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Parnassus Endeavor Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Parnassus Endeavor Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Parnassus Endeavor 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 Endeavor 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, 2023
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Parnassus Endeavor 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 37.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 37.20%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock
For additional information about the Parnassus Endeavor 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 Endeavor 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 Endeavor Fund’s objective is to achieve capital appreciation by investing primarily in a diversified portfolio of equity securities. Equity securities include common and preferred stock. Under normal circumstances, the Fund will invest a minimum of 80% of its net assets (plus borrowings for investment purposes) in equity securities. These companies must, in the Adviser’s opinion, be undervalued, but they must also have good prospects for long-term capital appreciation over the course of the expected holding period. The Parnassus Endeavor 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 Fund may purchase foreign securities directly on foreign markets. 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 is fossil-fuel free, as it does not invest in companies that derive significant revenues from the extraction, exploration, production or refining of fossil fuels; 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 Adviser reviews the company’s income statement, cash flow statement and balance sheet, and analyzes the company’s sustainable strategic advantage and management team. Upon initial investment, a company’s stock must be deemed to represent relative value. To determine whether the company demonstrates relative value, the Adviser considers the companies valuation relative to its own valuation history and relative to similar companies operating in the same industry. The Adviser also takes 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 criteria. 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
All investments involve risk, and investing in the Parnassus Endeavor Fund is no exception. You could lose money investing in the Fund. The likelihood of loss may be greater if you invest for a shorter period of time. The Fund is intended for investors who can accept that there will be fluctuations in value. 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. The Fund’s principal risks include the following:
  
∎  
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 epidemic and pandemic diseases (such as the ongoing threat of the global COVID‑19 pandemic), including, without limitation, travel restrictions, 
   
closed international borders, quarantines, disruptions to supply chains and lower consumer demand; a rise in protectionist trade policies; slowing global economic growth; risks associated with the United Kingdom’s departure from the European Union (or “Brexit”); risks associated with international conflicts and wars and the risk of trade disputes and the possibility of changes to some international trade agreements 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. 
∎  
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. 
∎  
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. 
∎  
Management Risk. The Adviser may be wrong in its assessment of a company’s value and/or the stocks the Fund holds may not reach what the Adviser believes are their full values. From time to time, “value” investing falls out of favor with investors, and during those periods the Fund’s relative performance may suffer. 
∎  
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. 
∎  
Tax Law Change Risk: Tax law is subject to change, possibly with retroactive effect, or to different interpretations. In particular, Congress is considering 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. 
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
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 Endeavor 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 Endeavor 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 25.9% (quarter ended December 31, 2020), and the lowest return for a quarter was a loss of 25.0% (quarter ended March 31, 2020). 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (%) (all periods ended December 31, 2021)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective September 30, 2021, the Fund changed its broad-based securities market index from the S&P 500® Index to the Russell 1000® Value Index because it believes that the Russell 1000® Value Index better reflects the underlying holdings of the Fund pursuant to its current principal investment strategies.
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‑deferred 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 Endeavor Fund’s two share classes with that of the Russell 1000® Value Index and the S&P 500® Index (see “Index Descriptions” in the prospectus). Effective September 30, 2021, the Fund changed its broad-based securities market index from the S&P 500® Index to the Russell 1000® Value Index because it believes that the Russell 1000® Value Index better reflects the underlying holdings of the Fund pursuant to its current principal investment strategies. Figures are average annual returns for the one‑, five- and ten‑year periods ended December 31, 2021. The table is intended to demonstrate the risk of investing in the 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 1000® Value and S&P 500®, 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‑deferred 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 Endeavor 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 Endeavor Fund—Investor Shares and includes expenses that are not applicable to and are higher than those of the Institutional Shares.
Parnassus Endeavor Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets 0.19%
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.05%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.90%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.02%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.88% [1]
1 Year rr_ExpenseExampleYear01 $ 90
3 Years rr_ExpenseExampleYear03 294
5 Years rr_ExpenseExampleYear05 514
10 Years rr_ExpenseExampleYear10 $ 1,149
2012 rr_AnnualReturn2012 22.03%
2013 rr_AnnualReturn2013 31.15%
2014 rr_AnnualReturn2014 18.51%
2015 rr_AnnualReturn2015 3.25%
2016 rr_AnnualReturn2016 21.42%
2017 rr_AnnualReturn2017 19.81%
2018 rr_AnnualReturn2018 (13.49%)
2019 rr_AnnualReturn2019 33.29%
2020 rr_AnnualReturn2020 27.42%
2021 rr_AnnualReturn2021 31.12%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.90%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.00%)
One Year rr_AverageAnnualReturnYear01 31.12%
Five Years rr_AverageAnnualReturnYear05 18.21%
Ten Years rr_AverageAnnualReturnYear10 18.56%
Parnassus Endeavor Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Service Fees rr_Component1OtherExpensesOverAssets none
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.05%
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06%
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.65% [1]
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 225
5 Years rr_ExpenseExampleYear05 398
10 Years rr_ExpenseExampleYear10 $ 899
One Year rr_AverageAnnualReturnYear01 31.37%
Five Years rr_AverageAnnualReturnYear05 18.47%
Ten Years rr_AverageAnnualReturnYear10 18.74%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2015
Parnassus Endeavor Fund | Return After Taxes on Distributions | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 26.48%
Five Years rr_AverageAnnualReturnYear05 16.31%
Ten Years rr_AverageAnnualReturnYear10 16.63%
Parnassus Endeavor Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 21.57%
Five Years rr_AverageAnnualReturnYear05 14.34%
Ten Years rr_AverageAnnualReturnYear10 15.14%
Parnassus Endeavor Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 25.16%
Five Years rr_AverageAnnualReturnYear05 11.16%
Ten Years rr_AverageAnnualReturnYear10 12.97%
Parnassus Endeavor Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 28.71%
Five Years rr_AverageAnnualReturnYear05 18.47%
Ten Years rr_AverageAnnualReturnYear10 16.55%
[1] The investment adviser has contractually agreed to reduce its investment advisory fee to the extent necessary to limit total annual fund operating expenses to 0.88% of net assets for the Parnassus Endeavor Fund—Investor Shares and to 0.65% of net assets for the Parnassus Endeavor Fund—Institutional Shares. This agreement will not be terminated prior to May 1, 2023 and may be continued indefinitely by the investment adviser on a year-to-year basis.