Performance Management |
Oct. 31, 2026 |
|---|---|
| Brown Advisory Growth Equity Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary broad-based market index. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 1000® Growth Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 1000® Growth Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Growth Equity Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 13.00%. 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 -19.73% (for the quarter ended June 30, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 13.00% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 26.56% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (19.73%) |
| Lowest Quarterly Return, Date | Jun. 30, 2022 |
| Performance Table Heading | Brown Advisory Growth Equity Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/growth-equity-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Flexible Equity Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary 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/flexible-equity-fund or by calling 800‑540‑6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory Flexible Equity Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 8.15%. 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 [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 8.15% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 23.97% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (21.28%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory Flexible Equity Fund Average Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/flexible-equity-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Sustainable Growth Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 1000® Growth Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 1000® Growth Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Sustainable Growth Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 10.26%. 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 -18.85% (for the quarter ended June 30, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 10.26% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 28.71% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (18.85%) |
| Lowest Quarterly Return, Date | Jun. 30, 2022 |
| Performance Table Heading | Brown Advisory Sustainable Growth Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. 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 are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/sustainable-growth-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Small-Cap Growth Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 2000® Growth Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 2000® Growth Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Small-Cap Growth Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 12.22%. 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 [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 12.22% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 30.56% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (23.30%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory Small-Cap Growth Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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. |
| Performance Table Not Relevant to Tax Deferred | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/small-cap-growth-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Small‑Cap Fundamental Value Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 2000® Value Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 2000® Value Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Small-Cap Fundamental Value Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 12.82%. 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 [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 12.82% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 20.73% |
| Highest Quarterly Return, Date | Dec. 31, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (36.84%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory Small-Cap Fundamental Value Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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. |
| Performance Table Not Relevant to Tax Deferred | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/small-cap-fundamental-value-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Sustainable Small-Cap Core Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following performance information provides some indication of the risks of investing in the Fund. The chart shows the 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 the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 2000® Index is also included for comparison. 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-small-cap-core-fund or by calling 800-540-6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 2000® Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Sustainable Small-Cap Core Fund– Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 8.90%. During the period shown in the chart, the highest quarterly return was 13.91% (for the quarter ended December 31, 2023) and the lowest quarterly return was -15.96% (for the quarter ended June 30, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date |
| Bar Chart, Year to Date Return | 8.90% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 13.91% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (15.96%) |
| Lowest Quarterly Return, Date | Jun. 30, 2022 |
| Performance Table Heading | Brown Advisory Sustainable Small-Cap Core FundAverage Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/sustainable-small-cap-core-fund |
| Performance Availability Phone [Text] | 800-540-6807 |
| Brown Advisory Sustainable Value Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows the Fund’s performance of Investor Shares from year-to-year. The table shows how the average annual returns of Investor Shares for the 1 year and since inception periods compare to the Fund's primary broad-based market index. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 1000® Value Index is also included for comparison. 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-value-fund or by calling 800-540-6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 1000® Value Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Sustainable Value Fund– Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 7.78%. During the period shown in the chart, the highest quarterly return was 12.66% (for the quarter ended March 31, 2024) and the lowest quarterly return was -1.93% (for the quarter ended December 31, 2024).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 7.78% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 12.66% |
| Highest Quarterly Return, Date | Mar. 31, 2024 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (1.93%) |
| Lowest Quarterly Return, Date | Dec. 31, 2024 |
| Performance Table Heading | Brown Advisory Sustainable Value FundAverage Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/sustainable-value-fund |
| Performance Availability Phone [Text] | 800-540-6807 |
| Brown Advisory Global Leaders Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory Global Leaders Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -2.68%. 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 [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (2.68%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 18.98% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (18.78%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory Global Leaders Fund Average Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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 Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | NOTE: The Global Leaders Fund offers two classes of shares. Investor Shares commenced operations 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/global-leaders-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Sustainable International Leaders Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows 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 the Fund's primary 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-international-leaders-fund or by calling 800-540-6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory Sustainable International Leaders Fund– Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -3.77%. During the period shown in the chart, the highest quarterly return was 12.17% (for the quarter ended December 31, 2023) and the lowest quarterly return was -10.87% (for the quarter ended September 30, 2023).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (3.77%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 12.17% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (10.87%) |
| Lowest Quarterly Return, Date | Sep. 30, 2023 |
| Performance Table Heading | Brown Advisory Sustainable International Leaders FundAverage Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/sustainable-international-leaders-fund |
| Performance Availability Phone [Text] | 800-540-6807 |
| Brown Advisory Intermediate Income Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Bloomberg U.S. Aggregate Bond Index as the Fund’s primary benchmark. The Bloomberg Intermediate U.S. Aggregate Bond Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Bloomberg Intermediate U.S. Aggregate Bond Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Intermediate Income Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -2.34%. 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 -4.22% (for the quarter ended March 31, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (2.34%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 5.61% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (4.22%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |
| Performance Table Heading | Brown Advisory Intermediate Income Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Bloomberg U.S. Aggregate Bond Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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 will vary. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/intermediate-income-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Sustainable Bond Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory Sustainable Bond Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -3.16%. 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 -5.14% (for the quarter ended March 31, 2022)
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (3.16%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 6.54% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (5.14%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |
| Performance Table Heading | Brown Advisory Sustainable Bond Fund Average Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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] | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. 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 Institutional Shares will vary.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/sustainable-bond-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Maryland Bond Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 the Fund's primary broad-based market index and secondary indices provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. The Bloomberg Municipal 1-15 Year Index is included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The table shows how the average annual returns of Investor Shares for 1 year, 5 year, and 10 year periods compare to the Fund's primary broad-based market index and secondary indices provided to offer additional market perspective. |
| Bar Chart [Heading] | Brown Advisory Maryland Bond Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -3.15%. During the periods shown in the chart, the highest quarterly return was 6.13% (for the quarter ended December 31, 2023) and the lowest quarterly return was -5.51% (for the quarter ended March 31, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (3.15%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 6.13% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (5.51%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |
| Performance Table Heading | Brown Advisory Maryland Bond Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/maryland-bond-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Tax-Exempt Bond Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. The Bloomberg Municipal 1-15 Year Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Bloomberg Municipal 1-15 Year Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Tax-Exempt Bond Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -2.76%. During the period shown in the chart, the highest quarterly return was 5.98% (for the quarter ended December 31, 2023) and the lowest quarterly return was -6.27% (for the quarter ended March 31, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (2.76%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 5.98% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (6.27%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |
| Performance Table Heading | Brown Advisory Tax-Exempt Bond Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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] | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. 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 Institutional Shares will vary.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/tax-exempt-bond-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Tax-Exempt Sustainable Bond Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 for the 1 year, 5 year, and since inception periods compare to the Fund's primary broad-based market index and secondary indices provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. The Bloomberg Municipal 1-15 Year Index is also included for comparison. 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-sustainable-bond-fund or by calling 800‑540‑6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Bloomberg Municipal 1-15 Year Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Tax-Exempt Sustainable Bond Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -2.90%. During the period shown in the chart, the highest quarterly return was 5.79% (for the quarter ended December 31, 2023) and the lowest quarterly return was -6.42% (for the quarter ended March 31, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (2.90%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 5.79% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (6.42%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |
| Performance Table Heading | Brown Advisory Tax-Exempt Sustainable Bond Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Bloomberg Municipal Bond Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/tax-exempt-sustainable-bond-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Mortgage Securities Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Bloomberg U.S. Aggregate Bond Index as the Fund’s primary benchmark. The Bloomberg Mortgage Backed Securities Index is also included for comparison. 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Bloomberg Mortgage Backed Securities Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory Mortgage Securities Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -3.50%. During the period shown in the chart, the highest quarterly return was 6.62% (for the quarter ended December 31, 2023) and the lowest quarterly return was -4.91% (for the quarter ended September 30, 2022).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (3.50%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 6.62% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (4.91%) |
| Lowest Quarterly Return, Date | Sep. 30, 2022 |
| Performance Table Heading | Brown Advisory Mortgage Securities Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Bloomberg U.S. Aggregate Bond Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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 One Class of after Tax Shown [Text] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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 Institutional Shares will vary. |
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/mortgage-securities-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory WMC Strategic European Equity Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory – WMC Strategic European Equity Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was -0.17%. During the period shown in the chart, the highest quarterly return was 21.67% (for the quarter ended December 31, 2022) and the lowest quarterly return was -22.13% (for the quarter ended March 31, 2020).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | (0.17%) |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 21.67% |
| Highest Quarterly Return, Date | Dec. 31, 2022 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (22.13%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory – WMC Strategic European Equity Fund Average Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/wmc-strategic-european-equity-fund |
| Performance Availability Phone [Text] | 800-540-6807 |
| Brown Advisory Emerging Markets Select Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 10 year periods compare to the Fund's primary 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) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory Emerging Markets Select Fund – Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 16.77%. 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 [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 16.77% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 21.39% |
| Highest Quarterly Return, Date | Dec. 31, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (24.85%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory Emerging Markets Select Fund Average Annual Total Returns |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Advisor Shares and Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/emerging-markets-select-fund |
| Performance Availability Phone [Text] | 800‑540‑6807 |
| Brown Advisory Beutel Goodman Large-Cap Value Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | 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 Institutional Shares from year-to-year. The table shows how the average annual returns of Institutional Shares and Investor Shares for the 1 year, 5 year, and since inception periods compare to the Fund's primary broad-based market index and a secondary index provided to offer additional market perspective. In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. The Russell 1000® Value Index is also included for comparison. 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 call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The Russell 1000® Value Index is also included for comparison. |
| Bar Chart [Heading] | Brown Advisory - Beutel Goodman Large-Cap Value Fund – Institutional Shares Annual Total Return |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 10.82%. During the period shown in the chart, the highest quarterly return was 16.91% (for the quarter ended December 31, 2022) and the lowest quarterly return was -20.42% (for the quarter ended March 31, 2020).
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 10.82% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 16.91% |
| Highest Quarterly Return, Date | Dec. 31, 2022 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | (20.42%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |
| Performance Table Heading | Brown Advisory - Beutel Goodman Large-Cap Value Fund Average Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the Russell 1000® Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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 | 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] | Performance shown prior to inception of the Investor Shares is based on the performance of Institutional Shares, adjusted for the higher expenses applicable to Investor Shares. |
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown for Institutional Shares only. After-tax returns for Investor Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | NOTE: The Fund offers two classes of shares. Institutional Shares commenced operations on February 13, 2018, and Investor Shares commenced operations on June 30, 2021. Performance shown prior to inception of the Investor Shares is based on the performance of Institutional Shares, adjusted for the higher expenses applicable to Investor 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 Institutional Shares only. After-tax returns for Investor Shares will vary.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/beutel-goodman-large-cap-value-fund |
| Performance Availability Phone [Text] | 800-540-6807 |
| Brown Advisory WMC Japan Equity Fund | |
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following performance information provides some indication of the risks of investing in the Fund. The bar chart shows the Fund’s performance of Investor Shares for one 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 the Fund's primary broad-based market index. In accordance with regulatory requirements, the Fund has selected the TOPIX Net Total Return Index as the Fund’s primary benchmark. 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-japan-equity-fund or by calling 800-540-6807 (toll free) or call 414-203-9064.
|
| Performance Past Does Not Indicate Future [Text] | Performance information represents only past performance, before and after taxes, and does not necessarily indicate future results. |
| Performance Information Illustrates Variability of Returns [Text] | The following performance information provides some indication of the risks of investing in the Fund. |
| Bar Chart [Heading] | Brown Advisory - WMC Japan Equity Fund– Investor Shares Annual Total Returns |
| Bar Chart Closing [Text Block] | The Fund’s calendar year-to-date total return as of September 30, 2026 was 23.94%. During the period shown in the chart, the highest quarterly return was 10.68% (for the quarter ended June 30, 2025) and the lowest quarterly return was 3.00% (for the quarter ended December 31, 2025.
|
| Year to Date Return, Label [Optional Text] | year-to-date total return |
| Bar Chart, Year to Date Return | 23.94% |
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 10.68% |
| Highest Quarterly Return, Date | Jun. 30, 2025 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | 3.00% |
| Lowest Quarterly Return, Date | Dec. 31, 2025 |
| Performance Table Heading | Brown Advisory - WMC Japan Equity FundAverage Annual Total Returns |
| Performance Table Market Index Changed | In accordance with regulatory requirements, the Fund has selected the TOPIX Net Total Return Index as the Fund’s primary benchmark. |
| Performance Table Uses Highest Federal Rate | 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 | 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] | After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses and taxes) |
| Performance Table Closing [Text Block] | 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.
|
| Performance Availability Website Address [Text] | www.brownadvisory.com/mf/wmc-japan-equity-fund |
| Performance Availability Phone [Text] | 414-203-9064 |