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    <rr:PortfolioTurnoverRate contextRef="AsOf2020-05-29_custom_S000027034Member" unitRef="Ratio" decimals="INF">0.28</rr:PortfolioTurnoverRate>
    <rr:PortfolioTurnoverRate contextRef="AsOf2020-05-29_custom_S000004834Member" unitRef="Ratio" decimals="INF">0.23</rr:PortfolioTurnoverRate>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000024906Member">Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of municipal obligations, the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). In seeking the Fund&#8217;s investment objective, the portfolio managers emphasize tax-exempt income. The Fund normally invests in municipal obligations rated in the three highest rating categories (those rated A or higher by S&amp;P Global Ratings (&#8220;S&amp;P&#8221;), Fitch Ratings (&#8220;Fitch&#8221;) or Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality at the time of purchase. The Fund will not invest more than 50% of its net assets in municipal obligations rated A at the time of purchase by S&amp;P, Fitch or Moody&#8217;s or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality. For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund may continue to hold securities that are downgraded (including bonds downgraded to below investment grade credit quality (&#8220;junk bonds&#8221;)) if the sub-adviser believes it would be advantageous to do so. The Fund will not invest in a municipal obligation the interest on which the Fund&#8217;s sub-adviser believes is subject to the federal alternative minimum tax.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000027033Member">Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of municipal obligations the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). In seeking the Fund&#8217;s investment objective, the portfolio managers emphasize tax-exempt income. The Fund normally invests in municipal obligations rated in the three highest rating categories (those rated A or higher by S&amp;P Global Ratings (&#8220;S&amp;P&#8221;), Fitch Ratings (&#8220;Fitch&#8221;) or Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of comparable quality at the time of purchase. The Fund will not invest more than 50% of its net assets in municipal obligations rated A at the time of purchase by S&amp;P, Fitch or Moody&#8217;s or, if unrated determined by the investment adviser or sub-adviser to be of comparable quality. For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund may continue to hold securities that are downgraded (including bonds downgraded to below investment grade credit quality (&#8220;junk bonds&#8221;)) if the sub-adviser believes it would be advantageous to do so. The Fund will not invest in a municipal obligation if the sub-adviser believes the interest on such obligation is subject to the federal alternative minimum tax.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000049164Member">Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities of between one and ten years, the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). For the purposes of the Fund&#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the Fund purchases such obligation, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&#8217;s net assets normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;), or BBB or higher by either S&amp;P Global Ratings (&#8220;S&amp;P&#8221;) or Fitch Ratings (&#8220;Fitch&#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or sub-adviser (&#8220;junk bonds&#8221;). For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000049165Member">Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities of between ten and twenty years, the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). For the purposes of the Fund&#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond or (iv) the monthly re-set date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the Fund purchases such obligation, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&#8217;s net assets normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;), or BBB or higher by either S&amp;P Global Ratings (&#8220;S&amp;P&#8221;) or Fitch Ratings (&#8220;Fitch&#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or sub-adviser (&#8220;junk bonds&#8221;). For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000027034Member">Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities of between five and fifteen years, the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). For the purposes of the Fund&#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the Fund purchases such obligations, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&#8217;s net assets normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;), or BBB or higher by either S&amp;P Global Ratings (&#8220;S&amp;P&#8221;) or Fitch Ratings (&#8220;Fitch&#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or sub-adviser (&#8220;junk bonds&#8221;). For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.</rr:StrategyPortfolioConcentration>
    <rr:StrategyPortfolioConcentration contextRef="AsOf2020-05-29_custom_S000004834Member">Under normal market circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations (including notes and tax-exempt commercial paper) issued by or on behalf of states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies or instrumentalities, the interest on which is exempt from regular federal income tax (the &#8220;80% Policy&#8221;). The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax. The Fund will primarily invest in &#8220;high yield&#8221; municipal obligations under normal market conditions. For this purpose, &#8220;high yield&#8221; municipal obligations are municipal obligations rated at the time of investment either Baa or lower by Moody&#8217;s Investors Service, Inc. (&#8220;Moody&#8217;s&#8221;), or BBB or lower by either S&amp;P Global Ratings (&#8220;S&amp;P&#8221;) or Fitch Ratings (&#8220;Fitch&#8221;) or, if unrated, determined by the investment adviser to be of comparable quality. &#8220;High yield&#8221; municipal obligations rated below investment grade are also known as &#8220;junk bonds.&#8221; The Fund may invest in securities in any rating category, including those in default. For purposes of rating restrictions, if securities are rated differently by two or more rating agencies, the lowest rating will be used for any Fund rating restrictions. The Fund may also invest a portion of its assets in municipal obligations that are not paying current income in anticipation of possible future income. The Fund may invest up to 20% of its net assets in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities. The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, total return swaps, credit derivatives and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities. There is no stated limit on the Fund&#8217;s use of derivatives. The portfolio manager may also consider financially material environmental, social and governance factors in evaluating an issuer. These considerations may be taken into account alongside other factors in the investment selection process.</rr:StrategyPortfolioConcentration>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000024906Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000027033Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000049164Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000049165Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000027034Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskLoseMoney contextRef="AsOf2020-05-29_custom_S000004834Member">The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000024906Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000027033Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000049164Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000049165Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000027034Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:RiskNotInsuredDepositoryInstitution contextRef="AsOf2020-05-29_custom_S000004834Member">An investment 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 government agency.</rr:RiskNotInsuredDepositoryInstitution>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000024906Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of two broad-based securities market indices.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000027033Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of two broad-based securities market indices.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000049164Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000049165Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000027034Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of two broad-based securities market indices.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="AsOf2020-05-29_custom_S000004834Member">The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund&#8217;s performance from year to year and how the Fund&#8217;s average annual returns over time compare with those of two broad-based securities market indices.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000024906Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000027033Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000049164Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000049165Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000027034Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="AsOf2020-05-29_custom_S000004834Member">Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000024906Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000027033Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000049164Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000049165Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000027034Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="AsOf2020-05-29_custom_S000004834Member">www.eatonvance.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000024906Member">The returns in the bar chart reflect the effects of expense reductions. Absent these reductions, performance for certain periods would have been lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000027033Member">The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000049164Member">The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000049165Member">The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000027034Member">The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000004834Member">The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000024906Member">The year-to-date total return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000027033Member">The year-to-date total return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000049164Member">The year-to-date return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000049165Member">The year-to-date total return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000027034Member">The year-to-date total return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:YearToDateReturnLabel contextRef="AsOf2020-05-29_custom_S000004834Member">The year-to-date total return through the end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was</rr:YearToDateReturnLabel>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000024906Member" unitRef="Ratio" decimals="INF">0.0164</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000027033Member" unitRef="Ratio" decimals="INF">0.00</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000049164Member" unitRef="Ratio" decimals="INF">-0.0087</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000049165Member" unitRef="Ratio" decimals="INF">-0.0017</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000027034Member" unitRef="Ratio" decimals="INF">-0.0043</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturn contextRef="AsOf2020-05-29_custom_S000004834Member" unitRef="Ratio" decimals="INF">-0.0371</rr:BarChartYearToDateReturn>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000024906Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000027033Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000049164Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000049165Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000027034Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:BarChartYearToDateReturnDate contextRef="AsOf2020-05-29_custom_S000004834Member">2020-03-31</rr:BarChartYearToDateReturnDate>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000024906Member">For the ten years ended December 31, 2019, the highest quarterly total return for the Fund or Predecessor Account was</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000027033Member">During the period from December 31, 2010 to December 31, 2019, the highest quarterly total return for Class A was</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000049164Member">During the period from December 31, 2015 to December 31, 2019, the highest quarterly total return for Class A was</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000049165Member">During the period from December 31, 2015 to December 31, 2019, the highest quarterly total return for Class A was</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000027034Member">During the period from December 31, 2010 to December 31, 2019, the highest quarterly total return for Class A was</rr:HighestQuarterlyReturnLabel>
    <rr:HighestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000004834Member">For the ten years ended December 31, 2019, the highest quarterly total return for Class A was</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000024906Member" unitRef="Ratio" decimals="INF">0.0224</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000027033Member" unitRef="Ratio" decimals="INF">0.0375</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000049164Member" unitRef="Ratio" decimals="INF">0.0203</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000049165Member" unitRef="Ratio" decimals="INF">0.0408</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000027034Member" unitRef="Ratio" decimals="INF">0.0514</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000004834Member" unitRef="Ratio" decimals="INF">0.0632</rr:BarChartHighestQuarterlyReturn>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000024906Member">2011-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000027033Member">2011-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000049164Member">2019-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000049165Member">2016-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000027034Member">2014-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000004834Member">2014-03-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000024906Member">and the lowest quarterly return for the Fund or Predecessor Account was</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000027033Member">and the lowest quarterly return was</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000049164Member">and the lowest quarterly return was</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000049165Member">and the lowest quarterly return was</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000027034Member">and the lowest quarterly return was</rr:LowestQuarterlyReturnLabel>
    <rr:LowestQuarterlyReturnLabel contextRef="AsOf2020-05-29_custom_S000004834Member">and the lowest quarterly return was</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000024906Member">2016-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000027033Member">2016-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000049164Member">2016-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000049165Member">2016-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000027034Member">2013-06-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="AsOf2020-05-29_custom_S000004834Member">2010-12-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000024906Member" unitRef="Ratio" decimals="INF">-0.0236</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000027033Member" unitRef="Ratio" decimals="INF">-0.0407</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000049164Member" unitRef="Ratio" decimals="INF">-0.0289</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000049165Member" unitRef="Ratio" decimals="INF">-0.0541</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000027034Member" unitRef="Ratio" decimals="INF">-0.0510</rr:BarChartLowestQuarterlyReturn>
    <rr:BarChartLowestQuarterlyReturn contextRef="AsOf2020-05-29_custom_S000004834Member" unitRef="Ratio" decimals="INF">-0.0699</rr:BarChartLowestQuarterlyReturn>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000024906Member_custom_BloombergBarclays5YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deductions for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000024906Member_custom_BloombergBarclaysMunicipalManagedMoney17YearBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deductions for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000027033Member_custom_BloombergBarclaysMunicipalManagedMoneyIntermediate1To17YearBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000027033Member_custom_BloombergBarclays7YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000049164Member_custom_BloombergBarclaysShortIntermediate110YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000049165Member_custom_BloombergBarclays15YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000027034Member_custom_BloombergBarclays10YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000027034Member_custom_BloombergBarclays15YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesOneMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:IndexNoDeductionForFeesExpensesTaxes contextRef="AsOf2020-05-29_custom_S000004834Member_custom_BloombergBarclaysMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember">(reflects no deduction for fees, expenses or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000024906Member">These returns reflect the maximum sales charge for Class A (2.25%) and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000027033Member">These returns reflect the maximum sales charge for Class A (4.75%) effective December 2, 2019 and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000049164Member">These returns reflect the maximum sales charge for Class A (2.25%) effective December 19, 2019 and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000049165Member">These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000027034Member">These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableDoesReflectSalesLoads contextRef="AsOf2020-05-29_custom_S000004834Member">These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (&#8220;CDSC&#8221;) for Class C.</rr:PerformanceTableDoesReflectSalesLoads>
    <rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod contextRef="AsOf2020-05-29_custom_S000024906Member">The performance shown above for each Class for the period prior to March 27, 2009 (commencement of operations) is that of the Predecessor Account adjusted to reflect any applicable sales charge or CDSC of the Class but not adjusted for any other differences in expenses among the Classes. If adjusted for such differences, returns would be different.</rr:PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member">2015-05-04</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnInceptionDate contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member">2010-02-01</rr:AverageAnnualReturnInceptionDate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000024906Member">After-Tax Return is calculated using the highest historical individual federal income tax rates and does not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the actual characterization of distributions, and may differ from those shown</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000027033Member">After-tax returns are calculated using the highest historical individual federal income tax rates and does not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the actual characterization of distributions, and may differ from those shown.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000049164Member">After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the actual characterization of distributions, and may differ from those shown.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000049165Member">After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the actual characterization of distributions, and may differ from those shown.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000027034Member">After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the actual characterization of distributions, and may differ from those shown.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableUsesHighestFederalRate contextRef="AsOf2020-05-29_custom_S000004834Member">After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder&#8217;s tax situation and the characterization of distributions, and may differ from those shown.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000024906Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000027033Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000049164Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000049165Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000027034Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="AsOf2020-05-29_custom_S000004834Member">After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000024906Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000027033Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000049164Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000049165Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000027034Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="AsOf2020-05-29_custom_S000004834Member">After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000024906Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares. After-Tax Returns are not shown for the Ten Years ended December 31, 2018 because the Predecessor Account, unlike a registered investment company, was not required to make annual income distributions to its investors.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000027033Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000049164Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000049165Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000027034Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:PerformanceTableExplanationAfterTaxHigher contextRef="AsOf2020-05-29_custom_S000004834Member">Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.</rr:PerformanceTableExplanationAfterTaxHigher>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member">May 31, 2021</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074079Member" unitRef="Ratio" decimals="INF">0.0225</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074080Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074081Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0225</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0475</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074079Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074080Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074081Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
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    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOfferingPrice>
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    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0060</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0032</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0042</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0042</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0042</rr:ManagementFeesOverAssets>
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    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074080Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074081Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0000</rr:DistributionAndService12b1FeesOverAssets>
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    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074080Member" unitRef="Ratio" decimals="INF">0.0012</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074081Member" unitRef="Ratio" decimals="INF">0.0012</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0026</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0026</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0026</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0102</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" decimals="INF">0.0102</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" decimals="INF">0.0102</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0010</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0010</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0010</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0022</rr:OtherExpensesOverAssets>
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    <rr:ExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0073</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0083</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0158</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0058</rr:ExpensesOverAssets>
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    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" id="Foot-01-1" decimals="INF">-0.0008</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" id="Foot-01-2" decimals="INF">-0.0008</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" id="Foot-02-0" decimals="INF">-0.0018</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" id="Foot-02-1" decimals="INF">-0.0018</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" id="Foot-02-2" decimals="INF">-0.0018</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" id="Foot-02-3" decimals="INF">-0.0094</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" id="Foot-02-4" decimals="INF">-0.0094</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" id="Foot-02-5" decimals="INF">-0.0094</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" id="Foot-02-6" decimals="INF">-0.0002</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" id="Foot-02-7" decimals="INF">-0.0002</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" id="Foot-02-8" decimals="INF">-0.0002</rr:FeeWaiverOrReimbursementOverAssets>
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    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member_rr_AfterTaxesOnDistributionsAndSalesMember" unitRef="Ratio" decimals="INF">0.0328</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081346Member" unitRef="Ratio" decimals="INF">0.0344</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081347Member" unitRef="Ratio" decimals="INF">0.0448</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027033Member_custom_BloombergBarclaysMunicipalManagedMoneyIntermediate1To17YearBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember" unitRef="Ratio" decimals="INF">0.0381</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027033Member_custom_BloombergBarclays7YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember" unitRef="Ratio" decimals="INF">0.0383</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0190</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member_rr_AfterTaxesOnDistributionsMember" unitRef="Ratio" decimals="INF">0.0187</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member_rr_AfterTaxesOnDistributionsAndSalesMember" unitRef="Ratio" decimals="INF">0.0176</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154968Member" unitRef="Ratio" decimals="INF">0.0164</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154969Member" unitRef="Ratio" decimals="INF">0.0270</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049164Member_custom_BloombergBarclaysShortIntermediate110YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember" unitRef="Ratio" decimals="INF">0.0245</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0410</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member_rr_AfterTaxesOnDistributionsMember" unitRef="Ratio" decimals="INF">0.0403</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member_rr_AfterTaxesOnDistributionsAndSalesMember" unitRef="Ratio" decimals="INF">0.0375</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154971Member" unitRef="Ratio" decimals="INF">0.0440</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154972Member" unitRef="Ratio" decimals="INF">0.0546</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000049165Member_custom_BloombergBarclays15YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember" unitRef="Ratio" decimals="INF">0.0458</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0529</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member_rr_AfterTaxesOnDistributionsMember" unitRef="Ratio" decimals="INF">0.0485</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member_rr_AfterTaxesOnDistributionsAndSalesMember" unitRef="Ratio" decimals="INF">0.0451</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081349Member" unitRef="Ratio" decimals="INF">0.0502</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081350Member" unitRef="Ratio" decimals="INF">0.0607</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_BloombergBarclays10YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesMember" unitRef="Ratio" decimals="INF">0.0460</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnSinceInception contextRef="AsOf2020-05-29_custom_S000027034Member_custom_BloombergBarclays15YearMunicipalBondIndexReflectsNoDeductionForFeesExpensesOrTaxesOneMember" unitRef="Ratio" decimals="INF">0.0522</rr:AverageAnnualReturnSinceInception>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectiveHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Investment Objective</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to seek after-tax total return.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to seek after-tax total return.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to provide current income&#13;exempt from regular federal income tax.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to provide current income&#13;exempt from regular federal income tax.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to seek current income exempt&#13;from regular federal income tax.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ObjectivePrimaryTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund's investment objective is to provide high current income&#13;exempt from regular federal income tax.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Fees and Expenses of the Fund</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $100,000 in Eaton Vance funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges on page 24 of this Prospectus and page 21 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges beginning on page 24 of this Prospectus and page 21 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges beginning on page 22 of this Prospectus and page 21 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges beginning on page 22 of this Prospectus and page 21 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges beginning on page 18 of this Prospectus and page 23 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;This table describes the fees and expenses that you may pay&#13;if you buy and hold shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary when they&#13;buy and hold shares of the Fund, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class&#13;A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance funds. Certain financial intermediaries&#13;also may offer variations in Fund sales charges to their customers as described in Appendix A &amp;#8211; Financial Intermediary Sales&#13;Charge Variations in this Prospectus. More information about these and other discounts is available from your financial intermediary&#13;and in Sales Charges beginning on page 20 of this Prospectus and page 20 of the Fund&amp;#8217;s Statement of Additional Information.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000024906Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000027033Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000049164Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000049165Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000027034Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesCaption contextRef="AsOf2020-05-29_custom_S000004834Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:ShareholderFeesTableTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/ShareholderFeesData column period compact * column dei_LegalEntityAxis compact evmtii_S000024906Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
    <rr:ShareholderFeesTableTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/ShareholderFeesData column period compact * column dei_LegalEntityAxis compact evmtii_S000027033Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
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    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000024906Member">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000027033Member">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000049164Member">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000049165Member">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000027034Member" id="Foot-03-0">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:OperatingExpensesCaption contextRef="AsOf2020-05-29_custom_S000004834Member">Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
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    <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/OperatingExpensesData column period compact * column dei_LegalEntityAxis compact evmtii_S000004834Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Example.</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&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. The Example assumes that you invest $10,000 in the Fund for the time&#13;periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment&#13;has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in&#13;place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would&#13;be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
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    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#8220;turns over&amp;#8221; the portfolio). A higher portfolio turnover rate may indicate higher transaction&#13;costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual&#13;Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund's&#13;portfolio turnover rate was 51% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#8220;turns over&amp;#8221; the portfolio). A higher portfolio turnover rate may indicate higher transaction&#13;costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual&#13;Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund's&#13;portfolio turnover rate was 74% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#8220;turns over&amp;#8221; the portfolio). A higher portfolio turnover rate may indicate higher transaction&#13;costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual&#13;Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund's&#13;portfolio turnover was 41% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#8220;turns over&amp;#8221; the portfolio). A higher portfolio turnover rate may indicate higher transaction&#13;costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual&#13;Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund's&#13;portfolio turnover was 33% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund and Portfolio in which it invests pay transaction costs,&#13;such as commissions, when they buy and sell securities (or &amp;#8220;turn over&amp;#8221; the portfolio). A higher portfolio turnover&#13;rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These&#13;costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During&#13;the most recent fiscal year, the Portfolio's portfolio turnover rate was 28% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund pays transaction costs, such as commissions, when it&#13;buys and sells securities (or &amp;#8220;turns over&amp;#8221; the portfolio). A higher portfolio turnover rate may indicate higher transaction&#13;costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual&#13;Fund Operating Expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund's&#13;portfolio turnover rate was 23% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market conditions, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of municipal obligations,&#13;the interest on which is exempt from regular federal income tax (the &amp;#8220;80% Policy&amp;#8221;). In seeking the Fund&amp;#8217;s investment&#13;objective, the portfolio managers emphasize tax-exempt income. The Fund normally invests in municipal obligations rated in the&#13;three highest rating categories (those rated A or higher by S&amp;#38;P Global Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;), Fitch Ratings (&amp;#8220;Fitch&amp;#8221;)&#13;or Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;)) or, if unrated, determined by the investment adviser or&#13;sub-adviser to be of comparable quality at the time of purchase. The Fund will not invest more than 50% of its net assets in municipal&#13;obligations rated A at the time of purchase by S&amp;#38;P, Fitch or Moody&amp;#8217;s or, if unrated, determined by the investment adviser&#13;or sub-adviser to be of comparable quality. For purposes of rating restrictions, if securities are rated differently by two or&#13;more rating agencies, the highest rating is used. The Fund may continue to hold securities that are downgraded (including bonds&#13;downgraded to below investment grade credit quality (&amp;#8220;junk bonds&amp;#8221;)) if the sub-adviser believes it would be advantageous&#13;to do so. The Fund will not invest in a municipal obligation the interest on which the Fund&amp;#8217;s sub-adviser believes is subject&#13;to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;With respect to its investment in municipal&#13;obligations, the Fund invests primarily in general obligation or revenue bonds. The Fund currently targets an average portfolio&#13;duration of approximately 2 - 4.5 years and an average weighted portfolio maturity of approximately 3 - 6 years, but may invest&#13;in securities of any maturity or duration, and may in the future alter its maturity or duration target range. The Fund may use&#13;various techniques to shorten or lengthen its dollar-weighted average portfolio duration, including the acquisition of municipal&#13;obligations at a premium or discount. The portfolio managers generally will seek to enhance after-tax total return by actively&#13;engaging in relative value trading within the portfolio to take advantage of price opportunities in the markets for municipal obligations&#13;and use relative value analysis to assist them in making decisions to purchase or sell investments. With respect to 20% of its&#13;net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations&#13;of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises. The&#13;Fund may hold cash and may invest in cash equivalents and money market instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The sub-adviser&amp;#8217;s process for selecting&#13;municipal obligations for purchase and sale generally includes consideration of the creditworthiness of the issuer or person obligated&#13;to repay the obligation. In evaluating creditworthiness, the sub-adviser considers ratings assigned by rating agencies and generally&#13;performs additional credit and investment analysis. The portfolio managers may also trade securities to minimize taxable capital&#13;gains to shareholders. The portfolio managers may sell a security when its credit quality declines, when the remaining maturity&#13;of a fixed-income security reaches a certain point or to pursue more attractive investment options. The portfolio managers may&#13;also consider financially material environmental, social and governance factors in evaluating an issuer. These considerations may&#13;be taken into account alongside other fundamental research in the investment selection process.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market conditions, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of municipal obligations&#13;the interest on which is exempt from regular federal income tax (the &amp;#8220;80% Policy&amp;#8221;). In seeking the Fund&amp;#8217;s investment&#13;objective, the portfolio managers emphasize tax-exempt income. The Fund normally invests in municipal obligations rated in the&#13;three highest rating categories (those rated A or higher by S&amp;#38;P Global Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;), Fitch Ratings (&amp;#8220;Fitch&amp;#8221;)&#13;or Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;)) or, if unrated, determined by the investment adviser or&#13;sub-adviser to be of comparable quality at the time of purchase. The Fund will not invest more than 50% of its net assets in municipal&#13;obligations rated A at the time of purchase by S&amp;#38;P, Fitch or Moody&amp;#8217;s or, if unrated determined by the investment adviser&#13;or sub-adviser to be of comparable quality. For purposes of rating restrictions, if securities are rated differently by two or&#13;more rating agencies, the highest rating is used. The Fund may continue to hold securities that are downgraded (including bonds&#13;downgraded to below investment grade credit quality (&amp;#8220;junk bonds&amp;#8221;)) if the sub-adviser believes it would be advantageous&#13;to do so. The Fund will not invest in a municipal obligation if the sub-adviser believes the interest on such obligation is subject&#13;to the federal alternative minimum tax.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;With respect to its investment in municipal&#13;obligations, the Fund invests primarily in general obligation or revenue bonds. The Fund currently targets an average portfolio&#13;duration of approximately 5 - 7 years and an average weighted portfolio maturity of approximately 5 - 13 years, but may invest&#13;in securities of any maturity or duration, and may in the future alter its maturity or duration target range. The Fund may use&#13;various techniques to shorten or lengthen its dollar weighted average portfolio duration, including the acquisition of municipal&#13;obligations at a premium or discount. The portfolio managers generally will seek to enhance after-tax total return by actively&#13;engaging in relative value trading within the portfolio to take advantage of price opportunities in the markets for municipal obligations&#13;and use relative value analysis to assist them in making decisions to purchase or sell investments. With respect to 20% of its&#13;net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct obligations&#13;of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises. The&#13;Fund may hold cash and may invest in cash equivalents and money market instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The sub-adviser&amp;#8217;s process for selecting&#13;municipal obligations for purchase and sale generally includes consideration of the creditworthiness of the issuer or person obligated&#13;to repay the obligation. In evaluating creditworthiness, the sub-adviser considers ratings assigned by rating agencies and generally&#13;performs additional credit and investment analysis. The portfolio managers may also trade securities to minimize taxable capital&#13;gains to shareholders. The portfolio managers may sell a security when its credit quality declines, when the remaining maturity&#13;of a fixed-income security reaches a certain point or to pursue more attractive investment options. The portfolio managers may&#13;also consider financially material environmental, social and governance factors in evaluating an issuer. These considerations may&#13;be taken into account alongside other fundamental research in the investment selection process.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market conditions, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities&#13;of between one and ten years, the interest on which is exempt from regular federal income tax (the &amp;#8220;80% Policy&amp;#8221;). For&#13;the purposes of the Fund&amp;#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond; (ii)&#13;the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set date&#13;of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after the&#13;Fund purchases such obligation, the final maturity of such obligation remains the stated maturity. All municipal obligations maturing&#13;within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&amp;#8217;s net assets normally&#13;is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher&#13;by Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;), or BBB or higher by either S&amp;#38;P Global Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;)&#13;or Fitch Ratings (&amp;#8220;Fitch&amp;#8221;)) or, if unrated, determined by the investment adviser or sub-adviser to be of at least investment&#13;grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal&#13;obligations considered to be of comparable quality by the investment adviser or sub-adviser (&amp;#8220;junk bonds&amp;#8221;). For purposes&#13;of rating restrictions, if securities are rated differently by two or more rating agencies, the highest rating is used. The Fund&#13;will not invest in an obligation if the interest on that obligation is subject to the federal alternative minimum tax. With respect&#13;to 20% of its net assets, the Fund may invest in municipal obligations that are not exempt from regular federal income tax, direct&#13;obligations of the U.S. Treasury and/or obligations of U.S. Government agencies, instrumentalities and government-sponsored enterprises.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The Fund invests primarily in general obligation&#13;or revenue bonds. In pursuing its investment objective, the Fund seeks to weight investment in obligations such that at least 5%&#13;and not more than 15% of its net assets are invested in obligations with a final maturity in a year within the one-to-ten year&#13;maturity range (the &amp;#8220;weighted investment strategy&amp;#8221;). The Fund does not have a specific target for its average portfolio&#13;duration. When a municipal obligation has a final maturity of less than one year, the Fund intends to sell that security or let&#13;it mature and reinvest the proceeds in obligations with longer maturities. With respect to the Fund&amp;#8217;s weighted investment&#13;strategy, the Fund intends to invest at least 5% of its net assets in securities with a final maturity of 10 years within 90 days&#13;of the beginning of the calendar year. The Fund&amp;#8217;s portfolio is &amp;#8220;laddered&amp;#8221; by investing in municipal obligations&#13;with different final maturities so that some obligations age out of the one-to-ten year maturity range during each year.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The investment sub-adviser&amp;#8217;s process&#13;for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay&#13;the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment sub-adviser&#13;considers ratings assigned by rating agencies and generally performs additional credit and investment analysis. The portfolio managers&#13;may also trade securities to seek to minimize capital gains to shareholders. The portfolio managers may also consider financially&#13;material environmental, social and governance factors in evaluating an issuer. These considerations may be taken into account alongside&#13;other factors in the investment selection process.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market conditions, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities&#13;of between ten and twenty years, the interest on which is exempt from regular federal income tax (the &amp;#8220;80% Policy&amp;#8221;).&#13;For the purposes of the Fund&amp;#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond;&#13;(ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond or (iv) the monthly re-set&#13;date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after&#13;the Fund purchases such obligation, the final maturity of such obligation remains the stated maturity. All municipal obligations&#13;maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&amp;#8217;s net assets&#13;normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated&#13;Baa or higher by Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;), or BBB or higher by either S&amp;#38;P Global&#13;Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;) or Fitch Ratings (&amp;#8220;Fitch&amp;#8221;)) or, if unrated, determined by the investment adviser or&#13;sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated&#13;below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or&#13;sub-adviser (&amp;#8220;junk bonds&amp;#8221;). For purposes of rating restrictions, if securities are rated differently by two or more&#13;rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject&#13;to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that&#13;are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies,&#13;instrumentalities and government-sponsored enterprises.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The Fund invests primarily in general obligation&#13;or revenue bonds. In pursuing its investment objective, the Fund seeks to weight investment in obligations such that at least 5%&#13;and not more than 15% of its net assets are invested in obligations with a final maturity in a year within the ten-to-twenty year&#13;maturity range (the &amp;#8220;weighted investment strategy&amp;#8221;). The Fund does not have a specific target for its average portfolio&#13;duration. When a municipal obligation has a final maturity of less than ten years, the Fund intends to sell that security within&#13;a year and reinvest the proceeds in obligations with longer maturities. With respect to the Fund&amp;#8217;s weighted investment strategy,&#13;the Fund intends to invest at least 5% of its net assets in securities with a final maturity of 20 years within 90 days of the&#13;beginning of the calendar year. The Fund&amp;#8217;s portfolio is &amp;#8220;laddered&amp;#8221; by investing in municipal obligations with&#13;different final maturities so that some obligations age out of the ten-to-twenty year maturity range during each year.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The investment sub-adviser&amp;#8217;s process&#13;for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay&#13;the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment sub-adviser&#13;considers ratings assigned by rating agencies and generally performs additional credit and investment analysis. The portfolio managers&#13;may also trade securities to seek to minimize capital gains to shareholders. The portfolio managers may also consider financially&#13;material environmental, social and governance factors in evaluating an issuer. These considerations may be taken into account alongside&#13;other factors in the investment selection process.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market conditions, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations with final maturities&#13;of between five and fifteen years, the interest on which is exempt from regular federal income tax (the &amp;#8220;80% Policy&amp;#8221;).&#13;For the purposes of the Fund&amp;#8217;s 80% Policy, final maturity is defined as (i) the stated final maturity of a callable bond;&#13;(ii) the pre-refunded date of an existing pre-refunded bond; (iii) the earliest put date of a put bond; or (iv) the monthly re-set&#13;date of a municipal floating-rate bond or obligation. For municipal obligations held by the Fund that become pre-refunded after&#13;the Fund purchases such obligations, the final maturity of such obligation remains the stated maturity. All municipal obligations&#13;maturing within a calendar year will be defined as having the same final maturity. At least 90% of the Fund&amp;#8217;s net assets&#13;normally is invested in municipal obligations rated at least investment grade at the time of investment (which are those rated&#13;Baa or higher by Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;), or BBB or higher by either S&amp;#38;P Global&#13;Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;) or Fitch Ratings (&amp;#8220;Fitch&amp;#8221;)) or, if unrated, determined by the investment adviser or&#13;sub-adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated&#13;below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser or&#13;sub-adviser (&amp;#8220;junk bonds&amp;#8221;). For purposes of rating restrictions, if securities are rated differently by two or more&#13;rating agencies, the highest rating is used. The Fund will not invest in an obligation if the interest on that obligation is subject&#13;to the federal alternative minimum tax. With respect to 20% of its net assets, the Fund may invest in municipal obligations that&#13;are not exempt from regular federal income tax, direct obligations of the U.S. Treasury and/or obligations of U.S. Government agencies,&#13;instrumentalities and government-sponsored enterprises.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The Fund invests primarily in general obligation&#13;or revenue bonds. In pursuing its investment objective, the Fund seeks to weight investment in obligations such that at least 5%&#13;and not more than 15% of its net assets are invested in obligations with a final maturity in a year within the five-to-fifteen&#13;year maturity range (the &amp;#8220;weighted investment strategy&amp;#8221;). The Fund does not have a specific target for its average&#13;portfolio duration. When a municipal obligation has a final maturity of less than five years, the Fund intends to sell that security&#13;within a year and reinvest the proceeds in obligations with longer maturities. With respect to the Fund's weighted investment strategy,&#13;the Fund intends to invest at least 5% of its net assets in securities with a final maturity of 15 years within 90 days of the&#13;beginning of the calendar year. The Fund&amp;#8217;s portfolio is &amp;#8220;laddered&amp;#8221; by investing in municipal obligations with&#13;different final maturities so that some obligations age out of the five-to-fifteen year maturity range during each year.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The investment sub-adviser&amp;#8217;s process&#13;for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay&#13;the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment sub-adviser&#13;considers ratings assigned by rating agencies and generally performs additional credit and investment analysis. The portfolio managers&#13;may also trade securities to seek to minimize capital gains to shareholders. The portfolio managers may also consider financially&#13;material environmental, social and governance factors in evaluating an issuer. These considerations may be taken into account alongside&#13;other factors in the investment selection process.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund currently invests its assets in&#13;the Portfolio, a separate registered investment company with substantially the same investment objective and policies as the Fund,&#13;but may also invest directly in securities and other instruments.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:StrategyNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;Under normal market circumstances, the Fund&#13;invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal obligations (including notes&#13;and tax-exempt commercial paper) issued by or on behalf of states, territories and possessions of the United States and the District&#13;of Columbia and their political subdivisions, agencies or instrumentalities, the interest on which is exempt from regular federal&#13;income tax (the &amp;#8220;80% Policy&amp;#8221;). The Fund may invest without limit in obligations the income from which is subject to&#13;the federal alternative minimum tax. The Fund will primarily invest in &amp;#8220;high yield&amp;#8221; municipal obligations under normal&#13;market conditions. For this purpose, &amp;#8220;high yield&amp;#8221; municipal obligations are municipal obligations rated at the time&#13;of investment either Baa or lower by Moody&amp;#8217;s Investors Service, Inc. (&amp;#8220;Moody&amp;#8217;s&amp;#8221;), or BBB or lower by either&#13;S&amp;#38;P Global Ratings (&amp;#8220;S&amp;#38;P&amp;#8221;) or Fitch Ratings (&amp;#8220;Fitch&amp;#8221;) or, if unrated, determined by the investment&#13;adviser to be of comparable quality. &amp;#8220;High yield&amp;#8221; municipal obligations rated below investment grade are also known&#13;as &amp;#8220;junk bonds.&amp;#8221; The Fund may invest in securities in any rating category, including those in default. For purposes&#13;of rating restrictions, if securities are rated differently by two or more rating agencies, the lowest rating will be used for&#13;any Fund rating restrictions. The Fund may also invest a portion of its assets in municipal obligations that are not paying current&#13;income in anticipation of possible future income. The Fund may invest up to 20% of its net assets in other debt obligations, including&#13;(but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies&#13;and instrumentalities. The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts&#13;and options thereon, interest rate swaps, total return swaps, credit derivatives and forward rate contracts) for hedging purposes,&#13;to seek total return or as a substitute for the purchase or sale of securities. There is no stated limit on the Fund&amp;#8217;s use&#13;of derivatives. The portfolio manager may also consider financially material environmental, social and governance factors in evaluating&#13;an issuer. These considerations may be taken into account alongside other factors in the investment selection process.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;In pursuing its objective, the Fund normally&#13;acquires municipal obligations with maturities of ten years or more, but may acquire securities with shorter maturities. The Fund&amp;#8217;s&#13;portfolio often has a longer average maturity than is typical of many other funds that invest primarily in municipal obligations.&#13;As a result, the interest rate risk described below may be more significant for the Fund. The Fund may invest 25% or more of its&#13;total assets in certain types of municipal obligations (such as general obligations, municipal leases, principal only municipal&#13;investments, revenue bonds or industrial development bonds) and in one or more states, U.S. territories or economic sectors (such&#13;as housing, hospitals, healthcare facilities or utilities).&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The investment adviser&amp;#8217;s process for&#13;selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the&#13;obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers&#13;ratings assigned by rating agencies and generally performs additional credit and investment analysis. The portfolio manager also&#13;may trade securities to seek to minimize taxable capital gains to shareholders. A portion of the Fund&amp;#8217;s distributions generally&#13;will be subject to the federal alternative minimum tax.&amp;#160;&lt;i&gt;The Fund may not be suitable for investors subject to the federal&#13;alternative minimum tax.&lt;/i&gt;&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Principal Risks</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Principal Risks</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Principal Risks</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Principal Risks</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Principal Risks</rr:RiskHeading>
    <rr:RiskHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Principal Risks</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the&#13;ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such&#13;assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser&#13;and sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less&#13;well-developed and less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal&#13;obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which&#13;it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject&#13;to erratic price movements. The increased presence of nontraditional participants (such as proprietary trading desks of investment&#13;banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance&#13;companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade&#13;more frequently or in greater volume.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. The Fund may own individual investments&#13;that have longer durations. In a rising interest rate environment, the duration of income securities that have the ability to be&#13;prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing&#13;instruments may have to be reinvested at a lower interest rate. Certain instruments held by the Fund pay an interest rate based&#13;on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is the average offered rate for various maturities of short-term&#13;loans between certain major international banks. LIBOR is expected to be phased out by the end of 2021. While the effect of the&#13;phase out cannot yet be determined, it may result in, among other things, increased volatility or illiquidity in markets for instruments&#13;based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Money Market Instrument Risk.&lt;/b&gt;&amp;#160;Money&#13;market instruments may be adversely affected by market and economic events, such as a sharp rise in prevailing short-term interest&#13;rates; adverse developments in the banking industry, which issues or guarantees many money market instruments; adverse economic,&#13;political or other developments affecting issuers of money market instruments; changes in the credit quality of issuers; and default&#13;by a counterparty.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax-Sensitive Investing Risk.&lt;/b&gt;&amp;#160;The&#13;Fund may hold a security in order to achieve more favorable tax-treatment or to sell a security in order to create tax losses.&#13;The Fund&amp;#8217;s utilization of various tax-management techniques may be curtailed or eliminated by tax legislation, regulation&#13;or interpretations. The Fund may not be able to minimize taxable distributions to shareholders and a portion of the Fund&amp;#8217;s&#13;distributions may be taxable.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is not suited for short-term trading, and investors in the Fund should&#13;be able to tolerate potentially sharp declines in value over time. Purchase and redemption activities by Fund shareholders may&#13;impact the management of the Fund and its ability to achieve its investment objective(s). In addition, the redemption by one or&#13;more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders&#13;in the Fund. The Fund relies on various service providers, including the investment adviser, in its operations and is susceptible&#13;to operational, information security and related events (such as public health crises, cyber or hacking attacks) that may affect&#13;the service providers or the services that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is&#13;not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the&#13;ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such&#13;assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser&#13;and sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less&#13;well-developed and less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal&#13;obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which&#13;it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject&#13;to erratic price movements. The increased presence of nontraditional participants (such as proprietary trading desks of investment&#13;banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance&#13;companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade&#13;more frequently or in greater volume.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. In a rising interest rate environment,&#13;the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest&#13;rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain&#13;instruments held by the Fund pay an interest rate based on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is the&#13;average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is expected to&#13;be phased out by the end of 2021. While the effect of the phase out cannot yet be determined, it may result in, among other things,&#13;increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Money Market Instrument Risk.&lt;/b&gt;&amp;#160;Money&#13;market instruments may be adversely affected by market and economic events, such as a sharp rise in prevailing short-term interest&#13;rates; adverse developments in the banking industry, which issues or guarantees many money market instruments; adverse economic,&#13;political or other developments affecting issuers of money market instruments; changes in the credit quality of issuers; and default&#13;by a counterparty.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax-Sensitive Investing Risk.&lt;/b&gt;&amp;#160;The&#13;Fund may hold a security in order to achieve more favorable tax-treatment or to sell a security in order to create tax losses.&#13;The Fund&amp;#8217;s utilization of various tax-management techniques may be curtailed or eliminated by tax legislation, regulation&#13;or interpretations. The Fund may not be able to minimize taxable distributions to shareholders and a portion of the Fund&amp;#8217;s&#13;distributions may be taxable.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for&#13;short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp&#13;declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability&#13;to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders&#13;of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various&#13;service providers, including the investment adviser, in its operations and is susceptible to operational, information security&#13;and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services&#13;that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal&#13;Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments, which may impair the ability of the&#13;Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment&amp;#160;adviser&amp;#160;and&#13;sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed&#13;and less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal obligations&#13;at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be&#13;sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to&#13;erratic price movements. The increased presence of nontraditional participants (such as proprietary trading desks of investment&#13;banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance&#13;companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade&#13;more frequently or in greater volume.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. In a rising interest rate environment,&#13;the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest&#13;rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain&#13;instruments held by the Fund pay an interest rate based on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is the&#13;average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is expected to&#13;be phased out by the end of 2021. While the effect of the phase out cannot yet be determined, it may result in, among other things,&#13;increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for&#13;short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp&#13;declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability&#13;to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders&#13;of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various&#13;service providers, including the investment adviser, in its operations and is susceptible to operational, information security&#13;and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services&#13;that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal&#13;Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the&#13;ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such&#13;assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment&amp;#160;adviser&amp;#160;and&#13;sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed&#13;and less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal obligations&#13;at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be&#13;sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to&#13;erratic price movements. The increased presence of nontraditional participants (such as proprietary trading desks of investment&#13;banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance&#13;companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade&#13;more frequently or in greater volume.&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. In a rising interest rate environment,&#13;the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest&#13;rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain&#13;instruments held by the Fund pay an interest rate based on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is the&#13;average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is expected to&#13;be phased out by the end of 2021. While the effect of the phase out cannot yet be determined, it may result in, among other things,&#13;increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for&#13;short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp&#13;declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability&#13;to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders&#13;of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various&#13;service providers, including the investment adviser, in its operations and is susceptible to operational, information security&#13;and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services&#13;that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal&#13;Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the&#13;ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such&#13;assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment&amp;#160;adviser&amp;#160;and&#13;sub-adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed&#13;and less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal obligations&#13;at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be&#13;sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to&#13;erratic price movements. The increased presence of nontraditional participants (such as proprietary trading desks of investment&#13;banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance&#13;companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade&#13;more frequently or in greater volume.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. In a rising interest rate environment,&#13;the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest&#13;rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain&#13;instruments held by the Fund may pay an interest rate based on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is&#13;the average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is expected&#13;to be phased out by the end of 2021. While the effect of the phase out cannot yet be determined, it may result in, among other&#13;things, increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for&#13;short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp&#13;declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability&#13;to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders&#13;of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various&#13;service providers, including the investment adviser, in its operations and is susceptible to operational, information security&#13;and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services&#13;that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal&#13;Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:RiskNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;#160;The value of investments&#13;held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics&#13;or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. The frequency and&#13;magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience&#13;increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or&#13;fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could&#13;lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the&#13;ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such&#13;assets.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Municipal Obligations Risk.&lt;/b&gt;&amp;#160;The&#13;amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning&#13;that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser&#13;than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and&#13;less liquid than many other securities markets, which may limit the Fund&amp;#8217;s ability to sell its municipal obligations at attractive&#13;prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen&#13;during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements.&#13;The increased presence of nontraditional participants (such as proprietary trading desks of investment banks and hedge funds) or&#13;the absence of traditional participants (such as individuals, insurance companies, banks and life insurance companies) in the municipal&#13;markets may lead to greater volatility in the markets because non-traditional participants may trade more frequently or in greater&#13;volume.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;#160;In general,&#13;the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase&#13;when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income&#13;security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer&#13;durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing&#13;them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may&#13;provide lower returns than fixed-income securities with longer durations or maturities. Because the Fund is managed toward an income&#13;objective, it may hold more longer duration or 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.&amp;#160;In a rising interest rate environment, the duration&#13;of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate&#13;environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain instruments&#13;held by the Fund may pay an interest rate based on the London Interbank Offered Rate (&amp;#8220;LIBOR&amp;#8221;), which is the average&#13;offered rate for various maturities of short-term loans between certain major international banks. LIBOR is expected to be phased&#13;out by the end of 2021. While the effect of the phase out cannot yet be determined, it may result in, among other things, increased&#13;volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;#160;Investments in&#13;municipal obligations and other debt obligations (referred to below as &amp;#8220;debt instruments&amp;#8221;) are subject to the risk&#13;of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity&#13;of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments&#13;and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because&#13;of concerns about the issuer&amp;#8217;s ability to make principal and interest payments. In addition, the credit ratings of debt instruments&#13;may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.&#13;In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal&#13;or similar counsel, which may increase the Fund&amp;#8217;s operating expenses and adversely affect net asset value. Municipal obligations&#13;may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded&#13;by a rating agency, the value of such obligations may be negatively affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Lower Rated Investments Risk.&lt;/b&gt;&amp;#160;Investments&#13;rated below investment grade and comparable unrated investments (sometimes referred to as &amp;#8220;junk&amp;#8221;) have speculative&#13;characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances&#13;typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than&#13;they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower&#13;rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price&#13;volatility and illiquidity than higher rated investments.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt;&amp;#160;The Fund&amp;#8217;s&#13;exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in&#13;securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value&#13;of the security, instrument, index, currency, commodity, economic indicator or event underlying a derivative (&amp;#8220;reference&#13;instrument&amp;#8221;), due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in&#13;the Fund, which represents a non-cash exposure to the underlying reference instrument. Leverage can increase both the risk and&#13;return potential of the Fund. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute&#13;for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves&#13;the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior&#13;or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the&#13;underlying reference instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid,&#13;and may be subject to wide swings in valuation caused by changes in the value of the underlying reference instrument. If a derivative&amp;#8217;s&#13;counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the&#13;return of collateral or other assets held by the counterparty. The loss on derivative transactions may substantially exceed the&#13;initial investment, particularly when there is no stated limit on the Fund&amp;#8217;s use of derivatives. A derivative investment&#13;also involves the risks relating to the reference instrument underlying the investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risk of Residual Interest Bonds.&lt;/b&gt;&amp;#160;The&#13;Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment&#13;in a fixed-rate municipal bond. 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. The value and market for residual&#13;interest bonds are volatile and such bonds may have limited liquidity. As required by applicable accounting standards, the Fund&#13;records interest expense as a liability with respect to floating-rate notes and also records offsetting interest income in an amount&#13;equal to this expense.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Leverage Risk.&lt;/b&gt;&amp;#160;Certain Fund&#13;transactions may give rise to leverage. Leverage can result from a non-cash exposure to the underlying reference instrument. Leverage&#13;can increase both the risk and return potential of the Fund. The Fund is required to segregate liquid assets or otherwise cover&#13;the Fund&amp;#8217;s obligation created by a transaction that may give rise to leverage. The use of leverage may cause the Fund to&#13;liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.&#13;Leverage may cause the Fund&amp;#8217;s share price to be more volatile than if it had not been leveraged, as certain types of leverage&#13;may exaggerate the effect of any increase or decrease in the value of the Fund&amp;#8217;s portfolio securities. The loss on leveraged&#13;investments may substantially exceed the initial investment.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Sector and Geographic Risk.&lt;/b&gt;&amp;#160;Because&#13;the Fund may invest a significant portion of its assets in obligations issued in one or more states and/or U.S. territories and&#13;in certain types of municipal obligations and/or in certain sectors, the value of Fund shares may be affected by events that adversely&#13;affect a state, U.S. territory, sector or type of obligation and may fluctuate more than that of a more broadly diversified fund.&#13;General obligation bonds issued by municipalities are adversely affected by economic downturns and any resulting decline in tax&#13;revenues.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks of Principal Only Investments.&lt;/b&gt;&amp;#160;Principal&#13;only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal&#13;only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest&#13;currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell&#13;other investments to obtain cash needed for such income distributions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&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. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality&#13;and market liquidity.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;#160;The Fund is&#13;exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions,&#13;or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently,&#13;the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments&#13;to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund&amp;#8217;s performance.&#13;These effects may be exacerbated during times of financial or political stress.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Tax Risk.&lt;/b&gt;&amp;#160;Income from tax-exempt&#13;municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant taxing&#13;authority or the non-compliant conduct of the issuer of an obligation.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;&lt;b&gt;Risks Associated with Active Management.&lt;/b&gt;&amp;#160;The&#13;success of the Fund&amp;#8217;s investment strategy depends on portfolio management&amp;#8217;s successful application of analytical skills&#13;and investment judgment. Active management involves subjective decisions.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;b&gt;General Fund Investing Risks.&amp;#160;&lt;/b&gt;The&#13;Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is&#13;possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for&#13;short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp&#13;declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability&#13;to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders&#13;of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various&#13;service providers, including the investment adviser, in its operations and is susceptible to operational, information security&#13;and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services&#13;that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal&#13;Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Performance</rr:BarChartAndPerformanceTableHeading>
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    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:BarChartAndPerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The following bar chart and table provide&#13;some indication of the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and&#13;how the Fund&amp;#8217;s average annual returns over time compare with those of two broad-based securities market indices.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-align: justify"&gt;The Fund commenced operations on March 27,&#13;2009 and is the successor to the operations of a private limited partnership (the &amp;#8220;Predecessor Account&amp;#8221;). The performance&#13;of each Class for the period prior to March 27, 2009 is that of the Predecessor Account. The Predecessor Account was managed by&#13;Eaton Vance and had substantially the same investment objective, policies and strategies as the Fund. However, the Predecessor&#13;Account was not a mutual fund registered under the Investment Company Act of 1940, as amended (the &amp;#8220;1940 Act&amp;#8221;) or a&#13;regulated investment company under the Internal Revenue Code of 1986, as amended (the &amp;#8220;Code&amp;#8221;), and therefore the Predecessor&#13;Account was not subject to the investment limitations, diversification requirements and other restrictions imposed by the 1940&#13;Act and/or the Code. If such requirements were applicable to the Predecessor Account, the performance shown may have been adversely&#13;affected.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The returns in the bar chart reflect the&#13;effects of expense reductions. Absent these reductions, performance for certain periods would have been lower. Effective February&#13;17, 2015, the Fund changed its name, objective and 80% Policy and may not have achieved the performance results shown for the period&#13;prior to February 17, 2015 under its current investment objective and strategy. Past performance (both before and after taxes)&#13;is not necessarily an indication of how the Fund will perform in the future. Updated Fund performance information can be obtained&#13;by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0pt 0 6pt; text-align: justify"&gt;The following bar chart and table provide some indication of&#13;the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and how the Fund&amp;#8217;s&#13;average annual returns over time compare with those of two broad-based securities market indices. The returns in the bar chart&#13;are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance&#13;(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund&amp;#8217;s performance&#13;reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0pt 0 6pt; text-align: justify"&gt;The following bar chart and table provide some indication of&#13;the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and how the Fund&amp;#8217;s&#13;average annual returns over time compare with those of a broad-based securities market index. The returns in the bar chart are&#13;for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance&#13;(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund&amp;#8217;s performance&#13;reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0pt 0 6pt; text-align: justify"&gt;The following bar chart and table provide some indication of&#13;the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and how the Fund&amp;#8217;s&#13;average annual returns over time compare with those of a broad-based securities market index. The returns in the bar chart are&#13;for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance&#13;(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund&amp;#8217;s performance&#13;reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0pt 0 6pt; text-align: justify"&gt;The following bar chart and table provide some indication of&#13;the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and how the Fund&amp;#8217;s&#13;average annual returns over time compare with those of two broad-based securities market indices. The returns in the bar chart&#13;are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance&#13;(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund&amp;#8217;s performance&#13;reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceNarrativeTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0pt 0 6pt; text-align: justify"&gt;The following bar chart and table provide some indication of&#13;the risks of investing in the Fund by showing changes in the Fund&amp;#8217;s performance from year to year and how the Fund&amp;#8217;s&#13;average annual returns over time compare with those of two broad-based securities market indices. The returns in the bar chart&#13;are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance&#13;(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated Fund performance&#13;information can be obtained by visiting www.eatonvance.com.&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
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    <rr:BarChartTableTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/BarChartData column period compact * column dei_LegalEntityAxis compact evmtii_S000027034Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
    <rr:BarChartTableTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/BarChartData column period compact * column dei_LegalEntityAxis compact evmtii_S000004834Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;For the ten years ended December 31, 2019, the highest quarterly&#13;total return for the Fund or Predecessor Account was 2.24% for the quarter ended June 30, 2011, and the lowest quarterly return&#13;for the Fund or Predecessor Account was -2.36% for the quarter ended December 31, 2016. The year-to-date total return through the&#13;end of the most recent calendar quarter (December 31, 2019 to March 31, 2020) was 1.64%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;During the period from December 31, 2010 to December 31, 2019,&#13;the highest quarterly total return for Class A was 3.75% for the quarter ended June 30, 2011, and the lowest quarterly return was&#13;-4.07% for the quarter ended December 31, 2016. The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2019 to March 31, 2020) was 0%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;During the period from December 31, 2015 to December 31, 2019,&#13;the highest quarterly total return for Class A was 2.03% for the quarter ended March 31, 2019, and the lowest quarterly return&#13;was -2.89% for the quarter ended December 31, 2016. The year-to-date return through the end of the most recent calendar quarter&#13;(December 31, 2019 to March 31, 2020) was -0.87%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;During the period from December 31, 2015 to December 31, 2019,&#13;the highest quarterly total return for Class A was 4.08% for the quarter ended June 30, 2016, and the lowest quarterly return was&#13;-5.41% for the quarter ended December 31, 2016. The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2019 to March 31, 2020) was -0.17%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;During the period from December 31, 2010 to December 31, 2019,&#13;the highest quarterly total return for Class A was 5.14% for the quarter ended March 31, 2014, and the lowest quarterly return&#13;was -5.10% for the quarter ended June 30, 2013. The year-to-date total return through the end of the most recent calendar quarter&#13;(December 31, 2019 to March 31, 2020) was -0.43%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:BarChartClosingTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 3pt 0; text-align: justify"&gt;For the ten years ended December 31,&#13;2019, the highest quarterly total return for Class A was 6.32% for the quarter ended March 31, 2014, and the lowest quarterly&#13;return was -6.99% for the quarter ended December 31, 2010. The year-to-date total return through the end of the most recent calendar&#13;quarter (December 31, 2019 to March 31, 2020) was -3.71%.&lt;/p&gt;</rr:BarChartClosingTextBlock>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000024906Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000027033Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000049164Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000049165Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000027034Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
    <rr:PerformanceTableHeading contextRef="AsOf2020-05-29_custom_S000004834Member">Average Annual Total Return as of December 31, 2019</rr:PerformanceTableHeading>
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    <rr:PerformanceTableTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;div style="display: none"&gt;~ http://eatonvance.com/role/PerformanceTableData column period compact * column dei_LegalEntityAxis compact evmtii_S000004834Member column rr_ProspectusShareClassAxis compact * row primary compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000024906Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (2.25%) and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;) for Class C. Effective September&#13;30, 2019, the Fund changed its primary benchmark from Bloomberg Barclays 5 Year Municipal Bond Index to Bloomberg Barclays Municipal&#13;Managed Money 1-7 Year Bond Index because the investment adviser believes that the Bloomberg Barclays Municipal Managed Money 1-7&#13;Year Bond Index better reflects the duration and maturity profile of the investments held by the Fund. The performance shown above&#13;for each Class for the period prior to March 27, 2009 (commencement of operations) is that of the Predecessor Account adjusted&#13;to reflect any applicable sales charge or CDSC of the Class but not adjusted for any other differences in expenses among the Classes.&#13;If adjusted for such differences, returns would be different. Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 3pt 0; text-align: justify"&gt;After-Tax Return is calculated using&#13;the highest historical individual federal income tax rates and does not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the actual characterization of distributions, and may differ from those&#13;shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable&#13;entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than&#13;or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the&#13;sale of Fund shares. After-Tax Returns are not shown for the Ten Years ended December 31, 2018 because the Predecessor Account,&#13;unlike a registered investment company, was not required to make annual income distributions to its investors.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000027033Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (4.75%) effective December 2, 2019 and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;)&#13;for Class C. Class A, Class C and Class I commenced operations on February 1, 2010. Effective February 17, 2015, the Fund changed&#13;its name, objective and investment strategy to invest at least 80% of its net assets in a diversified portfolio of municipal obligations,&#13;the interest on which is exempt from regular federal income tax. Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After-tax returns are calculated using&#13;the highest historical individual federal income tax rates and does not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the actual characterization of distributions, and may differ from those&#13;shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable&#13;entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than&#13;or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the&#13;sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000049164Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (2.25%) effective December 19, 2019 and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;)&#13;for Class C. Class A, Class C and Class I commenced operations on May 4, 2015. Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After-tax returns are calculated using&#13;the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the actual characterization of distributions, and may differ from those&#13;shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable&#13;entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than&#13;or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the&#13;sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000049165Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (4.75%) and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;) for Class C. Class A, Class&#13;C and Class I commenced operations on May 4, 2015. Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After-tax returns are calculated using&#13;the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the actual characterization of distributions, and may differ from those&#13;shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable&#13;entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than&#13;or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the&#13;sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (4.75%) and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;) for Class C. Class A, Class&#13;C and Class I commenced operations on February 1, 2010. Effective April 15, 2015, the Fund changed its name, investment objective&#13;and investment strategy to invest at least 80% of its net assets in municipal obligations with final maturities of between five&#13;and fifteen years, the interest on which is exempt from regular federal income tax. Investors cannot invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After-tax returns are calculated using&#13;the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the actual characterization of distributions, and may differ from those&#13;shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable&#13;entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than&#13;or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the&#13;sale of Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:PerformanceTableClosingTextBlock contextRef="AsOf2020-05-29_custom_S000004834Member">&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0 0 3pt; text-align: justify"&gt;These returns reflect the maximum sales&#13;charge for Class A (4.75%) and any applicable contingent deferred sales charge (&amp;#8220;CDSC&amp;#8221;) for Class C. Investors cannot&#13;invest directly in an Index.&lt;/p&gt;&#13;&#13;&lt;p style="font: 8pt/10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;After-tax returns are calculated using&#13;the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax&#13;returns depend on a shareholder&amp;#8217;s tax situation and the characterization of distributions, and may differ from those shown.&#13;After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.&#13;After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. 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. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal&#13;to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of&#13;Fund shares.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
    <rr:ExpenseFootnotesTextBlock contextRef="AsOf2020-05-29_custom_S000027034Member">&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;Expenses in the table above and the Example below reflect the&#13;expenses of the Fund and 5-to-15 Year Laddered Municipal Bond Portfolio (the &amp;#8220;Portfolio&amp;#8221;), the Fund&amp;#8217;s master&#13;Portfolio.&lt;/p&gt;</rr:ExpenseFootnotesTextBlock>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0100</rr:MaximumDeferredSalesChargeOverOther>
    <rr:MaximumDeferredSalesChargeOverOther contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0000</rr:MaximumDeferredSalesChargeOverOther>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000024906Member_custom_C000074079Member" unitRef="Ratio" decimals="INF">0.0399</rr:AnnualReturn2019>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000027033Member_custom_C000081345Member" unitRef="Ratio" decimals="INF">0.0611</rr:AnnualReturn2019>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000049164Member_custom_C000154967Member" unitRef="Ratio" decimals="INF">0.0489</rr:AnnualReturn2019>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000049165Member_custom_C000154970Member" unitRef="Ratio" decimals="INF">0.0981</rr:AnnualReturn2019>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000027034Member_custom_C000081348Member" unitRef="Ratio" decimals="INF">0.0661</rr:AnnualReturn2019>
    <rr:AnnualReturn2019 contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0933</rr:AnnualReturn2019>
    <rr:Component1OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0013</rr:Component1OtherExpensesOverAssets>
    <rr:Component1OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0013</rr:Component1OtherExpensesOverAssets>
    <rr:Component1OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0013</rr:Component1OtherExpensesOverAssets>
    <rr:Component2OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013069Member" unitRef="Ratio" decimals="INF">0.0009</rr:Component2OtherExpensesOverAssets>
    <rr:Component2OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000013071Member" unitRef="Ratio" decimals="INF">0.0009</rr:Component2OtherExpensesOverAssets>
    <rr:Component2OtherExpensesOverAssets contextRef="AsOf2020-05-29_custom_S000004834Member_custom_C000048637Member" unitRef="Ratio" decimals="INF">0.0009</rr:Component2OtherExpensesOverAssets>
    <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
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      <link:loc xlink:type="locator" xlink:href="#Foot-01-0" xlink:label="Foot-01_loc" />
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      <link:loc xlink:type="locator" xlink:href="#Foot-02-1" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-2" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-3" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-4" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-5" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-6" xlink:label="Foot-02_loc" />
      <link:loc xlink:type="locator" xlink:href="#Foot-02-7" xlink:label="Foot-02_loc" />
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      <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Foot-03_loc" xlink:to="Footnote-04" order="1" />
      <link:footnote xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:label="Footnote-01" xml:lang="en-US">"Management Fees" reflect a fee reduction agreement to the Fund's investment advisory and administrative agreement effective May 1, 2020, and "Management Fees" have been restated to reflect the fees as if the Fund's revised investment advisory and administrative fee was in effect for the Fund's full fiscal year ended January 31, 2020.</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 investment adviser, sub-adviser and administrator have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.90% for Class A shares, 1.65% for Class C shares and 0.65% for Class I shares. This expense reimbursement will continue through May 31, 2021. Any amendment to or termination of this reimbursement would require 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 of unaffiliated funds, borrowing costs (including borrowing costs of any acquired funds), taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser, sub-adviser and administrator during the same 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">The investment adviser and administrator and sub-adviser have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.65% for Class A shares, 1.40% for Class C shares and 0.40% for Class I shares. This expense reimbursement will continue through May 31, 2021. Any amendment to or termination of this reimbursement would require 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 of unaffiliated funds, borrowing costs (including borrowing costs of any acquired funds), taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator and sub-adviser during the same 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-04" xml:lang="en-US">Expenses in the table above and the Example below reflect the expenses of the Fund and 5-to-15 Year Laddered Municipal Bond Portfolio (the "Portfolio"), the Fund's master Portfolio.</link:footnote>
    </link:footnoteLink>
</xbrli:xbrl>
