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BBH U.S. GOVERNMENT MONEY MARKET FUND | BBH U.S. GOVERNMENT MONEY MARKET FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading

BBH U.S. GOVERNMENT MONEY MARKET FUND SUMMARY
Investment Objective, Heading rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The investment objective of the BBH U.S. Government Money Market Fund (formerly the BBH Money Market Fund) (the “Fund”) is to provide investors with as high a level of income as is consistent with the preservation of capital and the maintenance of liquidity.
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 Regular Shares and Institutional 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)
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 Regular Shares and Institutional Shares to the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund’s Regular Shares and Institutional 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 Regular Shares and Institutional Shares remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 99.5% of its total assets in cash and short-term U.S. Treasury securities and securities issued by U.S. government agencies or government-sponsored enterprises and repurchase agreements fully collateralized by such instruments. Additionally, under normal circumstances, at least 80% of the value of the Fund’s net assets will be invested in U.S. government securities and repurchase agreements fully collateralized by U.S. government securities. At the time of purchase, a portfolio investment must present minimal credit risk in accordance with procedures adopted by the Fund’s Board of Trustees (the “Board”) and pursuant to certain factors prescribed by Rule 2a-7 under the Investment Company Act of 1940, as amended (“1940 Act”). These investments may have fixed, floating or variable rates of interest. In pursuing its investment objective and implementing its investment strategies, the Fund will comply with Rule 2a-7 under the 1940 Act.

 

In selecting securities, the Fund’s investment adviser seeks to maximize current income within the limits of the Fund’s credit, maturity and diversification policies. Some of these policies may be stricter than required by applicable federal regulation. As a U.S. government money market fund, in order to preserve the value of investors’ capital, the Fund seeks to maintain a stable $1.00 net asset value (“NAV”) per share price.
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. There can be no assurance that the Fund will achieve its investment objective.

 

Credit Risk:

Credit risk refers to the likelihood that an issuer, guarantor, or counterparty to a debt obligation will default on interest or principal payments.

 

Interest Rate Risk:

This is the risk associated with the price fluctuation of a security in response to changes in interest rates and the possibility that the Fund’s yield may decline if interest rates decline.

 

Management Risk:

This is the risk that the securities selected by the investment adviser will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies.

 

Market Risk:

This is the risk that the prices of and the income generated by the Fund’s securities may decline due to changing economic, political or market conditions, or due to interest rate fluctuations.

 

Regulatory Risk:

The SEC and other regulators may adopt additional money market fund regulations in the future, which may impact the operation and performance of the Fund.

 

Repurchase Agreement Risk:

This is the risk that the other party to a repurchase agreement will default on its obligation under the agreement.

 

Shareholder Concentration Risk:

This is the risk that asset allocation decisions, particularly large redemptions, made by Brown Brothers Harriman & Co. (“BBH&Co.”), whose discretionary investment advisory clients make up a large percentage of the Fund’s shareholders, may adversely impact remaining Fund shareholders.

 

Stable NAV Risk:

This is the risk that the Fund will not be able to maintain a NAV per share of $1.00 at all times.

 

U.S. Government Agency Securities Risk:

Certain U.S. government agency securities are backed by the right of the issuer to borrow from the U.S. Treasury while others are supported only by the credit of the issuer or instrumentality. While the U.S. Government has historically provided financial support to U.S. government-sponsored agencies or instrumentalities during times of financial stress, such as the various actions taken to stabilize the Federal National Mortgage Association and Federal Home Loan Mortgage Corporation during the credit crisis of 2008, no assurance can be given that it will do so in the future. Such securities are neither issued nor guaranteed by the U.S. Treasury.

 

Variable and Floating Rate Instrument Risk:

The absence of an active market for these securities could make it difficult for the Fund to dispose of them if the issuer defaults.

 

You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit of BBH&Co. and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Additionally, BBH&Co. as the Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that BBH&Co. will provide financial support to the Fund at any time.
Risk, Lose Money rr_RiskLoseMoney

You could lose money by investing in the Fund.

Risk Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of BBH&Co. and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE
Performance, Narrative rr_PerformanceNarrativeTextBlock

The Fund is a successor to a mutual fund named the BBH Money Market Fund (the “Predecessor Fund”), which was a series of a Massachusetts business trust of the same name. The performance provided reflects the performance of the Predecessor Fund for periods prior to its reorganization into the Fund, at the close of business on June 12, 2007. Prior to the reorganization, the Fund achieved its investment objective by investing all of its assets in the BBH U.S. Money Market Portfolio. Accordingly, the performance and financial information provided in this Prospectus for the periods prior to June 13, 2007, is historical information of the Predecessor Fund.

 

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 Regular Shares from year to year. The table shows the average annual returns of the Fund’s Regular Shares and Institutional Shares for the periods indicated.

 

For current yield information, please call 1-800-575-1265 toll free, or contact your account representative. When you consider this information, please remember that the Fund’s performance in past years is not necessarily an indication of how the Fund will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table give an indication of the risks involved with an investment in the Fund.
Performance Availability Phone rr_PerformanceAvailabilityPhone

1-800-575-1265
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture

When you consider this information, please remember that the Fund’s performance in past years is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading

Total Return for Regular Shares (% Per Calendar Year)
Bar Chart Closing rr_BarChartClosingTextBlock
Highest Performing Quarter:   1.24% June 30, 2007  
Lowest Performing Quarter:   0.00% March 31, 2013  

 

As of September 30, 2016, the Fund’s Regular Shares and Institutional Shares had calendar year-to-date returns of 0.01% and 0.03%, respectively.
Year to Date Return, Label rr_YearToDateReturnLabel

As of September 30, 2016, the Fund’s Regular Shares and Institutional Shares had calendar year-to-date returns of 0.01% and 0.03%, respectively.
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2016
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel

Highest Performing Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2007
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.24%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel

Lowest Performing Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (Through December 31, 2015)
BBH U.S. GOVERNMENT MONEY MARKET FUND | BBH U.S. GOVERNMENT MONEY MARKET FUND | Regular Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFee none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.23%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.48%
1 Year rr_ExpenseExampleYear01 $ 49
3 Years rr_ExpenseExampleYear03 154
5 Years rr_ExpenseExampleYear05 269
10 Years rr_ExpenseExampleYear10 $ 604
Annual Return 2006 rr_AnnualReturn2006 4.61%
Annual Return 2007 rr_AnnualReturn2007 4.87%
Annual Return 2008 rr_AnnualReturn2008 2.24%
Annual Return 2009 rr_AnnualReturn2009 0.25%
Annual Return 2010 rr_AnnualReturn2010 0.01%
Annual Return 2011 rr_AnnualReturn2011 0.01%
Annual Return 2012 rr_AnnualReturn2012 0.01%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 0.01%
Annual Return 2015 rr_AnnualReturn2015 0.01%
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years/ Since Inception rr_AverageAnnualReturnYear10 1.19%
BBH U.S. GOVERNMENT MONEY MARKET FUND | BBH U.S. GOVERNMENT MONEY MARKET FUND | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFee none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.23%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.25%
1 Year rr_ExpenseExampleYear01 $ 26
3 Years rr_ExpenseExampleYear03 81
5 Years rr_ExpenseExampleYear05 141
10 Years rr_ExpenseExampleYear10 $ 318
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years/ Since Inception rr_AverageAnnualReturnYear10 0.87%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 26, 2007