v3.26.3
Average Annual Total Returns
 12 Months Ended 15 Months Ended 34 Months Ended 46 Months Ended 51 Months Ended 60 Months Ended 73 Months Ended 95 Months Ended 101 Months Ended 120 Months Ended
Oct. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 1000® Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 1000® Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   17.37%   22.41%   12.36% 13.59%   14.33%   14.59%
Russell 1000® Growth Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 1000® Growth Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   18.70%         15.35%       18.14%
S&P 500® Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] S&P 500® Index    (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   17.88%         14.42%       14.82%
Russell 2000® Growth Index (reflects no deductions for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 2000® Growth Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   13.01%         3.18%       9.57%
Russell 2000 Value® Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 2000® Value Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   12.59%         8.88%       9.27%
Russell 2000 Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 2000® Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   12.81%       4.29%          
Russell 1000® Value Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Russell 1000® Value Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   15.91%   14.15%     11.33%   9.77%    
MSCI All Country World Index (ACWI)(reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] MSCI All Country World Index (ACWI) (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   22.34%         11.19%       11.72%
MSCI ACWI ex USA Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] MSCI ACWI ex USA Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   32.39%     9.91%            
Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index(reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   7.30%         (0.36%)     1.72% 2.01%
Bloomberg Intermediate US Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Bloomberg Intermediate U.S. Aggregate Bond Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   7.45%         0.68%       2.06%
Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Bloomberg Municipal Bond Index(reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   4.25%         0.80% 1.58%     2.34%
Bloomberg Municipal 1-15 Year Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Bloomberg Municipal 1-15 Year Index(reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   5.18%         1.16% 1.79%     2.27%
Bloomberg Mortgage Backed Securities Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Bloomberg Mortgage Backed Securities Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   8.58%         0.15%       1.59%
MSCI Europe Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] MSCI Europe Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   35.41%         10.30%       8.52%
MSCI Emerging Markets Index (reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index(reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   33.57%         4.20%       8.42%
TOPIX Net Total Return Index
(reflects no deduction for fees, expenses and taxes)                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] TOPIX Net Total Return Index (reflects no deduction for fees, expenses and taxes)                    
Average Annual Return, Percent   25.32% 15.84%                
Brown Advisory Growth Equity Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   1.66%         4.65%       11.98%
Brown Advisory Growth Equity Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   (9.73%)         (1.52%)       7.67%
Brown Advisory Growth Equity Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   8.83%         3.34%       9.40%
Brown Advisory Growth Equity Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   1.41%         4.38%       11.70%
Brown Advisory Growth Equity Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   1.82%         4.81%       12.14%
Brown Advisory Flexible Equity Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] – Return Before Taxes                    
Average Annual Return, Percent   9.75%         12.49%       14.38%
Brown Advisory Flexible Equity Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] – Return After Taxes on Distributions                    
Average Annual Return, Percent   8.30%         11.42%       13.50%
Brown Advisory Flexible Equity Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] – Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   6.79%         9.82%       11.92%
Brown Advisory Flexible Equity Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] – Return Before Taxes                    
Average Annual Return, Percent   9.46%         12.20%       14.09%
Brown Advisory Flexible Equity Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] – Return Before Taxes                    
Average Annual Return, Percent   9.90%         12.65%       14.55%
Brown Advisory Sustainable Growth Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   3.46%         9.13%       15.12%
Brown Advisory Sustainable Growth Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   (1.42%)         7.73%       14.19%
Brown Advisory Sustainable Growth Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   5.48%         7.20%       12.73%
Brown Advisory Sustainable Growth Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   3.20%         8.85%       14.83%
Brown Advisory Sustainable Growth Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   3.63%         9.29%       15.29%
Brown Advisory Small‑Cap Growth Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   2.38%         0.55%       8.27%
Brown Advisory Small‑Cap Growth Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   (1.61%)         (1.44%)       6.85%
Brown Advisory Small‑Cap Growth Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.27%         0.38%       6.60%
Brown Advisory Small‑Cap Growth Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   2.13%         0.31%       8.00%
Brown Advisory Small‑Cap Growth Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   2.54%         0.71%       8.44%
Brown Advisory Small‑Cap Fundamental Value Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.73%         10.42%       8.57%
Brown Advisory Small‑Cap Fundamental Value Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   2.77%         8.40%       6.99%
Brown Advisory Small‑Cap Fundamental Value Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   5.57%         8.13%       6.72%
Brown Advisory Small‑Cap Fundamental Value Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.45%         10.14%       8.29%
Brown Advisory Small‑Cap Fundamental Value Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.87%         10.59%       8.73%
Brown Advisory Sustainable Value Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   15.81%   15.93%              
Performance Inception Date Sep. 30, 2021                    
Brown Advisory Sustainable Small-Cap Core Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   9.45%       2.73%          
Performance Inception Date Sep. 30, 2021                    
Brown Advisory Sustainable Small-Cap Core Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   8.23%       2.40%          
Brown Advisory Sustainable Small-Cap Core Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   6.24%       2.06%          
Brown Advisory Sustainable Small-Cap Core Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   9.59%       2.90%          
Brown Advisory Sustainable Value Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   15.69%   15.72%              
Performance Inception Date Feb. 28, 2023                    
Brown Advisory Sustainable Value Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   15.12%   15.20%              
Brown Advisory Sustainable Value Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   9.66%   12.26%              
Brown Advisory Global Leaders Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   14.95%         9.13%       12.37%
Performance Inception Date Jul. 01, 2015                    
Brown Advisory Global Leaders Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   13.48%         8.72%       12.14%
Brown Advisory Global Leaders Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   9.88%         7.19%       10.35%
Brown Advisory Global Leaders Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   15.18%         9.30%       12.55%
Performance Inception Date Oct. 31, 2018                    
Brown Advisory Sustainable International Leaders Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   15.41%     5.71%            
Performance Inception Date Feb. 28, 2022                    
Brown Advisory Sustainable International Leaders Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   15.28%     5.54%            
Performance Inception Date Feb. 28, 2022                    
Brown Advisory Sustainable International Leaders Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   14.36%     5.31%            
Brown Advisory Sustainable International Leaders Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   9.77%     4.39%            
Brown Advisory Intermediate Income Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   7.03%         0.38%       1.90%
Brown Advisory Intermediate Income Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   5.38%         (0.75%)       0.87%
Brown Advisory Intermediate Income Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.13%         (0.19%)       1.01%
Brown Advisory Intermediate Income Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   6.72%         0.10%       1.62%
Brown Advisory Sustainable Bond Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   6.84%         (0.79%)     1.53%  
Performance Inception Date Aug. 07, 2017                    
Brown Advisory Sustainable Bond Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   4.95%         (2.12%)     0.20%  
Brown Advisory Sustainable Bond Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.02%         (1.14%)     0.64%  
Brown Advisory Sustainable Bond Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   6.89%         (0.74%)     1.58%  
Performance Inception Date Jul. 02, 2018                    
Brown Advisory Maryland Bond Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   4.72%         1.12%       1.97%
Brown Advisory Maryland Bond Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   4.70%         1.09%       1.94%
Brown Advisory Maryland Bond Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.26%         1.49%       2.11%
Brown Advisory Tax-Exempt Bond Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.48%         1.63%       2.66%
Performance Inception Date Jun. 29, 2012                    
Brown Advisory Tax-Exempt Bond Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   5.40%         1.53%       2.59%
Brown Advisory Tax-Exempt Bond Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.76%         1.93%       2.72%
Brown Advisory Tax-Exempt Bond Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.53%         1.70%       2.70%
Performance Inception Date Jul. 02, 2018                    
Brown Advisory Tax-Exempt Sustainable Bond Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   4.56%         0.98% 1.18%      
Performance Inception Date Dec. 02, 2019                    
Brown Advisory Tax-Exempt Sustainable Bond Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   4.42%         0.82% 1.04%      
Brown Advisory Tax-Exempt Sustainable Bond Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.04%         1.26% 1.37%      
Brown Advisory Mortgage Securities Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   7.98%         0.33%       1.81%
Brown Advisory Mortgage Securities Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   6.03%         (0.93%)       0.71%
Brown Advisory Mortgage Securities Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.69%         (0.30%)       0.90%
Brown Advisory Mortgage Securities Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   8.06%         0.36%       1.85%
Brown Advisory WMC Strategic European Equity Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Return Before Taxes                    
Average Annual Return, Percent   47.19%         14.46%       11.30%
Brown Advisory WMC Strategic European Equity Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions                    
Average Annual Return, Percent   44.53%         13.21%       10.14%
Brown Advisory WMC Strategic European Equity Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   29.56%         11.42%       9.08%
Brown Advisory - WMC Strategic European Equity Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Return Before Taxes                    
Average Annual Return, Percent   46.85%         14.17%       11.02%
Brown Advisory WMC Strategic European Equity Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] Return Before Taxes                    
Average Annual Return, Percent   47.43%         14.64%       11.47%
Brown Advisory Emerging Markets Select Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   30.82%         6.10%       7.45%
Brown Advisory Emerging Markets Select Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   30.44%         5.89%       7.32%
Brown Advisory Emerging Markets Select Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   18.71%         4.83%       6.19%
Brown Advisory Emerging Markets Select Fund Advisor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   30.48%         5.84%       7.18%
Brown Advisory Emerging Markets Select Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   30.96%         6.24%       7.62%
Brown Advisory Beutel Goodman Large-Cap Value Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.27%         9.07%   9.62%    
Performance Inception Date Feb. 13, 2018                    
Brown Advisory Beutel Goodman Large-Cap Value Fund Institutional Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   3.66%         7.51%   8.36%    
Brown Advisory Beutel Goodman Large-Cap Value Fund Institutional Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   4.15%         6.89%   7.51%    
Brown Advisory Beutel Goodman Large-Cap Value Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   5.19%         8.92%   9.46%    
Brown Advisory Beutel Goodman Large-Cap Value Fund Advisor Shares                      
Prospectus [Line Items]                      
Performance Inception Date Jun. 30, 2021                    
Brown Advisory WMC Japan Equity Fund Institutional Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   28.69% 15.63%                
Performance Inception Date Sep. 30, 2024                    
Brown Advisory WMC Japan Equity Fund Investor Shares                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return Before Taxes                    
Average Annual Return, Percent   28.42% 15.44%                
Performance Inception Date Sep. 30, 2024                    
Brown Advisory WMC Japan Equity Fund Investor Shares | After Taxes on Distributions                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions                    
Average Annual Return, Percent   26.83% 14.29%                
Brown Advisory WMC Japan Equity Fund Investor Shares | After Taxes on Distributions and Sales                      
Prospectus [Line Items]                      
Average Annual Return, Label [Optional Text] –Return After Taxes on Distributions and Sale of Fund Shares                    
Average Annual Return, Percent   17.18% 11.48%