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Parnassus International Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Parnassus International Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Parnassus International Equity Fund’s objective is to achieve capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Parnassus International Equity Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (%)(expenses that you pay each year as a percentageof the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Parnassus International Equity Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. The Fund is newly organized and, as of the date of this Prospectus, has not had any portfolio turnover.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” are estimated for the current fiscal year. Actual expenses may differ from estimates.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Parnassus International Equity Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, and that the Fund’s expenses are equal to the total annual fund operating expenses after expense reimbursement for the first year and the total annual fund operating expenses for the remaining years. Although your actual costs may be higher or lower, under these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Parnassus International Equity Fund’s objective is to achieve capital appreciation by investing primarily in a diversified portfolio of equity securities of non‑U.S. companies. Equity securities include common stock, preferred stock, American Depositary Receipts (“ADRs”), American Depositary Shares (“ADSs”), convertible preferred stock, and warrants. Under normal circumstances, the Fund will invest a minimum of 80% of its net assets (plus borrowings for investment purposes) in equity securities of non‑U.S. companies. Sometimes these “non-U.S. companies” (as defined below) are traded in the U.S. on a national securities exchange, or are ADRs or ADSs. The Fund invests primarily in common stocks of companies in developed countries, but may invest up to 15% of its total assets in companies in emerging (less developed) markets. The Fund does not target a specific number of countries or allocation percentages across regions, and from time to time, the Fund may have significant positions in particular countries or regions.
The Fund’s investment adviser, Parnassus Investments, LLC, (“Parnassus” or the “Adviser”) determines a company’s country, and therefore whether it is a “non- U.S. company,” by referring to: the stock exchange where its securities are principally traded; where it is registered, organized or incorporated; where its headquarters are located; its MSCI country classification; where it derives at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed; or where at
least 50% of its assets are located. These categories are designed to identify investments that are tied economically to, and subject to the risks of, investing outside the U.S. The Adviser considers a country to be an emerging market if the country is included in the MSCI Emerging Markets Index.
When investing the Fund’s assets, the Adviser follows a “core strategy,” which selects value stocks and growth stocks of companies for investment. Value stocks are stocks of companies that the Fund’s investment adviser believes are undervalued, which means that their current prices are less than the adviser believes they are worth. Growth stocks are stocks of companies whose revenues, earnings, or cash flows the Adviser expects to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase in stock price.
The Fund is primarily a large‑cap fund, which means that it normally invests more than half of its net assets in large, well-established companies. The Fund may invest to a lesser extent in small- and mid‑capitalization companies.
The portfolio manager focuses on seeking downside protection by purchasing investments for the Fund’s portfolio that the Adviser believes have less exposure to broad equity market risk taking into consideration the research and analysis performed on individual companies, the universe of holdings within the Fund’s portfolio, and the Adviser’s assessment of the market and applicable risks.
The Fund seeks to invest in equity securities that have the potential for capital appreciation by investing in companies that are financially sound and have good prospects for the future. To determine a company’s prospects, the Adviser reviews the company’s income statement, cash flow statement and balance sheet, and analyzes the company’s durable competitive advantages and management team. The Adviser assesses a company’s durable competitive advantages to determine how likely it is to ward off rivals for an extended time by looking for characteristics such as a high level of return on invested capital, a strong network effect (meaning there is a loyal base of customers or partners for whom cross-selling products can enhance the client experience), patents and regulatory licenses, high customer switching costs, an effective well-known brand, and/or low production costs relative to competitors.
As part of the Adviser’s investment approach, the Adviser seeks to invest in companies with sustainable business practices, in alignment with its investment philosophy set out herein and in its Principles and Sustainable Investment Policy (as discussed in further detail below), as the Adviser believes these factors are relevant to its assessment of quality and the risk-return profiles of companies in the Fund. As discussed further under the captions, “Sustainable Investment Guidelines” and “Integration and Stewardship,” the Principles and Sustainable Investment Policy describe the Adviser’s approach to investing. This quality assessment is integrated as part of a holistic evaluation of fundamental attributes of the company across the Parnassus quality characteristics of competitive advantages, relevancy, management, sustainable business practices and valuation. The Adviser evaluates sustainable business factors primarily based on sector relevance and business conduct. As governance standards and market practices may differ considerably across international markets and regions, Parnassus applies context-specific evaluations for non‑U.S. equity securities. Examples of factors the Adviser may consider in evaluating companies include but are not limited to: climate-related risk, product safety and quality, human capital management, environmental impacts of operations and products, community and stakeholder impacts, supply chain practices and corporate governance. The Adviser conducts a holistic evaluation for each company, and not all factors will necessarily be relevant to all companies.
The sustainable business practices for all current holdings are reviewed at least annually to ensure the companies in the Fund continue to be consistent with the Adviser’s investment philosophy and expectations. The Adviser will evaluate on a case-by-case basis whether the Fund will continue to hold or sell a security if the Adviser believes a company’s fundamentals will deteriorate, if it believes a company’s stock has little potential for appreciation relative to other available opportunities, or if the company no longer meets the Adviser’s expectations for sustainable business practices and the Adviser does not believe it is an appropriate investment for the Fund following such changes. The Adviser does not generally expect to invest in companies that operate contrary to its Principles and Sustainable Investment Policy and investment philosophy as described in this prospectus.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
When the Parnassus International Equity Fund has been in operation for a full calendar year, performance
information will be shown in this Prospectus and will give some indication of the risks of investing in the Fund by comparing the Fund’s performance with a broad measure of market performance. How the Fund performed in the past (before and after taxes) is not necessarily an indication of how it will perform in the future. Updated performance information is available on the Fund’s website, www.parnassus.com, or by calling toll-free at (800) 999‑3505.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess When the Parnassus International Equity Fund has been in operation for a full calendar year, performanceinformation will be shown in this Prospectus and will give some indication of the risks of investing in the Fund by comparing the Fund’s performance with a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 999‑3505
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.parnassus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture How the Fund performed in the past (before and after taxes) is not necessarily an indication of how it will perform in the future.
Parnassus International Equity Fund | Risk Lose Money [Member]  
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Risk [Text Block] rr_RiskTextBlock You could lose money investing in the Fund.
Parnassus International Equity Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investments in the Fund are not deposits, endorsements or guarantees of any bank and are not insured by the Federal Deposit Insurance Corporation or any other government agency.
Parnassus International Equity Fund | Stock Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Stock Market Risk. The Fund invests in common stocks, whose prices fluctuate in response to the fortunes of individual companies and in response to general market and economic conditions both in the U.S. and abroad. In the past decade, financial markets throughout the world have experienced increased volatility, decreased liquidity and heightened uncertainty, including risks associated with rising inflation, trade tensions, ongoing armed conflicts, such as between Ukraine and Russia in Europe and among Israel, Hamas, and other militant groups in the Middle East or elsewhere, and the impact of epidemic and pandemic diseases. Additionally, risks associated with volatility and disruptions in the banking sector (including bank failures), interest rate increases, political events, rising government debt in the U.S. and the possibility of a national or global recession could affect the economies of many nations, including the United States, in ways that cannot be foreseen at the present time, and may adversely impact the markets in which the Fund invests. The Fund’s holdings can vary significantly from broad stock market indices.
Parnassus International Equity Fund | Equity Securities Risk [Member]  
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Risk [Text Block] rr_RiskTextBlock
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Equity Securities Risk. The Fund may invest in equity securities including common stocks, which include the common stock of any class or series of domestic or foreign corporations or any similar equity interest, such as a trust or partnership interest. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or facts relating to specific companies in which the Fund invests. These investments may or may not pay dividends and may or may not carry voting rights. Common stock occupies the most junior position in a company’s capital structure.
Parnassus International Equity Fund | Foreign Non US Securities Risk [Member]  
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Risk [Text Block] rr_RiskTextBlock
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Foreign (Non‑U.S.) Securities Risk. The Fund invests primarily in foreign securities. Foreign markets can be more volatile and less liquid than the U.S. market due to increased risks of adverse issuer, political, regulatory, market or economic developments and can perform differently from the U.S. market. Policy, economic and legislative changes in foreign countries and the U.S., and other events affecting global markets, such as international conflicts and wars, epidemic and pandemic diseases and the imposition of sanctions, tariffs or other governmental restrictions may contribute to decreased liquidity and increased volatility in the financial markets. There may be less information publicly available about non‑U.S. issuers and their securities, and those issuers may be subject to lower levels of government regulation and oversight. Further, foreign companies may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies. Substantial withholding or other taxes may also apply to distributions from foreign companies and/or on gains realized from the sale of stock in foreign companies. Currency exchange rate fluctuations may negatively affect investments denominated in foreign currencies and any income received or expenses paid by the Fund in a foreign currency. The Fund generally will not hedge its perceived foreign currency exposure back into the U.S. dollar and therefore the Fund is considered to be currency unhedged.
Parnassus International Equity Fund | Emerging Markets Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Emerging Markets Risk. Investing in emerging market securities imposes risks different from, or greater than, risks of investing in U.S. securities or in developed countries outside the U.S. These risks include: smaller market capitalization of securities markets, which may suffer periods of relative illiquidity; significant price volatility; restrictions on foreign investment; and possible repatriation of investment income and capital. In addition, foreign investors may be required to register the proceeds of sales and future economic or political crises could lead to price controls, forced mergers, expropriation or confiscatory taxation, seizure, nationalization or the creation of government monopolies. Inflation and rapid fluctuations in inflation rates have had, and may continue to have, negative effects on the economies and securities markets of certain emerging market countries.
Parnassus International Equity Fund | Large Capitalization Company Risk [Member]  
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Risk [Text Block] rr_RiskTextBlock
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Large-Capitalization Company Risk. Large- capitalization companies may be unable to respond quickly to new competitive challenges and also may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.
Parnassus International Equity Fund | Small and Mid Capitalization Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Small‑ and Mid‑Capitalization Company Risk. In addition to large-capitalization companies, the Fund may invest in small‑ and/or mid‑capitalization companies, which can be particularly sensitive to changing economic conditions since they do not have the financial resources or the well-established businesses of large-capitalization companies. Relative to the stocks of large-capitalization companies, the stocks of small- and mid‑capitalization companies are often thinly traded, and purchases and sales may result in higher transaction costs. Also, small-capitalization companies tend to perform poorly during times of economic stress.
Parnassus International Equity Fund | Management Risk [Member]  
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Risk [Text Block] rr_RiskTextBlock
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Management Risk. The investment process used by the Adviser to select securities for the Fund’s investment portfolio may not prove effective, and the Adviser’s judgments about the attractiveness, value and potential appreciation of the Fund’s investments may prove to be incorrect in that the investments chosen by the Adviser may not perform as anticipated. Certain risks are inherent in the ownership of any security, and there is no assurance that the Fund’s investment objective will be achieved.
Parnassus International Equity Fund | Sustainable Business Practice Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Sustainable Business Practice Risk. Sustainable business risk refers to the risk stemming from investing in companies with sustainable business practices. The Fund seeks to invest in quality companies with sustainable business practices and to avoid investments in companies that do not meet its quality expectations. The Adviser evaluates sustainable business factors primarily based on sector relevance and business conduct. Examples of factors the Adviser may consider in evaluating companies include but are not limited to: climate-related risk, product safety and quality, human capital management, environmental impacts of operations and products, community and stakeholder impacts, supply chain practices and corporate governance. This may affect the Fund’s exposure to certain companies or industries and cause the Fund to forego certain investment opportunities.
Parnassus International Equity Fund | American Depositary Receipts ADR Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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American Depositary Receipts (ADR) Risk. ADRs are receipts, issued by depository banks in the United States, for shares of a foreign-based company that entitle the holder to dividends and capital gains on the underlying security. ADRs may be sponsored or unsponsored. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depositary’s transaction fees. Under an unsponsored ADR arrangement, the foreign issuer assumes no obligations and the depositary’s transaction fees are paid directly by the ADR holders. In addition to the risks of investing in foreign securities, there is no guarantee that an ADR issuer will continue to offer a particular ADR. As a result, the Fund may have difficulty selling the ADR or selling them quickly and efficiently at the prices at which they have been valued. The issuers of unsponsored ADRs are not obligated to disclose information that is considered material in the U.S. and voting rights with respect to the deposited securities are not passed through. ADRs may not track the prices of the underlying foreign securities on which they are based, and their values may change materially at times when U.S. markets are not open for trading.
Parnassus International Equity Fund | New Fund Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
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New Fund Risk. The Fund is a recently organized management investment company with a limited operating history. As a result, prospective investors have a limited track record on which to base their investment decision. In addition, there can be no assurance that the Fund will grow to, or maintain, an economically viable size, in which case the Board of Trustees may determine to liquidate the Fund.
Parnassus International Equity Fund | Tax Law Change Risk [Member]  
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Tax Law Change Risk: Tax law is subject to change, possibly with retroactive effect, or to different interpretations. For example, Congress continues to consider substantial changes to U.S. federal income tax laws, and some with retroactive effect, that could result in substantial adverse U.S. federal income tax consequences to the Fund and its shareholders. Any future changes are highly uncertain, and the impact on the Fund or its shareholders cannot be predicted. Prospective shareholders should consult their own tax advisors regarding the impact to them of possible changes in tax laws.
Parnassus International Equity Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.20%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.25%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [2]
1 Year rr_ExpenseExampleYear01 $ 97
3 Years rr_ExpenseExampleYear03 $ 356
Parnassus International Equity Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.29%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.70% [2]
1 Year rr_ExpenseExampleYear01 $ 72
3 Years rr_ExpenseExampleYear03 $ 286
[1] “Other Expenses” are estimated for the current fiscal year. Actual expenses may differ from estimates.
[2] The investment adviser has contractually agreed to limit total annual fund operating expenses to 0.95% of net assets for the Parnassus International Equity Fund—Investor Shares and to 0.70% of net assets for the Parnassus International Equity Fund— Institutional Shares. This agreement will not be terminated prior to May 1, 2026, and may be continued indefinitely by the investment adviser on a year-to-year basis.