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    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. &amp;#160;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information. &amp;#160;&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. &amp;#160;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
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    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example.&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example. &amp;#160;&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example.&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example: &amp;#160;&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example. &amp;#160;&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example. &amp;#160;&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;This Example is intended to help you compare the cost of investing&#13;in the Fund with the cost of investing in other mutual funds. &amp;#160;The Example assumes that you invest $10,000 in the Fund for&#13;the time periods indicated and then redeem all of your shares at the end of those periods. &amp;#160;The Example also assumes that&#13;your investment has a 5% return each year and that the operating expenses remain the same. &amp;#160;Although your actual costs may&#13;be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
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    <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ExpenseExample column period compact * column dei_LegalEntityAxis compact EVMT_S000004843Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund pays transaction costs, such as commissions, when&#13;it buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year, the Fund's portfolio turnover rate was 13 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund pays transaction costs, such as commissions, when&#13;it buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year , the Fund's portfolio turnover rate was 85 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund pays transaction costs, such as commissions, when&#13;it buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year, the Fund's portfolio turnover rate was 15 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund pays transaction costs, such as commissions, when&#13;it buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year, the Fund's portfolio turnover rate was 6% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund pays transaction costs, such as commissions, when&#13;it buys and sells securities (or &amp;#147;turns over&amp;#148; the portfolio). &amp;#160;A higher portfolio turnover rate may indicate higher&#13;transaction costs and may result in higher taxes when Fund shares are held in a taxable account. &amp;#160;These costs, which are not&#13;reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#146;s performance. During the most recent fiscal&#13;year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions , if securities are rated differently by the rating agencies&#13;, the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund normally acquires&#13;municipal obligations with maturities of ten years or more. &amp;#160;The Fund&amp;#146;s portfolio often has a longer average maturity&#13;than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As a result, the interest rate risk described&#13;below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of&#13;municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one&#13;or more sectors (such as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating&#13;agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio manager also may trade securities&#13;to seek to minimize taxable capital gains to shareholders. &amp;#160;A portion of the Fund&amp;#146;s distributions generally will be&#13;subject to the federal alternative minimum tax. &amp;#160;&lt;i&gt;The Fund may not be suitable for investors subject to the federal alternative&#13;minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund normally acquires&#13;municipal obligations with maturities of ten years or more. &amp;#160;The Fund&amp;#146;s portfolio often has a longer average maturity&#13;than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As a result, the interest rate risk described&#13;below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of&#13;municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one&#13;or more sectors (such as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating&#13;agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio manager also may trade securities&#13;to seek to minimize taxable capital gains to shareholders. &amp;#160;A portion of the Fund&amp;#146;s distributions generally will be&#13;subject to the federal alternative minimum tax. &amp;#160;&lt;i&gt;The Fund may not be suitable for investors subject to the federal alternative&#13;minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the &amp;#147;80%&#13;Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the interest from which is subject to the federal alternative&#13;minimum tax. &amp;#160;The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality.&#13;The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (&amp;#147;junk bonds&amp;#148;). &amp;#160;Below&#13;investment grade obligations are those obligations rated below Baa by Moody&amp;#146;s Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;),&#13;or below BBB by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;) or Fitch Ratings (&amp;#147;Fitch&amp;#148;).&#13;&amp;#160;For the purposes of rating restrictions, the higher rating is used. &amp;#160;The Fund may invest up to 20% of its net assets&#13;in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations&#13;of the U.S. Government, its agencies and instrumentalities (&amp;#147;Agency Securities&amp;#148;). &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund may purchase derivative instruments, which derive&#13;their value from another instrument, security or index. The Fund may purchase or sell various kinds of residual interest bonds,&#13;financial futures contracts and options thereon to hedge against changes in interest rates or as a substitute for the purchase&#13;of portfolio securities. The Fund also may enter into interest rate swaps, forward rate contracts and credit derivatives, which&#13;may include credit default swaps, total return swaps or credit options, as well as purchase an instrument that has greater or lesser&#13;credit risk than the municipal bonds underlying the instrument.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund may acquire&#13;municipal obligations with varying maturities . &amp;#160;Depending on the Fund&amp;#146;s average maturity, the interest rate risk described&#13;below may be more or less significant for the Fund. The longer the Fund&amp;#146;s average maturity the more significant interest&#13;rate risk will be for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations&#13;(such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such&#13;as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. &amp;#160;In evaluating creditworthiness, the investment adviser considers ratings assigned&#13;by rating agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio managers generally will&#13;seek to enhance after-tax total return by balancing investment considerations and tax considerations. &amp;#160;The Fund expects to&#13;actively engage in relative value trading to take advantage of price appreciation opportunities or to realize capital losses. &amp;#160;A&#13;portion of the Fund&amp;#146;s distributions generally will be subject to the federal alternative minimum tax. &lt;i&gt;The Fund may not&#13;be suitable for investors subject to the federal alternative minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund normally acquires&#13;municipal obligations with maturities of ten years or more. &amp;#160;The Fund&amp;#146;s portfolio often has a longer average maturity&#13;than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As a result, the interest rate risk described&#13;below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of&#13;municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one&#13;or more sectors (such as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating&#13;agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio manager also may trade securities&#13;to seek to minimize taxable capital gains to shareholders. &amp;#160;A portion of the Fund&amp;#146;s distributions generally will be&#13;subject to the federal alternative minimum tax. &amp;#160;&lt;i&gt;The Fund may not be suitable for investors subject to the federal alternative&#13;minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund normally acquires&#13;municipal obligations with maturities of ten years or more. The Fund&amp;#146;s portfolio often has a longer average maturity&#13;than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As a result, the interest rate risk described&#13;below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of&#13;municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one&#13;or more sectors (such as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating&#13;agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio manager also may trade securities&#13;to seek to minimize taxable capital gains to shareholders. &amp;#160;A portion of the Fund&amp;#146;s distributions generally will be&#13;subject to the federal alternative minimum tax. &amp;#160; &lt;i&gt;The Fund may not be suitable for investors subject to the federal alternative&#13;minimum tax. &lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund will not invest more than 10% of its net assets in&#13;obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For purposes of rating restrictions, if securities are rated&#13;differently by the rating agencies, the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least&#13;65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.&#13;&amp;#160;If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations&#13;issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and&#13;may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of&#13;any one issuer (such limitations do not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments&#13;(such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging&#13;purposes, to seek total return or as a substitute for the purchase or sale of securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;In pursuing its investment objective, the Fund normally acquires&#13;municipal obligations with maturities of ten years or more. The Fund&amp;#146;s portfolio often has a longer average maturity&#13;than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As a result, the interest rate risk described&#13;below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more of its total assets in certain types of&#13;municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one&#13;or more sectors (such as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The investment adviser&amp;#146;s process for selecting obligations&#13;for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative&#13;value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating&#13;agencies and generally performs additional credit and investment analysis. &amp;#160;The portfolio manager also may trade securities&#13;to seek to minimize taxable capital gains to shareholders. &amp;#160;A portion of the Fund&amp;#146;s distributions generally will be&#13;subject to the federal alternative minimum tax. &amp;#160;&lt;i&gt;The Fund may not be suitable for investors subject to the federal alternative&#13;minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk.&lt;i&gt; &lt;/i&gt;&amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether real&#13;or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Interest Rate Risk. &lt;font style="font-family: NewsGoth BT, Sans-Serif"&gt;&amp;#160;&lt;/font&gt;As&#13;interest rates rise, the value of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of&#13;Fund shares is likely to rise. &amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk&#13;because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.&#13;&amp;#160;In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay&#13;or &amp;#147;call&amp;#148; the obligation. &amp;#160;In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower&#13;yields. &amp;#160;Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby&#13;be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other&#13;circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead&#13;to defaults. Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security&#13;also may decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments.&#13;&amp;#160;In addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes.&#13;&amp;#160;Municipal obligations may be insured as to principal and interest payments. &amp;#160;If the claims-paying ability or other rating&#13;of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected. &amp;#160;In the case of&#13;an insured bond, the bond&amp;#146;s rating will be deemed to be the higher of the rating assigned to the bond&amp;#146;s issuer or the&#13;insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments.&lt;i&gt; &lt;/i&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated securities (&amp;#147; junk bonds &amp;#148;) have speculative characteristics because&#13;of the credit risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a&#13;greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers&#13;of higher rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment&#13;may lose significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility&#13;and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160;&lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160;&lt;/i&gt;The Fund may&#13;enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Sector and Geographic Concentration Risk. &amp;#160;Because the&#13;Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types&#13;of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation&#13;and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for&#13;state-specific economic information.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Risks of Principal Only Investments. &amp;#160;Principal only investments&#13;entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only investments&#13;are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently. &amp;#160;The&#13;Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may be required&#13;to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Issuer Diversification Risk. The Fund is &amp;#147;non-diversified&amp;#148;&#13;which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are &amp;#147;diversified.&amp;#148;&#13;&amp;#160;Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to&#13;risks affecting such issuers than a more diversified fund might be.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service,&#13;or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders&#13;subject to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks Associated with Active Management. &amp;#160;The Fund is&#13;an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160; In addition, the redemption by one or more large shareholders&#13;or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.&#13;&amp;#160; Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines&#13;in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person. &amp;#160;Mutual funds, investment advisers, other market participants&#13;and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes&#13;to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the&#13;Fund&amp;#146;s ability to execute its investment strategy.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk.&lt;i&gt; &lt;/i&gt;&amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether&#13;real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Interest Rate Risk. &lt;font style="font-family: NewsGoth BT, Sans-Serif"&gt;&amp;#160;&lt;/font&gt;As&#13;interest rates rise, the value of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of&#13;Fund shares is likely to rise. &amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk&#13;because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.&#13;&amp;#160;In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay&#13;or &amp;#147;call&amp;#148; the obligation. &amp;#160;In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower&#13;yields. &amp;#160;Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby&#13;be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other&#13;circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead&#13;to defaults. Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security&#13;also may decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments.&#13;&amp;#160;In addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes.&#13;&amp;#160;Municipal obligations may be insured as to principal and interest payments. &amp;#160;If the claims-paying ability or other rating&#13;of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected. &amp;#160;In the case of&#13;an insured bond, the bond&amp;#146;s rating will be deemed to be the higher of the rating assigned to the bond&amp;#146;s issuer or the&#13;insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments.&lt;i&gt; &lt;/i&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated securities (&amp;#147; junk bonds &amp;#148;) have speculative characteristics because&#13;of the credit risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a&#13;greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers&#13;of higher rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment&#13;may lose significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility&#13;and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160;&lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160;&lt;/i&gt;The Fund may&#13;enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Sector and Geographic Concentration Risk. &amp;#160;Because the&#13;Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types&#13;of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation&#13;and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for&#13;state-specific economic information.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks of Principal Only Investments. &amp;#160;Principal only&#13;investments entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only&#13;investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.&#13;&amp;#160;The Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may&#13;be required to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Issuer Diversification Risk. The Fund is &amp;#147;non-diversified&amp;#148;&#13;which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are &amp;#147;diversified.&amp;#148;&#13;&amp;#160;Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to&#13;risks affecting such issuers than a more diversified fund might be.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service,&#13;or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders&#13;subject to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Risks Associated with Active Management. &amp;#160;The Fund is an&#13;actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160;In addition, the redemption by one or more large shareholders or&#13;groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. &amp;#160;Investors&#13;in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment&#13;in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other&#13;government agency, entity or person. &amp;#160;Mutual funds, investment advisers, other market participants and many securities markets&#13;are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes to applicable rules and regulations&#13;could have an adverse affect on securities markets and market participants, as well as on the Fund&amp;#146;s ability to execute its&#13;investment strategy.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk.&lt;i&gt; &lt;/i&gt;&amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether&#13;real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Interest Rate Risk. &amp;#160;Fixed income securities will generally&#13;decline in value because of an increase in interest rates. &amp;#160;When the Fund&amp;#146;s average maturity is longer, the Fund will&#13;be more sensitive to changes in interest rates than when the Fund&amp;#146;s average maturity is shorter.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Duration Risk. &amp;#160;Duration measures the time-weighted expected&#13;cash flows of a fixed-income security, which can determine its sensitivity to changes in the general level of interest rates. Securities&#13;with longer durations tend to be more sensitive to interest rate changes than securities with shorter durations. A mutual fund&#13;with a longer dollar-weighted average duration can be expected to be more sensitive to interest rate changes than a fund with a&#13;shorter dollar-weighted average duration. Duration differs from maturity in that it considers a security&amp;#146;s coupon payments&#13;in addition to the amount of time until the security matures. Various techniques may be used to shorten or lengthen Fund duration.&#13;As the value of a security changes over time, so will its duration.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Maturity Risk. &amp;#160;Interest rate risk will generally affect&#13;the price of a fixed income security more if the security has a longer maturity. Fixed income securities with longer maturities&#13;will therefore be more volatile than other fixed income securities with shorter maturities. Conversely, fixed income securities&#13;with shorter maturities will be less volatile but generally provide lower returns than fixed income securities with longer maturities.&#13;The average maturity of the Fund&amp;#146;s investments will affect the volatility of the Fund&amp;#146;s share price.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other&#13;circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead&#13;to defaults. Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security&#13;also may decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments.&#13;&amp;#160;In addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes.&#13;&amp;#160;Municipal obligations may be insured as to principal and interest payments. &amp;#160;If the claims-paying ability or other rating&#13;of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected. &amp;#160;In the case of&#13;an insured bond, the bond&amp;#146;s rating will be deemed to be the higher of the rating assigned to the bond&amp;#146;s issuer or the&#13;insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160;&lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments.&lt;i&gt; &lt;/i&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated securities (&amp;#147; junk bonds &amp;#148;) have speculative characteristics because&#13;of the credit risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a&#13;greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers&#13;of higher rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment&#13;may lose significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility&#13;and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax-Sensitive Investing Risk. The Fund&amp;#146;s tax-sensitive&#13;strategy may cause the Fund to hold a security in order to achieve more favorable tax-treatment or to sell a security in order&#13;to create tax losses. The Fund&amp;#146;s ability to utilize various tax-management techniques may be curtailed or eliminated in the&#13;future by tax legislation or regulation. There can be no assurance that the Fund will be able to minimize taxable distributions&#13;to investors and a portion of the Fund&amp;#146;s distributions may be taxable.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160;&lt;/i&gt;The Fund may enter&#13;into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Sector Concentration Risk. &amp;#160;Because the Fund may concentrate&#13;its investments in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect&#13;that sector or type of obligation and may fluctuate more than that of a less concentrated fund.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks of Principal Only Investments. &amp;#160;Principal only&#13;investments entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only&#13;investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.&#13;&amp;#160;The Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may&#13;be required to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of U.S. Government-Sponsored Agencies. &amp;#160;Although&#13;certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage&#13;Association ) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S.&#13;Treasury.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service&amp;#160;or&#13;non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders subject to the federal&#13;alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks Associated with Active Management. &amp;#160;The Fund is&#13;an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160; In addition, the redemption by one or more large shareholders&#13;or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.&#13;&amp;#160; Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines&#13;in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person . &amp;#160;Mutual funds, investment advisers, other market participants&#13;and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes&#13;to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the&#13;Fund&amp;#146;s ability to execute its investment strategy .&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk.&lt;i&gt; &lt;/i&gt;&amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether&#13;real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Interest Rate Risk. &lt;font style="font-family: NewsGoth BT, Sans-Serif"&gt;&amp;#160;&lt;/font&gt;As&#13;interest rates rise, the value of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of&#13;Fund shares is likely to rise. &amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk&#13;because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.&#13;&amp;#160;In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay&#13;or &amp;#147;call&amp;#148; the obligation. &amp;#160;In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower&#13;yields. &amp;#160;Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby&#13;be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other circumstances&#13;may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults.&#13;Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security also may&#13;decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments. &amp;#160;In&#13;addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes. &amp;#160;Municipal&#13;obligations may be insured as to principal and interest payments. &amp;#160;If the claims-paying ability or other rating of the insurer&#13;is downgraded by a rating agency, the value of such obligations may be negatively affected. &amp;#160;In the case of an insured bond,&#13;the bond&amp;#146;s rating will be deemed to be the higher of the rating assigned to the bond&amp;#146;s issuer or the insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments.&lt;i&gt; &lt;/i&gt;&amp;#160; Investments&#13;rated below investment grade and comparable unrated securities (&amp;#147;junk bonds&amp;#148;) have speculative characteristics because&#13;of the credit risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a&#13;greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers&#13;of higher rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment&#13;may lose significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility&#13;and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160; &lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160; &lt;/i&gt;The Fund may&#13;enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Sector and Geographic Concentration Risk. &amp;#160;Because the&#13;Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types&#13;of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation&#13;and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for&#13;state-specific economic information.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks of Principal Only Investments. &amp;#160;Principal only&#13;investments entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only&#13;investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.&#13;&amp;#160;The Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may&#13;be required to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Issuer Diversification Risk. The Fund is &amp;#147;non-diversified&amp;#148;&#13;which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are &amp;#147;diversified.&amp;#148;&#13;&amp;#160;Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to&#13;risks affecting such issuers than a more diversified fund might be.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service,&#13;or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders&#13;subject to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Risks Associated with Active Management. &amp;#160;The Fund is an&#13;actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160;In addition, the redemption by one or more large shareholders or&#13;groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. &amp;#160;Investors&#13;in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment&#13;in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other&#13;government agency, entity or person. &amp;#160;Mutual funds, investment advisers, other market participants and many securities markets&#13;are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes to applicable rules and regulations&#13;could have an adverse affect on securities markets and market participants, as well as on the Fund&amp;#146;s ability to execute its&#13;investment strategy.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk. &amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether&#13;real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Interest Rate Risk. &lt;font style="font-family: NewsGoth BT, Sans-Serif"&gt;&amp;#160;&#13;&lt;/font&gt;As interest rates rise, the value of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the&#13;value of Fund shares is likely to rise. &amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater&#13;risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.&#13;&amp;#160;In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay&#13;or &amp;#147;call&amp;#148; the obligation. &amp;#160;In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower&#13;yields. &amp;#160;Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby&#13;be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other&#13;circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead&#13;to defaults. Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security&#13;also may decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments.&#13;&amp;#160;In addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes.&#13;&amp;#160;Municipal obligations may be insured as to principal and interest payments. &amp;#160;If the claims-paying ability or other rating&#13;of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected. &amp;#160;In the case of&#13;an insured bond, the bond&amp;#146;s rating will be deemed to be the higher of the rating assigned to the bond&amp;#146;s issuer or the&#13;insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments. &amp;#160;Investments rated below&#13;investment grade and comparable unrated securities (&amp;#147;junk bonds&amp;#148;) have speculative characteristics because of the credit&#13;risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a greater effect&#13;on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher&#13;rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose&#13;significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility and&#13;illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160;&lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160;&lt;/i&gt;The Fund may&#13;enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Sector and Geographic Concentration Risk. &amp;#160;Because the&#13;Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types&#13;of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation&#13;and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for&#13;state-specific economic information.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks of Principal Only Investments. &amp;#160;Principal only&#13;investments entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only&#13;investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.&#13;&amp;#160;The Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may&#13;be required to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Issuer Diversification Risk. The Fund is &amp;#147;non-diversified&amp;#148;&#13;which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are &amp;#147;diversified.&amp;#148;&#13;&amp;#160;Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to&#13;risks affecting such issuers than a more diversified fund might be.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service,&#13;or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders&#13;subject to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks Associated with Active Management. &amp;#160;The Fund is&#13;an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160; In addition, the redemption by one or more large shareholders&#13;or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.&#13;&amp;#160; Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines&#13;in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person . &amp;#160;Mutual funds, investment advisers, other market participants&#13;and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes&#13;to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the&#13;Fund&amp;#146;s ability to execute its investment strategy .&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal Bond Risk.&lt;i&gt; &lt;/i&gt;&amp;#160;The amount of public information&#13;available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance&#13;of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate&#13;bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other&#13;securities markets, which may limit an owner&amp;#146;s ability to sell its bonds at attractive prices. &amp;#160;The spread between the&#13;price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.&#13;&amp;#160;Less liquid obligations can become more difficult to value and be subject to erratic price movements. &amp;#160;The increased&#13;presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater&#13;volatility in the markets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Debt Market Risk. &amp;#160;Economic and other events (whether&#13;real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value&#13;of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. &amp;#160;Certain securities and other investments&#13;held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market&#13;may exceed the demand. &amp;#160;At other times, the demand for such instruments may exceed the supply in the market. &amp;#160;An imbalance&#13;in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading&#13;spreads and a lack of price transparency in the market. &amp;#160;No active trading market may exist for certain investments, which&#13;may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate&#13;such assets. Adverse market conditions may impair the liquidity of some actively traded investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Interest Rate Risk. &lt;font style="font-family: NewsGoth BT, Sans-Serif"&gt;&amp;#160;&lt;/font&gt;As&#13;interest rates rise, the value of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of&#13;Fund shares is likely to rise. &amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk&#13;because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.&#13;&amp;#160;In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay&#13;or &amp;#147;call&amp;#148; the obligation. &amp;#160;In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower&#13;yields. &amp;#160;Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby&#13;be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Credit Risk. &amp;#160;Changes in economic conditions or other circumstances&#13;may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults.&#13;Such defaults may reduce the value of Fund shares and income distributions. &amp;#160;The value of a fixed income security also may&#13;decline because of real or perceived concerns about the issuer&amp;#146;s ability to make principal and interest payments. &amp;#160;In&#13;addition, the credit rating of securities held by the Fund may be lowered if an issuer&amp;#146;s financial condition changes. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Municipal obligations may be insured as to principal and interest&#13;payments. &amp;#160;If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such&#13;obligations may be negatively affected. &amp;#160;In the case of an insured bond, the bond&amp;#146;s rating will be deemed to be the&#13;higher of the rating assigned to the bond&amp;#146;s issuer or the insurer.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Lower Rated Investments.&lt;i&gt; &lt;/i&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated securities (&amp;#147; junk bonds &amp;#148;) have speculative characteristics because&#13;of the credit risk associated with their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a&#13;greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers&#13;of higher rated investments. &amp;#160;An economic downturn generally leads to a higher non-payment rate, and a lower rated investment&#13;may lose significant value before a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility&#13;and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Derivatives Risk. &lt;i&gt;&amp;#160;&lt;/i&gt;The use of derivatives can&#13;lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative,&#13;due to failure of a counterparty or due to tax or regulatory constraints. &amp;#160;Derivatives may create economic leverage in the&#13;Fund, which magnifies the Fund&amp;#146;s exposure to the underlying investment. Derivatives risk may be more significant when derivatives&#13;are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position&#13;held by the Fund. &amp;#160;When derivatives are used to gain or limit exposure to a particular market or market segment, their performance&#13;may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose&#13;for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill&#13;and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. &amp;#160;Derivative&#13;instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the&#13;value of the underlying instrument. &amp;#160;If a derivative&amp;#146;s counterparty is unable to honor its commitments, the value of&#13;Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.&#13;&amp;#160;The loss on derivative transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Leveraged Transactions. &amp;#160;Certain Fund transactions&#13;may give rise to a form of leverage. &amp;#160;Such transactions may include, among others, the use of when-issued, delayed delivery&#13;or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions. &amp;#160;The Fund is&#13;required to segregate liquid assets or otherwise cover the Fund&amp;#146;s obligation created by a transaction that may give rise&#13;to leverage. &amp;#160;The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do&#13;so to satisfy its obligations or to meet segregation requirements. &amp;#160;Leverage may cause the Fund to be more volatile than if&#13;it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the&#13;Fund&amp;#146;s portfolio securities. &amp;#160;The loss on leveraged transactions may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risk of Residual Interest Bonds. &lt;i&gt;&amp;#160;&lt;/i&gt;The Fund may&#13;enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate&#13;municipal bond. &amp;#160;The interest payments that the Fund receives on the residual interest bonds acquired in such transactions&#13;vary inversely with short-term interest rates, normally decreasing when short-term rates increase. &amp;#160;The value and market for&#13;residual interest bonds are volatile and such bonds may have limited liquidity. &amp;#160;As required by applicable accounting standards,&#13;the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income&#13;in an amount equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Sector and Geographic Concentration Risk. &amp;#160;Because the&#13;Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types&#13;of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation&#13;and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for&#13;state-specific economic information.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks of Principal Only Investments. &amp;#160;Principal only&#13;investments entitle the holder to receive par value of such investment if held to maturity. &amp;#160;The values of principal only&#13;investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.&#13;&amp;#160;The Fund will accrue income on these investments and is required to distribute that income each year. &amp;#160;The Fund may&#13;be required to sell securities to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Issuer Diversification Risk. The Fund is &amp;#147;non-diversified&amp;#148;&#13;which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are &amp;#147;diversified.&amp;#148;&#13;&amp;#160;Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to&#13;risks affecting such issuers than a more diversified fund might be.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Tax Risk. &amp;#160;Income from tax-exempt municipal obligations&#13;could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service,&#13;or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund&amp;#146;s income may be taxable to shareholders&#13;subject to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Risks Associated with Active Management. &amp;#160;The Fund is&#13;an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser&#13;to develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;General Fund Investing Risks. &amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund. &amp;#160;All investments carry a certain amount of risk and there&#13;is no guarantee that the Fund will be able to achieve its investment objective. &amp;#160;Annual Fund Operating Expenses expressed&#13;as a percentage of the Fund&amp;#146;s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating&#13;Expenses may differ in the future. &amp;#160;Purchase and redemption activities by Fund shareholders may impact the management of the&#13;Fund and its ability to achieve its investment objective. &amp;#160;In addition, the redemption by one or more large shareholders or&#13;groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. &amp;#160;&#13;Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value.&#13;An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation&#13;or any other government agency, entity or person. &amp;#160;Mutual funds, investment advisers, other market participants and many securities&#13;markets are subject to rules and regulations and the jurisdiction of one or more regulators.&amp;#160; Changes to applicable rules&#13;and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund&amp;#146;s ability&#13;to execute its investment strategy.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &amp;#160;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower. &amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com. &amp;#160;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &amp;#160;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be lower.&#13;&amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated Fund performance information&#13;can be obtained by visiting www.eatonvance.com.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt Sans-Serif; margin: 2.8pt 0; color: Red"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Performance history will be available for the Fund after the&#13;Fund has been in operation for one full calendar year.&lt;/p&gt;&#13;&#13;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &amp;#160;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be lower.&#13;&amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated Fund performance information&#13;can be obtained by visiting www.eatonvance.com.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt Sans-Serif; margin: 2.8pt 0; color: Red"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &amp;#160;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be lower.&#13;&amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated Fund performance information&#13;can be obtained by visiting www.eatonvance.com.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt Sans-Serif; margin: 2.8pt 0; color: Red"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &amp;#160;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be lower.&#13;&amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated Fund performance information&#13;can be obtained by visiting www.eatonvance.com.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt Sans-Serif; margin: 2.8pt 0; color: Red"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
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    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 12pt 0 0"&gt;Annual Fund Operating Expenses&lt;sup&gt; &lt;/sup&gt;(expenses&#13;that you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
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    <rr:BarChartClosingTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was 9. 41 % for the quarter ended September 30, 2009, and the lowest quarterly return was &amp;#150;7. 54&#13;% for the quarter ended December 31, 2008. &amp;#160;The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2011 to September 30, 2012 ) was 7.32 %. &amp;#160;For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were 2.36 % and 3.80 %, respectively,&#13;for Class B shares were 1.74 % and 2.80 %, respectively, for Class C shares were 1.74 % and 2.80 %, respectively , and for Class&#13;I shares were 2.68 % and 4.32 %, respectively. &amp;#160;A lower tax rate would result in lower tax-equivalent yields. &amp;#160;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2011 , the highest&#13;quarterly total return for Class A was 8. 56 % for the quarter ended September 30, 2009, and the lowest quarterly return was &amp;#150;5.&#13;52 % for the quarter ended December 31, 2008. &amp;#160;The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2011 to September 30, 2012 ) was 6.35%. &amp;#160;For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were 2.23 % and 3.68 %, respectively,&#13;for Class B shares were 1.61 % and 2.66 %, respectively, for Class C shares were 1.61 % and 2.66 %, respectively, and for Class&#13;I shares were 2.54 % and 4.19 %, respectively. &amp;#160;A lower tax rate would result in lower tax-equivalent yields. &amp;#160;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2011, the highest&#13;quarterly total return for Class A was 12.85% for the quarter ended September 30, 2009, and the lowest quarterly return was &amp;#150;15.29%&#13;for the quarter ended December 31, 2008. &amp;#160;The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2011 to September 30, 2012) was 10.32%. &amp;#160;&amp;#160;For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were 2.86% and 4.83%, respectively,&#13;for Class C shares were 2.26% and 3.82%, respectively, and for Class I shares were 3.20% and 5.41%, respectively. &amp;#160;A lower&#13;tax rate would result in lower tax-equivalent yields. &amp;#160;For current yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;During the ten years ended December 31, 2011 , the highest&#13;quarterly total return for Class A was 12.61 % for the quarter ended March 31, 2009, and the lowest quarterly return was &amp;#150;12.&#13;61 % for the quarter ended December 31, 2008. &amp;#160;The year-to-date total return through the end of the most recent calendar&#13;quarter (December 31, 2011 to September 30, 2012 ) was 7.50 %. &amp;#160;&amp;#160;For the 30 days ended July 31, 2012 , the SEC yield&#13;and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were 2.62 %&#13;and 4.16 %, respectively, for Class B shares were 2.01 % and 3.19 %, respectively, for Class C shares were 2.01 % and 3.19%, respectively,&#13;and for Class I shares were 2.95 % and 4.68 %, respectively. &amp;#160;A lower tax rate would result in lower tax-equivalent yields.&#13;&amp;#160;For current yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2011, the highest&#13;quarterly total return for Class A was 8. 23 % for the quarter ended March 31, 2009, and the lowest quarterly return was &amp;#150;6.&#13;19 % for the quarter ended September 30, 2008. &amp;#160;The year-to-date total return through the end of the most recent calendar&#13;quarter (December 31, 2011 to September 30, 2012 ) was 6.62%. &amp;#160;For the 30 days ended July 31, 2012 , the SEC yield and SEC&#13;tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were 1.92 % and 3.21&#13;%, respectively, for Class B shares were 1.28 % and 2.14 %, respectively, for Class C shares were 1.28 % and 2.14 %, respectively&#13;, and for Class I shares were 2.21 % and 3.69 %, respectively. &amp;#160;A lower tax rate would result in lower tax-equivalent yields.&#13;&amp;#160;For current yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
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    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &amp;#160;The Class C performance&#13;shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. &amp;#160;If adjusted&#13;for other expenses, returns would be different. &amp;#160;Investors cannot invest directly in an Index. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &amp;#160;The Class C performance&#13;shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. If adjusted for&#13;other expenses, returns would be different. &amp;#160;Investors cannot invest directly in an Index. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class C. &amp;#160;The Class C performance shown&#13;above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since&#13;converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other&#13;differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement&#13;of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of&#13;the two classes. &amp;#160;If adjusted for other expenses, returns would be different. &amp;#160;Investors cannot invest directly in an&#13;Index. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &amp;#160;The Class C performance&#13;shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. &amp;#160;If adjusted&#13;for other expenses, returns would be different. &amp;#160;Investors cannot invest directly in an Index. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &amp;#160;The Class C performance&#13;shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. &amp;#160;If adjusted&#13;for other expenses, returns would be different. &amp;#160;Investors cannot invest directly in an Index. &amp;#160;&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004862Member_C000013172Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000032714Member_C000100969Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000032714Member_C000100971Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004862Member_C000013172Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000032714Member_C000100969Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000032714Member_C000100971Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0.0033</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0.0033</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0033</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0.0033</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0.0037</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0.0037</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000013172Member" unitRef="Ratio" decimals="INF">0.0037</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0.0037</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000032714Member_C000100969Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000032714Member_C000100971Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0.0041</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0.0035</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0.0035</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0.0035</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0.0035</rr:ManagementFeesOverAssets>
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    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0.0020</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
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    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000032714Member_C000100969Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000032714Member_C000100971Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0.0020</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0.0020</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0.0020</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0.0095</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:Component1OtherExpensesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0.0002</rr:Component1OtherExpensesOverAssets>
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    <rr:Component1OtherExpensesOverAssets contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0002</rr:Component1OtherExpensesOverAssets>
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    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;You may qualify for a reduced sales charge if you invest, or agree to invest over&#13;a 13-month period, at least $50,000 in Eaton Vance Funds. &amp;#160;More information about these and other discounts is available from&#13;your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000004849Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000004862Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000032714Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000004847Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000004853Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount contextRef="AsOf2012-12-01_S000004843Member" unitRef="USD" decimals="0">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000004849Member">Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions , if securities are rated differently by the rating agencies&#13;, the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the &amp;#147;80%&#13;Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the interest from which is subject to the federal alternative&#13;minimum tax. &amp;#160;The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality.&#13;The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (&amp;#147;junk bonds&amp;#148;). &amp;#160;Below&#13;investment grade obligations are those obligations rated below Baa by Moody&amp;#146;s Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;),&#13;or below BBB by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;) or Fitch Ratings (&amp;#147;Fitch&amp;#148;).&#13;&amp;#160;For the purposes of rating restrictions, the higher rating is used. &amp;#160;The Fund may invest up to 20% of its net assets&#13;in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations&#13;of the U.S. Government, its agencies and instrumentalities (&amp;#147;Agency Securities&amp;#148;). &amp;#160;&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;). The Fund will not invest&#13;more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by&#13;the investment adviser. &amp;#160;For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160;Under normal market conditions, the Fund invests at least 65% of its total assets in obligations&#13;issued by its state or its political subdivisions, agencies, authorities and instrumentalities. &amp;#160;If consistent with relevant&#13;state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto&#13;Rico, the U.S. Virgin Islands and Guam. &amp;#160;The Fund is &amp;#147;non-diversified&amp;#148; and may invest, with respect to 50% of&#13;its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do&#13;not apply to U.S. Government securities). &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest&#13;bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total&#13;return or as a substitute for the purchase or sale of securities.&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;Under normal market circumstances, the Fund invests at least&#13;80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in&#13;the Fund&amp;#146;s investment objective (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund may invest without limit in obligations the&#13;income from which is subject to the federal alternative minimum tax. &amp;#160;At least 75% of net assets normally will be invested&#13;in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;)&#13;or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by the investment adviser to be of at least investment grade&#13;quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser (&amp;#147;junk bonds&amp;#148;).&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000004849Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000004862Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000032714Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000004847Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000004853Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2012-12-01_S000004843Member">The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000004849Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000004862Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000032714Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000004847Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000004853Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2012-12-01_S000004843Member">An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance&#13;Corporation or any other government agency, entity or person.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The following bar chart and table provide some indication&#13;of the risks of investing in the Fund by showing changes in the Fund&amp;#146;s performance from year to year and how the Fund&amp;#146;s&#13;average annual returns over time compare with those of two broad-based securities market indices. &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The returns in the bar&#13;chart are for Class A shares and do not reflect a sales charge. &amp;#160;If the sales charge was reflected, the returns would be&#13;lower.&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Past performance (both before and after taxes) is no guarantee of future results. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000032714Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;For current&#13;yield information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class A&#13;(4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The Class C performance&#13;shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.&lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The Class C performance&#13;shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.&lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The Class C performance shown&#13;above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since&#13;converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other&#13;differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement&#13;of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of&#13;the two classes. &lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The Class C performance&#13;shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. &lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;The Class C performance&#13;shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted&#13;for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes)&#13;and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance&#13;of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. &lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns are calculated using the highest historical&#13;individual federal income tax rate and do not reflect the impact of state and local taxes. &amp;#160;Actual after-tax returns depend&#13;on a shareholder&amp;#146;s tax situation and the actual characterization of distributions, and may differ from those shown. &amp;#160;&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;&amp;#160;&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return&#13;After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions&#13;were made during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater&#13;than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was &lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was &lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was &lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was &lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;During the ten years ended December 31, 2011 , the highest quarterly&#13;total return for Class A was &lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004849Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004862Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004847Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004853Member">2009-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004843Member">2009-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2012-12-01_S000004849Member" unitRef="Ratio" decimals="INF">0.0941</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2012-12-01_S000004862Member" unitRef="Ratio" decimals="INF">0.0856</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2012-12-01_S000004847Member" unitRef="Ratio" decimals="INF">0.1285</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2012-12-01_S000004853Member" unitRef="Ratio" decimals="INF">0.1261</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2012-12-01_S000004843Member" unitRef="Ratio" decimals="INF">0.0823</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004849Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004862Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004847Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004853Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2012-12-01_S000004843Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2012-12-01_S000004849Member" unitRef="Ratio" decimals="INF">-0.0754</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2012-12-01_S000004862Member" unitRef="Ratio" decimals="INF">-0.0552</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2012-12-01_S000004847Member" unitRef="Ratio" decimals="INF">-0.1529</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2012-12-01_S000004853Member" unitRef="Ratio" decimals="INF">-0.1261</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2012-12-01_S000004843Member" unitRef="Ratio" decimals="INF">-0.0619</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004849Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004862Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004847Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004853Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2012-12-01_S000004843Member">2008-09-30</rr:BarChartLowestQuarterlyReturnDate>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004849Member_C000013133Member">ETAZX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004849Member_C000013134Member">EVAZX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004849Member_C000013135Member">ECAZX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004849Member_C000092720Member">EIAZX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004862Member_C000013173Member">ETCTX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004862Member_C000013174Member">EVCTX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004862Member_C000013172Member">ECCTX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004862Member_C000063955Member">EICTX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000032714Member_C000100969Member">EMOAX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000032714Member_C000100971Member">EMOIX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004847Member_C000013127Member">ETNJX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004847Member_C000013129Member">ECNJX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004847Member_C000063948Member">EINJX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004853Member_C000013145Member">ETPAX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004853Member_C000013146Member">EVPAX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004853Member_C000013147Member">ECPAX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004853Member_C000063951Member">EIPAX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004843Member_C000013114Member">ETMNX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004843Member_C000013115Member">EVMNX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004843Member_C000013116Member">ECMNX</dei:TradingSymbol>
    <dei:TradingSymbol contextRef="AsOf2012-12-01_S000004843Member_C000092718Member">EIMNX</dei:TradingSymbol>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004849Member_C000013133Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004849Member_C000013134Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class B shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004849Member_C000013135Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class C shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004849Member_C000092720Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and for Class&#13;I shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004862Member_C000013173Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were &lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004862Member_C000013174Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class B shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004862Member_C000013172Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class C shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004862Member_C000063955Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and for Class&#13;I shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004847Member_C000013127Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent&#13;yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were &lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004847Member_C000013129Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class C shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004847Member_C000063948Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and for Class I shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004853Member_C000013145Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;For the 30 days ended July 31, 2012 , the SEC yield and SEC&#13;tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were &lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004853Member_C000013146Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class B shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004853Member_C000013147Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class C shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004853Member_C000063951Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and for Class&#13;I shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004843Member_C000013114Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;For the 30 days ended July 31, 2012 , the SEC yield and SEC&#13;tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were &lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004843Member_C000013115Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class B shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004843Member_C000013116Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;for Class C shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYieldColumnName contextRef="AsOf2012-12-01_S000004843Member_C000092718Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt"&gt;and for Class&#13;I shares were&lt;/p&gt;</rr:ThirtyDayYieldColumnName>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0.0236</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0.0174</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0174</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0.0286</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0.0223</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0.0161</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004862Member_C000013172Member" unitRef="Ratio" decimals="INF">0.0161</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0.0254</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0.0286</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0.0226</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0.0320</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0.0262</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0.0201</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0.0201</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0.0295</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0.0192</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0.0128</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0.0128</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0.0221</rr:ThirtyDayYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004849Member_C000013133Member" unitRef="Ratio" decimals="INF">0.0380</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004849Member_C000013134Member" unitRef="Ratio" decimals="INF">0.0280</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004849Member_C000013135Member" unitRef="Ratio" decimals="INF">0.0280</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004849Member_C000092720Member" unitRef="Ratio" decimals="INF">0.0432</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004862Member_C000013173Member" unitRef="Ratio" decimals="INF">0.0368</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004862Member_C000013174Member" unitRef="Ratio" decimals="INF">0.0266</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004862Member_C000013172Member" unitRef="Ratio" decimals="INF">0.0266</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004862Member_C000063955Member" unitRef="Ratio" decimals="INF">0.0419</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004847Member_C000013127Member" unitRef="Ratio" decimals="INF">0.0483</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004847Member_C000013129Member" unitRef="Ratio" decimals="INF">0.0382</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004847Member_C000063948Member" unitRef="Ratio" decimals="INF">0.0541</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004853Member_C000013145Member" unitRef="Ratio" decimals="INF">0.0416</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004853Member_C000013146Member" unitRef="Ratio" decimals="INF">0.0319</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004853Member_C000013147Member" unitRef="Ratio" decimals="INF">0.0319</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004853Member_C000063951Member" unitRef="Ratio" decimals="INF">0.0468</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004843Member_C000013114Member" unitRef="Ratio" decimals="INF">0.0321</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004843Member_C000013115Member" unitRef="Ratio" decimals="INF">0.0214</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004843Member_C000013116Member" unitRef="Ratio" decimals="INF">0.0214</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2012-12-01_S000004843Member_C000092718Member" unitRef="Ratio" decimals="INF">0.0369</rr:ThirtyDayTaxEquivalentYield>
    <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
      <link:loc xlink:type="locator" xlink:href="#Foot-00-0" xlink:label="Foot-00_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-00-1" xlink:label="Foot-00_loc" />
      <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Foot-00_loc" xlink:to="Footnote-01" order="1" />
      <link:footnote xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:label="Footnote-01" xml:lang="en-US">The investment adviser and administrator have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.10% for Class A shares and 0.85% for Class I shares . This expense reimbursement will continue through November 30, 2013 . Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses, interest expense , taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the Fund's current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.</link:footnote>
    </link:footnoteLink>
</xbrli:xbrl>
