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Label Element Value
Trillium ESG Global Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Trillium ESG Global Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Trillium ESG Global Equity Fund (the “Global Equity Fund” or “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Global Equity Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and expenses below. Institutional Shares may also be available on certain brokerage platforms. An investor transacting in Institutional Shares through a broker acting as an agent for the investor may be required to pay a commission and/or other forms of compensation to the broker.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Global Equity 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 portfolio operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s turnover rate was 10% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the costs of investing in the Global Equity Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem (sell) 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 Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Global Equity Fund invests primarily in common stocks of companies that Trillium Asset Management, LLC (the “Adviser”) believes are leaders in managing Environmental, Social, and
Governance (“ESG”) risks and opportunities, have above average growth potential, and are reasonably valued. Under normal market conditions, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested in equity securities that meet the Adviser’s ESG criteria, although the Adviser intends to normally be fully invested in such securities.

When selecting securities for the Fund, the Adviser conducts detailed financial analysis that includes a review of ESG issues and how they may impact a stock’s valuation or performance and selects securities that meet the Adviser’s financial and ESG criteria. ESG factors can reflect a variety of key sustainability issues that can influence company risks and opportunities and span a range of metrics including climate change policies, supply chain and human rights policies. Companies that meet the Adviser’s ESG criteria typically have transparent sustainability data and policy reporting. ESG criteria may be somewhat different industry by industry. For example, factory-level environmental assessments are relevant to the Industrial Sector while not applicable to the Financial Services sector. In its selection process, of the three ESG components, the Adviser emphasizes “Environmental” factors, such as ecological limits, environmental stewardship and environmental strategies for the Fund, more than Social and Governance factors. The Adviser utilizes information obtained from multiple third-party providers for both financial and ESG data, in addition to internally generated analysis, throughout its proprietary investment process. Third-party information providers currently include Bloomberg L.P., MSCI Inc., FactSet Research Systems Inc., and Institutional Shareholder Services, Inc.

The Fund invests globally and has exposure to both emerging (including frontier market countries) and developed markets. The Fund may invest in companies of any size, and seeks diversification by country and economic sector. The Fund invests primarily in common stocks or American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”).

The Global Equity Fund generally will invest approximately 50%, and at least 40%, of its net assets in foreign companies. Foreign companies are those that either maintain their principal place of business outside of the United States, have their securities principally traded on non-U.S. exchanges or were formed under the laws of non-U.S. countries. Foreign companies may include companies doing business in the United States but meet the general criteria of a foreign company described above. The Fund generally will invest in approximately 15 to 20, and in at least three, different countries outside of the United States.

The Global Equity Fund’s foreign holdings may include companies domiciled in emerging markets (including frontier market countries) as well as companies domiciled in developed markets. There is no limit to the percent of the Fund’s foreign holdings that may be invested in either emerging (including frontier market countries) or developed markets and therefore the Fund may be invested entirely in companies from emerging markets. The Adviser utilizes information obtained from multiple third party economic and financial information providers in its process to categorize emerging markets countries. Emerging markets are markets of countries in the initial stages of industrialization and generally have low per capita income. Certain emerging markets are sometimes referred to as “frontier markets.” Frontier markets are the least advanced capital markets in the developing world. Frontier markets are countries with investable stock markets that are less established than those in the emerging markets.

The Adviser believes that the best long-term investments are found in companies with above-average financial characteristics and growth potential that also excel at managing environmental risks and opportunities, societal impact, and corporate governance impact. The Adviser believes that a company’s understanding of environmental, social and governance principles demonstrates the qualities of innovation and leadership that create a distinct competitive advantage and build long-term value.
Therefore, the Adviser conducts fundamental research to find companies with attractive environmental, societal, and financial attributes. In conducting fundamental research, the Adviser combines traditional investment information with proprietary environmental, social, and governance analysis. The Adviser believes that this creates a complete picture of how each company behaves commercially and how it deals with existing and emerging environmental risks and opportunities. The Adviser considers a company’s position on various factors such as ecological limits, environmental stewardship, environmental strategies, stance on human rights and equality, societal impact as well as its corporate governance practices.

The Adviser believes that finding companies that meet its financial and environmental standards is an important part of the process, but that it is also critical to make investments at reasonable valuations.

The Adviser may sell stocks for several reasons, including when the stock no longer meets its ESG criteria or when the security declines in value or is overvalued and no longer reflects the investment thesis defined by the Adviser.
Additionally, the Global Equity Fund may participate in securities lending arrangements of up to 33 1/3% of the securities in its portfolio to brokers, dealers and financial institutions (but not individuals) in order to increase the return on its portfolio.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is a risk that you could lose all or a portion of your investment in the Global Equity Fund. The following risks are considered principal to the Global Equity Fund and could affect the value of your investment in the Fund:

•Sustainability (ESG) Policy Risk: The Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy. The application of the Adviser’s social, environmental and governance standards may affect the Fund’s exposure to certain issuers, industries, sectors, and factors that may impact the relative financial performance of the Fund — positively or negatively — depending on whether such investments are in or out of favor.

•Equity Risk: Equity securities are susceptible to general stock market fluctuations which may result in volatile increases and decreases in value. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

•Foreign Securities and Emerging Markets Risk: Foreign securities involve increased risks due to political, social and economic developments abroad, as well as due to differences between United States and foreign regulatory practices. Because securities of foreign issuers generally will not be registered with the Securities and Exchange Commission (“SEC”), and such issuers will generally not be subject to the SEC’s reporting requirements, there is likely to be less publicly available information concerning certain of the foreign issuers of securities held by the Fund than is available concerning U.S. companies. Additionally, with respect to some foreign countries there may be the possibility of expropriation or confiscatory taxation. Securities that are denominated in foreign currencies are subject to the further risk that the value of the foreign currency will fall in relation to the U.S. dollar and/or will be affected by volatile currency markets or actions of U.S. and foreign governments or central banks. Currency exchange rates may fluctuate significantly over short periods of time. To the extent the Fund invests in issuers located in emerging countries, these risks may be more pronounced. Certain emerging markets are sometimes referred to as “frontier markets.” Frontier
markets, the least advanced capital markets in the developing world, are among the riskiest markets in the world in which to invest. Frontier markets have the fewest number of investors and investment holdings and may not even have stock markets on which to trade. Investments in this sector are typically illiquid, nontransparent and subject to very low regulation levels as well as high transaction fees, and may also have substantial political and currency risk.

The remaining principal risks are presented in alphabetical order. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.

•Large Companies Risk: Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. In addition, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

•Management Risk: The Adviser may fail to implement the Global Equity Fund’s investment strategies and meet its investment objective. There is no guarantee that the Adviser’s judgments about the attractiveness, value and potential appreciation of particular investments in which the Fund invests will be correct or produce the desired results.

•Market and Regulatory Risk: Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Such adverse effect on performance could include a decline in the value and liquidity of securities held by the Fund, unusually high and unanticipated levels of redemptions, an increase in portfolio turnover, a decrease in NAV, and an increase in Fund expenses. In addition, because of interdependencies between markets, events in one market may adversely impact markets or issuers in which the Fund invests in unforeseen ways. Traditionally, liquid investments may experience periods of diminished liquidity. During a general downturn in the financial markets, multiple asset classes may decline in value and the Fund may lose value, regardless of the individual results of the securities and other instruments in which the Fund invests. It is impossible to predict whether or for how long such market events will continue, particularly if they are unprecedented, unforeseen or widespread events or conditions. Therefore, it is important to understand that the value of your investment may fall, sometimes sharply and for extended periods, and you could lose money.

•Securities Lending Risk: Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, the Fund may lose money and there may be a delay in recovering the loaned securities. The Fund could also lose money if it does not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral.
•Small and Mid-Sized Company Risk: Investments in small to mid-sized companies may be speculative and volatile and involve greater risks than are customarily associated with larger companies. Small to mid-sized companies may be subject to greater market risk and have less trading liquidity than larger companies. They may also have limited product lines, markets, or financial resources. For these reasons, investors should expect the Fund to be more volatile than a fund that invests exclusively in large-capitalization companies.
Risk Lose Money [Text] rr_RiskLoseMoney There is a risk that you could lose all or a portion of your investment in the Global Equity Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the Global Equity Fund. The bar chart below illustrates how the Fund’s Retail Class shares total returns have varied from year to year. The table below illustrates how the Fund’s average annual total returns for 1, 5, and 10-year periods compare with that of a broad-based securities index. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.trilliummutualfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Global Equity Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.trilliummutualfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return as of December 31, * Retail Class
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock The Global Equity Fund’s year-to-date return as of September 30, 2021 was 13.53%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the period shown in the bar chart, the Global Equity Fund’s Retail Class shares’ highest quarterly return was 18.50% for the quarter ended June 30, 2020, and the lowest quarterly return was -18.76% for the quarter ended March 31, 2020.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.76%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of December 31, 2020
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees or expenses)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). Such taxes are eligible for pass through of foreign tax credits. Shareholders can use the foreign tax credits to reduce their tax liability. With a reduced tax liability, the shareholders are then able to reinvest more of the dividends allowing for a higher return.
Trillium ESG Global Equity Fund | MSCI All Cap World Index (Net Total Return) (reflects no deduction for fees or expenses)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI All Cap World Index (Net Total Return) (reflects no deduction for fees or expenses)
1 Year rr_AverageAnnualReturnYear01 16.25%
5 Years rr_AverageAnnualReturnYear05 12.26%
10 Years rr_AverageAnnualReturnYear10 9.13%
Trillium ESG Global Equity Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PORIX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.91%
5 Years rr_AverageAnnualReturnYear05 14.78%
10 Years rr_AverageAnnualReturnYear10 10.25%
Trillium ESG Global Equity Fund | Retail Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PORTX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.23%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 713
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,568
Annual Return 2011 rr_AnnualReturn2011 (8.04%) [1]
Annual Return 2012 rr_AnnualReturn2012 15.17% [1]
Annual Return 2013 rr_AnnualReturn2013 22.16% [1]
Annual Return 2014 rr_AnnualReturn2014 (0.46%) [1]
Annual Return 2015 rr_AnnualReturn2015 1.91% [1]
Annual Return 2016 rr_AnnualReturn2016 3.72% [1]
Annual Return 2017 rr_AnnualReturn2017 27.86% [1]
Annual Return 2018 rr_AnnualReturn2018 (7.17%) [1]
Annual Return 2019 rr_AnnualReturn2019 28.20% [1]
Annual Return 2020 rr_AnnualReturn2020 24.57% [1]
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.57%
5 Years rr_AverageAnnualReturnYear05 14.48%
10 Years rr_AverageAnnualReturnYear10 9.94%
Trillium ESG Global Equity Fund | Retail Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 24.02%
5 Years rr_AverageAnnualReturnYear05 13.74%
10 Years rr_AverageAnnualReturnYear10 9.19%
Trillium ESG Global Equity Fund | Retail Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 14.92%
5 Years rr_AverageAnnualReturnYear05 11.53%
10 Years rr_AverageAnnualReturnYear10 8.04%
Trillium ESG Small/Mid Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Trillium ESG Small/Mid Cap Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Trillium ESG Small/Mid Cap Fund (the “SMID Fund” or “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the SMID Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and expenses below. Institutional Shares may also be available on certain brokerage platforms. An investor transacting in Institutional Shares through a broker acting as an agent for the investor may be required to pay a commission and/or other forms of compensation to the broker.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination October 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The SMID 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 above example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s turnover rate was 20% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the SMID Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual Expense Cap for the first year only).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the SMID Fund seeks to achieve its objective by investing at least 80% of its net assets (plus borrowings for investment purposes) in equity securities of small and mid-sized companies that meet the Adviser’s Environmental, Social, and Governance (“ESG”) criteria. The Adviser defines small- and mid-cap companies as those whose market capitalization, at the time of purchase, are consistent with the market capitalizations of companies in the S&P 1000® Index. As of September 30, 2021, the market capitalization range of companies in the S&P 1000® Index was $124.5 million to $16.5 billion. The Adviser seeks stocks with high quality characteristics and strong ESG profiles. Trillium defines high-quality characteristics to include:

•Financial Statement Integrity
•Conservative Debt Management
•Positive and Growing Cash Flow from Operations
•Sector-leading policies and performance related to key ESG Issues

When selecting securities for the Fund, the Adviser conducts detailed financial analysis that includes a review of ESG issues and how they may impact stock valuation or performance. ESG criteria reflect a variety of key sustainability issues that can influence company risks and opportunities and span a range of metrics including board diversity, climate change policies, and supply chain and human rights policies. Companies that meet our ESG criteria or sustainability requirements typically have transparent sustainability data and policy reporting. ESG criteria may be somewhat different industry by industry. For example, assessment of chemical inputs used in the production of consumer products could be considered relevant environmental criteria for analysis of the Consumer Staples sector, while the same consideration is not applicable when analyzing environmental standards within the Financials Sector. The Adviser utilizes information obtained from multiple third-party providers for both financial and ESG data, in addition to internally generated analysis, throughout its proprietary investment process. Third-party information providers currently include Bloomberg L.P., MSCI Inc., FactSet Research Systems Inc., and Institutional Shareholder Services, Inc.

Additionally, the Fund may invest up to 20% of its total assets in the securities of foreign issuers, including indirectly through American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”). The Fund’s foreign holdings may include companies domiciled in frontier or emerging markets as well as companies domiciled in developed markets. The Adviser utilizes information obtained from multiple third party economic and financial information providers in its process to categorize emerging markets countries. Emerging markets are markets of countries in the initial stages of industrialization and generally have low per capita income. Certain emerging markets are sometimes referred to as “frontier markets.” Frontier markets are the least advanced capital markets in the developing world. Frontier markets are countries with investable stock markets that are less established than those in the emerging markets.
The Adviser may sell stocks for several reasons, including when the stock no longer meets its ESG criteria or when the security declines in value or is overvalued and no longer reflects the investment thesis defined by the Adviser or if the security rises well beyond the capitalization range of the product.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is the risk that you could lose all or a portion of your investment in the SMID Fund. The following risks are considered principal to the SMID Fund and could affect the value of your investment in the Fund:

•Sustainability (ESG) Policy Risk: The Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy. The application of the Adviser’s social, environmental and governance standards may affect the Fund’s exposure to certain issuers, industries, sectors, and factors that may impact the relative financial performance of the Fund — positively or negatively — depending on whether such investments are in or out of favor.
•Equity Risk: Equity securities are susceptible to general stock market fluctuations which may result in volatile increases and decreases in value. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

•Small and Mid-Sized Company Risk: Investments in small to mid-sized companies may be speculative and volatile and involve greater risks than are customarily associated with larger companies. Small to mid-sized companies may be subject to greater market risk and have less trading liquidity than larger companies. They may also have limited product lines, markets, or financial resources. For these reasons, investors should expect the Fund to be more volatile than a fund that invests exclusively in large-capitalization companies.

The remaining principal risks are presented in alphabetical order. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears.

•Foreign Securities and Emerging Markets Risk: Foreign securities involve increased risks due to political, social and economic developments abroad, as well as due to differences between United States and foreign regulatory practices. Because securities of foreign issuers generally will not be registered with the Securities and Exchange Commission (“SEC”), and such issuers will generally not be subject to the SEC’s reporting requirements, there is likely to be less publicly available information concerning certain of the foreign issuers of securities held by the Fund than is available concerning U.S. companies. Additionally, with respect to some foreign countries there may be the possibility of expropriation or confiscatory taxation. Securities that are denominated in foreign currencies are subject to the further risk that the value of the foreign currency will fall in relation to the U.S. dollar and/or will be affected by volatile currency markets or actions of U.S. and foreign governments or central banks. Currency exchange rates may fluctuate significantly over short periods of time. To the extent the Fund invests in issuers located in emerging countries, these risks may be more pronounced. Certain emerging markets are sometimes referred to as “frontier markets.” Frontier markets, the least advanced capital markets in the developing world, are among the riskiest markets in the world in which to invest. Frontier markets have the fewest number of investors and investment holdings and may not even have stock markets on which to trade. Investments in this sector are typically illiquid, nontransparent and subject to very low regulation levels as well as high transaction fees, and may also have substantial political and currency risk.

•Management Risk: Trillium may fail to implement the Fund’s investment strategies or meet its investment objective. There is no guarantee that the Adviser’s judgments about the attractiveness, value and potential appreciation of particular investments in which the Fund invests will be correct or produce the desired results.

•Market and Regulatory Risk: Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Such adverse effect on performance could include a decline in the value and liquidity of securities held by the Fund, unusually high and unanticipated levels of redemptions, an increase in portfolio turnover, a decrease in NAV, and an increase in Fund expenses. In addition, because of interdependencies between markets, events in one market may adversely impact markets or issuers in which the Fund invests in unforeseen ways. Traditionally, liquid investments may experience periods of diminished liquidity. During a general downturn in the financial markets, multiple asset classes may decline in value and the Fund may lose value, regardless of the individual results of the securities and other instruments in which the Fund invests. It is impossible to predict whether or for how long such market events will continue, particularly if they are unprecedented, unforeseen or widespread events or conditions. Therefore, it is important to understand that the value of your investment may fall, sometimes sharply and for extended periods, and you could lose money.
Risk Lose Money [Text] rr_RiskLoseMoney There is the risk that you could lose all or a portion of your investment in the SMID Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the SMID Fund. The bar chart below illustrates how the Fund’s Institutional Class shares total returns have varied from year to year. The table below illustrates how the Fund’s Institutional Class shares average annual total returns for the 1-year, 5-year and since inception periods compare with that of a broad-based securities index. The Fund’s Institutional Class shares past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.trilliummutualfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the SMID Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.trilliummutualfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s Institutional Class shares past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return as of December 31, * Institutional Class
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock The SMID Fund’s year-to-date return as of September 30, 2021 was 14.88%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the period shown in the bar chart, the SMID Fund’s Institutional Class shares’ highest quarterly return was 24.47% for the quarter ended December 31, 2020, and the lowest quarterly return was -28.79% for the quarter ended March 31, 2020.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 14.88%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.47%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.79%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of December 31, 2020
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees or expenses)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Return After Taxes on Distributions” may be higher than the “Return Before Taxes” figures because the Fund receives dividends on securities that are net of foreign taxes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). The “Return After Taxes on Distributions” may be higher than the “Return Before Taxes” figures because the Fund receives dividends on securities that are net of foreign taxes. Such taxes are eligible for pass through of foreign tax credits. Shareholders can use the foreign tax credits to reduce their tax liability. With a reduced tax liability, the shareholders are then able to reinvest more of the dividends allowing for a higher return.
Trillium ESG Small/Mid Cap Fund | S&P 1000® Index (reflects no deduction for fees or expenses)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 1000® Index (reflects no deduction for fees or expenses)
1 Year rr_AverageAnnualReturnYear01 12.98%
5 Years rr_AverageAnnualReturnYear05 12.37%
Since Inception rr_AverageAnnualReturnSinceInception 11.45%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2015
Trillium ESG Small/Mid Cap Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TSMDX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.77%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.79%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 480
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 885
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,019
Annual Return 2016 rr_AnnualReturn2016 14.48% [3]
Annual Return 2017 rr_AnnualReturn2017 18.97% [3]
Annual Return 2018 rr_AnnualReturn2018 (13.06%) [3]
Annual Return 2019 rr_AnnualReturn2019 25.06% [3]
Annual Return 2020 rr_AnnualReturn2020 15.93% [3]
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.93%
5 Years rr_AverageAnnualReturnYear05 11.41%
Since Inception rr_AverageAnnualReturnSinceInception 9.78%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2015
Trillium ESG Small/Mid Cap Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 15.90%
5 Years rr_AverageAnnualReturnYear05 10.71%
Since Inception rr_AverageAnnualReturnSinceInception 9.13%
Trillium ESG Small/Mid Cap Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 9.46%
5 Years rr_AverageAnnualReturnYear05 8.92%
Since Inception rr_AverageAnnualReturnSinceInception 7.61%
Trillium ESG Small/Mid Cap Fund | Retail Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.12%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.79%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.33% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 135
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 588
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,066
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,389
[1] The Global Equity Fund’s year-to-date return as of September 30, 2021 was 13.53%
[2] Trillium Asset Management, LLC (the “Adviser” or “Trillium”) has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes, extraordinary expenses, Rule 12b-1 fees, shareholder servicing fees and any other class-specific expenses) in order to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement to 0.98% of the SMID Fund’s average daily net assets (the “Expense Cap”). The Expense Cap is indefinite, but will remain in effect until at least October 31, 2022. The Expense Cap may be terminated at any time by the Trust’s Board of Trustees (the “Board”) upon 60 days’ notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years from the date the fees were waived and/or expenses were paid. This reimbursement may be requested if the aggregate amount actually paid by the SMID Fund toward operating expenses for such period (taking into account any reimbursement) does not exceed the lesser of the Expense Caps in place at the time of waiver or at the time of reimbursement.
[3] The SMID Fund’s year-to-date return as of September 30, 2021 was 14.88%