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Domini Impact Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading DOMINI IMPACT BOND FUNDSM
Objective [Heading] rr_ObjectiveHeading Investment objective:
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock The Fund seeks to provide its shareholders with a high level of current income and total return.
Expense [Heading] rr_ExpenseHeading Fees and expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. If you invest in Institutional or Class Y shares of the Fund through an investment professional or financial intermediary, that investment professional or financial intermediary may charge you a commission in an amount determined and separately disclosed to you by that investment professional or financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder 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 November 30, 2021
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover:
Portfolio Turnover [Text Block] 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, affect the Fund’s performance but are already reflected in its total returns. During the most recent fiscal year, the Fund’s portfolio turnover rate was 469% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 469.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are based on estimated amounts for the current fiscal year.
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 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, that your investment has a 5% return each year, and that the Fund’s operating expenses (reflecting applicable contractual fee waivers and expense reimbursement arrangements) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be as follows:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Share classes(whether or not shares are redeemed)
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Share classes(whether or not shares are redeemed)
Strategy [Heading] rr_StrategyHeading Principal investment strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Fund invests at least 80% of its assets in investment-grade securities and maintains an effective duration within two years (plus or minus) of the portfolio duration of the securities comprising the Bloomberg Barclays U.S. Aggregate Bond Index as calculated by the subadviser. Under normal circumstances, at least 80% of the Fund’s net assets (plus the amount of borrowings, if any, for investment purposes) will be invested in bonds, including government and corporate bonds, mortgage-backed and asset-backed securities,
non-U.S.
dollar denominated bonds, and U.S. dollar denominated bonds issued by
non-U.S.
entities. The Fund’s investments in bonds also may include floating and variable rate loans, and municipal securities. A significant portion of the Fund’s assets may be invested in securities issued by government-sponsored entities such as Freddie Mac,
Fannie
Mae, and the Federal Home Loan Banks. A significant portion of the Fund’s assets may also be invested in “to be announced” securities, including mortgage dollar roll, when-issued, delayed delivery and forward commitment securities. A “to be announced” transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price at the time the contract is entered into but the mortgage-backed securities are delivered in the future, generally 30 days later. The Fund generally has a high rate of portfolio turnover as a consequence of investing in “to be announced” securities. The Fund may invest up to 20% of its net assets in below investment grade debt securities (sometimes referred to as “junk bonds”) or, if unrated, of equivalent credit quality as determined by the subadviser. The Fund may invest in privately issued mortgage-backed and asset-backed securities. The Fund may invest in securities that are in defaultand illiquid securities. The Fund’s investments may change significantly from time to time based on current market conditions and investment eligibility determinations.
Domini Impact Investments LLC (the “Adviser”), the Fund’s adviser, seeks to identify investment opportunities for the Fund that create positive environmental and social outcomes for people and the planet while seeking competitive financial returns (“Impact Investing”). The Adviser identifies securities that are eligible for investment by the Fund based on the evaluation of environmental and social factors including the core business in which a company engages and/or how a company treats its key stakeholders, such as its customers, employees, suppliers, ecosystems, local, national and global communities, and/or investors (“environmental and social factors”).
Wellington Management Company LLP (the “Subadviser”), the Fund’s subadviser, uses proprietary fundamental research to select investments to buy and sell from among those which the Adviser has notified the Subadviser are eligible for investment, based upon an identification of structural, cyclical and opportunistic themes, as well as individual sector and security characteristics. The Fund also will sell securities that the Adviser determines are no longer eligible for investment based on the Adviser’s ongoing evaluation of environmental and social factors.
Risk [Heading] rr_RiskHeading Principal risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly in the short and long term. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose all or part of your investment in the Fund or your investment may not perform as well as other similar investments. There is no guarantee that the Fund’s investment objective will be achieved. The following is a summary description of certain risks of investing in the Fund. Each risk summarized below is a principal risk of investing in the Fund and different risks may be more significant at different times depending upon market conditions or other factors.
 
•
 
Impact Investing Risk.
The adviser’s evaluation of environmental and social factors in its investment selections and the timing of the Subadviser’s implementation of the Adviser’s investment selections will affect the Fund’s exposure to certain issuers, industries, sectors, regions, and countries and may impact the relative financial performance of the Fund — positively or negatively — depending on whether such investments are in or out of favor.
 
 
•
 
Portfolio Management Risk
. The value of your investment may decrease if the Adviser’s or Subadviser’s judgment about the attractiveness or value of, or market trends affecting a particular security, industry, sector or region, or about market movements, is incorrect or does not produce the desired results. In addition, the Fund’s investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the Adviser or Subadviser and could have an adverse effect on the value or performance of the Fund.
 
•
 
Style Risk.
The value of your investment may decrease if the Subadviser’s investment strategy does not respond well to current market conditions or its judgment regarding the quality, value, or market trends affecting a particular security, industry, sector or region is incorrect.
 
 
•
 
Information Risk.
There is a risk that information used by the Adviser to evaluate environmental and social factors, may not be readily available, complete, or accurate, which could negatively impact the Adviser’s ability to evaluate such factors and negatively impact Fund performance. This may also lead the Fund to avoid investment in certain issuers, industries, markets, sectors, or regions.
 
 
•
 
Market Risk.
The market values of securities or other assets will fluctuate, sometimes sharply and unpredictably, due to changes in general market conditions, overall economic trends or events, governmental actions or intervention, market disruptions caused by trade disputes or other factors, political developments, recessions, the spread of infectious illness or other public health issues, investor sentiment and other factors that may or may not be related to the issuer of the security or other asset. If the market values of the securities or other assets held by the Fund fall, including a complete loss on any individual security, the value of your investment will go down. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading or tariff arrangements, terrorism, natural disasters, global pandemics and other circumstances in one country or region could have profound impacts on global economies or markets. As a result, whether or not the Fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the Fund’s investments may be negatively affected.
 
 
•
 
Recent events.
The illness
COVID-19
caused by a novel coronavirus has resulted in a global pandemic and major disruption to economies and markets around the world, including the United States. Global financial markets have experienced extreme volatility and severe losses, and trading in many instruments has been disrupted. Liquidity for many instruments has been greatly reduced for periods of time. Some interest rates are very low and in some cases yields are negative. Some sectors of the economy and individual issuers have experienced particularly large losses. These circumstances may continue for an extended period of time and may adversely affect the value and/or liquidity of the Fund’s investments. In addition, the impact of infectious illnesses in emerging market countries may be greater due to generally less established healthcare systems. Public health crises caused by the
COVID-19
outbreak may exacerbate other
pre-existing
political, social and economic risks in certain countries or globally. The ultimate economic fallout from the pandemic, and the long-term impact on economies, markets, industries and individual issuers, are not known. Governments and central banks, including the Federal Reserve in the U.S., have taken extraordinary and unprecedented actions to support national economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The impact of these
 
measures, and whether they will be effective to mitigate the economic and market disruption, may not be known for some time. The consequences of high public debt, including its future impact on the economy and securities markets, likewise may not be known for some time.
 
 
•
 
Interest Rate Risk.
The value of your investment will fluctuate with changes in interest rates. If interest rates rise, the price of a fixed-income security declines and will generally reduce the value of the Fund’s share price. A rise in rates tends to have a greater impact on securities with longer maturities or higher durations. However, calculations of maturity and duration may be based on estimates and may not reliably predict a security’s price sensitivity to changes in interest rates. A general rise in interest rates could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the Fund.
 
 
•
 
Credit Risk.
Fixed-income securities are subject to credit risk. Credit risk is the possibility that an issuer will fail to make timely payments of interest or principal or go bankrupt. The lower the ratings of such debt securities, the greater their risks. In addition, lower-rated securities have higher risk characteristics, and changes in economic conditions are likely to cause issuers of these securities to be unable to meet their obligations. Below investment grade securities (sometimes referred to as “junk bonds”) involve greater risk of default or downgrade and are more volatile than investment grade securities. Below investment grade securities may also be less liquid than higher-quality securities.
 
 
•
 
Prepayment and Extension Risk.
Many issuers have a right to prepay their securities. Issuers may be more likely to prepay their securities if interest rates fall. If this happens, the Fund will not benefit from the rise in market price that normally accompanies a decline in interest rates and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on prepaid securities. The Fund also may lose any premium it paid on the security. When interest rates rise, repayments of fixed-income securities, particularly asset-backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone.
 
 
•
 
Liquidity Risk.
The Fund may make investments that are illiquid or that become illiquid after purchase. The liquidity and value of investments can deteriorate rapidly, and they may become difficult to purchase or sell, or may be illiquid, particularly during times of market turmoil. Illiquid securities also may be difficult to value. Markets may become illiquid when, for instance, there are few, if any, interested buyers or sellers or when dealers are unwilling or unable to make markets for certain securities. Due to limitations on investments in illiquid securities, the Fund may be unable to achieve its desired level of exposure to certain sectors. If the Fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the Fund may be forced to sell such securities at a loss.
 
•
 
Government-Sponsored Entities Risk.
The Fund’s investments in securities issued by government-sponsored entities such as Fannie Mae, Freddie Mac, and the Federal Home Loan Bank are not guaranteed or insured by the U.S. government and may decline in value.
 
 
•
 
Mortgage-related and asset-backed securities risk.
The value of mortgage-related and asset-backed securities will be influenced by factors affecting the real estate market and the assets underlying such securities. As a result, during periods of declining asset value, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities tend to be more sensitive to changes in interest rate than other types of debt securities. These securities are also subject to prepayment and extension risks. Prepayment risk is generally lower with respect to delegated underwriting and servicing (“DUS”) bonds issued with prepayment penalties that help protect an investor in case of voluntary repayment by the underlying borrower. Some of these securities may receive little or no collateral protection from the underlying assets and are thus subject to the risk of default. The risk of such defaults is generally higher in the case of mortgage-backed investments offered by
non-governmental
issuers and those that include
so-called
“sub-prime”
mortgages. The structure of some of these securities may be complex and there may be less available information than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.
 
 
•
 
Floating and Variable Rate Loans Risk.
Floating rate loans and similar investments may be volatile, illiquid or less liquid than other investments and difficult to value. The value of loan collateral can decline, be difficult to liquidate, or insufficient to meet the issuer’s obligations. To the extent that sale proceeds of loans are not available, the Fund may sell securities that have shorter settlement periods or may access other sources of liquidity to meet redemption requests.
 
 
•
 
Risks relating to investments in Municipal Securities.
Municipal issuers may be adversely affected by rising health care costs, increasing unfunded pension liabilities, and by the phasing out of federal programs providing financial support. Unfavorable conditions and developments relating to projects financed with municipal securities can result in lower revenues to issuers of municipal securities, potentially resulting in defaults. The value of municipal securities can also be adversely affected by changes in the financial condition of one or more individual municipal issuers or insurers of municipal issuers, regulatory and political developments, tax law changes or other legislative actions, and by uncertainties and public perceptions concerning these and other factors. In recent periods an increasing number of municipal issuers have defaulted on obligations, been downgraded or commenced insolvency proceedings. Financial difficulties of municipal issuers may continue or worsen.
 
•
 
Mortgage Dollar Roll Transactions Risk.
The benefits to the Fund from mortgage dollar roll transactions depend upon the Subadviser’s ability to forecast mortgage prepayment patterns on different mortgage pools. The Fund may lose money if, during the period between the time it agrees to the forward purchase of the mortgage securities and the settlement date, these securities decline in value due to market conditions or prepayments on the underlying mortgages.
 
 
•
 
To Be Announced (TBA) Securities Risk.
TBA securities involve the risk that the security the Fund buys will lose value prior to its delivery. There also is the risk that the security will not be issued or that the other party to the transaction will not meet its obligation. If this occurs, the Fund could lose both the investment opportunity for the assets it set aside to pay for the security and any gain in the security’s price.
 
 
•
 
Foreign Investing Risk.
Investments in foreign regions may be more volatile and less liquid than U.S. investments due to adverse political, social, and economic developments, such as nationalization or expropriation of assets, confiscatory taxation, terrorism and political or financial instability; regulatory differences, such as accounting, auditing, and financial reporting standards and practices; natural disasters; and the degree of government oversight and supervision. Less information may be publicly available regarding foreign issuers.
 
 
•
 
Currency Risk.
Fluctuations between the U.S. dollar and foreign currency exchange rates could negatively affect the value of the Fund’s investments. This fluctuation can affect both the value of the currencies in which the Fund’s investments are traded or an active investment position. The Fund will benefit when foreign currencies strengthen against the dollar and will be hurt when foreign currencies weaken against the dollar. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of U.S. and foreign governments or central banks, the imposition of currency controls or restrictions, speculation, and the spread of infectious illness or other public health issues. Devaluation of a currency by a country’s government or banking authority also will have a significant impact on the value of any investments denominated in that currency. Currency markets generally are not as regulated as securities markets, may be riskier than other types of investments and may increase the volatility of the Fund.
 
 
•
 
Market Sector Risk.
The Fund may hold a large percentage of securities in a single market sector (e.g., financials). To the extent a Fund holds a large percentage of securities in a single sector, its performance will be tied closely to and affected by the performance of that sector, and the Fund will be subject to a greater degree to any market price movements, regulatory or technological change, economic conditions, the spread of infectious illness or other public health issues, or other developments affecting such market sectors than a Fund without the same focus.
 
 
-
Financial Sector Risk.
Issuers in the financial sector, such as banks, insurance companies and broker-dealers, may be sensitive to changes in interest rates and general economic activity and are generally subject to extensive government regulation.
 
 
•
 
Portfolio Turnover Risk.
If the Fund does a lot of trading it may incur additional operating expenses which would reduce performance and could cause shareowners to incur a higher level of taxable income or capital gains. In addition, investment in mortgage dollar rolls and participation in
to-be-announced
(“TBA”) transactions may significantly increase the Fund’s portfolio turnover rate.
 
 
•
 
Valuation Risk.
The sales price the Fund could receive for any particular portfolio investment may differ from the Fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. These differences may increase significantly and affect Fund investments more broadly during periods of market volatility. Investors who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the securities or had used a different valuation methodology. The Fund’s ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third-party service providers.
 
 
•
 
Redemption Risk.
The Fund may experience heavy redemptions that could cause it to liquidate its assets at inopportune times or at a loss or depressed value, which could cause the value of your investment to decline.
 
 
•
 
Cybersecurity Risk.
Cybersecurity failures by or breaches of the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent or other service providers may disrupt Fund operations, interfere with the Fund’s ability to calculate its NAV, prevent Fund shareholders from purchasing, redeeming or exchanging shares or receiving distributions, cause loss of or unauthorized access to private shareholder information, and result in financial losses, regulatory fines, penalties, reputational damage, or additional compliance costs.
These and other risks are discussed in more detail later in this prospectus or in the SAI. Please note that there are many other factors that could adversely affect your investment and that could prevent the Fund from achieving its goals.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose all or part of your investment in the Fund or your investment may not perform as well as other similar investments.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Investment results:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year for Investor shares and by showing how the Fund’s average annual total returns for 1, 5, and 10 years compare with those of a broad measure of market performance, the Bloomberg Barclays U.S. Aggregate Bond Index, an index representing securities that are U.S. domestic, taxable, and dollar denominated and covering the U.S investment grade fixed rate bond market, with index components for government and corporate securities and asset-backed securities. Wellington Management commenced submanagement services for the Fund on January 7, 2015. A different subadviser served as the Fund’s subadviser for periods prior to January 6, 2015. The returns for each class of the Fund will differ from Investor shares because of the different expenses applicable to those share classes. The returns presented in the table for periods prior to the inception of the Institutional and Class Y shares are those of the Investor shares. Institutional shares commenced operations on November 30, 2011. The Class Y shares were not offered prior to June 15, 2018 and have not commenced operations as of the date of this prospectus. These returns have not been adjusted to take into account the expenses applicable to
Institutional
and Class Y
shares
.
Updated information on the Fund’s investment results can be obtained by visiting
domini.com/performance
and by calling
1-800-582-6757.
The Fund’s past results (before and after taxes) are not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year for Investor shares and by showing how the Fund’s average annual total returns for 1, 5, and 10 years compare with those of a broad measure of market performance, the Bloomberg Barclays U.S. Aggregate Bond Index, an index representing securities that are U.S. domestic, taxable, and dollar denominated and covering the U.S investment grade fixed rate bond market, with index components for government and corporate securities and asset-backed securities.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Class Y shares were not offered prior to June 15, 2018 and have not commenced operations as of the date of this prospectus.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-582-6757
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress domini.com/performance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past results (before and after taxes) are not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Average Annual Total Return (%) Calendar years ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Highest/lowest quarterly results during this time period were: 3.24% (quarter ended 06/30/2019) and –3.21% (quarter ended 12/31/2016). The Fund’s
year-to-date
results as of the most recent calendar quarter ended 09/30/2020 were 8.48%.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual marginal federal income tax rates in effect during each year of the periods shown and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above. In addition, after-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as a 401(k) plan or individual retirement account (IRA).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Investor shares; after-tax returns for other share classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax
returns are shown only for Investor shares;
after-tax
returns for other share classes will vary.
After-tax
returns are calculated using the highest individual marginal federal income tax rates in effect during each year of the periods shown and do not reflect the impact of state and local taxes. Your actual
after-tax
returns depend on your individual tax situation and likely will differ from the results shown above. In addition,
after-tax
returns are not relevant to investors who hold their Fund shares through
tax-deferred
arrangements, such as a 401(k) plan or individual retirement account (IRA).
Domini Impact Bond Fund | Investor  
Risk/Return: rr_RiskReturnAbstract  
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 2.00%
Paper document delivery fee (choose e-delivery to avoid this fee) rr_MaximumAccountFee $ 15 [1]
Outgoing bank wire transfer fee (deducted directly from sale proceeds) rr_ShareholderFeeOther $ 15
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Administrative services fee rr_Component1OtherExpensesOverAssets 0.25%
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.33%
Total Other Expenses rr_OtherExpensesOverAssets 0.58%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.15%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.87%
1 Year rr_ExpenseExampleYear01 $ 89
3 Years rr_ExpenseExampleYear03 338
5 Years rr_ExpenseExampleYear05 606
10 Years rr_ExpenseExampleYear10 1,373
1 Year rr_ExpenseExampleNoRedemptionYear01 89
3 Years rr_ExpenseExampleNoRedemptionYear03 338
5 Years rr_ExpenseExampleNoRedemptionYear05 606
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,373
2010 rr_AnnualReturn2010 4.74%
2011 rr_AnnualReturn2011 5.85%
2012 rr_AnnualReturn2012 2.50%
2013 rr_AnnualReturn2013 (1.97%)
2014 rr_AnnualReturn2014 3.74%
2015 rr_AnnualReturn2015 (0.46%)
2016 rr_AnnualReturn2016 3.44%
2017 rr_AnnualReturn2017 3.85%
2018 rr_AnnualReturn2018 (0.91%)
2019 rr_AnnualReturn2019 9.14%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 8.48%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.24%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.21%)
1 Year rr_AverageAnnualReturnYear01 9.14%
5 Years rr_AverageAnnualReturnYear05 2.95%
10 Years rr_AverageAnnualReturnYear10 2.94%
Domini Impact Bond Fund | Institutional  
Risk/Return: rr_RiskReturnAbstract  
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 2.00%
Paper document delivery fee (choose e-delivery to avoid this fee) rr_MaximumAccountFee $ 15 [1]
Outgoing bank wire transfer fee (deducted directly from sale proceeds) rr_ShareholderFeeOther $ 15
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Administrative services fee rr_Component1OtherExpensesOverAssets 0.25%
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.17%
Total Other Expenses rr_OtherExpensesOverAssets 0.42%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.74%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.57%
1 Year rr_ExpenseExampleYear01 $ 58
3 Years rr_ExpenseExampleYear03 219
5 Years rr_ExpenseExampleYear05 395
10 Years rr_ExpenseExampleYear10 902
1 Year rr_ExpenseExampleNoRedemptionYear01 58
3 Years rr_ExpenseExampleNoRedemptionYear03 219
5 Years rr_ExpenseExampleNoRedemptionYear05 395
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 902
1 Year rr_AverageAnnualReturnYear01 9.42%
5 Years rr_AverageAnnualReturnYear05 3.23%
10 Years rr_AverageAnnualReturnYear10 2.94%
Domini Impact Bond Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption 2.00%
Paper document delivery fee (choose e-delivery to avoid this fee) rr_MaximumAccountFee $ 15 [1]
Outgoing bank wire transfer fee (deducted directly from sale proceeds) rr_ShareholderFeeOther $ 15
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Administrative services fee rr_Component1OtherExpensesOverAssets 0.25%
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.22% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.47%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.79%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [2]
Total Annual Fund Operating Expenses after Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.65%
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 238
5 Years rr_ExpenseExampleYear05 425
10 Years rr_ExpenseExampleYear10 965
1 Year rr_ExpenseExampleNoRedemptionYear01 66
3 Years rr_ExpenseExampleNoRedemptionYear03 238
5 Years rr_ExpenseExampleNoRedemptionYear05 425
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 965
1 Year rr_AverageAnnualReturnYear01 9.14%
5 Years rr_AverageAnnualReturnYear05 2.95%
10 Years rr_AverageAnnualReturnYear10 2.94%
Domini Impact Bond Fund | After Taxes on Distributions | Investor  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.10%
5 Years rr_AverageAnnualReturnYear05 1.93%
10 Years rr_AverageAnnualReturnYear10 1.95%
Domini Impact Bond Fund | After Taxes on Distributions and Sales | Investor  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.39%
5 Years rr_AverageAnnualReturnYear05 1.80%
10 Years rr_AverageAnnualReturnYear10 1.90%
[1] Paper document delivery fee applies to direct Fund accounts with balances below $10,000 and may be avoided by choosing e-delivery of Fund statements, prospectuses, and reports.
[2] The Fund’s adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor, Institutional share, and Class Y expenses to 0.87%, 0.57%, and 0.65%, respectively. These expense limitations are in effect through November 30, 2021. There can be no assurance that the Adviser will extend the expense limitations beyond such time. While in effect, the arrangement may be terminated for a class only by agreement of the Adviser and the Fund’s Board of Trustees.
[3] Other expenses are based on estimated amounts for the current fiscal year.