2016 (2.28%)
Annual Return 2017 rr_AnnualReturn2017 32.36%
Annual Return 2018 rr_AnnualReturn2018 (16.49%)
Annual Return 2019 rr_AnnualReturn2019 23.52%
Annual Return 2020 rr_AnnualReturn2020 11.29%
Label rr_AverageAnnualReturnLabel •Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.29%
5 Years rr_AverageAnnualReturnYear05 8.23%
Since Inception rr_AverageAnnualReturnSinceInception 6.04%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 2013
Brown Advisory - WMC Strategic European Equity Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel •Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.84%
5 Years rr_AverageAnnualReturnYear05 7.17%
Since Inception rr_AverageAnnualReturnSinceInception 5.30%
Brown Advisory - WMC Strategic European Equity Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel •Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.97%
5 Years rr_AverageAnnualReturnYear05 6.50%
Since Inception rr_AverageAnnualReturnSinceInception 4.81%
Brown Advisory - WMC Strategic European Equity Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAHAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 148
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 459
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 792
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,735
Label rr_AverageAnnualReturnLabel •Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.96%
5 Years rr_AverageAnnualReturnYear05 7.96%
Since Inception rr_AverageAnnualReturnSinceInception 5.78%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 2013
Brown Advisory Emerging Markets Select Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory Emerging Markets Select Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory Emerging Markets Select Fund (the “Fund”) seeks to achieve total return by investing principally in equity securities issued by companies established or operating in emerging markets.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 61% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 61.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Fund seeks to achieve its investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities issued by companies that are established or operating in emerging market countries. These will consist of companies in emerging market countries in Latin America, Asia, Eastern Europe, Africa, and the Middle East. The Fund intends to invest primarily in the following countries (others may be added as markets in other countries develop):
•Asia: China, Hong Kong, India, Indonesia, Malaysia, Pakistan, Philippines, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam.
•Latin America: Argentina, Belize, Brazil, Chile, Colombia, Mexico, Panama, Peru, and Venezuela.
•Eastern Europe: Croatia, Czech Republic, Estonia, Hungary, Kazakhstan, Latvia, Lithuania, Poland, Romania, Russia, Slovakia, Slovenia, Turkey, and Ukraine.
•Africa and the Middle East: Bahrain, Botswana, Egypt, Israel, Jordan, Kenya, Kuwait, Lebanon, Mauritius, Morocco, Nigeria, Oman, Qatar, Saudi Arabia, South Africa, Tunisia, United Arab Emirates, and Zimbabwe.

The Fund may purchase equity securities of companies of any size capitalization. Equity securities in which the Fund may invest include common stock, preferred stock, equity-equivalent securities such as convertible securities, stock futures contracts, equity options, other investment companies, American Depositary Receipts ("ADRs"), European Depositary Receipts ("EDRs"), Global Depositary Receipts ("GDRs"), Non-Voting Depositary Receipts ("NVDRs"), real estate investment trusts ("REITs") and exchange traded funds ("ETFs"), and the Fund may also invest in fixed income securities and private placements.

The Fund considers a company to be established or operating in emerging market countries if: (i) it is organized under the laws of or maintains its principal office in an emerging market country; (ii) its securities are principally traded on trading markets in emerging markets countries; (iii) it derives at least 50% of its total revenue or profits from either goods or services produced or sales made in emerging markets countries; or (iv) it has at least 50% of its assets in emerging market countries.

The Fund may invest up to 20% of its net assets in securities of companies that are established or operating in countries that are considered to be outside of emerging markets, which may include other less developed countries as well as developed market countries. Such less developed countries share many similar attributes with emerging markets countries, however, their markets are not yet considered to be as developed as those in the emerging markets.

The Fund may utilize rights, warrants, options, futures contracts and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances. The Fund may also invest in Contracts for Difference or participatory notes which are instruments that are used to replicate the performance of certain underlying issuers and markets. By investing in derivatives, the Fund attempts to achieve the economic equivalence it would achieve if it were to invest directly in the underlying security. Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Fund may invest up to 20% of its net assets in fixed income securities.

The Fund may sell its portfolio securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments.  A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance.  The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) and Global Depository Receipts (“GDRs”) Risk. ADRs and GDRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through. GDRs can involve currency risk since, unlike ADRs, they may not be U.S. dollar-denominated.

•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Credit Risk. The value of your investment in the Fund may change in response to changes in the credit ratings of the Fund’s portfolio securities. Generally, investment risk and price volatility increase as a security’s credit rating declines. The financial condition of an issuer of a fixed income security held by a Fund may cause it to default or become unable to pay interest or principal due on the security.

•Currency and Exchange Rate Risk. Investments in currencies, currency futures contracts, forward currency exchange contracts or similar instruments, as well as securities that are denominated in foreign currency, are subject to the risk that the value of a particular currency will change in relation to one or more other currencies. In addition, the Fund may engage in currency hedging transactions. Currency hedging transactions are subject to the risk that a result opposite expectations occurs (an expected decline turns into a rise and conversely) resulting in a loss to the Fund.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Emerging Markets Risk. The Fund may invest in emerging markets, which may carry more risk than investing in developed foreign markets. Risks associated with investing in emerging markets include limited information about companies in these countries, greater political and economic uncertainties compared to developed foreign markets, underdeveloped securities markets and legal systems, potentially high inflation rates, and the influence of foreign governments over the private sector. In addition, companies in emerging market countries may not be subject to accounting, auditing, financial reporting and recordkeeping requirements that are as robust as those in more developed countries, and therefore, material information about a company may be unavailable or unreliable, and U.S. regulators may be unable to enforce a company’s regulatory obligations. Emerging markets countries are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility. Investors should be able to tolerate sudden, sometimes substantial, fluctuations in the value of their
investments. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors from withdrawing their money at will.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Geographic Focus Risk. To the extent that the Fund focuses its investments in a particular geographic region or country, the Fund may be subject to increased currency, political, regulatory and other risks relating to such region or country. As a result, the Fund may be subject to greater price volatility and risk of loss than a fund holding more geographically diverse investments.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Liquidity Risk. Certain securities held by the Fund may be difficult (or impossible) to sell at the time and at the price the Fund would like. As a result, the Fund may have to hold these securities longer than it would like and may forego other investment opportunities. There is the possibility that the Fund may lose money or be prevented from realizing capital gains if it cannot sell a security at a particular time and price.

•Management Risk. The Fund may not meet its investment objective based on the Sub-Advisers' success or failure to implement investment strategies for the Fund.
•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Smaller and Medium Capitalization Company Risk. Securities of smaller and medium sized companies may be more volatile and more difficult to liquidate during market down turns than securities of larger companies. Additionally the price of smaller companies may decline more in response to selling pressures.

•Valuation Risk. The prices provided by the Fund’s pricing services or independent dealers or the fair value determinations made by the valuation committee of the Adviser may be different from the prices used by other mutual funds or from the prices at which securities are actually bought and sold.  The prices of certain securities provided by pricing services may be subject to frequent and significant change, and will vary depending on the information that is available.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of the Investor Shares, Advisor Shares and Institutional Shares for the 1 year, 5 year, and since inception periods compare to a broad-based market index. Prior to February 23, 2019, the Fund engaged a different, sole investment sub-adviser and operated subject to different principal investment strategies. As a result, the performance prior to February 23, 2019 is attributable to the former investment sub-adviser and different principal investment strategies.Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/emerging-markets-select-fund or by calling 800‑540‑6807 (toll free).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑540‑6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory Emerging Markets Select Fund – Investor Shares Annual Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 2.31%. During the period shown in the chart, the highest quarterly return was 21.39% (for the quarter ended December 31, 2020) and the lowest quarterly return was -24.85% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.31%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.85%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory Emerging Markets Select Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary.
Brown Advisory Emerging Markets Select Fund | FTSE Emerging Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel FTSE Emerging Index(reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 15.12%
5 Years rr_AverageAnnualReturnYear05 12.36%
Since Inception rr_AverageAnnualReturnSinceInception 5.15%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 12, 2012
Brown Advisory Emerging Markets Select Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAFQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [14]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 622
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,375
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.60%
5 Years rr_AverageAnnualReturnYear05 9.01%
Since Inception rr_AverageAnnualReturnSinceInception 3.50%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 12, 2012
Brown Advisory Emerging Markets Select Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [14]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.28%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 130
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 406
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 702
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,545
Annual Return 2013 rr_AnnualReturn2013 (3.90%)
Annual Return 2014 rr_AnnualReturn2014 (0.34%)
Annual Return 2015 rr_AnnualReturn2015 (12.32%)
Annual Return 2016 rr_AnnualReturn2016 4.61%
Annual Return 2017 rr_AnnualReturn2017 32.77%
Annual Return 2018 rr_AnnualReturn2018 (20.51%)
Annual Return 2019 rr_AnnualReturn2019 16.75%
Annual Return 2020 rr_AnnualReturn2020 18.34%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.34%
5 Years rr_AverageAnnualReturnYear05 8.81%
Since Inception rr_AverageAnnualReturnSinceInception 3.33%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 12, 2012
Brown Advisory Emerging Markets Select Fund | Investor Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.42%
5 Years rr_AverageAnnualReturnYear05 8.78%
Since Inception rr_AverageAnnualReturnSinceInception 3.30%
Brown Advisory Emerging Markets Select Fund | Investor Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.15%
5 Years rr_AverageAnnualReturnYear05 7.23%
Since Inception rr_AverageAnnualReturnSinceInception 2.83%
Brown Advisory Emerging Markets Select Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BAQAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [14]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 156
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 483
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 834
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,824
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.03%
5 Years rr_AverageAnnualReturnYear05 8.54%
Since Inception rr_AverageAnnualReturnSinceInception 3.06%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 12, 2012
Brown Advisory - Beutel Goodman Large-Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Brown Advisory – Beutel Goodman Large-Cap Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Brown Advisory – Beutel Goodman Large-Cap Value Fund (the “Fund”) seeks to achieve capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 portfolio turnover rate for the Fund was 42% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 42.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% annual return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Fund seeks to achieve its investment objective by investing at least 80% of the value of its net assets (plus any borrowings for investment purposes) in equity securities of large-cap companies. The Fund considers large-cap companies to be those with market capitalizations greater than $5 billion at the time of purchase. 

The Fund seeks to invest in companies at discounts to their business value, which the Fund considers to be the present value of sustainable free cash flow. To identify these investment opportunities, the Fund employs a disciplined, bottom-up investment process highlighted by rigorous, internally-generated fundamental research. Accordingly, investments are made only when the Fund believes there is a sufficient discount to business value to mitigate the loss of capital in the event of adverse circumstances.

Equity securities in which the Fund may invest include common and preferred stock, convertible debt securities, American Depositary Receipts (“ADRs”), real estate investment trusts (“REITs”), exchange traded funds (“ETFs”), and other types of investment companies.  The Fund may also invest in private placements in these types of securities.  The Fund may invest in ETFs and other types of investment companies that have an investment objective similar to the Fund’s or that otherwise are permitted investments with the Fund’s investment policies described herein.  ADRs are equity securities traded on U.S. securities exchanges, which are generally issued by banks or trust companies to evidence ownership of foreign equity securities.  The Fund may invest up to 20% of its net assets in foreign securities. The Fund is non-diversified, which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers.  

The Fund may utilize options, futures contracts and options on futures. These investments will typically be made for investment purposes consistent with the Fund’s investment objective and may also be used to mitigate or hedge risks within the portfolio or for the temporary investment of cash balances. By investing in derivatives, the Fund attempts to achieve the economic equivalence it would achieve if it were to invest directly in the underlying security. Investments in derivatives may be counted towards the Fund’s 80% investment policy if they have economic characteristics similar to the other investments that are included in the Fund’s 80% investment policy. The Fund intends to use the mark-to-market value of such derivatives for purposes of complying with the Fund’s 80% investment policy.

The Fund may sell a security or reduce its position if it believes:
•The security subsequently fails to meet initial investment criteria;
•A more attractively priced security is found; or
•The security becomes overvalued relative to the long-term expectation.

In order to respond to adverse market, economic, political, or other conditions, the Fund may assume a temporary defensive position that is inconsistent with its investment objective and principal investment strategy and invest without limit in cash and prime quality cash equivalents such as prime commercial paper and other money market instruments. A defensive position, taken at the wrong time, may have an adverse impact on the Fund’s performance. The Fund may be unable to achieve its investment objective during the employment of a temporary defensive measure.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund. 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. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears. The following are the principal risks that could affect the value of your investment:

•American Depositary Receipts (“ADRs”) Risk. ADRs may be subject to some of the same risks as direct investment in foreign companies, which includes international trade, currency, political, regulatory and diplomatic risks. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. Because unsponsored ADR arrangements are organized independently and without the cooperation of the issuer of the underlying securities, available information concerning the foreign issuer may not be as current as for sponsored ADRs and voting rights with respect to the deposited securities are not passed through.
•Convertible Securities Risk. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with fluctuations in the market value of the underlying securities.

•Derivatives Risk. The risk that an investment in derivatives will not perform as anticipated, cannot be closed out at a favorable time or price, or will increase the Fund’s volatility; that derivatives may create investment leverage; that, when a derivative is used as a substitute or alternative to a direct cash investment, the transaction may not provide a return that corresponds precisely with that of the cash investment; that a derivative will not perform in the manner anticipated by the Adviser, which may result in losses that partially or completely offset gains in portfolio positions; or that, when used for hedging purposes, derivatives will not provide the anticipated protection, causing the Fund to lose money on both the derivatives transaction and the exposure the Fund sought to hedge. Additionally, any derivatives held by the Fund will have counterparty associated risks, which are the risks that the other party to the derivative contract, which may be a derivatives exchange, will fail to make required payments or otherwise fail to comply with the terms of the contract. The Fund potentially could lose all or a large portion of its investment in the derivative instrument.

•Equity and General Market Risk. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The stock market may experience declines or stocks in the Fund’s portfolio may not increase their earnings at the rate anticipated. The Fund’s NAV and investment return will fluctuate based upon changes in the value of its portfolio securities. Markets may, in response to economic or market developments, governmental actions or intervention, natural disasters, epidemics, pandemics or other external factors, experience periods of high volatility and reduced liquidity. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities, particularly fixed income securities, may be difficult to value during such periods.

•ETF Risk. ETFs may trade at a discount to the aggregate value of the underlying securities and although expense ratios for ETFs are generally low, frequent trading of ETFs by the Fund can generate brokerage expenses. Shareholders of the Fund will indirectly be subject to the fees and expenses of the individual ETFs in which the Fund invests.

•Foreign Securities Risk. The Fund may invest in foreign securities and is subject to risks associated with foreign markets, such as adverse political, social and economic developments such as war, political instability, hyperinflation, currency devaluations, and overdependence on particular industries; accounting standards or governmental supervision that is not consistent with that to which U.S. companies are subject; limited information about foreign companies; less liquidity and higher volatility in foreign markets and less protection to the shareholders in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. The value of the Fund’s foreign investments may also be affected by foreign tax laws, special U.S. tax considerations and restrictions on receiving the investment proceeds from a foreign country. Dividends or interest on, or proceeds from the sale or disposition of, foreign securities may be subject to non-U.S. withholding or other taxes. Economic sanctions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund’s investments in such securities harder to value.

•Investments in Other Investment Companies Risk. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests, and these fees and expenses are in addition to the fees and expenses that Fund shareholders directly bear in connection with the Fund’s own operations. In addition, shareholders will be exposed to the investment risks associated with investments in the other investment companies.

•Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large capitalization companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk. The Fund may not meet its investment objective based on the Sub-Adviser’s success or failure to implement investment strategies for the Fund.
•Non-Diversification Risk.  Investment by the Fund in securities of a limited number of issuers exposes it to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.

•Private Placement Risk. The Fund may invest in privately issued securities of domestic common and preferred stock, convertible debt securities, ADRs and REITs, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Privately issued securities are restricted securities that are not publicly traded. Delay or difficulty in selling such securities may result in a loss to the Fund.

•REIT and Real Estate Risk. The value of the Fund’s investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. In connection with the Fund’s investments in REITs, the Fund is also subject to risks associated with extended vacancies of properties or defaults by borrowers or tenants, particularly during periods of disruptions to business operations or an economic downturn.

•Value Company Risk. The stock of value companies can continue to be undervalued for long periods of time and not realize its expected value.  The value of the Fund may decrease in response to the activities and financial prospects of an individual company.
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, there is the risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Investment by the Fund in securities of a limited number of issuers exposes it to greater market risk and potential monetary losses than if its assets were diversified among the securities of a greater number of issuers.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Fund. The chart shows the Fund’s performance of Institutional Shares from year-to-year. The table shows how the average annual returns of Institutional Shares for the 1 year and since inception periods compare to a broad-based market index. No performance information is shown for Investor Shares as Investor Shares had not commenced operations prior to December 31, 2020.

Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. Updated performance information is available online at www.brownadvisory.com/mf/beutel-goodman-large-cap-value-fund or by calling 800-540-6807 (toll free) or 414-203-9064.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-540-6807
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.brownadvisory.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results.
Bar Chart [Heading] rr_BarChartHeading Brown Advisory - Beutel Goodman Large-Cap Value Fund – Institutional Shares Annual Total Return
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The Fund’s calendar year-to-date total return as of September 30, 2021 was 12.06%. During the period shown in the chart, the highest quarterly return was 15.83% (for the quarter ended June 30, 2020) and the lowest quarterly return was -20.42% (for the quarter ended March 31, 2020).
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 12.06%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.83%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.42%)
Performance Table Heading rr_PerformanceTableHeading Brown Advisory - Beutel Goodman Large-Cap Value Fund Average Annual Total Returns
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses and taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Shares only. After-tax returns for Advisor Shares and Investor Shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Shares only. After-tax returns for Advisor Shares and Investor Shares will vary.
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000® Value Index(reflects no deduction for fees, expenses and taxes)
1 Year rr_AverageAnnualReturnYear01 2.80%
Since Inception rr_AverageAnnualReturnSinceInception 7.12%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2018
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BVALX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.45%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 307
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 689
Annual Return 2019 rr_AnnualReturn2019 29.90%
Annual Return 2020 rr_AnnualReturn2020 11.51%
Label rr_AverageAnnualReturnLabel –Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.51%
Since Inception rr_AverageAnnualReturnSinceInception 10.58%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2018
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Institutional Shares | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 10.69%
Since Inception rr_AverageAnnualReturnSinceInception 9.85%
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Institutional Shares | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel –Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.39%
Since Inception rr_AverageAnnualReturnSinceInception 8.09%
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BIAVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.45%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 224
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 871
Brown Advisory - Beutel Goodman Large-Cap Value Fund | Advisor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.45%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 525
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,166
[1] Brown Advisory LLC (the "Adviser") has contractually agreed to waive its fees and/or reimburse certain expenses (exclusive of any front-end or contingent deferred sales loads, taxes, interest, brokerage commissions, acquired fund fees and expenses, expenses incurred in connection with any merger or reorganization and extraordinary expenses) in order to limit the Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement for Institutional Shares, Investor Shares and Advisor Shares to 0.76%, 0.91% and 1.16%, respectively, of the Fund’s average daily net assets through October 31, 2022. The Fund may have Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement higher than these expense caps as a result of any acquired fund fees and expenses or other expenses that are excluded from the calculation. The contractual waivers and expense reimbursements may be changed or eliminated at any time by the Board of Trustees, on behalf of the Fund, upon 60 days written notice to the Adviser. The contractual waivers and expense reimbursements may not be terminated by the Adviser without the consent of the Board of Trustees. The Adviser may recoup any waived amount from the Fund pursuant to this agreement if such reimbursement does not cause the Fund to exceed existing expense limitations or the limitations in place at the time the reduction was originally made and the reimbursement is made within three years after the date on which the Adviser incurred the expense.
[2] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[3] “Other Expenses” are estimated for the current fiscal year.
[4] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds, and are estimated for the current fiscal year.
[5] Brown Advisory LLC (the "Adviser") has contractually agreed to waive its fees and/or reimburse certain expenses (exclusive of any front-end or contingent deferred sales loads, taxes, interest, brokerage commissions, acquired fund fees and expenses, expenses incurred in connection with any merger or reorganization and extraordinary expenses) in order to limit the Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement for Institutional Shares, Investor Shares and Advisor Shares to 0.93%, 1.08% and 1.33%, respectively, of the Fund’s average daily net assets through October 31, 2022. The Fund may have Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement higher than these expense caps as a result of any acquired fund fees and expenses or other expenses that are excluded from the calculation. The contractual waivers and expense reimbursements may be changed or eliminated at any time by the Board of Trustees, on behalf of the Fund, upon 60 days written notice to the Adviser. The contractual waivers and expense reimbursements may not be terminated by the Adviser without the consent of the Board of Trustees. The Adviser may recoup any waived amount from the Fund pursuant to this agreement if such reimbursement does not cause the Fund to exceed existing expense limitations or the limitations in place at the time the reduction was originally made and the reimbursement is made within three years after the date on which the Adviser incurred the expense.
[6] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds, and are estimated for the current fiscal year. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[7] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[8] The Adviser has agreed to waive all or any portion of the advisory fee that would otherwise be paid by the Fund to Brown Advisory LLC in an amount equal to the separate advisory fee indirectly paid by the Fund to the Brown Advisory Mortgage Securities Fund. The contractual waiver may be changed or eliminated at any time by the Board of Trustees, on behalf of the Fund, upon 60 days written notice to the Adviser. The contractual waivers may not be terminated by the Adviser without the consent of the Board of Trustees.
[9] The Adviser has contractually agreed to waive its fees and/or reimburse certain expenses (exclusive of any front-end or contingent deferred sales loads, taxes, interest, brokerage commissions, acquired fund fees and expenses, expenses incurred in connection with any merger or reorganization and extraordinary expenses) in order to limit the Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement for Institutional Shares, Investor Shares and Advisor Shares to 0.48%, 0.53% and 0.78%, respectively, of the Fund’s average daily net assets through October 31, 2022. The Fund may have Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement higher than these expense caps as a result of any acquired fund fees and expenses or other expenses that are excluded from the calculation. The contractual waivers and expense reimbursements may be changed or eliminated at any time by the Board of Trustees, on behalf of the Fund, upon 60 days written notice to the Adviser. The contractual waivers and expense reimbursements may not be terminated by the Adviser without the consent of the Board of Trustees. The Adviser may recoup any waived amount from the Fund pursuant to this agreement if such reimbursement does not cause the Fund to exceed existing expense limitations or the limitations in place at the time the reduction was originally made and the reimbursement is made within three years after the date on which the Adviser incurred the expense.
[10] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[11] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[12] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[13] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.
[14] Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the “Financial Highlights” section of the Prospectus which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.