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Domini Impact Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading DOMINI IMPACT EQUITY FUNDSM
Objective [Heading] rr_ObjectiveHeading Investment objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide its shareholders with long-term 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, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for Class A sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Investor or Class A shares of the Domini Impact Equity Fund or the Domini Impact International Equity Fund. More information about these and other discounts is available from your financial professional or in the Fund’s prospectus on page A‑15 under the heading “How Sales Charges Are Calculated for Class A Shares” and on page C‑1 under the heading “Intermediary-Defined Sales Charge Waiver Policies,” and in the Fund’s Statement of Additional Information (“SAI”) on page 40 under the heading “Additional Information Regarding Class A Sales Charges.” 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, 2022
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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Investor or Class A shares of the Domini Impact Equity Fund or the Domini Impact International Equity Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 The Fund may invest in equity securities of companies of any market capitalization, but under normal circumstances, the Fund primarily invests in mid‑ and large-capitalization U.S. companies. 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 equity securities and related investments with similar economic characteristics, including derivative instruments such as futures and options. For purposes of the Fund’s investment policies, equity securities include common stocks, depositary receipts, warrants, rights, and preferred shares. It is expected that at least 80% of the Fund’s assets will be invested in mid‑ to large-capitalization companies under normal market conditions.
The Fund may also invest in companies organized or traded outside the U.S. The Fund may have significant exposure to securities of issuers in the information technology, consumer discretionary, health care, communication services, and financials sectors.
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”). All of the investment selections made by the Adviser are 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”).
The Fund may, but is not required to, invest in companies that, in addition to being subject to environmental and social factors, also demonstrate a commitment to sustainability solutions. The Adviser will consider a company to demonstrate a commitment to sustainability solutions if, based on the Adviser’s analysis, the company provides, invests in or creates products or services that help: accelerate the transition to a low‑carbon future, contribute to the development of sustainable communities, ensure access to clean water, support more sustainable food systems, promote societal health and well-being, broaden financial inclusion, or bridge the digital divide and/or expand access to economic opportunity.
A security will be sold if the Adviser determines that the company is no longer eligible for investment based on the Adviser’s ongoing evaluation of environmental and social factors, financial criteria, and/or the company no longer demonstrates a commitment to sustainability solutions, as applicable.
SSGA Funds Management, Inc. (the “Subadviser”), the Fund’s subadviser, will purchase or sell securities to implement the Adviser’s investment selections at a
time determined appropriate by the Subadviser and in accordance with, but not necessarily in the identical amounts as provided with the Adviser’s investment selections.
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 on 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.
  •  
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 Risk. 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 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.
  •  
Mid‑ to Large‑Cap Companies Risk. The market prices of companies at different capitalization levels may go up or down due to general market conditions and cycles. The value of your investment will be affected by the Fund’s exposure to mid‑ and large‑cap companies. Compared to large companies, mid‑size companies, and the market for their equity securities, may be more sensitive to changes in earnings results and investor expectations, have more limited product lines, capital resources and depth of management, experience sharper swings in market values, have limited liquidity, be harder to value or to sell at the times and prices the adviser thinks appropriate, and offer greater potential for gain and loss.
  •  
Small‑Cap Companies Risk. Compared to large companies, small‑size companies, and the market for their equity securities, may be more sensitive to changes in earnings results and investor expectations, have more limited product lines, capital resources and depth of management, experience sharper swings in market values, have limited liquidity, be
 
harder to value or to sell at the times and prices the adviser thinks appropriate, and offer greater potential for gain and loss.
  •  
Foreign Investing Risk. Investments in foreign regions or in securities of issuers with significant exposure to foreign markets 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, imposition of currency controls or restrictions, 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. Foreign investing risk also involves the risk of negative foreign currency rate fluctuations, which may cause the value of securities denominated in such foreign currency (or other instruments through which the Fund has exposure to foreign currencies) to decline in value. Currency exchange rates may fluctuate significantly over short periods of time. These risks may be more pronounced in connection with the Fund’s investments in securities of issuers located in emerging market countries.
  •  
Market Sector Risk. The Fund may hold a large percentage of securities in a particular market sector. To the extent the Fund holds a large percentage of securities in a particular 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 or risks affecting such market sector than a Fund without the same focus.
  -
Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by the loss or impairment of such rights.
  -
Consumer Discretionary Sector Risk. Securities in the consumer discretionary sector, such as consumer durables, hotels, restaurants, media, retailing and automobiles, may be significantly affected by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes.
  -
Health Care Sector Risk. Securities in the health care sector, such as health care supplies, health care services, biotechnology and pharmaceuticals, may be significantly affected by government regulation and reimbursement rates, approval of products by government agencies, and patent expirations and litigation.
  -
Communication Services Sector Risk. Companies in the communications sector may be affected by industry competition, substantial capital requirements, government regulation, cyclicality
 
of revenues and earnings, obsolescence of communications products and services due to technological advancement, a potential decrease in the discretionary income of targeted individuals and changing consumer tastes and interests.
  -
Financials Sector Risk. Issuers in the financials 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.
  •  
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 or accelerate taxable gains or transaction costs, 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 to the Fund and its shareholders, 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 Standard and Poor’s 500 Index (S&P 500), an unmanaged index of common stocks. SSGA Funds Management, Inc. commenced submanagement services for the Fund on December 1, 2018. A different subadviser served as the Fund’s subadviser for periods prior to December 1, 2018. The performance shown for periods prior to December 1, 2018, reflects the investment strategies employed during those periods. The returns for each class of the Fund will differ from Investor shares because of the different expenses applicable to those share classes.
Updated information on the Fund’s investment results can be obtained by visiting domini.com/performance or 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 Standard and Poor’s 500 Index (S&P 500), an unmanaged index of common stocks.
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: 23.39% (quarter ended 6/30/2020) and –15.46% (quarter ended 3/31/2020). The Fund’s year‑to‑date results as of the most recent calendar quarter ended 09/30/2021 were 11.19%.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2020 (with maximum sales charge for Class A shares)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads (with maximum sales charge for Class A shares)
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 Equity Fund | Investor  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption dsit_MaximumSalesChargeImposedOnPurchasesOverOfferingPriceOne none
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 0.20%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Sponsorship fee rr_Component1OtherExpensesOverAssets 0.45% [2]
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.19%
Total other expenses rr_OtherExpensesOverAssets 0.64%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.09%
Fee waiver and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets [3]
Total annual Fund operating expenses after fee waiver and expense reimbursements rr_NetExpensesOverAssets 1.09%
1 Year rr_ExpenseExampleYear01 $ 111
3 Years rr_ExpenseExampleYear03 347
5 Years rr_ExpenseExampleYear05 601
10 Years rr_ExpenseExampleYear10 1,329
1 Year rr_ExpenseExampleNoRedemptionYear01 111
3 Years rr_ExpenseExampleNoRedemptionYear03 347
5 Years rr_ExpenseExampleNoRedemptionYear05 601
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,329
2011 rr_AnnualReturn2011 0.74%
2012 rr_AnnualReturn2012 11.33%
2013 rr_AnnualReturn2013 32.85%
2014 rr_AnnualReturn2014 13.97%
2015 rr_AnnualReturn2015 (7.27%)
2016 rr_AnnualReturn2016 11.24%
2017 rr_AnnualReturn2017 15.42%
2018 rr_AnnualReturn2018 (9.08%)
2019 rr_AnnualReturn2019 31.66%
2020 rr_AnnualReturn2020 30.62%
Year to Date Return, Label rr_YearToDateReturnLabel year‑to‑date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 11.19%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.46%)
1 Year rr_AverageAnnualReturnYear01 30.62%
5 Years rr_AverageAnnualReturnYear05 14.96%
10 Years rr_AverageAnnualReturnYear10 12.20%
Domini Impact Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption dsit_MaximumSalesChargeImposedOnPurchasesOverOfferingPriceOne none [4]
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 0.20%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Sponsorship fee rr_Component1OtherExpensesOverAssets 0.45% [2]
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.41%
Total other expenses rr_OtherExpensesOverAssets 0.86%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.31%
Fee waiver and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total annual Fund operating expenses after fee waiver and expense reimbursements rr_NetExpensesOverAssets 1.09%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments of $1 million or more are not subject to a front‑end sales charge, but generally will be subject to a deferred sales charge of 1.00% if redeemed within one year of purchase.
1 Year rr_ExpenseExampleYear01 $ 581
3 Years rr_ExpenseExampleYear03 850
5 Years rr_ExpenseExampleYear05 1,139
10 Years rr_ExpenseExampleYear10 1,961
1 Year rr_ExpenseExampleNoRedemptionYear01 581
3 Years rr_ExpenseExampleNoRedemptionYear03 850
5 Years rr_ExpenseExampleNoRedemptionYear05 1,139
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,961
1 Year rr_AverageAnnualReturnYear01 24.41%
5 Years rr_AverageAnnualReturnYear05 13.84%
10 Years rr_AverageAnnualReturnYear10 11.66%
Domini Impact Equity Fund | Institutional  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption dsit_MaximumSalesChargeImposedOnPurchasesOverOfferingPriceOne none
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 0.20%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Sponsorship fee rr_Component1OtherExpensesOverAssets 0.45% [2]
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.09%
Total other expenses rr_OtherExpensesOverAssets 0.54%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.74%
Fee waiver and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets [3]
Total annual Fund operating expenses after fee waiver and expense reimbursements rr_NetExpensesOverAssets 0.74%
1 Year rr_ExpenseExampleYear01 $ 76
3 Years rr_ExpenseExampleYear03 237
5 Years rr_ExpenseExampleYear05 411
10 Years rr_ExpenseExampleYear10 918
1 Year rr_ExpenseExampleNoRedemptionYear01 76
3 Years rr_ExpenseExampleNoRedemptionYear03 237
5 Years rr_ExpenseExampleNoRedemptionYear05 411
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 918
1 Year rr_AverageAnnualReturnYear01 31.09%
5 Years rr_AverageAnnualReturnYear05 15.36%
10 Years rr_AverageAnnualReturnYear10 12.62%
Domini Impact Equity Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption dsit_MaximumSalesChargeImposedOnPurchasesOverOfferingPriceOne none
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 0.20%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Sponsorship fee rr_Component1OtherExpensesOverAssets 0.45% [2]
Other miscellaneous expenses rr_Component2OtherExpensesOverAssets 0.40%
Total other expenses rr_OtherExpensesOverAssets 0.85%
Total annual Fund operating expenses rr_ExpensesOverAssets 1.05%
Fee waiver and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.25%) [3]
Total annual Fund operating expenses after fee waiver and expense reimbursements rr_NetExpensesOverAssets 0.80%
1 Year rr_ExpenseExampleYear01 $ 82
3 Years rr_ExpenseExampleYear03 309
5 Years rr_ExpenseExampleYear05 555
10 Years rr_ExpenseExampleYear10 1,260
1 Year rr_ExpenseExampleNoRedemptionYear01 82
3 Years rr_ExpenseExampleNoRedemptionYear03 309
5 Years rr_ExpenseExampleNoRedemptionYear05 555
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,260
1 Year rr_AverageAnnualReturnYear01 30.98%
5 Years rr_AverageAnnualReturnYear05 15.27%
10 Years rr_AverageAnnualReturnYear10 12.53%
Domini Impact Equity Fund | Return after taxes on distributions | Investor  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 29.61%
5 Years rr_AverageAnnualReturnYear05 13.47%
10 Years rr_AverageAnnualReturnYear10 11.05%
Domini Impact Equity Fund | Return after taxes on distributions and sale of shares | Investor  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.48%
5 Years rr_AverageAnnualReturnYear05 11.56%
10 Years rr_AverageAnnualReturnYear10 9.78%
Domini Impact Equity Fund | S&P 500 (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
10 Years rr_AverageAnnualReturnYear10 13.88%
[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]
Sponsorship fee is for administrative services provided to the Fund by the Fund’s Adviser.
[3]
The Fund’s Adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor, Class A, Institutional, and Class Y share expenses to 1.09%, 1.09%, 0.74%, and 0.80%, respectively. These expense limitations are in effect through November 30, 2022. 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.
[4]
Investments of $1 million or more are not subject to a front‑end sales charge, but generally will be subject to a deferred sales charge of 1.00% if redeemed within one year of purchase.