485BPOS

As filed with the Securities and Exchange Commission on December 6, 2018

Registration Nos. 33-29180

and 811-05823

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

POST-EFFECTIVE AMENDMENT NO. 67

AND

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 69

DOMINI INVESTMENT TRUST

(Exact Name of Registrant as Specified in Charter)

180 Maiden Lane, Suite 1302, New York, New York 10038-4925

(Address of Principal Executive Offices)

Registrant’s Telephone Number, including Area Code: 212-217-1100

Amy Domini Thornton

Domini Impact Investments LLC

180 Maiden Lane, Suite 1302

New York, New York 10038-4925

(Name and Address of Agent for Service)

Copy To:

Roger P. Joseph, Esq.

Morgan Lewis & Bockius LLP

One Federal Street

Boston, Massachusetts 02110

It is requested that this filing become effective immediately upon filing pursuant to paragraph (b) of Rule 485 under the Securities Act of 1933, as amended.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York and the State of New York on the 6th day of December, 2018.

	DOMINI INVESTMENT TRUST on behalf of its series: Domini Impact Equity Fund Domini Impact Bond Fund Domini Impact International Equity Fund
By:	/s/ Carole M. Laible
	____________________________
	Carole M. Laible President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities indicated below on December 6, 2018.

Signature	Title
/s/Carole M. Laible Carole M. Laible	President (Principal Executive Officer)
/s/Christina M. Povall Christina M. Povall	Treasurer (Principal Accounting and Financial Officer) and Vice President of Domini Investment Trust
/s/Amy Domini Thornton Amy Domini Thornton	Trustee of Domini Investment Trust
Kirsten S. Moy* Kirsten S. Moy	Trustee of Domini Investment Trust
Gregory A. Ratliff* Gregory A. Ratliff	Trustee of Domini Investment Trust
John L. Shields* John L. Shields	Trustee of Domini Investment Trust
*By: /s/Amy Domini Thornton Amy Domini Thornton
Executed by Amy Domini Thornton on behalf of those indicated pursuant to Powers of Attorney dated July 26, 2018.

INDEX TO EXHIBITS

EXHIBIT NO.	DESCRIPTION OF EXHIBIT
EX – 101.INS	XBRL Instance Document
EX – 101.SCH	XBRL Taxonomy Extension Schema Document
EX – 101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX – 101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX – 101.LAB	XBRL Taxonomy Labels Linkbase
EX – 101.PRE	XBRL Taxonomy Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jul. 31, 2018
Registrant Name	dei_EntityRegistrantName	DOMINI INVESTMENT TRUST
Central Index Key	dei_EntityCentralIndexKey	0000851680
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Nov. 27, 2018
Document Effective Date	dei_DocumentEffectiveDate	Dec. 01, 2018
Prospectus Date	rr_ProspectusDate	Dec. 01, 2018
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A

XML

Domini Impact Equity Fund

DOMINI IMPACT EQUITY FUND^SM

<b>Investment objective:</b>

The Fund seeks to provide its shareholders with long-term total return.

<b>Fees and expenses of the Fund:</b>

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. 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 each Domini Fund, except the Domini Impact Bond Fund. More information about these and other discounts is available from your financial professional or in the Fund’s prospectus on page A-16 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 39 under the heading “Additional Information Regarding Class A Sales Charges.” If you invest in Institutional or Class R 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.

<b>Shareholder fees </b> (paid directly from your investment)

Shareholder Fees - Domini Impact Equity Fund - USD ($)		Investor	Class A		Institutional	Class R
Maximum sales charge (load) imposed on purchases as a percentage of offering price		none	4.75%		none	none
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption		none	none	[1],[2]	none	none
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable)		2.00%	2.00%		2.00%	2.00%
Paper document delivery fee (choose e-delivery to avoid this fee)	[3],[4]	$ 15	$ 15		$ 15	$ 15
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	[5]	$ 10	$ 10		$ 10	$ 10

<b>Annual Fund operating expenses </b><br/> (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Domini Impact Equity Fund		Investor	Class A	Institutional	Class R
Management fees	[1]	0.20%	0.20%	0.20%	0.20%
Distribution (12b-1) fees		0.25%	0.25%	none	none
Sponsorship fee	[2]	0.45%	0.45%	0.45%	0.45%
Other miscellaneous expenses		0.16%	0.44%	0.07%	0.15%
Total other expenses		0.61%	0.89%	0.52%	0.60%
Total annual Fund operating expenses		1.06%	1.34%	0.72%	0.80%
Fee waivers and expense reimbursements	[3]	none	(0.25%)	none	none
Total annual Fund operating expenses after fee waiver and expense reimbursements		1.06%	1.09%	0.72%	0.80%

<b>Example </b>

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:

<b>Share classes</b><br/>(whether or not shares are redeemed)

Expense Example - Domini Impact Equity Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	108	337	585	1,294
Class A	581	856	1,151	1,990
Institutional	74	230	401	894
Class R	82	255	444	990

<b>Share classes</b><br/>(whether or not shares are redeemed)

Expense Example, No Redemption - Domini Impact Equity Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	108	337	585	1,294
Class A	581	856	1,151	1,990
Institutional	74	230	401	894
Class R	82	255	444	990

<b>Portfolio turnover: </b>

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 78% of the average value of its portfolio.

<b>Principal investment strategies:</b>

The Fund may invest in equity securities of companies of any 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, preferred shares, equity interests in real estate investment trusts (REITs), and funds that invest primarily in equity securities. 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 technology, financial, health care and consumer discretionary sectors. The Fund may hold cash or other short-term investments to provide the Fund with the flexibility to meet redemptions and expenses and to readjust its portfolio holdings.

The Fund will invest in companies that Domini Impact Investments LLC (“Domini”) believes have strong environmental and social profiles. The Fund may also invest in companies that Domini believes help create products and services that provide sustainability solutions and are evaluated using fundamental analysis. The Fund may sell a security if the issuer fails to meet Domini’s social and environmental standards or sustainability themes. The Fund’s subadviser will purchase or sell securities at a time determined appropriate by the subadviser and in accordance with, but not necessarily identically to, the weights provided with Domini’s investment selections, or as necessary to manage the amount of the Fund’s assets to be held in short term investments.

While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater corporate accountability. Domini evaluates the Fund’s potential investments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of the issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time.

<b>Principal Risks:</b>

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 in alphabetical order.

• Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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.

• 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.

• Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards 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.

• Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, sectors, and regions may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards, which may negatively impact Fund performance. This may also lead the Fund to avoid investment in certain issuers, industries, markets, sectors, or regions.

• 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.

• Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests.

• 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.

• 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.

• 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.

• Market Sector Risk. The Fund may hold a large percentage of securities in a single market sector. To the extent the 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 or other developments or risks affecting such market sector than a fund without the same focus

• Technology Sector Risk. Securities in the technology sector, such as information technology, communications equipment, computer hardware and software, and office and scientific equipment, are generally subject to risks of rapidly evolving technology, short product lives, rates of corporate expenditures, falling prices and profits, competition from new market entrants, and general economic conditions.

• 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.

• 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.

• 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.

• 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.

• 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. 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.

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.

<b>Investment results:</b>

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. The returns presented in the table for periods prior to the inception of the Class A and Institutional shares, are those of the Investor shares. Class A shares and Institutional shares commenced operations on November 28, 2008.

These returns have not been adjusted to take into account the lower expenses applicable to Class A and Institutional shares, but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge. Updated information on the Fund’s investment results can be obtained by visiting www.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.

Average Annual Total Return (%)<br/><br/>Calendar years ended December 31

Highest/lowest quarterly results during this time period were: 20.58% (quarter ended 6/30/09) and –24.04% (quarter ended 12/31/08). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were 5.54%.

<b>Average annual total returns for periods ended December 31, 2017 </b><br/>(with maximum sales charge for Class A shares)

Average Annual Total Returns - Domini Impact Equity Fund	1 Year	5 Years	10 Years
Investor shares	15.42%	12.51%	6.83%
Investor shares | Return after taxes on distributions	14.02%	11.27%	6.18%
Investor shares | Return after taxes on distributions and sale of shares	9.85%	9.84%	5.43%
Class A shares	9.96%	11.41%	6.31%
Institutional shares	15.80%	12.93%	6.83%
Class R shares	15.85%	12.87%	7.19%
S&P 500 (reflects no deduction for fees, expenses, or taxes)	21.83%	15.79%	8.50%

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).

[1] (under $1 million)

[2] 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.

[3] /year

[4] 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.

[5] /transfer

[1] Restated to reflect current fees.

[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 Class A share expenses to 1.09%. The Class A share agreement expires on November 30, 2019, absent an earlier modification by the Fund's Board.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DOMINI INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 01, 2018
Domini Impact Equity Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DOMINI IMPACT EQUITY FUND<sup>SM</sup>
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective:</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide its shareholders with long-term total return.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the Fund:</b>
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. 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 each Domini Fund, except the Domini Impact Bond Fund. More information about these and other discounts is available from your financial professional or in the Fund’s prospectus on page A-16 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 39 under the heading “Additional Information Regarding Class A Sales Charges.” If you invest in Institutional or Class R 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	<b>Shareholder fees </b> (paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual Fund operating expenses </b><br/> (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, 2019
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover: </b>
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 78% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	78.00%
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 each Domini Fund, except the Domini Impact Bond Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Restated to reflect current fees.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example </b>
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	<b>Share classes</b><br/>(whether or not shares are redeemed)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Share classes</b><br/>(whether or not shares are redeemed)
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies:</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund may invest in equity securities of companies of any 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, preferred shares, equity interests in real estate investment trusts (REITs), and funds that invest primarily in equity securities. 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 technology, financial, health care and consumer discretionary sectors. The Fund may hold cash or other short-term investments to provide the Fund with the flexibility to meet redemptions and expenses and to readjust its portfolio holdings. The Fund will invest in companies that Domini Impact Investments LLC (“Domini”) believes have strong environmental and social profiles. The Fund may also invest in companies that Domini believes help create products and services that provide sustainability solutions and are evaluated using fundamental analysis. The Fund may sell a security if the issuer fails to meet Domini’s social and environmental standards or sustainability themes. The Fund’s subadviser will purchase or sell securities at a time determined appropriate by the subadviser and in accordance with, but not necessarily identically to, the weights provided with Domini’s investment selections, or as necessary to manage the amount of the Fund’s assets to be held in short term investments. While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater corporate accountability. Domini evaluates the Fund’s potential investments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of the issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time.
Risk [Heading]	rr_RiskHeading	<b>Principal Risks:</b>
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 in alphabetical order. Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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. 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. Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards 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. Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, sectors, and regions may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards, which may negatively impact Fund performance. This may also lead the Fund to avoid investment in certain issuers, industries, markets, sectors, or regions. 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. Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests. 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. 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. 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. Market Sector Risk. The Fund may hold a large percentage of securities in a single market sector. To the extent the 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 or other developments or risks affecting such market sector than a fund without the same focus Technology Sector Risk. Securities in the technology sector, such as information technology, communications equipment, computer hardware and software, and office and scientific equipment, are generally subject to risks of rapidly evolving technology, short product lives, rates of corporate expenditures, falling prices and profits, competition from new market entrants, and general economic conditions. 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. 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. 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. 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. 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. 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. 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	<b>Investment results:</b>
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. The returns presented in the table for periods prior to the inception of the Class A and Institutional shares, are those of the Investor shares. Class A shares and Institutional shares commenced operations on November 28, 2008. These returns have not been adjusted to take into account the lower expenses applicable to Class A and Institutional shares, but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge. Updated information on the Fund’s investment results can be obtained by visiting www.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	www.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 (%)<br/><br/>Calendar years ended December 31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest/lowest quarterly results during this time period were: 20.58% (quarter ended 6/30/09) and –24.04% (quarter ended 12/31/08). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were 5.54%.
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns for periods ended December 31, 2017 </b><br/>(with maximum sales charge for Class A shares)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge.
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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.20%	[4]
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Sponsorship fee	rr_Component1OtherExpensesOverAssets	0.45%	[5]
Other miscellaneous expenses	rr_Component2OtherExpensesOverAssets	0.16%
Total other expenses	rr_OtherExpensesOverAssets	0.61%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.06%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[6]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	1.06%
1 Year	rr_ExpenseExampleYear01	$ 108
3 Years	rr_ExpenseExampleYear03	337
5 Years	rr_ExpenseExampleYear05	585
10 Years	rr_ExpenseExampleYear10	1,294
1 Year	rr_ExpenseExampleNoRedemptionYear01	108
3 Years	rr_ExpenseExampleNoRedemptionYear03	337
5 Years	rr_ExpenseExampleNoRedemptionYear05	585
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,294
2008	rr_AnnualReturn2008	(37.88%)
2009	rr_AnnualReturn2009	35.56%
2010	rr_AnnualReturn2010	13.69%
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%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	5.54%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.58%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(24.04%)
1 Year	rr_AverageAnnualReturnYear01	15.42%
5 Years	rr_AverageAnnualReturnYear05	12.51%
10 Years	rr_AverageAnnualReturnYear10	6.83%
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	[7],[8]
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.20%	[4]
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Sponsorship fee	rr_Component1OtherExpensesOverAssets	0.45%	[5]
Other miscellaneous expenses	rr_Component2OtherExpensesOverAssets	0.44%
Total other expenses	rr_OtherExpensesOverAssets	0.89%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.34%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[6]
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	856
5 Years	rr_ExpenseExampleYear05	1,151
10 Years	rr_ExpenseExampleYear10	1,990
1 Year	rr_ExpenseExampleNoRedemptionYear01	581
3 Years	rr_ExpenseExampleNoRedemptionYear03	856
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,151
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,990
1 Year	rr_AverageAnnualReturnYear01	9.96%
5 Years	rr_AverageAnnualReturnYear05	11.41%
10 Years	rr_AverageAnnualReturnYear10	6.31%
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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.20%	[4]
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Sponsorship fee	rr_Component1OtherExpensesOverAssets	0.45%	[5]
Other miscellaneous expenses	rr_Component2OtherExpensesOverAssets	0.07%
Total other expenses	rr_OtherExpensesOverAssets	0.52%
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.72%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[6]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	0.72%
1 Year	rr_ExpenseExampleYear01	$ 74
3 Years	rr_ExpenseExampleYear03	230
5 Years	rr_ExpenseExampleYear05	401
10 Years	rr_ExpenseExampleYear10	894
1 Year	rr_ExpenseExampleNoRedemptionYear01	74
3 Years	rr_ExpenseExampleNoRedemptionYear03	230
5 Years	rr_ExpenseExampleNoRedemptionYear05	401
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 894
1 Year	rr_AverageAnnualReturnYear01	15.80%
5 Years	rr_AverageAnnualReturnYear05	12.93%
10 Years	rr_AverageAnnualReturnYear10	6.83%
Domini Impact Equity Fund | Class R
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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.20%	[4]
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Sponsorship fee	rr_Component1OtherExpensesOverAssets	0.45%	[5]
Other miscellaneous expenses	rr_Component2OtherExpensesOverAssets	0.15%
Total other expenses	rr_OtherExpensesOverAssets	0.60%
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.80%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[6]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	0.80%
1 Year	rr_ExpenseExampleYear01	$ 82
3 Years	rr_ExpenseExampleYear03	255
5 Years	rr_ExpenseExampleYear05	444
10 Years	rr_ExpenseExampleYear10	990
1 Year	rr_ExpenseExampleNoRedemptionYear01	82
3 Years	rr_ExpenseExampleNoRedemptionYear03	255
5 Years	rr_ExpenseExampleNoRedemptionYear05	444
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 990
1 Year	rr_AverageAnnualReturnYear01	15.85%
5 Years	rr_AverageAnnualReturnYear05	12.87%
10 Years	rr_AverageAnnualReturnYear10	7.19%
Domini Impact Equity Fund | Return after taxes on distributions | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.02%
5 Years	rr_AverageAnnualReturnYear05	11.27%
10 Years	rr_AverageAnnualReturnYear10	6.18%
Domini Impact Equity Fund | Return after taxes on distributions and sale of shares | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.85%
5 Years	rr_AverageAnnualReturnYear05	9.84%
10 Years	rr_AverageAnnualReturnYear10	5.43%
Domini Impact Equity Fund | S&P 500 (reflects no deduction for fees, expenses, or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	21.83%
5 Years	rr_AverageAnnualReturnYear05	15.79%
10 Years	rr_AverageAnnualReturnYear10	8.50%

[1] /year

[2] 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.

[3] /transfer

[4] Restated to reflect current fees.

[5] Sponsorship fee is for administrative services provided to the Fund by the Fund’s adviser.

[6] The Fund's adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Class A share expenses to 1.09%. The Class A share agreement expires on November 30, 2019, absent an earlier modification by the Fund's Board.

[7] (under $1 million)

[8] 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.

XML

Domini Impact International Equity Fund

DOMINI IMPACT INTERNATIONAL EQUITY FUND^SM

<b>Investment objective:</b>

The Fund seeks to provide its shareholders with long-term total return.

<b>Fees and expenses of the Fund:</b>

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. 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 each Domini Fund, except the Domini Impact Bond Fund. More information about these and other discounts is available from your financial professional or in the Fund’s prospectus on page 16 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 39 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.

<b>Shareholder fees </b> (paid directly from your investment)

Shareholder Fees - Domini Impact International Equity Fund - USD ($)		Investor	Class A		Institutional	Class Y
Maximum sales charge (load) imposed on purchases as a percentage of offering price		none	4.75%		none	none
Maximum sales charge (load) imposed on purchases as a percentage of purchase or redemption		none	none	[1],[2]	none	none
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable)		2.00%	2.00%		2.00%	2.00%
Paper document delivery fee (choose e-delivery to avoid this fee)	[3],[4]	$ 15	$ 15		$ 15	$ 15
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	[5]	$ 10	$ 10		$ 10	$ 10

<b>Annual Fund operating expenses </b><br/> (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Domini Impact International Equity Fund		Investor	Class A	Institutional	Class Y
Management fees		0.88%	0.88%	0.88%	0.88%
Distribution (12b-1) fees		0.25%	0.25%	none	none
Other expenses		0.28%	0.34%	0.14%	0.25%
Total annual Fund operating expenses		1.41%	1.47%	1.02%	1.13%
Fee waiver and expense reimbursements	[1]	none	(0.04%)	none	none
Total annual Fund operating expenses after fee waiver and expense reimbursements		1.41%	1.43%	1.02%	1.13%

<b>Example </b>

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:

<b>Share classes</b><br/>(whether or not shares are redeemed)

Expense Example - Domini Impact International Equity Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	144	446	771	1,691
Class A	614	914	1,236	2,146
Institutional	104	325	563	1,248
Class Y	115	359	622	1,375

<b>Share classes</b><br/>(whether or not shares are redeemed)

Expense Example, No Redemption - Domini Impact International Equity Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	144	446	771	1,691
Class A	614	914	1,236	2,146
Institutional	104	325	563	1,248
Class Y	115	359	622	1,375

<b>Portfolio turnover:</b>

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 turnover rate was 68% of the average value of its portfolio.

<b>Principal investment strategies:</b>

The Fund may invest in equity securities of companies of any capitalization, but under normal circumstances, the Fund primarily invests in mid- and large- capitalization companies located in Europe, the Asia-Pacific region, and throughout the rest of the world. Under normal circumstances, the Fund’s investments will be tied economically to at least 10 different countries other than the U.S and at least 40% of the Fund’s assets will be invested in companies tied economically to countries outside the U.S. 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, preferred shares, equity interests in real estate investment trusts (REITs), and funds that invest primarily in equity securities. The Fund will primarily invest in companies tied economically to developed market countries throughout the world but may invest up to 10% of its assets in securities of issuers tied economically to emerging-market countries. The Fund may have significant exposure to securities of issuers tied economically to Japan, France and the United Kingdom. The Fund also may have significant exposure to securities of issuers in the financial, consumer discretionary, industrial and health care sectors.

While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater corporate accountability. Domini evaluates the Fund’s potential investments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of the issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time. The Fund’s subadviser uses a proprietary quantitative model to select investments to buy and sell from among those which Domini has notified the subadviser are eligible for investment, seeking to build the most attractive portfolio by purchasing the most attractive stocks (as determined by the subadviser’s model) and selling the least attractive stocks (as determined by the subadviser’s model). The Fund also will sell securities that no longer meet Domini’s social and environmental standards.

<b>Principal risks:</b>

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 in alphabetical order.

• Country Risk. The Fund expects to diversify its investments among issuers with significant exposure to various countries throughout the world but it may hold a large number of securities whose issuers have exposure to a single country, including but not limited to Japan, France and the United Kingdom. Significant exposure to a single country would increase the risk that economic, political, and social conditions in that country will have a significant impact on Fund performance.
  
  The Japanese economy is highly dependent upon international trade, particularly with the United States and other Asian countries. In addition, the Japanese economy has been adversely affected by certain structural issues, including an aging population, an unstable financial sector, substantial government deficits, and natural and environmental disasters.
  
  The French economy, including demand for French exports, may be adversely affected by the United Kingdom’s (the “U.K.”) resolution to leave the European Union (“EU”). The French economy also is susceptible to fluctuations in demand for agricultural products. France has experienced several terrorist attacks in the past several years.
  
  The U.K. has one of the largest economies in Europe, and the U.S. and other European countries are substantial trading partners of the U.K. As a result, the U.K.’s economy may be impacted by changes to the economic condition of the U.S. and other European countries. In a referendum held on June 23, 2016, the U.K. resolved to leave the European Union (the “EU”). The referendum may introduce significant uncertainties and instability in the financial markets as the U.K. negotiates its exit from the EU.

• Currency Risk. Fluctuations between the U.S. dollar and foreign currency exchange rates could negatively affect the value of the Fund’s investments. 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 and speculation.

• Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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.

• Market Sector Risk. The Fund may hold a large percentage of securities in a single market sector (e.g., financials). To the extent the 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, regulator or technological change, economic conditions or other developments or risks affecting such market sector 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.

• 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.

• Industrial Sector Risk. Securities in the industrials sector, such as companies engaged in the production, distribution or service of products or equipment for manufacturing, agriculture, forestry, mining and construction, can be significantly affected by general economic trends, including such factors as employment and economic growth, interest rate changes, changes in consumer spending, legislative and governmental regulation and spending, import controls, commodity prices, and worldwide competition.

• 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.

• Foreign Investing and Emerging Markets 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. These risks may be heightened in connection with investments in emerging-market countries.

• Geographic Focus Risk. The Fund will be largely invested in companies based in Europe or the Asia-Pacific region. Market changes or other factors affecting these regions, including political instability and unpredictable economic conditions, could have a significant impact on the Fund due to its regional focus.

• Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards 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.

• Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, sectors, and regions may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards, which may negatively impact Fund performance. This may lead the Fund to avoid investment in certain issuers, industries, markets, sectors, or regions.

• 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.

• Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests.

• 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.

• 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.

• 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.

• Style Risk. The value of your investment may decrease if the subadviser’s quantitative investment approach 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. The subadviser’s quantitative model relies upon a complex software system, and failure of the system to function or the presence of software errors could have an adverse impact on the value of Fund performance.

• 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. 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.

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.

<b>Investment results:</b>

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 Morgan Stanley Capital International Europe, Australasia, and Far East Index (MSCI EAFE), a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the U.S. and Canada. MSCI EAFE (net) is net of withholding taxes on the reinvestment of dividends, but reflects no other deduction for fees, expenses, or taxes. 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 Class A, Institutional, and Class Y shares are those of the Investor shares. Class A shares commenced operations on November 28, 2008. Institutional shares commenced operations on November 30, 2012. Class Y shares were not offered prior to June 15, 2018. These returns have not been adjusted to take into account the lower expenses applicable to Class A, Institutional, and Class Y shares, but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge. Updated information on the Fund’s investment results can be obtained by visiting www.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.

Average Annual Total Return (%)<br/><br/>Calendar years ended December 31

Highest/Lowest quarterly results during this time period were: 27.64% (quarter ended 6/30/09) and –23.40% (quarter ended 12/31/08). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were -3.78%.

<b>Average annual total returns for periods ended December 31, 2017</b><br/>(with maximum sales charge for Class A shares)

Average Annual Total Returns - Domini Impact International Equity Fund	1 Year	5 Years	10 Years
Investor Shares	24.60%	9.71%	2.56%
Investor Shares | Return after taxes on distributions	23.89%	8.80%	1.94%
Investor Shares | Return after taxes on distributions and sale of shares	14.54%	7.64%	2.00%
Class A shares	18.55%	8.66%	2.06%
Institutional Shares	24.78%	10.14%	2.56%
Class Y shares	24.60%	9.71%	2.56%
MSCI EAFE (net of withholding tax) (reflects no deduction for fees, expenses, or taxes except foreign withholding taxes on reinvested dividends)	25.03%	7.90%	1.94%

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).

[1] (under $1 million)

[2] 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.

[3] /year

[4] 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.

[5] /transfer

[1] The Fund's adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Class A share expenses to 1.43%. The agreement expires on November 30, 2019, absent an earlier modification by the Fund's Board.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DOMINI INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 01, 2018
Domini Impact International Equity Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DOMINI IMPACT INTERNATIONAL EQUITY FUND<sup>SM</sup>
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective:</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide its shareholders with long-term total return.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the Fund:</b>
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. 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 each Domini Fund, except the Domini Impact Bond Fund. More information about these and other discounts is available from your financial professional or in the Fund’s prospectus on page 16 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 39 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	<b>Shareholder fees </b> (paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual Fund operating expenses </b><br/> (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, 2019
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover:</b>
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 turnover rate was 68% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	68.00%
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 each Domini Fund, except the Domini Impact Bond Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example </b>
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	<b>Share classes</b><br/>(whether or not shares are redeemed)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Share classes</b><br/>(whether or not shares are redeemed)
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies:</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund may invest in equity securities of companies of any capitalization, but under normal circumstances, the Fund primarily invests in mid- and large- capitalization companies located in Europe, the Asia-Pacific region, and throughout the rest of the world. Under normal circumstances, the Fund’s investments will be tied economically to at least 10 different countries other than the U.S and at least 40% of the Fund’s assets will be invested in companies tied economically to countries outside the U.S. 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, preferred shares, equity interests in real estate investment trusts (REITs), and funds that invest primarily in equity securities. The Fund will primarily invest in companies tied economically to developed market countries throughout the world but may invest up to 10% of its assets in securities of issuers tied economically to emerging-market countries. The Fund may have significant exposure to securities of issuers tied economically to Japan, France and the United Kingdom. The Fund also may have significant exposure to securities of issuers in the financial, consumer discretionary, industrial and health care sectors. While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater corporate accountability. Domini evaluates the Fund’s potential investments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of the issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time. The Fund’s subadviser uses a proprietary quantitative model to select investments to buy and sell from among those which Domini has notified the subadviser are eligible for investment, seeking to build the most attractive portfolio by purchasing the most attractive stocks (as determined by the subadviser’s model) and selling the least attractive stocks (as determined by the subadviser’s model). The Fund also will sell securities that no longer meet Domini’s social and environmental standards.
Risk [Heading]	rr_RiskHeading	<b>Principal risks:</b>
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 in alphabetical order. Country Risk. The Fund expects to diversify its investments among issuers with significant exposure to various countries throughout the world but it may hold a large number of securities whose issuers have exposure to a single country, including but not limited to Japan, France and the United Kingdom. Significant exposure to a single country would increase the risk that economic, political, and social conditions in that country will have a significant impact on Fund performance. The Japanese economy is highly dependent upon international trade, particularly with the United States and other Asian countries. In addition, the Japanese economy has been adversely affected by certain structural issues, including an aging population, an unstable financial sector, substantial government deficits, and natural and environmental disasters. The French economy, including demand for French exports, may be adversely affected by the United Kingdom’s (the “U.K.”) resolution to leave the European Union (“EU”). The French economy also is susceptible to fluctuations in demand for agricultural products. France has experienced several terrorist attacks in the past several years. The U.K. has one of the largest economies in Europe, and the U.S. and other European countries are substantial trading partners of the U.K. As a result, the U.K.’s economy may be impacted by changes to the economic condition of the U.S. and other European countries. In a referendum held on June 23, 2016, the U.K. resolved to leave the European Union (the “EU”). The referendum may introduce significant uncertainties and instability in the financial markets as the U.K. negotiates its exit from the EU. Currency Risk. Fluctuations between the U.S. dollar and foreign currency exchange rates could negatively affect the value of the Fund’s investments. 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 and speculation. Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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. Market Sector Risk. The Fund may hold a large percentage of securities in a single market sector (e.g., financials). To the extent the 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, regulator or technological change, economic conditions or other developments or risks affecting such market sector 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. 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. Industrial Sector Risk. Securities in the industrials sector, such as companies engaged in the production, distribution or service of products or equipment for manufacturing, agriculture, forestry, mining and construction, can be significantly affected by general economic trends, including such factors as employment and economic growth, interest rate changes, changes in consumer spending, legislative and governmental regulation and spending, import controls, commodity prices, and worldwide competition. 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. Foreign Investing and Emerging Markets 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. These risks may be heightened in connection with investments in emerging-market countries. Geographic Focus Risk. The Fund will be largely invested in companies based in Europe or the Asia-Pacific region. Market changes or other factors affecting these regions, including political instability and unpredictable economic conditions, could have a significant impact on the Fund due to its regional focus. Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards 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. Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, sectors, and regions may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards, which may negatively impact Fund performance. This may lead the Fund to avoid investment in certain issuers, industries, markets, sectors, or regions. 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. Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests. 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. 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. 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. Style Risk. The value of your investment may decrease if the subadviser’s quantitative investment approach 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. The subadviser’s quantitative model relies upon a complex software system, and failure of the system to function or the presence of software errors could have an adverse impact on the value of Fund performance. 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. 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. 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	<b>Investment results:</b>
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 Morgan Stanley Capital International Europe, Australasia, and Far East Index (MSCI EAFE), a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the U.S. and Canada. MSCI EAFE (net) is net of withholding taxes on the reinvestment of dividends, but reflects no other deduction for fees, expenses, or taxes. 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 Class A, Institutional, and Class Y shares are those of the Investor shares. Class A shares commenced operations on November 28, 2008. Institutional shares commenced operations on November 30, 2012. Class Y shares were not offered prior to June 15, 2018. These returns have not been adjusted to take into account the lower expenses applicable to Class A, Institutional, and Class Y shares, but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge. Updated information on the Fund’s investment results can be obtained by visiting www.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 Morgan Stanley Capital International Europe, Australasia, and Far East Index (MSCI EAFE), a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the U.S. and Canada.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-582-6757
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.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 (%)<br/><br/>Calendar years ended December 31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest/Lowest quarterly results during this time period were: 27.64% (quarter ended 6/30/09) and –23.40% (quarter ended 12/31/08). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were -3.78%.
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns for periods ended December 31, 2017</b><br/>(with maximum sales charge for Class A shares)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	but for Class A shares, the returns in the table reflect a deduction for the maximum sales charge.
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 International 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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.88%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.28%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.41%
Fee waiver and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	1.41%
1 Year	rr_ExpenseExampleYear01	$ 144
3 Years	rr_ExpenseExampleYear03	446
5 Years	rr_ExpenseExampleYear05	771
10 Years	rr_ExpenseExampleYear10	1,691
1 Year	rr_ExpenseExampleNoRedemptionYear01	144
3 Years	rr_ExpenseExampleNoRedemptionYear03	446
5 Years	rr_ExpenseExampleNoRedemptionYear05	771
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,691
2008	rr_AnnualReturn2008	(46.65%)
2009	rr_AnnualReturn2009	28.68%
2010	rr_AnnualReturn2010	11.25%
2011	rr_AnnualReturn2011	(13.45%)
2012	rr_AnnualReturn2012	22.53%
2013	rr_AnnualReturn2013	25.77%
2014	rr_AnnualReturn2014	(3.27%)
2015	rr_AnnualReturn2015	1.76%
2016	rr_AnnualReturn2016	3.05%
2017	rr_AnnualReturn2017	24.60%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(3.78%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	27.64%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.40%)
1 Year	rr_AverageAnnualReturnYear01	24.60%
5 Years	rr_AverageAnnualReturnYear05	9.71%
10 Years	rr_AverageAnnualReturnYear10	2.56%
Domini Impact International 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	[5],[6]
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.88%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.34%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.47%
Fee waiver and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	1.43%
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	$ 614
3 Years	rr_ExpenseExampleYear03	914
5 Years	rr_ExpenseExampleYear05	1,236
10 Years	rr_ExpenseExampleYear10	2,146
1 Year	rr_ExpenseExampleNoRedemptionYear01	614
3 Years	rr_ExpenseExampleNoRedemptionYear03	914
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,236
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,146
1 Year	rr_AverageAnnualReturnYear01	18.55%
5 Years	rr_AverageAnnualReturnYear05	8.66%
10 Years	rr_AverageAnnualReturnYear10	2.06%
Domini Impact International 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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.88%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.02%
Fee waiver and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	1.02%
1 Year	rr_ExpenseExampleYear01	$ 104
3 Years	rr_ExpenseExampleYear03	325
5 Years	rr_ExpenseExampleYear05	563
10 Years	rr_ExpenseExampleYear10	1,248
1 Year	rr_ExpenseExampleNoRedemptionYear01	104
3 Years	rr_ExpenseExampleNoRedemptionYear03	325
5 Years	rr_ExpenseExampleNoRedemptionYear05	563
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,248
1 Year	rr_AverageAnnualReturnYear01	24.78%
5 Years	rr_AverageAnnualReturnYear05	10.14%
10 Years	rr_AverageAnnualReturnYear10	2.56%
Domini Impact International 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
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
Management fees	rr_ManagementFeesOverAssets	0.88%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.25%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.13%
Fee waiver and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	1.13%
1 Year	rr_ExpenseExampleYear01	$ 115
3 Years	rr_ExpenseExampleYear03	359
5 Years	rr_ExpenseExampleYear05	622
10 Years	rr_ExpenseExampleYear10	1,375
1 Year	rr_ExpenseExampleNoRedemptionYear01	115
3 Years	rr_ExpenseExampleNoRedemptionYear03	359
5 Years	rr_ExpenseExampleNoRedemptionYear05	622
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,375
1 Year	rr_AverageAnnualReturnYear01	24.60%
5 Years	rr_AverageAnnualReturnYear05	9.71%
10 Years	rr_AverageAnnualReturnYear10	2.56%
Domini Impact International Equity Fund | Return after taxes on distributions | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	23.89%
5 Years	rr_AverageAnnualReturnYear05	8.80%
10 Years	rr_AverageAnnualReturnYear10	1.94%
Domini Impact International Equity Fund | Return after taxes on distributions and sale of shares | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.54%
5 Years	rr_AverageAnnualReturnYear05	7.64%
10 Years	rr_AverageAnnualReturnYear10	2.00%
Domini Impact International Equity Fund | MSCI EAFE (net of withholding tax) (reflects no deduction for fees, expenses, or taxes except foreign withholding taxes on reinvested dividends)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	25.03%
5 Years	rr_AverageAnnualReturnYear05	7.90%
10 Years	rr_AverageAnnualReturnYear10	1.94%

[1] /year

[2] 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.

[3] /transfer

[4] The Fund's adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Class A share expenses to 1.43%. The agreement expires on November 30, 2019, absent an earlier modification by the Fund's Board.

[5] (under $1 million)

[6] 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.

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Domini Impact Bond Fund

DOMINI IMPACT BOND FUND^SM

<b>Investment objective: </b>

The Fund seeks to provide its shareholders with a high level of current income and total return.

<b>Fees and expenses of the Fund: </b>

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.

<b>Shareholder fees </b> (paid directly from your investment)

Shareholder Fees - Domini Impact Bond Fund - USD ($)		Investor	Institutional	Class Y
Redemption fee on shares held less than 30 days (as a percentage of amount redeemed, if applicable)		2.00%	2.00%	2.00%
Paper document delivery fee (choose e-delivery to avoid this fee)	[1],[2]	$ 15	$ 15	$ 15
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	[3]	$ 10	$ 10	$ 10

<b>Annual Fund operating expenses </b> <br/>(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Domini Impact Bond Fund		Investor	Institutional	Class Y
Management fees		0.32%	0.32%	0.32%
Distribution (12b-1) fees		0.25%	none	none
Administrative services fee		0.25%	0.25%	0.25%
Other miscellaneous expenses		0.32%	0.46%	0.28%
Total other expenses		0.57%	0.71%	0.53%
Total annual Fund operating expenses		1.14%	1.03%	0.85%
Fee waivers and expense reimbursements	[1]	(0.27%)	(0.46%)	(0.20%)
Total annual Fund operating expenses after fee waiver and expense reimbursements		0.87%	0.57%	0.65%

<b>Example </b>

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:

<b>Share classes </b><br/>(whether or not shares are redeemed)

Expense Example - Domini Impact Bond Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	89	335	602	1,362
Institutional	58	282	524	1,218
Class Y	66	251	452	1,030

<b>Share classes </b><br/>(whether or not shares are redeemed)

Expense Example, No Redemption - Domini Impact Bond Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Investor	89	335	602	1,362
Institutional	58	282	524	1,218
Class Y	66	251	452	1,030

<b>Portfolio turnover: </b>

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 326% of the average value of its portfolio.

<b>Principal investment strategies: </b>

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 default and illiquid securities. The Fund’s investments may change significantly from time to time based on current market conditions and investment eligibility determinations.

While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater issuer accountability. Domini evaluates the Fund’s potential corporate debt instruments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of an issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. For noncorporate issuers, including government-sponsored entities, Domini seeks to identify investments that generate positive social, environmental or community impact, especially on underserved communities. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time. The Fund’s subadviser uses proprietary fundamental research to select investments to buy and sell from among those which Domini 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 no longer meet Domini’s social and environmental standards.

<b>Principal risks:</b>

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 in alphabetical order.

• 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.

• Currency Risk. Fluctuations between the U.S. dollar and foreign currency exchange rates could negatively affect the value of the Fund’s investments. 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 and speculation.

• Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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.

• 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.

• 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.

• 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.

• Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards will affect the Fund’s exposure to certain issuers, industries, and sectors and may impact the relative financial performance of the Fund — positively or negatively — depending on whether such investments are in or out of favor.

• Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, and sectors, may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards which may negatively impact Fund performance. This may also lead the Fund to avoid investment in certain issuers, industries, markets, or sectors.

• 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. Recent U.S. interest rates have been historically low but have begun to rise, so the Fund faces a heightened risk that interest rates may continue to rise. 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.

• 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.

• Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests.

• 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 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.

• 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.

• Mortgage-related and asset-backed securities risk. The value of mortgage-related and asset-backed securities will be influenced by factors affecting the housing 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 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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. 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.

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.

<b>Investment results:</b>

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 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 www.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.

Average Annual Total Return (%)<br/><br/>Calendar years ended December 31

Highest/lowest quarterly results during this time period were: 4.49% (quarter ended 12/31/08) and –3.21% (quarter ended 12/31/16). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were -1.70%.

<b>Average annual total returns for periods ended December 31, 2017</b>

Average Annual Total Returns - Domini Impact Bond Fund	1 Year	5 Years	10 Years
Investor shares	3.85%	1.69%	3.28%
Investor shares | Return after taxes on distributions	2.86%	0.82%	2.24%
Investor shares | Return after taxes on distributions and sale of shares	2.18%	0.91%	2.18%
Institutional shares	4.16%	1.92%	3.28%
Class Y shares	3.85%	1.69%	3.28%
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expense, or taxes)	3.54%	2.10%	4.01%

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).

[1] /year

[2] 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.

[3] /transfer

[1] 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. The Investor, Institutional and Class Y share agreements expire on November 30, 2019, absent an earlier modification by the Fund's Board.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DOMINI INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 01, 2018
Domini Impact Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DOMINI IMPACT BOND FUND<sup>SM</sup>
Objective [Heading]	rr_ObjectiveHeading	<b>Investment objective: </b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide its shareholders with a high level of current income and total return.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses of the Fund: </b>
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	<b>Shareholder fees </b> (paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual Fund operating expenses </b> <br/>(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, 2019
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover: </b>
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 326% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	326.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example </b>
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	<b>Share classes </b><br/>(whether or not shares are redeemed)
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>Share classes </b><br/>(whether or not shares are redeemed)
Strategy [Heading]	rr_StrategyHeading	<b>Principal investment strategies: </b>
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 default and illiquid securities. The Fund’s investments may change significantly from time to time based on current market conditions and investment eligibility determinations. While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring social and environmental sustainability standards into their investment decisions, investors can encourage greater issuer accountability. Domini evaluates the Fund’s potential corporate debt instruments against its social and environmental standards based on the businesses in which an issuer engages, as well as on the quality of an issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. For noncorporate issuers, including government-sponsored entities, Domini seeks to identify investments that generate positive social, environmental or community impact, especially on underserved communities. Domini’s interpretation and application of its social and environmental standards are subjective and may evolve over time. The Fund’s subadviser uses proprietary fundamental research to select investments to buy and sell from among those which Domini 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 no longer meet Domini’s social and environmental standards.
Risk [Heading]	rr_RiskHeading	<b>Principal risks:</b>
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 in alphabetical order. 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. Currency Risk. Fluctuations between the U.S. dollar and foreign currency exchange rates could negatively affect the value of the Fund’s investments. 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 and speculation. Cybersecurity Risk. Cybersecurity failures or breaches by the Fund’s adviser, transfer agent, distributor, custodian, fund accounting agent and 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. 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. 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. 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. Impact Investing Risk. The application of the adviser’s social and environmental standards and the timing of the subadviser’s implementation of such standards will affect the Fund’s exposure to certain issuers, industries, and sectors and may impact the relative financial performance of the Fund — positively or negatively — depending on whether such investments are in or out of favor. Information Risk. There is a risk that information used by the adviser to evaluate the social and environmental performance of issuers, industries, markets, and sectors, may not be readily available, complete, or accurate, which could negatively impact the adviser’s ability to apply its social and environmental standards which may negatively impact Fund performance. This may also lead the Fund to avoid investment in certain issuers, industries, markets, or sectors. 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. Recent U.S. interest rates have been historically low but have begun to rise, so the Fund faces a heightened risk that interest rates may continue to rise. 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. 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. Market Risk. The market prices of Fund securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets or adverse investor sentiment. If the market prices of the securities owned by the Fund fall, the value of your investment will decline. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These conditions may continue, recur, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; changes in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. U.S. and non-U.S. governments and central banks have provided significant support to financial markets, including by keeping interest rates at historically low levels. The U.S. Federal Reserve is reducing its market support activities and has begun raising interest rates. Certain foreign governments and central banks have implemented or may implement so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, could negatively affect financial markets generally, increase market volatility and reduce the value and liquidity of securities in which the Fund invests. 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 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. 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. Mortgage-related and asset-backed securities risk. The value of mortgage-related and asset-backed securities will be influenced by factors affecting the housing 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 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. 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. 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. 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. 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. 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. 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. 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. 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. 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	<b>Investment results:</b>
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 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 www.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 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	www.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 (%)<br/><br/>Calendar years ended December 31
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest/lowest quarterly results during this time period were: 4.49% (quarter ended 12/31/08) and –3.21% (quarter ended 12/31/16). The Fund’s year-to-date results as of the most recent calendar quarter ended 09/30/2018 were -1.70%.
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns for periods ended December 31, 2017</b>
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
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	0.32%
Total other expenses	rr_OtherExpensesOverAssets	0.57%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.14%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.27%)	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	0.87%
1 Year	rr_ExpenseExampleYear01	$ 89
3 Years	rr_ExpenseExampleYear03	335
5 Years	rr_ExpenseExampleYear05	602
10 Years	rr_ExpenseExampleYear10	1,362
1 Year	rr_ExpenseExampleNoRedemptionYear01	89
3 Years	rr_ExpenseExampleNoRedemptionYear03	335
5 Years	rr_ExpenseExampleNoRedemptionYear05	602
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,362
2008	rr_AnnualReturn2008	5.69%
2009	rr_AnnualReturn2009	5.77%
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%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(1.70%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2008
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	4.49%
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	3.85%
5 Years	rr_AverageAnnualReturnYear05	1.69%
10 Years	rr_AverageAnnualReturnYear10	3.28%
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
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	0.46%
Total other expenses	rr_OtherExpensesOverAssets	0.71%
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.03%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.46%)	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	0.57%
1 Year	rr_ExpenseExampleYear01	$ 58
3 Years	rr_ExpenseExampleYear03	282
5 Years	rr_ExpenseExampleYear05	524
10 Years	rr_ExpenseExampleYear10	1,218
1 Year	rr_ExpenseExampleNoRedemptionYear01	58
3 Years	rr_ExpenseExampleNoRedemptionYear03	282
5 Years	rr_ExpenseExampleNoRedemptionYear05	524
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,218
1 Year	rr_AverageAnnualReturnYear01	4.16%
5 Years	rr_AverageAnnualReturnYear05	1.92%
10 Years	rr_AverageAnnualReturnYear10	3.28%
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],[2]
Outgoing bank wire transfer fee (deducted directly from sale proceeds)	rr_ShareholderFeeOther	$ 10	[3]
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	0.28%
Total other expenses	rr_OtherExpensesOverAssets	0.53%
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.85%
Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)	[4]
Total annual Fund operating expenses after fee waiver and expense reimbursements	rr_NetExpensesOverAssets	0.65%
1 Year	rr_ExpenseExampleYear01	$ 66
3 Years	rr_ExpenseExampleYear03	251
5 Years	rr_ExpenseExampleYear05	452
10 Years	rr_ExpenseExampleYear10	1,030
1 Year	rr_ExpenseExampleNoRedemptionYear01	66
3 Years	rr_ExpenseExampleNoRedemptionYear03	251
5 Years	rr_ExpenseExampleNoRedemptionYear05	452
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,030
1 Year	rr_AverageAnnualReturnYear01	3.85%
5 Years	rr_AverageAnnualReturnYear05	1.69%
10 Years	rr_AverageAnnualReturnYear10	3.28%
Domini Impact Bond Fund | Return after taxes on distributions | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.86%
5 Years	rr_AverageAnnualReturnYear05	0.82%
10 Years	rr_AverageAnnualReturnYear10	2.24%
Domini Impact Bond Fund | Return after taxes on distributions and sale of shares | Investor
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.18%
5 Years	rr_AverageAnnualReturnYear05	0.91%
10 Years	rr_AverageAnnualReturnYear10	2.18%
Domini Impact Bond Fund | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expense, or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.54%
5 Years	rr_AverageAnnualReturnYear05	2.10%
10 Years	rr_AverageAnnualReturnYear10	4.01%

[1] /year

[2] 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.

[3] /transfer

[4] 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. The Investor, Institutional and Class Y share agreements expire on November 30, 2019, absent an earlier modification by the Fund's Board.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DOMINI INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 01, 2018
Document Creation Date	dei_DocumentCreationDate	Nov. 27, 2018