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Parnassus Mid Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Parnassus Mid Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Parnassus Mid Cap Growth 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 Mid Cap Growth 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 Mid Cap Growth 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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 41.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 41.50%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock
For additional information about the Parnassus Mid Cap Growth Fund’s expenses, please see “Financial Highlights” in the prospectus.
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 Mid Cap Growth 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
remain the same. 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 Mid Cap Growth Fund normally invests at least 80% of its net assets (plus borrowings for investment purposes) in mid-sized growth companies. The Fund considers a mid-sized company to be one that has a market capitalization between that of the smallest and largest constituents of the Russell Midcap® Growth Index (which was between $2.7 billion and $56.5 billion as of April 30, 2024) 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 Midcap® Growth Index, which are subject to change. The Fund may normally invest up to 20% of its net assets in smaller-and larger-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. 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. As part of the Adviser’s investment approach, the Adviser seeks to invest in companies with sustainable business practices, in alignment with our investment philosophy, as we believe these factors are relevant to our assessment of quality and the risk-return profiles of companies in the Funds. The Fund will evaluate whether it 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 or if the company no longer meets the Adviser’s sustainable investment expectations and the Adviser does not believe it is an appropriate investment for the Fund following such changes.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table that follow contain information that allows you to evaluate the Parnassus Mid Cap Growth Fund’s performance using several measures, such as yearly changes in performance, best and worst quarterly returns, and average annual total returns before and after taxes compared to a broad measure of market performance. The bar chart shows the performance of the Fund’s Investor Shares, and the performance of the Fund’s Institutional Shares will differ from those shown to the extent that the classes of shares do not have the same expenses or inception date. 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 Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow contain information that allows you to evaluate the Parnassus Mid Cap Growth Fund’s performance using several measures, such as yearly changes in performance, best and worst quarterly returns, and average annual total returns before and after taxes compared to 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.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (%)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the ten-year period shown in the bar chart, the highest return for a quarter was 25.8% (quarter ended June 30, 2020), and the lowest return for a quarter was a loss of 21.9% (quarter ended June 30, 2022).
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (%)(all periods ended December 31, 2024)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
Following is a table comparing the performance of the Parnassus Mid Cap Growth Fund’s two share classes with that of the Russell Midcap® Growth Index and Russell 1000® Index. Figures are average annual returns for the one-, five- and ten-year periods ended December 31, 2024. The table is intended to demonstrate the risk of investing in the Parnassus Mid Cap Growth Fund by showing how the Fund’s average annual total returns, before and after taxes, compare with a broad measure of market performance, the Russell Midcap® Growth Index and Russell 1000® Index, and also how the Fund’s performance varies from year to year.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The after-tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s individual tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. After-tax returns are shown for Investor Shares only. After-tax returns for Institutional Shares will vary.
Parnassus Mid Cap Growth Fund—Institutional Shares were incepted on April 30, 2015. Performance shown prior to the inception of the Institutional Shares reflects the performance of the Parnassus Mid Cap Growth Fund—Investor Shares and includes expenses that are not applicable to and are higher than those of the Institutional Shares.
Parnassus Mid Cap Growth Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money investing in the Fund.
Parnassus Mid Cap Growth 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 Mid Cap Growth 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 Mid Cap Growth 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 Mid Cap Growth 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. The Fund invests primarily in mid-capitalization companies, and may also invest in small- capitalization companies, both of 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 Mid Cap Growth 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 Mid Cap Growth 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 Mid Cap Growth Fund | Foreign Non US Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Foreign (Non-U.S.) 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, 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 Mid Cap Growth 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 Mid Cap Growth Fund | Tax Law Change Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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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 Mid Cap Growth 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 Mid Cap Growth Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets 0.10%
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.09%
Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.81%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.01%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.80% [1]
1 Year rr_ExpenseExampleYear01 $ 82
3 Years rr_ExpenseExampleYear03 258
5 Years rr_ExpenseExampleYear05 449
10 Years rr_ExpenseExampleYear10 $ 1,001
2015 rr_AnnualReturn2015 0.26%
2016 rr_AnnualReturn2016 13.46%
2017 rr_AnnualReturn2017 16.08%
2018 rr_AnnualReturn2018 (9.73%)
2019 rr_AnnualReturn2019 29.82%
2020 rr_AnnualReturn2020 28.61%
2021 rr_AnnualReturn2021 9.37%
2022 rr_AnnualReturn2022 (33.52%)
2023 rr_AnnualReturn2023 35.60%
2024 rr_AnnualReturn2024 10.55%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.80%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.90%)
One Year rr_AverageAnnualReturnYear01 10.55%
Five Years rr_AverageAnnualReturnYear05 6.99%
Ten Years rr_AverageAnnualReturnYear10 8.05%
Parnassus Mid Cap Growth Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets none
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Other Expenses rr_OtherExpensesOverAssets 0.08%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.70%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.02%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.68% [1]
1 Year rr_ExpenseExampleYear01 $ 69
3 Years rr_ExpenseExampleYear03 222
5 Years rr_ExpenseExampleYear05 388
10 Years rr_ExpenseExampleYear10 $ 869
One Year rr_AverageAnnualReturnYear01 10.68%
Five Years rr_AverageAnnualReturnYear05 7.12%
Ten Years rr_AverageAnnualReturnYear10 8.19%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2015
Parnassus Mid Cap Growth Fund | Return After Taxes on Distributions | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 8.86%
Five Years rr_AverageAnnualReturnYear05 5.92%
Ten Years rr_AverageAnnualReturnYear10 6.46%
Parnassus Mid Cap Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 7.62%
Five Years rr_AverageAnnualReturnYear05 5.41%
Ten Years rr_AverageAnnualReturnYear10 6.08%
Parnassus Mid Cap Growth Fund | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 22.10%
Five Years rr_AverageAnnualReturnYear05 11.47%
Ten Years rr_AverageAnnualReturnYear10 11.54%
Parnassus Mid Cap Growth Fund | Russell 1000® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 24.51%
Five Years rr_AverageAnnualReturnYear05 14.28%
Ten Years rr_AverageAnnualReturnYear10 12.87%
[1] The investment adviser has contractually agreed to reimburse the Fund for expenses to the extent necessary to limit total annual fund operating expenses to 0.80% of net assets for the Parnassus Mid Cap Growth Fund—Investor Shares and to 0.68% of net assets for the Parnassus Mid Cap Growth 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.