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Baron Real Estate Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Baron Real Estate Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment goal of Baron Real Estate Income Fund® (the “Fund”) is a combination of capital appreciation and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you would pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table 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 August 29, 2035
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
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 for Fund shareholders. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the example, affect the Fund’s performance. During the most recent fiscal year ended December 31, 2024, the Fund’s portfolio turnover rate was 131% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 131.00%
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 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, giving effect to the
expense reimbursement agreement described above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund is a non-diversified fund that, under normal circumstances, invests at least 80% of its net assets in equity securities, real estate income-producing securities and other real estate securities of any market capitalization, debt securities, non-U.S. real estate income-producing securities, and any other real estate-related yield securities. Investments in non-U.S. securities are limited to 35% of the Fund’s total assets at the time of purchase. The Fund may invest in debt securities that have a rating of, or equivalent to, at least “BBB” by S&P Global Ratings or “Baa” by Moody’s Investors Services, Inc., or if unrated, are judged by the Adviser to be of comparable quality. The Fund may invest up to 35% of its total assets in such securities. Some debt securities purchased by the Fund may have very long maturities. The length of time remaining until maturity is one factor that the Adviser considers in purchasing a particular debt security.
The Fund is likely to maintain a significant portion of its assets in real estate investment trusts (“REITs”). REITs pool money to invest in properties (“equity REITs”) or mortgages (“mortgage REITs”), and their revenue primarily consists of rent derived from owned, income producing real estate properties, and capital gains from the sale of such properties. The Fund generally invests in equity REITs.
The Adviser seeks to invest in businesses it believes have sustainable competitive advantages, exceptional management, opportunities for growth, and an attractive valuation.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund is a non-diversified fund that, under normal circumstances, invests at least 80% of its net assets in equity securities, real estate income-producing securities and other real estate securities of any market capitalization, debt securities, non-U.S. real estate income-producing securities, and any other real estate-related yield securities. Investments in non-U.S. securities are limited to 35% of the Fund’s total assets at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table provide some indication of the risks of investing in the Fund (Retail Shares) by showing changes in the Fund’s performance from year to year and by showing how the Fund’s annual returns for 1 year, 5 years, and since inception compared with that of a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index, in that order. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at BaronCapitalGroup.com/daily-prices-and-performanceor by calling 1‑800‑99BARON (1‑800‑992‑2766).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund (Retail Shares) by showing changes in the Fund’s performance from year to year and by showing how the Fund’s annual returns for 1 year, 5 years, and since inception compared with that of a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index, in that order.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1‑800‑99BARON (1‑800‑992‑2766)
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress BaronCapitalGroup.com/daily-prices-and-performance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Return (%) for the year ended December 31 (Retail Shares)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:
3/31/19:  17.86%
Worst Quarter:
6/30/22: (18.43)%
Performance Table Heading rr_PerformanceTableHeading Annual Total Returns (for periods ended 12/31/24)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged This table shows how the Fund’s performance compares to that of the MSCI US REIT Index, which is a free float-adjusted market capitalization weighted index that is comprised of equity REITs, in which the Fund invests, and the S&P 500 Index, a broad-based securities index that reflects the overall U.S. equity market.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After‑tax returns are calculated using the highest individual federal marginal income tax rate in effect at the time of each distribution and assumed sale, but they do not include 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’s shares in a tax‑deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax‑exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The table also shows the average annual return of the Fund’s Institutional Shares and R6 Shares, but it does not show after‑tax returns.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The following table shows the Fund’s Retail Shares’ annual returns and long-term performance (before and after taxes) and the change in value of market indexes over various periods ended December 31, 2024. This table shows how the Fund’s performance compares to that of the MSCI US REIT Index, which is a free float-adjusted market capitalization weighted index that is comprised of equity REITs, in which the Fund invests, and the S&P 500 Index, a broad-based securities index that reflects the overall U.S. equity market. The table also shows the average annual return of the Fund’s Institutional Shares and R6 Shares, but it does not show after‑tax returns.
After‑tax returns are calculated using the highest individual federal marginal income tax rate in effect at the time of each distribution and assumed sale, but they do not include the impact of state and local taxes.
Your actual after‑tax returns depend on your own tax situation and may differ from those shown. After‑tax returns reflect past tax effects and are not predictive of future tax effects. After‑tax returns are not relevant to investors who hold their Fund’s shares in a tax‑deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax‑exempt.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns for the periods ended December 31, 2024
Baron Real Estate Income Fund | Risk Nondiversified Status [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Non‑Diversified Portfolio. The Fund is non‑diversified, which means it may have a greater percentage of its assets in a single issuer than a diversified fund. Because of this, a non‑diversified fund may invest a greater percentage of its assets in fewer issuers, and the performance of those issuers may have a greater effect on the performance of a non‑diversified fund versus a diversified fund. Thus, a non‑diversified fund is more likely to experience significant fluctuations in value, exposing the Fund to a greater risk of loss in any given period than a diversified fund.
Baron Real Estate Income Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Fund losses may be incurred due to declines in one or more markets in which Fund investments are made.
Baron Real Estate Income Fund | Real Estate Industry [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Real Estate Industry. In addition to general market conditions, the value of the Fund will be affected by the strength of the real estate markets. Factors that could affect the value of the Fund’s holdings include the following: overbuilding and increased competition; increases in property taxes and operating expenses; declines in the value of real estate; lack of availability of equity and debt financing to refinance maturing debt; vacancies due to economic conditions and tenant bankruptcies; losses due to costs resulting from natural disasters and/or environmental contamination and its related clean‑up; changes in interest rates; changes in zoning laws; casualty or condemnation losses; variations in rental income; changes in neighborhood values; and functional obsolescence and appeal of properties to tenants.
Baron Real Estate Income Fund | REIT [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
REIT. REITs generally are dependent upon management skills and may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers and self-liquidation. In addition, REITs could possibly fail to qualify for favorable tax treatment under applicable tax law. Various factors may also adversely affect a borrower’s or a lessee’s ability to meet its obligations to the REIT. In the event of a default by a borrower or lessee, the REIT may experience delays in enforcing its rights as a mortgagee or lessor and may incur substantial costs associated with protecting its investments.
Baron Real Estate Income Fund | Interest Rate [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Interest Rate. The Fund is subject to greater interest rate risk when compared to other stocks funds due to the chance that periods of rising interest rates may cause REIT stock prices to decline and the overall cost of borrowing to increase.
Baron Real Estate Income Fund | Credit and Interest Rate [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Credit and Interest Rate. The market value of debt securities is affected by changes in prevailing interest rates and the perceived credit quality of the issuer. When prevailing interest rates fall or perceived credit quality improves, the market value of the affected debt securities generally rises. Conversely, when interest rates rise or perceived credit quality weakens, the market value of the affected debt securities generally declines. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. Any additional interest rate increases in the future could cause the value of the Fund’s holdings to decrease. The magnitude of these fluctuations will be greater when the maturity of the debt securities is longer.
Baron Real Estate Income Fund | Concentration [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Concentration. The Fund’s strategy of concentrating in real estate income-producing and other real estate-related companies means that its performance will be closely tied to the performance of a particular market segment. The Fund’s
concentration in these companies may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in these companies would have a larger impact on the Fund than on a mutual fund that does not concentrate in such companies. At times, the performance of these companies will lag the performance of other industries or the broader market as a whole.
Baron Real Estate Income Fund | Growth Investing [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Growth Investing. Growth stocks can react differently to issuer, political, market and economic developments than the market as a whole and other types of stocks. Growth stocks tend to be more expensive relative to their earnings or assets compared to other types of stocks. As a result, because growth stocks tend to be sensitive to changes in their earnings and to increasing interest rates and inflation, they tend to be more volatile than other types of stocks. In response, from time to time, growth investing as an investment style may go out of favor with investors.
Baron Real Estate Income Fund | General Stock Market [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
General Stock Market. Fund losses may be incurred due to declines in one or more markets in which Fund investments are made. These declines may be the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s). In addition, turbulence as has recently been experienced, caused, among other reasons, by increased inflation, tightening monetary policy and interest rate increases by the US Federal Reserve or similar international bodies, and reduced liquidity in financial markets may continue to negatively affect many issuers, which could have an adverse effect on your Fund investment. Events involving limited liquidity, defaults, non-performance or other adverse developments that affect one industry, such as the financial services industry, or concerns or rumors about any events of these kinds, have in the past and may in the future lead to market-wide liquidity problems, may spread to other industries, and could negatively affect the value and liquidity of the Fund’s investments. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market, such as Russia’s invasion of Ukraine in February 2022 and the world-wide response to it, have and may continue to adversely impact issuers and markets worldwide. Increasingly strained relations between countries, including between the U.S. and traditional allies and/or adversaries, could adversely affect U.S. issuers as well as non-U.S. issuers that rely on the United States for trade. A fund’s securities may be negatively impacted by inflation (or expectations for inflation), interest rates, global demand for particular
products/services or resources, supply chain disruptions, natural disasters, pandemics, epidemics, terrorism, war, military confrontations, changes in trade regulations, elevated levels of government debt, internal unrest and discord, economic sanctions, regulatory events and governmental or quasi-governmental actions, among others. The active and expanding conflict in the Middle East between Israel and Hamas presents considerable market risks. Raising the ceiling on U.S. government debt has become increasingly politicized. Any failure to increase the total amount that the U.S. government is authorized to borrow could lead to a default on U.S. government obligations, with unpredictable consequences for economies and markets in the U.S. and elsewhere.
Baron Real Estate Income Fund | Non U S Securities [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Non‑U.S. Securities. Investing in non‑U.S. securities may involve additional risks to those inherent in investing in U.S. securities, including exchange rate fluctuations, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.
Baron Real Estate Income Fund | Small and Mid Sized Companies [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Small- and Mid‑Sized Companies. The Adviser believes there is more potential for capital appreciation in small- and mid‑sized companies, but there also may be more risk. Securities of small- and mid‑sized companies may not be well known to most investors, and the securities may be less actively traded than those of large businesses. The securities of small- and mid‑sized companies may fluctuate in price more widely than the stock market generally, and they may be more difficult to sell during market downturns. Small- and mid‑sized companies rely more on the skills of management and on their continued tenure. Investing in small- and mid‑sized companies requires a long-term outlook and may require shareholders to assume more risk and to have more patience than investing in the securities of larger, more established companies.
Baron Real Estate Income Fund | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.27%
Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%)
Total Annual Fund Operating Expenses After Expense Reimbursements rr_NetExpensesOverAssets 1.05% [1]
1 rr_ExpenseExampleYear01 $ 107
3 rr_ExpenseExampleYear03 334
5 rr_ExpenseExampleYear05 579
10 rr_ExpenseExampleYear10 $ 1,283
2018 rr_AnnualReturn2018 (11.33%)
2019 rr_AnnualReturn2019 36.67%
2020 rr_AnnualReturn2020 22.02%
2021 rr_AnnualReturn2021 29.08%
2022 rr_AnnualReturn2022 (27.61%)
2023 rr_AnnualReturn2023 15.19%
2024 rr_AnnualReturn2024 17.16%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.43%)
1 year rr_AverageAnnualReturnYear01 17.16%
5 years rr_AverageAnnualReturnYear05 9.00%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 9.30%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 29, 2017
Baron Real Estate Income Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.90%
Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%)
Total Annual Fund Operating Expenses After Expense Reimbursements rr_NetExpensesOverAssets 0.80% [1]
1 rr_ExpenseExampleYear01 $ 82
3 rr_ExpenseExampleYear03 255
5 rr_ExpenseExampleYear05 444
10 rr_ExpenseExampleYear10 $ 990
1 year rr_AverageAnnualReturnYear01 17.36%
5 years rr_AverageAnnualReturnYear05 9.28%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 9.53%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 29, 2017
Baron Real Estate Income Fund | R6 Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.90%
Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%)
Total Annual Fund Operating Expenses After Expense Reimbursements rr_NetExpensesOverAssets 0.80% [1]
1 rr_ExpenseExampleYear01 $ 82
3 rr_ExpenseExampleYear03 255
5 rr_ExpenseExampleYear05 444
10 rr_ExpenseExampleYear10 $ 990
1 year rr_AverageAnnualReturnYear01 17.45%
5 years rr_AverageAnnualReturnYear05 9.28%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 9.52%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 29, 2017
Baron Real Estate Income Fund | Return after taxes on distributions | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 16.67%
5 years rr_AverageAnnualReturnYear05 8.48%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 8.78%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 29, 2017
Baron Real Estate Income Fund | Return after taxes on distributions and sale of Fund shares | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 10.26%
5 years rr_AverageAnnualReturnYear05 6.94%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 7.27%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 29, 2017
Baron Real Estate Income Fund | MSCI US REIT Index (reflects no deduction for fees or expenses)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 7.49%
5 years rr_AverageAnnualReturnYear05 3.10%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 4.54%
Baron Real Estate Income Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 25.02%
5 years rr_AverageAnnualReturnYear05 14.53%
10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 13.83%
[1] BAMCO, Inc. (“BAMCO” or the “Adviser”) has agreed that, pursuant to a contract with an 11-year term terminating on August 29, 2035, it will reimburse certain expenses of the Fund, limiting net annual operating expenses (portfolio transaction costs, interest and dividend expense, acquired fund fees and expenses, fees and expenses related to filing foreign tax reclaims, and extraordinary expenses are not subject to the operating expense limitation) to 1.05% of average daily net assets of Retail Shares, 0.80% of average daily net assets of Institutional Shares, and 0.80% of average daily net assets of R6 Shares. Only the Board of Trustees of the Fund may terminate the expense reimbursement agreement prior to its termination date.