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BBH International Equity Fund | BBH International Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading

BBH INTERNATIONAL EQUITY FUND SUMMARY

Investment Objective, Heading rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The investment objective of the BBH International Equity Fund (the “Fund”) is to provide investors with long-term maximization of total return, primarily through capital appreciation.

Expense, Heading rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

Expense, Narrative rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold the Fund's Class N and Class I shares.

Shareholder Fees, Caption rr_ShareholderFeesCaption

Shareholder Fees (Fees paid directly from your investment)

Operating Expenses, Caption rr_OperatingExpensesCaption

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Expenses Restated to Reflect Current rr_ExpensesRestatedToReflectCurrent

Other Expenses have been restated to reflect current fees.

Expense Example, Heading rr_ExpenseExampleHeading

EXAMPLE

Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund's Class N and Class I shares to the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund's Class N and Class I shares for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the operating expenses of the Fund's Class N and Class I shares remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover, Heading rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example above, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 18% of the average value of its portfolio.

Investment Strategy, Heading rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances at least 80% of the net assets of the Fund, plus any borrowings for investment purposes, are invested in equity securities of companies in the developed markets of the world, excluding the United States. Developed markets are those markets included in the Morgan Stanley Capital International — Europe, Australasia, and Far East Index (“MSCI-EAFE”) and Canada. The Fund will invest its assets in companies that are economically tied to at least twelve countries from different geographic regions throughout the world. The Fund may also from time to time invest up to 15% of its assets, at the time of purchase, in emerging markets of the world.

The Fund employs a “manager of managers” approach whereby portions of the Fund are allocated to different investment sub-advisers who employ investment styles broadly aligned with the investment adviser's principles of equity investing. The Fund currently uses one sub-adviser that employs a growth style and one that employs a value style. However, the investment adviser may also manage a portion the Fund's assets according to the Fund's principal investment strategies.

The Fund buys and sells securities denominated in currencies other than the U.S. dollar. Interest, dividends and sale proceeds on such securities are received in currencies other than the U.S. dollar. The Fund enters into foreign currency exchange transactions from time to time to convert to and from different foreign currencies and to convert foreign currencies to and from the U.S. dollar. The Fund may purchase currency forwards for the purpose of hedging the value of securities purchased or intended to be purchased.

Risk, Heading rr_RiskHeading

PRINCIPAL RISKS OF THE FUND

Risk, Narrative rr_RiskNarrativeTextBlock

The principal risks of investing in the Fund and the circumstances reasonably likely to adversely affect an investment are listed in alphabetical order and described below. The share price of the Fund changes daily, based on market conditions and other factors. A shareholder may lose money by investing in the Fund. There can be no assurance that the Fund will achieve its investment objective.

Capital Controls Risk:

Capital controls imposed by foreign governments in response to economic or political events may impact the ability of the Fund to buy, sell or otherwise transfer securities or currency, may adversely affect the trading market and price for shares of the Fund, and may cause the Fund to decline in value.

Currency Exchange Rate Risk:

Because the Fund invests in securities denominated in, or providing exposure to, non-U.S. currencies and the Fund's net asset value per share (“NAV”) is determined on the basis of U.S. dollars, the U.S. dollar value of your investment in the Fund may go down if the value of the local currency of the non-U.S. markets in which the Fund invests depreciates against the U.S. dollar. Currency exchange rates can be very volatile and can change quickly and unpredictably.

Emerging Markets Risk:

Emerging markets involve risks greater than those generally associated with investing in more developed foreign markets. These less developed markets can be subject to greater social, economic, regulatory and political uncertainties and can be extremely volatile.

Equity Securities Risk:

Equity securities risk is the risk that prices of equity securities rise and fall daily due to factors affecting individual companies, particular industries or the equity market as a whole.

Foreign Investment Risk:

Investing in securities of foreign-based companies involves risks not typically associated with investing in securities of companies organized and operated in the United States. These risks include adverse political, social and economic developments abroad, different kinds and levels of market and issuer regulations, and the different characteristics of overseas economies and markets. These factors can make foreign investments more volatile and potentially less liquid than U.S. investments.

Investment Risk:

Investors in the Fund could lose money, including the possible loss of the entire principal amount of an investment, over short or even long periods of time.

Management Risk:

The Fund is actively managed and its success depends upon the investment skills and analytical abilities of the sub-advisers to develop and effectively implement strategies that achieve the Fund's investment objective. Subjective decisions made by the sub-advisers may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

Market Risk:

The price of a security may fall due to changing economic, political, regulatory or market conditions, or due to a company's or issuer's individual situation.

Multi-Manager Risk:

The investment styles of the Fund's sub-advisers may not complement each other as expected by the investment adviser. The Fund's exposure to a particular stock, industry, country, geographic region or technique could be greater or smaller than if the Fund had a single investment adviser.

Non-Diversification Risk:

A non-diversified fund may be subject to greater risk than a diversified fund because changes in the financial condition of individual issuers, as well as political, regulatory or economic occurrences affecting such issuers may cause greater fluctuation in the value of a non-diversified fund's shares.

Shareholder Concentration Risk:

Asset allocation decisions, particularly large redemptions, made by an investment adviser whose discretionary clients make up a large percentage of the Fund's shareholders may adversely impact remaining Fund shareholders.

Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

Performance, Narrative rr_PerformanceNarrativeTextBlock

The Fund is a successor to a mutual fund of the same name, which was a series of BBH Fund, Inc. (the “Predecessor Fund”). Performance provided reflects the performance of the Predecessor Fund for periods prior to its reorganization into the Fund, as of the close of business on June 12, 2007. Prior to the reorganization, the Fund did not have any investment operations. Accordingly, the performance information provided in this Prospectus for the periods prior to that date is historical information of the Predecessor Fund, adjusted to reflect the Fund's anticipated expenses.

The following bar chart and table give an indication of the risks involved with an investment in the Fund. The bar chart shows changes in the performance of the Fund's Class N shares from year to year. The table shows how the average annual returns of the Fund's Class N and Class I shares for the periods indicated compared to a broad-based market index. One cannot invest directly in an index.

When you consider this information, please remember that the Fund's performance (before and after taxes) in past years is not necessarily an indication of how the Fund will perform in the future. Updated information on the Fund's performance can be obtained by visiting www.bbhfunds.com or can be obtained by phone at 1-800-575-1265.

Bar Chart, Heading rr_BarChartHeading

Total Return for Class N Shares (% Per Calendar Year)

Bar Chart, Closing rr_BarChartClosingTextBlock
Highest Performing Quarter:  19.44% in 2nd quarter of 2009 
Lowest Performing Quarter:  (18.80)% in 4th quarter of 2008 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel
Highest Performing Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel
Lowest Performing Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.80%)
Performance Table, Heading rr_PerformanceTableHeading

Average Annual Total Returns (Through December 31, 2015)

Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock

The Fund's performance figures assume that all distributions were reinvested in the Fund. 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 for Class I Shares will differ from those shown for Class N Shares. 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.

BBH International Equity Fund | BBH International Equity Fund | MSCI-EAFE Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes
(reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.81%)
5 Years rr_AverageAnnualReturnYear05 3.61%
10 Years rr_AverageAnnualReturnYear10 3.03%
BBH International Equity Fund | BBH International Equity Fund | Class N Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee on shares held less than 30 days after purchase (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee rr_ExchangeFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.07%
1 Year rr_ExpenseExampleYear01 $ 109
3 Years rr_ExpenseExampleYear03 340
5 Years rr_ExpenseExampleYear05 589
10 Years rr_ExpenseExampleYear10 $ 1,304
Annual Return 2006 rr_AnnualReturn2006 23.81%
Annual Return 2007 rr_AnnualReturn2007 10.14%
Annual Return 2008 rr_AnnualReturn2008 (37.06%)
Annual Return 2009 rr_AnnualReturn2009 29.68%
Annual Return 2010 rr_AnnualReturn2010 6.60%
Annual Return 2011 rr_AnnualReturn2011 (7.52%)
Annual Return 2012 rr_AnnualReturn2012 15.26%
Annual Return 2013 rr_AnnualReturn2013 17.00%
Annual Return 2014 rr_AnnualReturn2014 (3.30%)
Annual Return 2015 rr_AnnualReturn2015 (1.56%)
1 Year rr_AverageAnnualReturnYear01 (1.56%)
5 Years rr_AverageAnnualReturnYear05 3.49%
10 Years rr_AverageAnnualReturnYear10 3.49%
BBH International Equity Fund | BBH International Equity Fund | Class N Shares | Return After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.79%)
5 Years rr_AverageAnnualReturnYear05 3.25%
10 Years rr_AverageAnnualReturnYear10 3.00%
BBH International Equity Fund | BBH International Equity Fund | Class N Shares | Return After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.36%)
5 Years rr_AverageAnnualReturnYear05 2.95%
10 Years rr_AverageAnnualReturnYear10 2.89%
BBH International Equity Fund | BBH International Equity Fund | Class I Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee on shares held less than 30 days after purchase (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee rr_ExchangeFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.89%
1 Year rr_ExpenseExampleYear01 $ 91
3 Years rr_ExpenseExampleYear03 284
5 Years rr_ExpenseExampleYear05 493
10 Years rr_ExpenseExampleYear10 $ 1,096
1 Year rr_AverageAnnualReturnYear01 (1.33%)
5 Years rr_AverageAnnualReturnYear05 3.75%
10 Years rr_AverageAnnualReturnYear10 3.75%
[1] Other Expenses have been restated to reflect current fees.