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PARNASSUS FUNDS | Parnassus Growth Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Parnassus Growth Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Parnassus Growth Equity Fund has the overall investment objective of 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 Growth 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 percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2024
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Parnassus Growth 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 Growth 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 operating 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 Growth Equity Fund normally invests at least 80% of its net assets (plus borrowings for investment purposes) in equity securities of large-sized growth companies. Equity securities include common stocks, depositary receipts, and interests in real estate investment trusts. The Fund considers a large-sized company to be one that has a market capitalization that is greater than the median market capitalization of the Russell 1000® Growth Index (which was $16 billion as of May 31, 2022) measured at the time of purchase. The Fund will not automatically sell or cease to purchase stock of a company it already owns just because the company’s market capitalization grows or falls outside the ranges of the Russell 1000® Growth Index, which are subject to change. The Fund may normally invest up to 20% of its net assets in small-and mid-capitalization companies. A growth company is a company that the Adviser believes has a superior and pragmatic growth strategy and the potential for above-average revenue and earnings growth. The Fund invests mainly in domestic stocks of companies that are financially sound and have good prospects for the future, and to a lesser extent may also invest in foreign
securities of similar companies. The Fund may purchase foreign securities directly on foreign markets. The Fund applies a fossil-fuel free investment strategy, meaning that it does not invest in companies that derive significant revenues from the extraction, exploration, production or refining of fossil fuels. Pursuant to the strategy, the Fund may invest in companies that use fossil fuel-based energy to power their operations or for other purposes. The Fund defines “significant revenues” as being 10% or greater. To determine a company’s prospects, the Fund’s investment adviser, Parnassus Investments, LLC (the “Adviser”), reviews the company’s income statement, cash flow statement and balance sheet, and analyzes the company’s sustainable strategic advantage and management team. The Adviser also takes environmental, social and governance (“ESG”) factors into account in making investment decisions, as discussed in more detail in the prospectus. The Fund will 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 or if the company no longer meets the Adviser’s ESG expectations.
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 Growth 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 Growth 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.
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 FUNDS | Parnassus Growth Equity Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money investing in the Fund.
PARNASSUS FUNDS | Parnassus Growth 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 FUNDS | Parnassus Growth 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. Risks associated with rising inflation, trade tensions, the war between Russia and Ukraine, the United Kingdom’s departure from the European Union (“Brexit”), and the impact of epidemic and pandemic diseases, such as COVID‑19. 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 FUNDS | Parnassus Growth Equity Fund | Equity Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
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 FUNDS | Parnassus Growth Equity Fund | Growth Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Growth Investing Risk. The Adviser may be wrong in its assessment of a company’s potential for growth and the growth stocks the Fund holds may not grow as the Adviser anticipates. Finally, there are periods when investing in growth stocks falls out of favor with investors and these stocks may underperform.
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Large Capitalization Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
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 FUNDS | Parnassus Growth Equity Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
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 FUNDS | Parnassus Growth Equity Fund | Environmental Social and Governance ESG Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Environmental, Social, and Governance (ESG) Investing Risk. ESG investing risk is the risk stemming from the environmental, social, and governance factors that the Fund applies in selecting securities. The Fund intends to screen out companies that do not meet its ESG expectations. This may affect the Fund’s exposure to certain companies or industries and cause the Fund to forego certain investment opportunities. The Fund’s returns may be lower than other funds that do not seek to invest in companies based on ESG screens.
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Fossil Fuel Free Investing Considerations Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Fossil-Fuel Free Investing Considerations Risk: Pursuing a fossil-fuel free investment strategy may limit the number of investment opportunities available to the Fund, and as a result, at times, the Fund may underperform funds that are not subject to similar investment considerations. For example, the Fund may exclude fossil-fuel related investments when other considerations would suggest that investing in such securities would be advantageous. The Fund may also underperform funds that invest in the energy and utilities sectors, particularly in times of rising oil, gas and energy prices.
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Foreign Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Foreign Securities Risk. The Fund may invest up to 20% of its assets 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 and legislative changes in foreign countries and other events affecting global markets, such as international conflicts and wars, COVID-19 and Brexit, may contribute to decreased liquidity and increased volatility in the financial markets. 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 taxes may also apply to distributions from foreign companies.
PARNASSUS FUNDS | Parnassus Growth 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 FUNDS | Parnassus Growth Equity Fund | Real Estate Investment Trust REIT Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Real Estate Investment Trust (REIT) Risk. Investing in REITs involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. REITs may be affected by changes in the value of the underlying property owned by the REITs, while mortgage REITs may be affected by the quality of any credit extended. REITs are dependent upon management skills, may not be diversified geographically or by property/mortgage asset type, and are subject to heavy cash flow dependency, default by borrowers and self-liquidation. REITs may be more volatile and/or more illiquid than other types of equity securities. REITs (especially mortgage REITs) are subject to interest rate risks. REITs may incur significant amounts of leverage. The Fund will indirectly bear a portion of the expenses, including management fees, paid by each REIT in which it invests, in addition to the expenses of the Fund. REITs must also meet certain requirements under the Internal Revenue Code of 1986, as amended (the “Code”) to avoid entity level tax and be eligible to pass-through certain tax attributes of their income to shareholders. REITs are consequently subject to the risk of failing to meet these requirements for favorable tax treatment and of failing to maintain their exemptions from registration under the Investment Company Act of 1940. REITs are subject to the risks of changes in the Code affecting their tax status.
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Tax Law Change Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Tax Law Change Risk: All statements contained in this prospectus regarding the U.S. federal income tax consequences of an investment in the Fund are based on current law, which is subject to change at
   
any time, potentially with retroactive effect. For example, tax legislation enacted in 2017 (the Tax Cuts and Jobs Act) resulted in fundamental changes to the Internal Revenue Code (some of which are set to expire in the next few years). More recently, the Inflation Reduction Act of 2022 will add a 15% alternative minimum tax on large corporations and a 1% excise tax on repurchases of stock by publicly traded corporations and certain affiliates. The excise tax on repurchases of stock may cause some corporations in which the Fund invests to reduce liquidity opportunities for its investors, which could potentially reduce the value of your investment in the Fund. Such legislation, as well as possible future U.S. tax legislation and administrative guidance, could materially affect the tax consequences of your investment in the Fund and the Fund’s investments or holding structures.
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets 0.16%
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 1.80%
Other Expenses rr_OtherExpensesOverAssets 1.96% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.71%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 1.87%
Total Annual Fund Operating Expenses After Expense Waiver and Reimbursement rr_NetExpensesOverAssets 0.84% [2]
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 $ 663
PARNASSUS FUNDS | Parnassus Growth Equity Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets none
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 1.55%
Other Expenses rr_OtherExpensesOverAssets 1.55% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.30%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 1.67%
Total Annual Fund Operating Expenses After Expense Waiver and Reimbursement rr_NetExpensesOverAssets 0.63% [2]
1 Year rr_ExpenseExampleYear01 $ 64
3 Years rr_ExpenseExampleYear03 $ 558
[1] “Other Expenses” are estimated for the current fiscal year. Actual expenses may differ from estimates.
[2] The investment adviser has contractually agreed to waive 0.10% of its management fee for each class, and to reimburse the Fund for expenses to the extent necessary to limit total annual fund operating expenses to 0.84% of net assets for the Parnassus Growth Equity Fund—Investor Shares and to 0.63% of net assets for the Parnassus Growth Equity Fund—Institutional Shares. This agreement will not be terminated prior to May 1, 2024 and may be continued indefinitely by the investment adviser on a year-to-year basis.