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Baron Focused Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Baron Focused Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment goal of Baron Focused Growth 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 ratemay 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 6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.00%
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 non-diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. small- and mid-sized growth companies. The Adviser defines small- and mid-sized companies as those, at the time of purchase, with market capitalizations up to the largest market cap stock in the Russell Midcap Growth Index at reconstitution. The Adviser seeks to invest in businesses it believes have significant opportunities for growth, sustainable competitive advantages, exceptional management, and an attractive valuation. Because of its long-term approach, the Fund could have a significant percentage of its assets invested in securities that have appreciated beyond their original market cap ranges.
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
Although Baron Focused Growth Fund was registered as a mutual fund on June 30, 2008, it has been managed in the same style and by the same portfolio manager since the predecessor partnership’s inception on May 31, 1996. The Fund was added as a series of Baron Select Funds, a Delaware statutory trust, on June 30, 2008. The Fund’s investment goals, policies, guidelines and restrictions are, in all material respects, equivalent to the predecessor partnership’s. The following information shows the Fund’s annual returns and long-term performance reflecting the actual fees and expenses that were charged when the Fund was a partnership and since it converted to a mutual fund. The predecessor partnership charged a 15% performance fee after it reached a certain performance benchmark. If the annual returns for the Fund did not reflect the performance fee for the years the partnership charged a performance fee, the returns would have been higher. The Fund does not charge a performance fee. From its inception on May 31, 1996 through June 30, 2008, the predecessor partnership was not subject to certain investment restrictions, diversification requirements and other restrictions of the Investment Company Act of 1940, as amended (the “1940 Act”), or the Internal Revenue Code of 1986, as amended (the “Code”), which if they had been applicable, might have adversely affected its performance. 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:
9/30/20:  43.62%
Worst Quarter:
6/30/22: (19.97)%
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 Russell 2500® Growth Index, which measures the performance of the small to mid-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000® Index, a broad-based securities index comprised of the 3,000 largest U.S. companies as determined by total market capitalization.
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), which includes its predecessor partnership’s average annual returns, 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 Russell 2500® Growth Index, which measures the performance of the small to mid-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000® Index, a broad-based securities index comprised of the 3,000 largest U.S. companies as determined by total market capitalization. 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. Because the predecessor partnership did not have a distribution policy prior to July 1, 2008, the Fund is unable to show after-tax returns prior to that date.
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 Focused Growth 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 will likely have a greater percentage of its assets in a single issuer than a diversified fund. As a result, a non‑diversified fund will likely invest a greater percentage of its assets in fewer issuers, and the performance of those issuers may have a greater effect on the Fund’s performance compared to 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 Focused Growth 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 Focused Growth 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 Focused Growth 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 Focused Growth Fund | Financials Sector [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Financials Sector. The financials industries are subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition. Uncertainty in the banking and financial systems can result in significant and widespread deterioration in market and economic conditions by disrupting access to capital and other financial services, which could adversely affect the performance of the Fund.
Baron Focused Growth 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 Focused Growth Fund | Risks of Emphasizing a Sector or Industry [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Risks of Emphasizing a Sector or Industry. If the Fund has invested a higher percentage of its total assets in a particular sector or industry, changes affecting that
sector or industry may have a significant impact on the performance of the Fund’s overall portfolio. The economies and financial markets of certain regions — such as Latin America, Asia, and Europe and the Mediterranean region — can be interdependent and may all decline at the same time.
Baron Focused Growth 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 Focused Growth 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 (2.42%)
2016 rr_AnnualReturn2016 0.67%
2017 rr_AnnualReturn2017 26.36%
2018 rr_AnnualReturn2018 3.75%
2019 rr_AnnualReturn2019 30.03%
2020 rr_AnnualReturn2020 122.21%
2021 rr_AnnualReturn2021 18.83%
2022 rr_AnnualReturn2022 (28.30%)
2023 rr_AnnualReturn2023 27.40%
2024 rr_AnnualReturn2024 29.52%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 43.62%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.97%)
1 year rr_AverageAnnualReturnYear01 29.52%
5 years rr_AverageAnnualReturnYear05 25.59%
10 years rr_AverageAnnualReturnYear10 18.00%
Since Inception rr_AverageAnnualReturnSinceInception 13.73%
Inception date rr_AverageAnnualReturnInceptionDate May 31, 1996
Baron Focused Growth 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 29.85% [1]
5 years rr_AverageAnnualReturnYear05 25.91% [1]
10 years rr_AverageAnnualReturnYear10 18.30% [1]
Since Inception rr_AverageAnnualReturnSinceInception 13.89% [1]
Inception date rr_AverageAnnualReturnInceptionDate May 29, 2009 [1]
Baron Focused Growth 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 29.85% [1]
5 years rr_AverageAnnualReturnYear05 25.92% [1]
10 years rr_AverageAnnualReturnYear10 18.31% [1]
Since Inception rr_AverageAnnualReturnSinceInception 13.89% [1]
Inception date rr_AverageAnnualReturnInceptionDate Aug. 31, 2016 [1]
Baron Focused Growth Fund | Return after taxes on distributions | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 29.52%
5 years rr_AverageAnnualReturnYear05 23.93%
10 years rr_AverageAnnualReturnYear10 16.76%
Since Inception rr_AverageAnnualReturnSinceInception 13.24%
Inception date rr_AverageAnnualReturnInceptionDate May 31, 1996
Baron Focused Growth Fund | Return after taxes on distributions and sale of Fund shares | Retail Shares  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 17.48%
5 years rr_AverageAnnualReturnYear05 20.85%
10 years rr_AverageAnnualReturnYear10 14.98%
Since Inception rr_AverageAnnualReturnSinceInception 12.44%
Inception date rr_AverageAnnualReturnInceptionDate May 31, 1996
Baron Focused Growth Fund | Russell 2500™ Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 13.90%
5 years rr_AverageAnnualReturnYear05 8.08%
10 years rr_AverageAnnualReturnYear10 9.45%
Since Inception rr_AverageAnnualReturnSinceInception 8.24%
Baron Focused Growth Fund | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 23.81%
5 years rr_AverageAnnualReturnYear05 13.86%
10 years rr_AverageAnnualReturnYear10 12.55%
Since Inception rr_AverageAnnualReturnSinceInception 9.79%
[1] Performance for the Institutional Shares prior to May 29, 2009 is based on the performance of the Retail Shares. Performance for the R6 Shares prior to August 31, 2016 is based on the performance of the Institutional Shares, and prior to May 29, 2009 is based on the Retail Shares. The Retail Shares have a distribution fee, but Institutional Shares and R6 Shares do not. If the annual returns for the Institutional Shares and R6 Shares prior to May 29, 2009 did not reflect this fee, the returns would be higher.