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    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2013-01-28_S000005300Member_BarclaysCapitalLong22PlusMunicipalBondIndexMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:ObjectiveHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Investment Objectives&lt;/p&gt;</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Investment Objective&lt;/p&gt;</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Investment Objective&lt;/p&gt;</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund&amp;#146;s primary investment objective is current income&#13;and its secondary investment objective is capital appreciation.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund&amp;#146;s investment objective is to seek total return.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund&amp;#146;s investment objective is to provide current&#13;income exempt from regular federal income tax.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Fees and Expenses of the Fund&lt;/p&gt;</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Fees and Expenses of the Fund&lt;/p&gt;</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Fees and Expenses of the Fund&lt;/p&gt;</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2013-01-28_S000026932Member">&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 13 of this Prospectus and page 19 of the Fund&amp;#146;s Statement&#13;of Additional Information. &amp;#160;&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2013-01-28_S000005280Member">&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 28 of this Prospectus and page 22 of the Fund&amp;#146;s Statement&#13;of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2013-01-28_S000005300Member">&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>
    <rr:ShareholderFeesTableTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ShareholderFeesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000026932Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
    <rr:ShareholderFeesTableTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ShareholderFeesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000005280Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
    <rr:ShareholderFeesTableTextBlock contextRef="AsOf2013-01-28_S000005300Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ShareholderFeesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000005300Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
    <rr:ExpenseExampleHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Example.&lt;/p&gt;</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2013-01-28_S000005280Member">&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="AsOf2013-01-28_S000005300Member">&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="AsOf2013-01-28_S000026932Member">&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="AsOf2013-01-28_S000005280Member">&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="AsOf2013-01-28_S000005300Member">&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:ExpenseExampleWithRedemptionTableTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ExpenseExample column period compact * column dei_LegalEntityAxis compact EVMFT_S000026932Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
    <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ExpenseExample column period compact * column dei_LegalEntityAxis compact EVMFT_S000005280Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
    <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="AsOf2013-01-28_S000005300Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/ExpenseExample column period compact * column dei_LegalEntityAxis compact EVMFT_S000005300Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2013-01-28_S000026932Member">&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 was 24 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2013-01-28_S000005280Member">&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 50 % of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2013-01-28_S000005300Member">&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 26% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:StrategyHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Investment Strategies&lt;/p&gt;</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2013-01-28_S000026932Member">&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 taxable municipal obligations issued pursuant to the American Recovery and Reinvestment Act of 2009 (the&#13;&amp;#147;Act&amp;#148;) or other legislation providing for the issuance of taxable municipal debt on which the issuer receives federal&#13;support (any bonds so issued considered &amp;#147;Build America Bonds&amp;#148;) (the &amp;#147;80% Policy&amp;#148;). &amp;#160;Unlike most other&#13;municipal obligations, interest received on Build America Bonds is subject to federal income tax and may be subject to state income&#13;tax. &amp;#160;Under the terms of the Act, issuers of &amp;#147;direct pay&amp;#148; Build America Bonds are entitled to receive reimbursement&#13;from the U.S. Treasury currently equal to 35% (or 45% in the case of Recovery Zone Economic Development Bonds) of the interest&#13;paid on the bonds. &amp;#160;Holders of &amp;#147;tax credit&amp;#148; Build America Bonds receive a federal tax credit currently equal to&#13;35% of the coupon interest received. &amp;#160;The Fund expects to invest primarily in direct pay Build America Bonds and &amp;#147;principal&#13;only&amp;#148; strips of tax credit Build America Bonds. &amp;#160;The Fund does not expect to receive (or pass through to shareholders)&#13;tax credits as a result of its investments. &amp;#160;Provisions of the Act relevant to the issuance of Build America Bonds expired&#13;on December 31, 2010 and, as such, issuance has ceased. &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 invest up to 20% of its net assets in debt obligations&#13;other than Build America Bonds, including (but not limited to) taxable municipal obligations that do not qualify for federal support,&#13;U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities (&amp;#147;Agency Securities&amp;#148;).&#13;&amp;#160;At least 65% of net assets normally will be invested in obligations that, at time of purchase, are rated A or better by Moody&amp;#146;s&#13;Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), Standard &amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;) or Fitch&#13;Ratings (&amp;#147;Fitch&amp;#148;) or, if unrated, are determined by the investment adviser to be of comparable quality. The balance&#13;of net assets may be invested in obligations rated BBB/Baa or below and in unrated municipal obligations considered by the investment&#13;adviser to be of comparable quality. &amp;#160;The Fund will not invest more than 10% of its net assets in obligations rated below&#13;B by Moody&amp;#146;s, S&amp;#38;P or Fitch at the time of investment, or unrated obligations considered by the investment adviser to&#13;be of comparable quality. &amp;#160; For purposes of rating restrictions, if securities are rated differently by the rating agencies,&#13;the higher rating is used. &amp;#160; The Fund may invest 25% or more of its total assets in certain types of municipal obligations&#13;(such as general obligations, revenue bonds and bonds relating to infrastructure financings) and also may concentrate in municipal&#13;obligations in a particular economic sector (which may include public utilities, public education facilities, public transportation&#13;and public housing).&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 financial futures contracts&#13;and options thereon to hedge against changes in interest rates or as a substitute for the purchase of portfolio securities. The&#13;Fund also may enter into interest rate swaps, forward rate contracts and credit derivatives, which may include credit default swaps,&#13;total return swaps or credit options, as well as purchase an instrument that has greater or lesser credit risk than the municipal&#13;bonds underlying the instrument.&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 entity 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;Although the investment adviser considers&#13;ratings when making investment decisions, with respect to lower rated securities it performs its own credit analysis and does not&#13;rely exclusively on the ratings assigned by the rating services.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Under normal circumstances, the Fund invests primarily in&#13;equity securities. &amp;#160;Although the Fund can invest in equity securities of any size, it intends to focus its investments on&#13;mid-cap companies. &amp;#160;Mid-Cap companies are companies with market capitalizations within the range of capitalizations of companies&#13;included in the Russell Midcap Growth Index. &amp;#160;Although it invests primarily in U.S. traded securities (including depositary&#13;receipts evidencing ownership in underlying foreign stocks), the Fund may invest up to 25% of its total assets in foreign securities&#13;, including those trading in developed and emerging international markets. &amp;#160;The Fund may invest no more than 5% of its net&#13;assets in real estate investment trusts. &amp;#160;The Fund may also lend its securities.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The Fund may engage in derivative transactions to seek return,&#13;to hedge against fluctuations in securities prices, interest rates or currency exchange rates, or as a substitute for the purchase&#13;or sale of securities or currencies. &amp;#160;The Fund expects to use derivatives principally by writing covered call options to generate&#13;income or to use as a hedging technique. &amp;#160;Permitted derivatives include: the purchase or sale of forward or futures contracts;&#13;options on futures contracts; exchange-traded and over-the-counter options; equity collars and equity swap agreements. &amp;#160;There&#13;is no stated limit on the Fund&amp;#146;s use of derivatives. &amp;#160;The Fund may also engage in covered short sales (on individual&#13;securities held or on an index or basket of securities whose constituents are held in whole or in part or for which liquid assets&#13;have been segregated).&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;The portfolio managers seek to invest in quality growth companies&#13;with a demonstrated history of consistent growth and stability in earnings that management believes are attractively valued relative&#13;to earnings and cash flow per share. &amp;#160;Financial quality is determined by analysis of a company&amp;#146;s financial statements&#13;and is measured by a company&amp;#146;s demonstrated ability to consistently grow earnings. &amp;#160;The portfolio managers typically&#13;favor companies that they believe have sustainable above-average earnings growth potential and whose underlying financial prospects&#13;are exceeding consensus expectations. &amp;#160;Sustainable earnings growth potential is determined by rigorous fundamental analysis&#13;of a company&amp;#146;s financial trends; products and services; industry conditions; and other factors. &amp;#160;The portfolio managers&#13;may utilize &amp;#147;financial quality rankings&amp;#148; provided by nationally recognized rating services as part of their investment&#13;analysis but do not rely solely upon such rankings in making investment decisions . &amp;#160;The portfolio managers seek to manage&#13;individual security risk through analysis of each security&amp;#146;s risk/reward characteristics.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Portfolio securities are selected by the portfolio managers&#13;in consultation with a team of investment analysts in the investment sub- adviser&amp;#146;s equity research group . &amp;#160;Each analyst&#13;maintains research responsibility for investments in his or her area of coverage. &amp;#160;Allocations among market sectors are determined&#13;by the portfolio managers in consultation with the analysts, using the market sector weights of the Russell Midcap Growth Index&#13;as a benchmark. &amp;#160;Stocks are added to the portfolio based on factors which may include: &amp;#160;the relative attractiveness of&#13;the risk/reward profile; earnings consistency; expected rate of sustainable earnings growth; and prospects for near-term accelerating&#13;earnings growth. &amp;#160;The portfolio managers may sell a security when its fundamentals deteriorate, when its valuation is no longer&#13;attractive relative to its long-term growth rate or when other securities are indentified to displace a current holding .&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2013-01-28_S000005300Member">&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 obligations (including notes and tax-exempt commercial paper) issued by or on behalf of states, territories&#13;and possessions of the United States and the District of Columbia and their political subdivisions, agencies or instrumentalities,&#13;the interest on which is exempt from regular federal income tax (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund will not invest&#13;in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. &amp;#160;At least 65% of net&#13;assets will normally be invested in municipal obligations rated at least investment grade at the time of investment (which are&#13;those rated Baa or higher by Moody&amp;#146;s Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard&#13;&amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;) or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by&#13;the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations&#13;rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser&#13;(&amp;#147;junk bonds&amp;#148;). &amp;#160;The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated&#13;obligations considered to be of comparable quality by the investment adviser. &amp;#160;For purposes of rating restrictions, if securities&#13;are rated differently by the rating agencies, the higher rating is used. &amp;#160;The Fund may invest in securities in any rating&#13;category, including those in default. &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest bonds,&#13;futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return&#13;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 objective, the Fund normally acquires municipal&#13;obligations with maturities of ten years or more, but may acquire securities with shorter maturities. &amp;#160;The Fund&amp;#146;s portfolio&#13;often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations. &amp;#160;As&#13;a result, the interest rate risk described below may be more significant for the Fund. &amp;#160;The Fund may concentrate 25% or more&#13;of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and&#13;industrial development bonds) and in one 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. &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 manager also may trade&#13;securities to minimize taxable capital gains to shareholders.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Principal Risks&lt;/p&gt;</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2013-01-28_S000026932Member">&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;Because issuance of Build America Bonds ceased on December 31, 2010, it is difficult to predict the extent to which a market&#13;for such bonds will continue, meaning that Build America Bonds may experience greater illiquidity than other municipal obligations.&#13;&amp;#160;In addition, municipal obligations can experience downturns in trading activity and the supply of municipal obligations may&#13;exceed the demand in the market or demand can exceed supply. &amp;#160;During such periods, the spread can widen between the price&#13;at which an obligation can be purchased and the price at which it can be sold. &amp;#160;Less liquid obligations can become more difficult&#13;to value and be subject to erratic price movements. &amp;#160;The increased presence of non-traditional participants or the absence&#13;of traditional participants in the municipal markets may lead to greater 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;As interest rates rise, the value&#13;of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of Fund shares is likely to rise.&#13;&amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations&#13;are more sensitive to changes in interest rates than obligations with shorter maturities. &amp;#160;In a declining interest rate environment,&#13;prepayments of obligations may increase if the issuer has the ability to pre-pay or &amp;#147;call&amp;#148; the obligation. &amp;#160;In&#13;such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.&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 BBB/Baa and comparable unrated securities have speculative characteristics because of the credit risk associated with&#13;their issuers. &amp;#160;Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers&#13;of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. &amp;#160;An&#13;economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before&#13;a default occurs. &amp;#160;Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated&#13;investments.&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;Risk Associated with Limited Issuance. &amp;#160;Under the Act&#13;the ability of municipalities to issue Build America Bonds expired on December 31, 2010 and there can be no certainty as to whether&#13;future legislation will be enacted that would again permit such issuance. &amp;#160;Since the enactment of the Act, approximately $180&#13;billion in Build America Bonds has been issued by municipalities. &amp;#160;Given the limited issuance of Build America Bonds, they&#13;may not be actively traded. &amp;#160;In addition, illiquidity may negatively affect the value of the bonds.&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;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 objectives. &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 objectives. &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 objectives. &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="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Equity Investing Risk. The Fund&amp;#146;s shares are sensitive&#13;to stock market volatility and the stocks in which the Fund invests may be more volatile than the stock market as a whole. &amp;#160;The&#13;prices of stocks may decline in response to conditions affecting the general economy; overall market changes; local, regional or&#13;global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer&#13;or sector specific events. &amp;#160;Market conditions may affect certain types of stocks (such as mid-cap or growth stocks) to a greater&#13;extent than other types of stocks. &amp;#160;If the stock market declines, the value of Fund shares will also likely decline and, although&#13;stock values can rebound, there is no assurance that values will return to previous levels.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Smaller Company Equity Risk.&lt;font style="font-family: Arial, Helvetica, Sans-Serif"&gt;&amp;#8194;&lt;/font&gt;The&#13;stocks of smaller, less seasoned companies are generally subject to greater price fluctuations, limited liquidity, higher transaction&#13;costs and higher investment risk. &amp;#160;Smaller companies may have limited product lines, markets or financial resources, may be&#13;dependent on a limited management group, and may lack substantial capital reserves or an established performance record. &amp;#160;There&#13;may be generally less publicly available information about such companies than for larger, more established companies.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Foreign and Emerging Market Investment Risk.&lt;font style="font-family: Arial, Helvetica, Sans-Serif"&gt;&amp;#8194;&lt;/font&gt;Because&#13;the Fund can invest a portion of its assets in foreign instruments, the value of Fund shares can be adversely affected by changes&#13;in currency exchange rates and political, economic and market developments abroad. &amp;#160;In emerging or less developed countries,&#13;these risks can be more significant. &amp;#160;Investment markets in emerging market countries are typically substantially smaller,&#13;less liquid and more volatile than the major markets in developed countries. &amp;#160;As a result, Fund share values may be more volatile&#13;than if the Fund invested only in developed markets. &amp;#160;Emerging market countries may have relatively unstable governments and&#13;economies. &amp;#160;Emerging market investments often are subject to speculative trading, which typically contributes to volatility.&#13;&amp;#160;Trading in foreign and emerging markets typically involves higher expense than trading in the United States. The Fund may&#13;have difficulties enforcing its legal or contractual rights in a foreign country. The value of investments denominated in foreign&#13;currencies can be adversely affected by changes in foreign currency exchange rates. Depositary receipts are subject to many of&#13;the risks associated with investing in foreign securities including political, economic and market risks.&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;Securities Lending Risk. &amp;#160;Securities lending involves&#13;possible delay in recovery of the securities or possible loss of rights in the collateral should the borrower fail financially.&#13;As a result, the value of Fund shares may fall and there may be a delay in recovering the loaned securities. The value of Fund&#13;shares could also fall if a loan is called and the Fund is required to liquidate reinvested collateral at a loss or if the investment&#13;adviser is unable to reinvest cash collateral at rates that exceed the costs involved.&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 sub- adviser to&#13;develop and effectively implement strategies to achieve the Fund&amp;#146;s investment objective. &amp;#160;Subjective decisions made&#13;by the sub- 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="AsOf2013-01-28_S000005300Member">&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. &amp;#160; As interest rates rise, the value&#13;of Fund shares is likely to decline. &amp;#160;Conversely, when interest rates decline, the value of Fund shares is likely to rise.&#13;&amp;#160;Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations&#13;are more sensitive to changes in interest rates than obligations with shorter maturities. &amp;#160;In a declining interest rate environment,&#13;prepayments of obligations may increase if the issuer has the ability to pre-pay or &amp;#147;call&amp;#148; the obligation. &amp;#160;In&#13;such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields. &amp;#160;Because the Fund is managed toward&#13;an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal&#13;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 Concentration Risk. &amp;#160;Because the Fund may concentrate&#13;its investments in certain types of municipal obligations and in certain sectors, the value of Fund shares may be affected by events&#13;that adversely affect 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;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. The Fund will not invest in an obligation if the interest on that obligation is subject&#13;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;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:BarChartAndPerformanceTableHeading contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt Times New Roman, Times, Serif; margin: 3.75pt 0"&gt;Performance&lt;/p&gt;</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2013-01-28_S000026932Member">&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 a broad-based securities market index. &amp;#160;The returns in the bar chart&#13;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;The Fund&amp;#146;s performance reflects&#13;the effects of expense reductions. &amp;#160;Absent these reductions, performance would have been lower. &amp;#160;Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;&#13;&#13;&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 2.8pt 0; text-align: center"&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2013-01-28_S000005280Member">&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 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 a broad-based securities market index . &amp;#160;The returns in the bar chart&#13;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;The Fund&amp;#146;s performance reflects&#13;the effects of expense reductions. &amp;#160;Absent these reductions, performance would have been lower. &amp;#160;Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2013-01-28_S000005300Member">&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 I shares. &amp;#160;Past performance (both before and after taxes) is no guarantee of future results. &amp;#160;Updated&#13;Fund performance information can be obtained by visiting www.eatonvance.com. &amp;#160;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
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    <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000026932Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
    <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000005280Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
    <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="AsOf2013-01-28_S000005300Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column period compact * column dei_LegalEntityAxis compact EVMFT_S000005300Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
    <rr:AnnualReturn2010 contextRef="AsOf2013-01-28_S000026932Member_C000081142Member" unitRef="Ratio" decimals="INF">0.1036</rr:AnnualReturn2010>
    <rr:AnnualReturn2010 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.2717</rr:AnnualReturn2010>
    <rr:AnnualReturn2010 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">-0.0050</rr:AnnualReturn2010>
    <rr:AnnualReturn2011 contextRef="AsOf2013-01-28_S000026932Member_C000081142Member" unitRef="Ratio" decimals="INF">0.2077</rr:AnnualReturn2011>
    <rr:AnnualReturn2011 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">-0.0628</rr:AnnualReturn2011>
    <rr:AnnualReturn2011 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.1187</rr:AnnualReturn2011>
    <rr:AnnualReturn2012 contextRef="AsOf2013-01-28_S000026932Member_C000081142Member" unitRef="Ratio" decimals="INF">0.0860</rr:AnnualReturn2012>
    <rr:AnnualReturn2012 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.1131</rr:AnnualReturn2012>
    <rr:AnnualReturn2012 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.1357</rr:AnnualReturn2012>
    <rr:AnnualReturn2003 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.2730</rr:AnnualReturn2003>
    <rr:AnnualReturn2003 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0739</rr:AnnualReturn2003>
    <rr:AnnualReturn2004 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.1005</rr:AnnualReturn2004>
    <rr:AnnualReturn2004 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0491</rr:AnnualReturn2004>
    <rr:AnnualReturn2008 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">-0.3173</rr:AnnualReturn2008>
    <rr:AnnualReturn2008 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">-0.2288</rr:AnnualReturn2008>
    <rr:AnnualReturn2005 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.0498</rr:AnnualReturn2005>
    <rr:AnnualReturn2005 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0529</rr:AnnualReturn2005>
    <rr:AnnualReturn2006 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.1211</rr:AnnualReturn2006>
    <rr:AnnualReturn2006 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0840</rr:AnnualReturn2006>
    <rr:AnnualReturn2007 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.1085</rr:AnnualReturn2007>
    <rr:AnnualReturn2007 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">-0.0138</rr:AnnualReturn2007>
    <rr:AnnualReturn2009 contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.3075</rr:AnnualReturn2009>
    <rr:AnnualReturn2009 contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.3198</rr:AnnualReturn2009>
    <rr:ShareholderFeesCaption contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Shareholder Fees (fees paid directly from your investment)&lt;/p&gt;</rr:ShareholderFeesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Annual Fund Operating Expenses (expenses you pay each year as a percentage of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)&lt;sup&gt;(1)&lt;/sup&gt;&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 12pt/12pt NewsGoth Dm BT,Times New Roman; margin-top: 4px; margin-bottom: 4px"&gt;Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)&lt;/p&gt;</rr:OperatingExpensesCaption>
    <rr:PerformanceTableTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;div style="display: none"&gt;~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * column dei_LegalEntityAxis compact EVMFT_S000026932Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
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    <rr:BarChartClosingTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the period from December 31, 2009 through December&#13;31, 2012 , the highest quarterly total return for Class A was 13.58 % for the quarter ended September 30, 2011, and the lowest&#13;quarterly return &amp;#160;was - 6.31 % for the quarter ended December 31, 2010.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2012 , the highest&#13;quarterly total return for Class A was 19.47 % for the quarter ended March 31, 2012 , and the lowest quarterly return was &amp;#150;22.14%&#13;for the quarter ended December 31, 2008.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2012, the highest&#13;quarterly total return for Class I was 13.94% for the quarter ended September 30, 2009, and the lowest quarterly return was &amp;#150;12.87%&#13;for the quarter ended December 31, 2008. &amp;#160;For the 30 days ended September 30, 2012, the SEC yield and SEC tax-equivalent yield&#13;(assuming a federal income tax rate of 35.00%) for Class A shares were 2.27% and 3.49%, respectively, for Class B and Class C shares&#13;were 1.64% and 2.52%, respectively, and for Class I shares were 2.63% and 4.05%, respectively. &amp;#160;A lower tax rate would result&#13;in lower tax-equivalent yields. &amp;#160;For current yield information call 1-800-262-1122.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class C. &amp;#160;The Fund commenced operations&#13;on November 17, 2009. &amp;#160;Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt/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 rates 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 to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities. &amp;#160;After-tax&#13;returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return After Taxes&#13;on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made&#13;during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or&#13;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="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (5.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class B and Class C. &amp;#160;&amp;#160;The Class&#13;I performance shown above for the period prior to May 2, 2011 (commencement of operations) is the performance of Class A shares&#13;at net asset value without adjustment for any differences in the expenses of the two classes. &amp;#160;If adjusted for other expenses,&#13;returns would be different. &amp;#160;Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 9pt/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 rates 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 to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities. &amp;#160;After-tax&#13;returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;Return After Taxes&#13;on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made&#13;during that period. &amp;#160;Also, Return After Taxes on Distributions and the Sale of Fund Shares for a period may be greater than&#13;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="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (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 May 2, 2006 (commencement of operations), is the performance of Class B shares, adjusted for&#13;sales charge that applies to Class C shares but not adjusted for any other differences in the expenses of the two classes. &amp;#160;If&#13;adjusted 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: 9pt/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 I 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:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2013-01-28_S000026932Member_C000081142Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
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    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005280Member_C000014423Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005280Member_C000014424Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005280Member_C000102333Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005300Member_C000014476Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0500</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0</rr:MaximumDeferredSalesChargeOverOther>
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    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000026932Member_C000081144Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
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    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000014424Member" unitRef="Ratio" decimals="INF">0.0095</rr:ManagementFeesOverAssets>
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    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014476Member" unitRef="Ratio" decimals="INF">0.0045</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0045</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0045</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0045</rr:ManagementFeesOverAssets>
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    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000026932Member_C000081143Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000026932Member_C000081144Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000014423Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000014424Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000102333Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014476Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0</rr:DistributionAndService12b1FeesOverAssets>
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    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000026932Member_C000081143Member" unitRef="Ratio" decimals="INF">0.0029</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000026932Member_C000081144Member" unitRef="Ratio" decimals="INF">0.0029</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000005280Member_C000014422Member" unitRef="Ratio" decimals="INF">0.0052</rr:OtherExpensesOverAssets>
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    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0025</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0025</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0025</rr:OtherExpensesOverAssets>
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    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2013-01-28_S000026932Member">&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 13 of this Prospectus and page 19 of the Fund&amp;#146;s Statement&#13;of Additional Information. &amp;#160;&lt;/p&gt;</rr:ExpenseBreakpointDiscounts>
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    <rr:ExpenseBreakpointDiscounts contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&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:ExpenseBreakpointDiscounts>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2013-01-28_S000026932Member">&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 taxable municipal obligations issued pursuant to the American Recovery and Reinvestment Act of 2009 (the&#13;&amp;#147;Act&amp;#148;) or other legislation providing for the issuance of taxable municipal debt on which the issuer receives federal&#13;support (any bonds so issued considered &amp;#147;Build America Bonds&amp;#148;) (the &amp;#147;80% Policy&amp;#148;). &amp;#160;Unlike most other&#13;municipal obligations, interest received on Build America Bonds is subject to federal income tax and may be subject to state income&#13;tax. &amp;#160;Under the terms of the Act, issuers of &amp;#147;direct pay&amp;#148; Build America Bonds are entitled to receive reimbursement&#13;from the U.S. Treasury currently equal to 35% (or 45% in the case of Recovery Zone Economic Development Bonds) of the interest&#13;paid on the bonds. &amp;#160;Holders of &amp;#147;tax credit&amp;#148; Build America Bonds receive a federal tax credit currently equal to&#13;35% of the coupon interest received. &amp;#160;The Fund expects to invest primarily in direct pay Build America Bonds and &amp;#147;principal&#13;only&amp;#148; strips of tax credit Build America Bonds. &amp;#160;The Fund does not expect to receive (or pass through to shareholders)&#13;tax credits as a result of its investments. &amp;#160;Provisions of the Act relevant to the issuance of Build America Bonds expired&#13;on December 31, 2010 and, as such, issuance has ceased. &amp;#160;&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;Under normal circumstances, the Fund invests primarily in&#13;equity securities. &amp;#160;Although the Fund can invest in equity securities of any size, it intends to focus its investments on&#13;mid-cap companies. &amp;#160;Mid-Cap companies are companies with market capitalizations within the range of capitalizations of companies&#13;included in the Russell Midcap Growth Index. &amp;#160;Although it invests primarily in U.S. traded securities (including depositary&#13;receipts evidencing ownership in underlying foreign stocks), the Fund may invest up to 25% of its total assets in foreign securities&#13;, including those trading in developed and emerging international markets. &amp;#160;The Fund may invest no more than 5% of its net&#13;assets in real estate investment trusts. &amp;#160;The Fund may also lend its securities.&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2013-01-28_S000005300Member">&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 obligations (including notes and tax-exempt commercial paper) issued by or on behalf of states, territories&#13;and possessions of the United States and the District of Columbia and their political subdivisions, agencies or instrumentalities,&#13;the interest on which is exempt from regular federal income tax (the &amp;#147;80% Policy&amp;#148;). &amp;#160;The Fund will not invest&#13;in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. &amp;#160;At least 65% of net&#13;assets will normally be invested in municipal obligations rated at least investment grade at the time of investment (which are&#13;those rated Baa or higher by Moody&amp;#146;s Investors Service, Inc. (&amp;#147;Moody&amp;#146;s&amp;#148;), or BBB or higher by either Standard&#13;&amp;#38; Poor&amp;#146;s Ratings Group (&amp;#147;S&amp;#38;P&amp;#148;) or Fitch Ratings (&amp;#147;Fitch&amp;#148;)) or, if unrated, determined by&#13;the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations&#13;rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser&#13;(&amp;#147;junk bonds&amp;#148;). &amp;#160;The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated&#13;obligations considered to be of comparable quality by the investment adviser. &amp;#160;For purposes of rating restrictions, if securities&#13;are rated differently by the rating agencies, the higher rating is used. &amp;#160;The Fund may invest in securities in any rating&#13;category, including those in default. &amp;#160;The Fund may purchase or sell derivative instruments (such as residual interest bonds,&#13;futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return&#13;or as a substitute for the purchase or sale of securities.&lt;/p&gt;</rr:StrategyPortfolioConcentration>
    <rr:RiskLoseMoney contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;&amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.&lt;/p&gt;</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;&amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.&lt;/p&gt;</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;&amp;#160;The Fund is not a complete&#13;investment program and you may lose money by investing in the Fund.&lt;/p&gt;</rr:RiskLoseMoney>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;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. &lt;/p&gt;</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;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. &lt;/p&gt;</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 0.05in 0"&gt;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. &lt;/p&gt;</rr:RiskNotInsuredDepositoryInstitution>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2013-01-28_S000026932Member">&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 a broad-based securities market index.&lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2013-01-28_S000005280Member">&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 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 a broad-based securities market index . &lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2013-01-28_S000005300Member">&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="AsOf2013-01-28_S000026932Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&amp;#160;The returns in the bar chart&#13;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;&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;&amp;#160;The returns in the bar chart&#13;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;&lt;/p&gt;</rr:BarChartDoesNotReflectSalesLoads>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2013-01-28_S000026932Member">&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="AsOf2013-01-28_S000005280Member">&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="AsOf2013-01-28_S000005300Member">&lt;p style="font: 10pt Times New Roman, Times, Serif; margin: 5.6pt 0"&gt;www.eatonvance.com&lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2013-01-28_S000026932Member">Past performance (both before and after taxes) is no guarantee of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2013-01-28_S000005280Member">Past performance (both before and after taxes) is no guarantee of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2013-01-28_S000005300Member">Past performance (both before and after taxes) is no guarantee of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2012 , the highest&#13;quarterly total return for Class A  was&lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2012 , the highest&#13;quarterly total return for Class I was&lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;During the ten years ended December 31, 2012 , the highest&#13;quarterly total return for Class I was&lt;/p&gt;</rr:HighestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;and the lowest quarterly return was&lt;/p&gt;</rr:LowestQuarterlyReturnLabel>
    <rr:ThirtyDayYieldPhone contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;For current yield&#13;information call 1-800-262-1122.&lt;/p&gt;</rr:ThirtyDayYieldPhone>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000026932Member">2011-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000005280Member">2012-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000005300Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2013-01-28_S000026932Member" unitRef="Ratio" decimals="INF">0.1358</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2013-01-28_S000005280Member" unitRef="Ratio" decimals="INF">0.1947</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2013-01-28_S000005300Member" unitRef="Ratio" decimals="INF">0.1394</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000026932Member">2010-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000005280Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2013-01-28_S000005300Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2013-01-28_S000026932Member" unitRef="Ratio" decimals="INF">-0.0631</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2013-01-28_S000005280Member" unitRef="Ratio" decimals="INF">-0.2214</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2013-01-28_S000005300Member" unitRef="Ratio" decimals="INF">-0.1287</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (4.75%) and any applicable contingent deferred sales charge (&amp;#147;CDSC&amp;#148;) for Class C. &lt;/p&gt;</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (5.75%) 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="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;These returns reflect the maximum sales charge for Class&#13;A (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:PerformanceTableUsesHighestFederalRate contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/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 rates 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="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/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 rates 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. &lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/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.&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;After-tax&#13;returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities. &lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax&#13;returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities. &lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;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.&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax&#13;returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;&lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;After-tax&#13;returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. &amp;#160;&lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/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 I shares. &lt;/p&gt;</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2013-01-28_S000026932Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return After Taxes&#13;on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made&#13;during that period. &amp;#160;Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or&#13;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="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;Return After Taxes&#13;on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made&#13;during that period. &amp;#160;Also, Return After Taxes on Distributions and the Sale of Fund Shares for a period may be greater than&#13;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="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/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:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2013-01-28_S000005280Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;&amp;#160;The Class&#13;I performance shown above for the period prior to May 2, 2011 (commencement of operations) is the performance of Class A shares&#13;at net asset value without adjustment for any differences in the expenses of the two classes. &amp;#160;If adjusted for other expenses,&#13;returns would be different. &lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2013-01-28_S000005300Member">&lt;p style="font: 9pt/10pt Times New Roman, Times, Serif; margin: 2.8pt 0"&gt;The Class C performance&#13;shown above for the period prior to May 2, 2006 (commencement of operations), is the performance of Class B shares, adjusted for&#13;sales charge that applies to Class C shares but not adjusted for any other differences in the expenses of the two classes. &amp;#160;If&#13;adjusted for other expenses, returns would be different.&lt;/p&gt;</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:ThirtyDayYield contextRef="AsOf2013-01-28_S000005300Member_C000014476Member" unitRef="Ratio" decimals="INF">0.0227</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0164</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0164</rr:ThirtyDayYield>
    <rr:ThirtyDayYield contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0263</rr:ThirtyDayYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2013-01-28_S000005300Member_C000014476Member" unitRef="Ratio" decimals="INF">0.0349</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2013-01-28_S000005300Member_C000014477Member" unitRef="Ratio" decimals="INF">0.0252</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2013-01-28_S000005300Member_C000038314Member" unitRef="Ratio" decimals="INF">0.0252</rr:ThirtyDayTaxEquivalentYield>
    <rr:ThirtyDayTaxEquivalentYield contextRef="AsOf2013-01-28_S000005300Member_C000014478Member" unitRef="Ratio" decimals="INF">0.0405</rr:ThirtyDayTaxEquivalentYield>
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      <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Foot-02_loc" xlink:to="Footnote-02" 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 has agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.95% for Class A shares, 1.70% for Class C shares and 0.70% for Class I shares. This expense reimbursement will continue through January 31, 2014. 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:footnote xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:label="Footnote-02" xml:lang="en-US">The administrator and the sub-adviser have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.40% for Class A shares, 2.15% for Class B and Class C shares and 1.15% for Class I shares. This expense reimbursement will continue through January 31, 2014. 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 administrator and sub-adviser 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:footnote xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:label="Footnote-03" xml:lang="en-US">Shares purchased by shareholders who owned shares on December 31, 1997 will be subject to a sales charge as described under "Purchasing Shares" in this Prospectus.</link:footnote>
    </link:footnoteLink>
</xbrli:xbrl>
