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  <dei:DocumentCreationDate contextRef="Duration_29Jan2012_28Jan2013">2013-01-28</dei:DocumentCreationDate>
  <dei:DocumentEffectiveDate contextRef="Duration_29Jan2012_28Jan2013">2013-01-28</dei:DocumentEffectiveDate>
  <dei:DocumentPeriodEndDate contextRef="Duration_29Jan2012_28Jan2013">2012-09-30</dei:DocumentPeriodEndDate>
  <dei:AmendmentFlag contextRef="Duration_29Jan2012_28Jan2013">false</dei:AmendmentFlag>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleExpenseExampleTransposedBARONGROWTHFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBARONGROWTHFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Investment Goal &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The investment goal of Baron Growth Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation through long-term investments primarily in securities of small-sized growth companies.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The table below describes the fees and expenses that you would pay if you bought and held shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">Annual Fund Operating Expenses &lt;br/&gt;(Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">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. The example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Portfolio Turnover.&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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 Annual Fund Operating Expenses or in the example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year ended September 30, 2012, the Fund&amp;#8217;s portfolio turnover rate was 13.70% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Investments, Risks, and Performance &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;Principal Investment Strategies of the Fund</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The Fund invests for the long term primarily in equity securities in the form of common stock of small-sized growth companies with market capitalizations of under $2.5 billion at the time of purchase selected for their capital appreciation potential. The Fund purchases securities in businesses that BAMCO, Inc. (&amp;#8220;BAMCO&amp;#8221; or the &amp;#8220;Adviser&amp;#8221;) believes could double in value in four or five years, and then hopefully, double again in the next four or five years. The Adviser selects securities that it believes have favorable price-to-value characteristics, are well managed, have significant long term growth prospects and have significant barriers to competition. Of course, there can be no guarantee that the Adviser will be successful in achieving the Fund&amp;#8217;s investment goals. 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.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">Principal Risks of Investing in the Fund</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;General Stock Market.&lt;/b&gt; Investing in the stock market is risky because securities fluctuate in value. These fluctuations may be due to political, economic or general market circumstances. Other factors may affect a single company or industry but not the broader market. Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money. Current and future portfolio holdings in the Fund are subject to risk.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Small-Sized Companies.&lt;/b&gt; The Adviser believes there is more potential for capital appreciation in small-sized companies, but there also may be more risk. Securities of small-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-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-sized companies rely more on the skills of management and on their continued tenure. Investing in small-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.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Growth Investing.&lt;/b&gt; Growth stocks can react differently to issuer, political, market and economic developments than the market as a whole and other types of stocks. &lt;br /&gt;&lt;br /&gt;  Growth stocks tend to be more expensive relative to their earnings or assets compared to other types of stocks. As a result, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Performance &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund&amp;#8217;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 www.BaronFunds.com/performance or by calling 1-800-99BARON (1-800-992-2766).</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Year by Year Total Return (%)&lt;/b&gt; as of December 31 of Each Year (Retail Shares)</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Average Annual Total Returns&lt;/b&gt; (for periods ended 12/31/12)</rr:PerformanceTableHeading>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Investment Goal &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The investment goal of Baron Asset Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation through long-term investments primarily in securities of medium-sized companies with undervalued assets or favorable growth prospects.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The table below describes the fees and expenses that you would pay if you bought and held shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">Annual Fund Operating Expenses&lt;br/&gt;(Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">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. The example also assumes that your investment has a 5% return each year, and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Portfolio Turnover.&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The table below shows the Fund&amp;#8217;s Retail Shares&amp;#8217; annual returns and long-term performance (before and after taxes) and the change in value of broad-based market indexes over various periods ended December 31, 2012. The table also shows the average annual returns of the Fund&amp;#8217;s Institutional Shares, but it does not show after-tax returns. &lt;br /&gt;&lt;br /&gt;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. &lt;br /&gt;&lt;br /&gt;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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;Average Annual Total Returns for the periods ended December 31, 2012&lt;/b&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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 Annual Fund Operating Expenses or in the example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year ended September 30, 2012, the Fund&amp;#8217;s portfolio turnover rate was 13.11% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Investments, Risks, and Performance &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;Principal Investment Strategies of the Fund</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The Fund invests for the long term primarily in equity securities in the form of common stock of medium-sized growth companies with market capitalizations of between $1.5 billion and $12 billion at the time of purchase selected for their capital appreciation potential. The Fund purchases securities in businesses that BAMCO, Inc. (&amp;#8220;BAMCO&amp;#8221; or the &amp;#8220;Adviser&amp;#8221;) believes could double in value in four years. The Adviser selects securities that it believes have favorable price-to-value characteristics, are well managed, have significant long term growth prospects and have significant barriers to competition. Of course, there can be no guarantee that the Adviser will be successful in achieving the Fund&amp;#8217;s investment goals. 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.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">Principal Risks of Investing in the Fund</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Performance &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund&amp;#8217;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 www.BaronFunds.com/performance or by calling 1-800-99BARON (1-800-992-2766).</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Year by Year Total Return (%)&lt;/b&gt; as of December 31 of Each Year (Retail Shares)</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Average Annual Total Returns&lt;/b&gt; (for periods ended 12/31/12)</rr:PerformanceTableHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;div&gt; &lt;div class="MetaData"&gt; &lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 6px;"&gt;&amp;nbsp;&lt;/p&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Best&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;06/30/09:&amp;nbsp;  20.76% &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Worst&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;12/31/08: (26.10%)&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt; &lt;/div&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The table below shows the Fund&amp;#8217;s Retail Shares&amp;#8217; annual returns and long-term performance (before and after taxes) and the change in value of broad-based market indexes over various periods ended December 31, 2012. The table also shows the average annual returns of the Fund&amp;#8217;s Institutional Shares, but it does not show after-tax returns.&lt;br/&gt;&lt;br/&gt; 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.&lt;br/&gt;&lt;br/&gt; 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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;Average Annual Total Returns for the periods ended December 31, 2012 &lt;/b&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The Russell Midcap&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt; Growth Index is an unmanaged index of mid-cap growth companies. The S&amp;amp;P 500 Index is an unmanaged index of larger-cap companies.</rr:PerformanceTableClosingTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;Baron Asset Fund&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The Russell 2000&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt; Growth Index is an unmanaged index of U.S. small-cap growth companies. The S&amp;amp;P 500 Index is an unmanaged index of larger-cap companies.</rr:PerformanceTableClosingTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleExpenseExampleTransposedBARONSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBARONSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;b&gt;General Stock Market.&lt;/b&gt; Investing in the stock market is risky because securities fluctuate in value. These fluctuations may be due to political, economic or general market circumstances. Other factors may affect a single company or industry but not the broader market. Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money. Current and future portfolio holdings in the Fund are subject to risk.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Medium-Sized Companies.&lt;/b&gt; The Adviser believes there is more potential for capital appreciation in medium-sized companies, but there also may be more risk. Securities of medium-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 medium-sized companies may fluctuate in price more widely than the stock market generally, and they may be more difficult to sell during market downturns. Medium-sized companies rely more on the skills of management and on their continued tenure. Investing in medium-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.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Growth Investing.&lt;/b&gt; 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, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.</rr:RiskNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;div&gt; &lt;div class="MetaData"&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Best&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;06/30/09:&amp;nbsp;20.73% &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Worst&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;12/31/08: (27.51%)&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt; &lt;/div&gt;</rr:BarChartClosingTextBlock>
  <rr:ManagementFeesOverAssets id="Item_2" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets id="Item_3" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;&lt;a name="tx460654_20"&gt;&lt;/a&gt;Baron Small Cap Fund&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_4" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_5" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Investment Goal &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The investment goal of Baron Small Cap Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation through investments primarily in securities of small-sized growth companies.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The table below describes the fees and expenses that you would pay if you bought and held shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">Annual Fund Operating Expenses&lt;br/&gt;(Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">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. The example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Portfolio Turnover.&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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 Annual Fund Operating Expenses or in the example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year  ended September 30, 2012, the Fund&amp;#8217;s portfolio turnover rate was 28.02% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:OtherExpensesOverAssets id="Item_6" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0007</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_7" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.0006</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_8" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0132</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_9" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.0106</rr:ExpensesOverAssets>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_Member" unitRef="pure">0.2802</rr:PortfolioTurnoverRate>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Investments, Risks, and Performance &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;Principal Investment Strategies of the Fund</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The Fund invests 80% of its net assets in equity securities in the form of common stock of small-sized growth companies with market capitalizations of less than $2.5 billion at the time of purchase selected for their capital appreciation potential. The Fund seeks to purchase securities that BAMCO, Inc. (&amp;#8220;BAMCO&amp;#8221; or the &amp;#8220;Adviser&amp;#8221;) expects could increase in value 50% within two years. The Adviser selects securities that it believes have favorable price-to-value characteristics, are well managed, have significant long term growth prospects and have significant barriers to competition. Of course, there can be no guarantee that the Adviser will be successful in achieving the Fund&amp;#8217;s investment goals. 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.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">Principal Risks of Investing in the Fund</rr:RiskHeading>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="USD">134</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="USD">108</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="USD">418</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="USD">337</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="USD">723</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="USD">585</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="USD">1590</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="USD">1294</rr:ExpenseExampleYear10>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.1643</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.1474</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.1291</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_10" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.1674</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.16</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.036</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.0324</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.0308</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_11" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.0379</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0166</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0999</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.0957</rr:AverageAnnualReturnYear10>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;General Stock Market. &lt;/b&gt;Investing in the stock market is risky because securities fluctuate in value. These fluctuations may be due to political, economic or general market circumstances. Other factors may affect a single company or industry but not the broader market. Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money. Current and future portfolio holdings in the Fund are subject to risk.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Small-Sized Companies. &lt;/b&gt;The Adviser believes there is more potential for capital appreciation in small-sized companies, but there also may be more risk. Securities of small-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-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-sized companies rely more on the skills of management and on their continued tenure. Investing in small-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.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Special Situations. &lt;/b&gt;The Funds may invest in &amp;#8220;special situations.&amp;#8221; A special situation arises when, in the opinion of the Adviser, the securities of a company will be recognized and appreciate in value due to a specific anticipated development at that company. Such developments might include a new product, a management change, an acquisition or a technological advancement. The risk of investing in special situations is that the anticipated development does not occur or its impact is not what the Adviser expected.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Growth Investing. &lt;/b&gt;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, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.</rr:RiskNarrativeTextBlock>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.0887</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 id="Item_12" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.1009</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.071</rr:AverageAnnualReturnYear10>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Performance &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.1301</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.1241</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000583_MemberC000001636_Member" unitRef="pure">0.1181</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_13" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member" unitRef="pure">0.1307</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0851</rr:AverageAnnualReturnSinceInception>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund&amp;#8217;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 www.BaronFunds.com/performance or by calling 1-800-99BARON (1-800-992-2766).</rr:PerformanceNarrativeTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member">1994-12-31</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000583_MemberC000001636_Member">1994-12-31</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000583_MemberC000001636_Member">1994-12-31</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate id="Item_14" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000077819_Member">2009-05-29</rr:AverageAnnualReturnInceptionDate>
  <rr:ManagementFeesOverAssets id="Item_15" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets id="Item_16" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_17" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_18" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_19" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.0008</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_20" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.0006</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_21" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.0133</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_22" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.0106</rr:ExpensesOverAssets>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="USD">135</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="USD">108</rr:ExpenseExampleYear01>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="USD">421</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="USD">337</rr:ExpenseExampleYear03>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="USD">729</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="USD">585</rr:ExpenseExampleYear05>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.2031</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="USD">1601</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="USD">1294</rr:ExpenseExampleYear10>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">-0.2385</rr:BarChartLowestQuarterlyReturn>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.1531</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.1406</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.1159</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberRussellMidcap_Member" unitRef="pure">0.1581</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.16</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_23" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.1563</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.0116</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0023</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0083</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_24" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.0135</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberRussellMidcap_Member" unitRef="pure">0.0323</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0166</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0846</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.0931</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0814</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberRussellMidcap_Member" unitRef="pure">0.1032</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 id="Item_25" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.0941</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.071</rr:AverageAnnualReturnYear10>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_Member" unitRef="pure">0.137</rr:PortfolioTurnoverRate>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.107</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0986</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000582_MemberC000001635_Member" unitRef="pure">0.0958</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_26" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member" unitRef="pure">0.1074</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_27" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberRussellMidcap_Member" unitRef="pure">0.0916</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0871</rr:AverageAnnualReturnSinceInception>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">1-800-99BARON (1-800-992-2766)</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">www.BaronFunds.com/performance</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">The Fund&amp;#8217;s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">After-tax returns are not relevant to investors who hold their Fund&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">1-800-99BARON (1-800-992-2766)</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">www.BaronFunds.com/performance</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The Fund&amp;#8217;s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Year by Year Total Return (%)&lt;/b&gt; as of December 31 of Each Year (Retail Shares)</rr:BarChartHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;div&gt; &lt;div class="MetaData"&gt; &lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 6px;"&gt;&amp;nbsp;&lt;/p&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Best&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;06/30/09:&amp;nbsp;  20.31% &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Worst&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;12/31/08: (23.85%)&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt; &lt;/div&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;b&gt;Average Annual Total Returns &lt;/b&gt;(for periods ended 12/31/12)</rr:PerformanceTableHeading>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_Member" unitRef="pure">0.1311</rr:PortfolioTurnoverRate>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The table below shows the Fund&amp;#8217;s Retail Shares&amp;#8217; annual returns and long-term performance (before and after taxes) and the change in value of broad-based market indexes over various periods ended December 31, 2012. The table also shows the average annual returns of the Fund&amp;#8217;s Institutional Shares, but it does not show after-tax returns. &lt;br /&gt;&lt;br /&gt;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. &lt;br /&gt;&lt;br /&gt;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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Average Annual Total Returns for the periods ended December 31, 2012 &lt;/b&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money.</rr:RiskLoseMoney>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">The Russell 2000&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt; Growth Index is an unmanaged index of U.S. small-cap growth companies. The S&amp;amp;P 500 Index is an unmanaged index of larger-cap companies.</rr:PerformanceTableClosingTextBlock>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">1-800-99BARON (1-800-992-2766)</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">www.BaronFunds.com/performance</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">The Fund&amp;#8217;s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.2076</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">-0.261</rr:BarChartLowestQuarterlyReturn>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">After-tax returns are not relevant to investors who hold their Fund&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">After-tax returns are not relevant to investors who hold their Fund&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.2073</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">-0.2751</rr:BarChartLowestQuarterlyReturn>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.3882</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.2216</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0834</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.1183</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.1169</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">-0.4024</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.3526</rr:AnnualReturn2009>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.3175</rr:AnnualReturn2003>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.2347</rr:AnnualReturn2010>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.2661</rr:AnnualReturn2004>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">-0.0158</rr:AnnualReturn2011>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0571</rr:AnnualReturn2005>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.1798</rr:AnnualReturn2012>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.155</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0659</rr:AnnualReturn2007>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.2734</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.2713</rr:AnnualReturn2004>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">-0.3918</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.3424</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.2401</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.0124</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberC000001636_Member" unitRef="pure">0.1643</rr:AnnualReturn2012>
  <rr:ManagementFeesOverAssets id="Item_28" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets id="Item_29" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_30" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_31" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_32" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0006</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_33" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.0005</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_34" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0131</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_35" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.0105</rr:ExpensesOverAssets>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="USD">133</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="USD">107</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="USD">415</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="USD">334</rr:ExpenseExampleYear03>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.1246</rr:AnnualReturn2005>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="USD">718</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="USD">579</rr:ExpenseExampleYear05>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.1464</rr:AnnualReturn2006>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="USD">1579</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="USD">1283</rr:ExpenseExampleYear10>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.1013</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">-0.4075</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.317</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.2129</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">-0.0294</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member" unitRef="pure">0.1531</rr:AnnualReturn2012>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualFundOperatingExpensesTransposedBARONGROWTHFUND column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.1798</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.1239</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_36" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.183</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberRussellTwentyHundred_Member" unitRef="pure">0.1459</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.16</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0299</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.0283</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.0255</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_37" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.0318</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberRussellTwentyHundred_Member" unitRef="pure">0.0349</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0166</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.1027</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.0979</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.091</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 id="Item_38" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.1037</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberRussellTwentyHundred_Member" unitRef="pure">0.098</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.071</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member" unitRef="pure">0.0906</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.0866</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.0811</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_39" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member" unitRef="pure">0.0912</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberRussellTwentyHundred_Member" unitRef="pure">0.0339</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0459</rr:AverageAnnualReturnSinceInception>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualTotalReturnsBARONGROWTHFUNDBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualTotalReturnsBARONASSETFUNDBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000584_MemberC000001637_Member" unitRef="pure">0.1744</rr:AverageAnnualReturnYear01>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">&lt;b&gt;Baron Growth Fund&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:AverageAnnualReturnInceptionDate id="Item_40" contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000077818_Member">2009-05-29</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013S000000582_MemberC000001635_Member">1987-06-12</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000582_MemberC000001635_Member">1987-06-12</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000582_MemberC000001635_Member">1987-06-12</rr:AverageAnnualReturnInceptionDate>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualFundOperatingExpensesTransposedBARONASSETFUND column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000001637_Member">1997-09-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000584_MemberC000001637_Member">1997-09-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000584_MemberC000001637_Member">1997-09-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate id="Item_41" contextRef="Duration_29Jan2012_28Jan2013S000000584_MemberC000077820_Member">2009-05-29</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleExpenseExampleTransposedBARONOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBARONOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleExpenseExampleTransposedBARONFIFTHAVENUEGROWTHFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBARONFIFTHAVENUEGROWTHFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000582_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedBARONASSETFUND column period compact * ~&lt;/div&gt;

</rr:PerformanceTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualFundOperatingExpensesTransposedBARONSMALLCAPFUND column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualTotalReturnsBARONSMALLCAPFUNDBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000000583_Member">Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money.</rr:RiskLoseMoney>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberRussellTwentyHundred_Member" unitRef="pure">0.1459</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberRussellTwentyHundred_Member" unitRef="pure">0.0349</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberRussellTwentyHundred_Member" unitRef="pure">0.098</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000583_MemberRussellTwentyHundred_Member" unitRef="pure">0.0626</rr:AverageAnnualReturnSinceInception>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Investment Goal &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The investment goal of Baron Opportunity Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation through investments primarily in growth companies that benefit from technology advances.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The table below describes the fees and expenses that you would pay if you bought and held shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">Annual Fund Operating Expenses&lt;br/&gt;(Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">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. The example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Portfolio Turnover.&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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 Annual Fund Operating Expenses or in the example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year ended September 30, 2012, the Fund&amp;#8217;s portfolio turnover rate was 88.56% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Investments, Risks, and Performance &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;Principal Investment Strategies of the Fund</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The Fund invests primarily in equity securities in the form of common stock of high growth businesses selected for their capital appreciation potential. The Fund will invest at least 65% of its assets in equity securities of companies with market capitalizations between $1 billion and $15 billion at the time of purchase. Companies with market capitalizations that have moved outside of that range since the time of purchase will continue to be included in the $1 billion to $15 billion range for the purpose of the 65% requirement. The Adviser may invest in companies in any sector or industry that it believes will benefit from innovations and advances in technology. The Fund seeks to purchase securities that the Adviser expects could increase in value 100% within four to five years. The Adviser selects securities that it believes have favorable price-to-value characteristics, are well managed, have significant long term growth prospects and have significant barriers to competition. Of course, there can be no guarantee that the Adviser will be successful in achieving the Fund&amp;#8217;s investment goals.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">Principal Risks of Investing in the Fund</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;General Stock Market. &lt;/b&gt; Investing in the stock market is risky because securities fluctuate in value. These fluctuations may be due to political, economic or general market circumstances. Other factors may affect a single company or industry but not the broader market. Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money. Current and future portfolio holdings in the Fund are subject to risk.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Technology. &lt;/b&gt; Technology companies, including internet-related and information technology companies, as well as companies propelled by new technologies, may present the risk of rapid change and product obsolescence, and their successes may be difficult to predict for the long term. Some technology companies may be newly formed and have limited operating history and experience. Technology companies may also be adversely affected by changes in governmental policies, competitive pressures and changing demand. The securities of these companies may also experience significant price movements caused by disproportionate investor optimism or pessimism, with little or no basis in the companies&amp;#8217; fundamentals or economic conditions. &lt;br /&gt;&lt;br /&gt;  &lt;b&gt;Small- and Medium-Sized Companies.&lt;/b&gt; The Adviser believes there is more potential for capital appreciation in small- and medium-sized companies, but there also may be more risk. Securities of small- and medium-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 medium-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 medium-sized companies rely more on the skills of management and on their continued tenure. Investing in small- and medium-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.&lt;br /&gt;&lt;br /&gt; &lt;b&gt;Growth Investing.&lt;/b&gt; 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, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Performance &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund&amp;#8217;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 www.BaronFunds.com/performance or by calling 1-800-99BARON (1-800-992-2766).</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Year by Year Total Return (%)&lt;/b&gt; as of December 31 of Each Year (Retail Shares)</rr:BarChartHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;div&gt; &lt;div class="MetaData"&gt; &lt;p style="margin-top: 0px; margin-bottom: 0px; font-size: 6px;"&gt;&amp;nbsp;&lt;/p&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Best&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;06/30/03:&amp;nbsp;  31.80% &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Worst&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;12/31/08: (28.08%)&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt; &lt;/div&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Average Annual Total Returns&lt;/b&gt; (for periods ended 12/31/12)</rr:PerformanceTableHeading>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The table below shows the Fund&amp;#8217;s Retail Shares&amp;#8217; annual returns and long-term performance (before and after taxes) and the change in value of broad-based market indexes over various periods ended December 31, 2012. The table also shows the average annual returns of the Fund&amp;#8217;s Institutional Shares, but it does not show after-tax returns. &lt;br /&gt;&lt;br /&gt; 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. &lt;br /&gt;&lt;br /&gt; 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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Average Annual Total Returns for the periods ended December 31, 2012 &lt;/b&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The Russell Midcap&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt; Growth Index is an unmanaged index of mid-cap growth companies. The S&amp;amp;P 500 Index is an unmanaged index of larger-cap companies.</rr:PerformanceTableClosingTextBlock>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_Member" unitRef="pure">0.8856</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money.</rr:RiskLoseMoney>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">1-800-99BARON (1-800-992-2766)</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">www.BaronFunds.com/performance</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The Fund&amp;#8217;s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;b&gt;Baron Opportunity Fund&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ManagementFeesOverAssets id="Item_42" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets id="Item_43" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.01</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_44" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_45" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_46" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0014</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_47" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_48" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0139</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_49" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.0113</rr:ExpensesOverAssets>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="USD">142</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="USD">115</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="USD">440</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="USD">359</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="USD">761</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="USD">622</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="USD">1669</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="USD">1375</rr:ExpenseExampleYear10>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.1369</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.1342</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.0925</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_50" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.1404</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberRussellMidcap_Member" unitRef="pure">0.1581</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.16</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0315</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.031</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.027</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_51" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.0335</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberRussellMidcap_Member" unitRef="pure">0.0323</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0166</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.14</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.1397</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.1268</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 id="Item_52" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.1411</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberRussellMidcap_Member" unitRef="pure">0.1032</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.071</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0346</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.0343</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000585_MemberC000001638_Member" unitRef="pure">0.0301</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberRussellMidcap_Member" unitRef="pure">0.0095</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_53" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member" unitRef="pure">0.0354</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0225</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member">2000-02-29</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000585_MemberC000001638_Member">2000-02-29</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000585_MemberC000001638_Member">2000-02-29</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate id="Item_54" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000077821_Member">2009-05-29</rr:AverageAnnualReturnInceptionDate>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member">2003-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.318</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">-0.2808</rr:BarChartLowestQuarterlyReturn>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.738</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.2559</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.0705</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.1214</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.211</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">-0.4606</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.618</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.2543</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">-0.0616</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000585_MemberC000001638_Member" unitRef="pure">0.1369</rr:AnnualReturn2012>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualTotalReturnsBARONOPPORTUNITYFUNDBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000000584_Member">Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money.</rr:RiskLoseMoney>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualFundOperatingExpensesTransposedBARONOPPORTUNITYFUND column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Investment Goal &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The investment goal of Baron Fifth Avenue Growth Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation through investments primarily in securities of large-sized growth companies.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Fees and Expenses of the Fund &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The table below describes the fees and expenses that you would pay if you bought and held shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">Example</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">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. The example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same at 1.30% for the Retail Shares and 1.05% for the Institutional Shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Portfolio Turnover.&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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 Annual Fund Operating Expenses or in the example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year ended September 30, 2012, the Fund&amp;#8217;s portfolio turnover rate was 79.07% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The Fund invests primarily in equity securities in the form of common stock of large-sized growth companies with market capitalizations of more than $5 billion at the time of purchase selected for their capital appreciation potential. The Fund seeks to purchase securities that the Adviser expects could increase in value 100% within five years. The Adviser selects securities that it believes have favorable price-to-value characteristics, are well managed, have significant long term growth prospects and have significant barriers to competition. Of course, there can be no guarantee that the Adviser will be successful in achieving the Fund&amp;#8217;s investment goals.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">Principal Risks of Investing in the Fund</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Performance &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Baron Fifth Avenue Growth Fund&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">Annual Fund Operating Expenses&lt;br/&gt;(Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Investments, Risks, and Performance &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;Principal Investment Strategies of the Fund</rr:StrategyHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;General Stock Market.&lt;/b&gt; Investing in the stock market is risky because securities fluctuate in value. These fluctuations may be due to political, economic or general market circumstances. Other factors may affect a single company or industry but not the broader market. Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money. Current and future portfolio holdings in the Fund are subject to risk.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Growth Investing.&lt;/b&gt; 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, growth stocks tend to be sensitive to changes in their earnings and more volatile than other types of stocks.</rr:RiskNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund&amp;#8217;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 www.BaronFunds.com/performance or by calling 1-800-99BARON (1-800-992-2766).</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Year by Year Total Return (%)&lt;/b&gt; as of December 31 of Each Year (Retail Shares)</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;b&gt;Average Annual Total Returns&lt;/b&gt; (for periods ended 12/31/12)</rr:PerformanceTableHeading>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The table below shows the Fund&amp;#8217;s Retail Shares&amp;#8217; annual returns and long-term performance (before and after taxes) and the change in value of broad-based market indexes over various periods ended December 31, 2012. The table also shows the average annual returns of the Fund&amp;#8217;s Institutional Shares, but it does not show after-tax returns.&lt;br/&gt;&lt;br/&gt; 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.&lt;br/&gt;&lt;br/&gt; 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&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;Average Annual Total Returns for the periods ended December 31, 2012 &lt;/b&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The S&amp;amp;P 500 Index is an unmanaged index of larger-cap companies. The Russell 1000&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt; Growth Index is an unmanaged index of larger-cap growth companies.</rr:PerformanceTableClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;div&gt; &lt;div class="MetaData"&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Best&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;03/31/12:&amp;nbsp;22.69% &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt; &lt;table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt;&lt;td valign="top" width="14%" align="left"&gt;Worst&amp;nbsp;Quarter:&lt;/td&gt; &lt;td valign="top" align="left"&gt;&amp;nbsp;12/31/08: (25.16%)&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt; &lt;/div&gt;</rr:BarChartClosingTextBlock>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_Member" unitRef="pure">0.7907</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">Because the values of securities fluctuate, when you sell your investment in the Fund, you may lose money.</rr:RiskLoseMoney>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">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&amp;#8217;s performance from year to year and by showing how the Fund&amp;#8217;s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">1-800-99BARON (1-800-992-2766)</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">www.BaronFunds.com/performance</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">The Fund&amp;#8217;s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">After-tax returns are not relevant to investors who hold their Fund&amp;#8217;s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member">2012-03-31</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.2269</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">-0.2516</rr:BarChartLowestQuarterlyReturn>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0848</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.1017</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0564</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">-0.3892</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.3115</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.1057</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">-0.0258</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.2085</rr:AnnualReturn2012>
  <rr:AverageAnnualReturnInceptionDate id="Item_55" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member">2009-05-29</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000586_MemberC000001639_Member">2004-04-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000586_MemberC000001639_Member">2004-04-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member">2004-04-30</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.2085</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.2085</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.1356</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_56" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.212</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.16</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberRussellTenHundred_Member" unitRef="pure">0.1526</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0084</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.0052</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.006</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_57" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.0102</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0166</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberRussellTenHundred_Member" unitRef="pure">0.0312</rr:AverageAnnualReturnYear05>
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  <rr:AverageAnnualReturnYear10 xsi:nil="true" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000586_MemberC000001639_Member" unitRef="pure" />
  <rr:AverageAnnualReturnYear10 xsi:nil="true" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000586_MemberC000001639_Member" unitRef="pure" />
  <rr:AverageAnnualReturnYear10 id="Item_58" xsi:nil="true" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure" />
  <rr:AverageAnnualReturnYear10 xsi:nil="true" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberSAndpFiveHundredIndex_Member" unitRef="pure" />
  <rr:AverageAnnualReturnYear10 xsi:nil="true" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberRussellTenHundred_Member" unitRef="pure" />
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0433</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.0399</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000000586_MemberC000001639_Member" unitRef="pure">0.0369</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception id="Item_59" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.0444</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberSAndpFiveHundredIndex_Member" unitRef="pure">0.0512</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberRussellTenHundred_Member" unitRef="pure">0.0556</rr:AverageAnnualReturnSinceInception>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="USD">132</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="USD">107</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="USD">412</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="USD">334</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="USD">713</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="USD">579</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="USD">1568</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="USD">1283</rr:ExpenseExampleYear10>
  <rr:ManagementFeesOverAssets id="Item_60" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.009</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets id="Item_61" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.009</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_62" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_63" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_64" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.004</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_65" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.0036</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_66" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.0155</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_67" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.0126</rr:ExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_68" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">-0.0025</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_69" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">-0.0021</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets id="Item_70" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000001639_Member" unitRef="pure">0.013</rr:NetExpensesOverAssets>
  <rr:NetExpensesOverAssets id="Item_71" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000000586_MemberC000077822_Member" unitRef="pure">0.0105</rr:NetExpensesOverAssets>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualTotalReturnsBARONFIFTHAVENUEGROWTHFUNDBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000000586_Member">&lt;div style="display:none"&gt;~ http://www.baronfunds.com/role/ScheduleAnnualFundOperatingExpensesTransposedBARONFIFTHAVENUEGROWTHFUND column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:StrategyPortfolioConcentration contextRef="Duration_29Jan2012_28Jan2013S000000585_Member">The Adviser may invest in companies in any sector or industry that it believes will benefit from innovations and advances in technology.</rr:StrategyPortfolioConcentration>
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    <link:loc xlink:type="locator" xlink:href="#Item_42" xlink:label="Item_42_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_43" xlink:label="Item_43_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_44" xlink:label="Item_44_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_44_lbl" xlink:to="footnote_ManagementFeesOverAssets" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_45" xlink:label="Item_45_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_46" xlink:label="Item_46_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_46_lbl" xlink:to="footnote_ManagementFeesOverAssets" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_47" xlink:label="Item_47_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_47_lbl" xlink:to="footnote_ManagementFeesOverAssets" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_48" xlink:label="Item_48_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_48_lbl" xlink:to="footnote_ManagementFeesOverAssets" use="optional" priority="0" order="1.0" />
    <link:footnote xlink:type="resource" xlink:label="footnote_ExpensesOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_ExpensesOverAssets_2">BAMCO, Inc. ("BAMCO" or the "Adviser") has agreed that for so long as it serves as the Adviser to the Fund, it will reimburse certain expenses of the Fund, limiting net annual operating expenses (expenses such as portfolio transaction costs, interest, dividend and extraordinary expenses are not subject to the operating expense limitation) to 1.50% of average daily net assets of Retail Shares and 1.25% of average daily net assets of Institutional Shares. For the fiscal year ended September 30, 2012, no expense reimbursement was required for either share class.</link:footnote>
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    <link:loc xlink:type="locator" xlink:href="#Item_49" xlink:label="Item_49_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_49_lbl" xlink:to="footnote_ManagementFeesOverAssets" use="optional" priority="0" order="1.0" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_49_lbl" xlink:to="footnote_ExpensesOverAssets_2" use="optional" priority="0" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_15" xlink:label="ManagementFeesOverAssets_2" />
    <link:footnote xlink:type="resource" xlink:label="footnote_ManagementFeesOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_ManagementFeesOverAssets_2">Based on fiscal year ended September 30, 2012. </link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets_2" xlink:to="footnote_ManagementFeesOverAssets_2" />
    <link:loc xlink:type="locator" xlink:href="#Item_16" xlink:label="Item_16_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_16_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_17" xlink:label="Item_17_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_19" xlink:label="Item_19_lbl" />
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    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_21_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_22" xlink:label="Item_22_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_22_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_10" xlink:label="AverageAnnualReturnYear01" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AverageAnnualReturnYear01" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AverageAnnualReturnYear01">Performance of the Institutional Shares prior to May 29, 2009 is based on the performance of the Retail Shares, which have a distribution fee. The Institutional Shares do not have a distribution fee. If the annual returns prior to May 29, 2009 did not reflect this fee, the returns would be higher. </link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="AverageAnnualReturnYear01" xlink:to="footnote_AverageAnnualReturnYear01" />
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    <link:loc xlink:type="locator" xlink:href="#Item_12" xlink:label="Item_12_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_13" xlink:label="Item_13_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_14" xlink:label="Item_14_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_25" xlink:label="Item_25_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_26" xlink:label="Item_26_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_36" xlink:label="Item_36_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_37" xlink:label="Item_37_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_38" xlink:label="Item_38_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_40" xlink:label="Item_40_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_40_lbl" xlink:to="footnote_AverageAnnualReturnYear01" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_41" xlink:label="Item_41_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_41_lbl" xlink:to="footnote_AverageAnnualReturnYear01" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_27" xlink:label="AverageAnnualReturnSinceInception" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AverageAnnualReturnSinceInception" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AverageAnnualReturnSinceInception">For the period June 30, 1987 to December 31, 2012.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="AverageAnnualReturnSinceInception" xlink:to="footnote_AverageAnnualReturnSinceInception" />
    <link:loc xlink:type="locator" xlink:href="#Item_50" xlink:label="AverageAnnualReturnYear01_2" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AverageAnnualReturnYear01_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AverageAnnualReturnYear01_2">Performance of the Institutional Shares prior to May 29, 2009 is based on the performance of the Retail Shares, which have a distribution fee. The Institutional Shares do not have a distribution fee. If the annual returns for the Institutional Shares did not reflect this fee, the returns would be higher. </link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="AverageAnnualReturnYear01_2" xlink:to="footnote_AverageAnnualReturnYear01_2" />
    <link:loc xlink:type="locator" xlink:href="#Item_51" xlink:label="Item_51_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_51_lbl" xlink:to="footnote_AverageAnnualReturnYear01_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_52" xlink:label="Item_52_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_52_lbl" xlink:to="footnote_AverageAnnualReturnYear01_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_53" xlink:label="Item_53_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_53_lbl" xlink:to="footnote_AverageAnnualReturnYear01_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_54" xlink:label="Item_54_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_54_lbl" xlink:to="footnote_AverageAnnualReturnYear01_2" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_55" xlink:label="AverageAnnualReturnInceptionDate" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AverageAnnualReturnInceptionDate" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AverageAnnualReturnInceptionDate">                                  Performance of the Institutional Shares prior to May 29, 2009 is based on the performance of the Retail Shares, which have a distribution fee. The Institutional Shares do not have a distribution fee. If the annual returns for the Institutional Shares did not reflect this fee, the returns would be higher.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="AverageAnnualReturnInceptionDate" xlink:to="footnote_AverageAnnualReturnInceptionDate" />
    <link:loc xlink:type="locator" xlink:href="#Item_56" xlink:label="Item_56_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_56_lbl" xlink:to="footnote_AverageAnnualReturnInceptionDate" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_57" xlink:label="Item_57_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_57_lbl" xlink:to="footnote_AverageAnnualReturnInceptionDate" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_58" xlink:label="Item_58_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_58_lbl" xlink:to="footnote_AverageAnnualReturnInceptionDate" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_59" xlink:label="Item_59_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_59_lbl" xlink:to="footnote_AverageAnnualReturnInceptionDate" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_60" xlink:label="ManagementFeesOverAssets_3" />
    <link:footnote xlink:type="resource" xlink:label="footnote_ManagementFeesOverAssets_3" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_ManagementFeesOverAssets_3">Estimated based on the fiscal year ended September 30, 2012.</link:footnote>
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    <link:loc xlink:type="locator" xlink:href="#Item_62" xlink:label="Item_62_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_64" xlink:label="Item_64_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_65" xlink:label="Item_65_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_66" xlink:label="Item_66_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_68" xlink:label="Item_68_lbl" />
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    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_69_lbl" xlink:to="footnote_ManagementFeesOverAssets_3" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_70" xlink:label="Item_70_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_70_lbl" xlink:to="footnote_ManagementFeesOverAssets_3" use="optional" priority="0" order="1.0" />
    <link:footnote xlink:type="resource" xlink:label="footnote_NetExpensesOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_NetExpensesOverAssets_2">BAMCO, Inc. ("BAMCO" or the "Adviser") has agreed that for so long as it serves as the Adviser to the Fund, it will reimburse certain expenses of the Fund, limiting net annual operating expenses (expenses such as portfolio transaction costs, interest, dividend and extraordinary expenses are not subject to the operating expense limitation) to 1.30% of average daily net assets of Retail Shares and 1.05% of average daily net assets of Institutional Shares.</link:footnote>
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