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Baron Real Estate Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Baron Real Estate Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment goal of Baron Real Estate Fund® (the “Fund”) is capital appreciation.
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)
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 77% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 77.00%
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. 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 diversified fund that, under normal circumstances, invests at least 80% of its net assets in equity securities of U.S. and non-U.S. real estate and real estate-related companies of any market capitalization, and in companies which, in the opinion of BAMCO, Inc. (“BAMCO” or the “Adviser”), own significant real estate assets at the time of investment (“real estate companies”), however, investments in non-U.S. securities are limited to 35% of the Fund’s total assets at the time of purchase. The Adviser seeks to invest in businesses it believes have significant opportunities for growth, sustainable competitive advantages, exceptional management, and an attractive valuation.
Real estate companies are companies that the Adviser determines are in the real estate industry based on their involvement in construction, ownership, management, operation, financing, refinancing, sales, leasing, development or rehabilitation of real estate or are in a real estate-related industry based on their provision of goods or services to the real estate industry.
A company is considered to own significant real estate assets if, in the opinion of the Adviser, the company has a substantial portion of its assets attributable to one or more of the following: (a) real estate owned or leased by the company as lessor or as lessee; or (b) the discounted value of the stream of fees or revenues derived from the management or operation of real estate.
Examples of companies that might qualify under one of these categories include:
∎  
Real estate operating companies;
∎  
Real estate investment trusts (“REITs”);
∎  
Homebuilders;
∎  
Hotel, hotel management companies and gaming companies;
∎  
Real estate brokerage/services companies and/or management companies;
∎  
Financial institutions that make or service mortgage loans;
∎  
Manufacturers or distributors of construction materials and/or building supplies/products;
∎  
Home furnishing and home improvement retail companies;
∎  
Companies with significant real estate holdings such as supermarkets, restaurant chains and retail chains;
∎  
Construction and engineering companies; and
∎  
Companies with infrastructure-related assets such as toll roads, bridges, tunnels, parking facilities, railroads, airports, broadcast and wireless towers, electric transmission and distribution lines, power generation facilities, hospitals and correctional facilities.
The Fund will invest more than 25% of its net assets in the real estate industry.
The investment policy of the Fund relating to the types of securities in which 80% of the Fund’s assets must be invested may be changed by the Fund’s Board of Trustees without shareholder approval upon at least 60 days’ notice.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund will invest more than 25% of its net assets in the real estate industry.
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 average annual returns for 1, 5, 10 years, and since inception compare with those 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-performance or 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 average annual returns for 1, 5, 10 years, and since inception compare with those 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 Year by Year Total Return (%) as of December 31 of Each Year (Retail Shares)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:
6/30/20:  29.82%
Worst Quarter:
6/30/22: (20.70)%
Performance Table Heading rr_PerformanceTableHeading Average 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 USA IMI Extended Real Estate Index, which is a free float-adjusted market capitalization index based on the MSCI USA IMI, that consists of large, mid and small cap segments of the US equity market, 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 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 returns 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 USA IMI Extended Real Estate Index, which is a free float-adjusted market capitalization index based on the MSCI USA IMI, that consists of large, mid and small cap segments of the US equity market, 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 returns 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 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 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 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 Fund | Concentration [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Concentration. The Fund’s strategy of concentrating in real estate and 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 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 Fund | Consumer Discretionary Sectors [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Consumer Discretionary Sector. The consumer discretionary sector may be affected by changes in domestic and international economies, exchange and interest rates, inflation, competition, consumers’ disposable income, consumer preferences, social trends and marketing campaigns.
Baron Real Estate 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 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 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 Fund | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.06%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.31%
1 rr_ExpenseExampleYear01 $ 133
3 rr_ExpenseExampleYear03 415
5 rr_ExpenseExampleYear05 718
10 rr_ExpenseExampleYear10 $ 1,579
2015 rr_AnnualReturn2015 (4.65%)
2016 rr_AnnualReturn2016 (2.01%)
2017 rr_AnnualReturn2017 31.04%
2018 rr_AnnualReturn2018 (22.22%)
2019 rr_AnnualReturn2019 44.11%
2020 rr_AnnualReturn2020 43.85%
2021 rr_AnnualReturn2021 24.03%
2022 rr_AnnualReturn2022 (28.61%)
2023 rr_AnnualReturn2023 24.70%
2024 rr_AnnualReturn2024 12.19%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.70%)
1 year rr_AverageAnnualReturnYear01 12.19%
5 years rr_AverageAnnualReturnYear05 12.25%
10 years rr_AverageAnnualReturnYear10 9.35%
Since Inception rr_AverageAnnualReturnSinceInception 13.39%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2009
Baron Real Estate Fund | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
1 rr_ExpenseExampleYear01 $ 107
3 rr_ExpenseExampleYear03 334
5 rr_ExpenseExampleYear05 579
10 rr_ExpenseExampleYear10 $ 1,283
1 year rr_AverageAnnualReturnYear01 12.46%
5 years rr_AverageAnnualReturnYear05 12.54%
10 years rr_AverageAnnualReturnYear10 9.64%
Since Inception rr_AverageAnnualReturnSinceInception 13.68%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2009
Baron Real Estate Fund | R6 Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
1 rr_ExpenseExampleYear01 $ 107
3 rr_ExpenseExampleYear03 334
5 rr_ExpenseExampleYear05 579
10 rr_ExpenseExampleYear10 $ 1,283
1 year rr_AverageAnnualReturnYear01 12.46% [1]
5 years rr_AverageAnnualReturnYear05 12.54% [1]
10 years rr_AverageAnnualReturnYear10 9.64% [1]
Since Inception rr_AverageAnnualReturnSinceInception 13.68% [1]
Inception date rr_AverageAnnualReturnInceptionDate Jan. 29, 2016 [1]
Baron Real Estate Fund | Return after taxes on distributions | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 12.14%
5 years rr_AverageAnnualReturnYear05 11.19%
10 years rr_AverageAnnualReturnYear10 8.07%
Since Inception rr_AverageAnnualReturnSinceInception 12.43%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2009
Baron Real Estate Fund | Return after taxes on distributions and sale of Fund shares | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 7.25%
5 years rr_AverageAnnualReturnYear05 9.55%
10 years rr_AverageAnnualReturnYear10 7.25%
Since Inception rr_AverageAnnualReturnSinceInception 11.31%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2009
Baron Real Estate Fund | MSCI USA IMI Extended Real Estate Index (reflects no deduction for fees or expenses)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 12.70%
5 years rr_AverageAnnualReturnYear05 8.50%
10 years rr_AverageAnnualReturnYear10 8.61%
Since Inception rr_AverageAnnualReturnSinceInception 11.18%
Baron Real Estate 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 4.38%
Since Inception rr_AverageAnnualReturnSinceInception 8.03%
Baron Real Estate 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 13.10%
Since Inception rr_AverageAnnualReturnSinceInception 13.88%
[1] Performance for the R6 Shares prior to January 29, 2016 is based on the performance of the Institutional Shares.