| Label |
Element |
Value |
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Central Index Key |
dei_EntityCentralIndexKey |
0000914529
|
| Eaton Vance High Yield Municipal Income Fund |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Investment Objective, Heading |
rr_ObjectiveHeading |
Investment Objective
|
| Investment Objective, Primary |
rr_ObjectivePrimaryTextBlock |
The Fund’s investment objective is to provide high current income exempt from regular federal income tax.
|
| Expense, Heading |
rr_ExpenseHeading |
Fees and Expenses of the Fund
|
| Expense, Narrative |
rr_ExpenseNarrativeTextBlock |
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Investors may also pay
commissions or other fees to their financial intermediary when they buy and hold shares of the Fund, which are not reflected
below. You may qualify for a reduced sales charge on purchases of Class 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 also may offer variations in Fund
sales charges to their customers as described in Appendix A – Financial Intermediary Sales Charge Variations in this
Prospectus. More information about these and other discounts is available from your financial intermediary and in Sales Charges
beginning on page 16 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.
|
| Shareholder Fees, Caption |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment)
|
| Operating Expenses, Caption |
rr_OperatingExpensesCaption |
Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)
|
| Portfolio Turnover, Heading |
rr_PortfolioTurnoverHeading |
Portfolio Turnover
|
| Portfolio Turnover |
rr_PortfolioTurnoverTextBlock |
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).
A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are
held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect
the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 21% of the average
value of its portfolio.
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
21.00%
|
| Expense Breakpoint, Discounts |
rr_ExpenseBreakpointDiscounts |
You may qualify
for a reduced sales charge on purchases of Class 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 also may offer variations in Fund sales charges to their customers as described
in Appendix A – Financial Intermediary Sales Charge Variations in this Prospectus. More information about these and other
discounts is available from your financial intermediary and in Sales Charges beginning on page 16 of this Prospectus and page
20 of the Fund’s Statement of Additional Information.
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
$ 50,000
|
| Expense Example, Heading |
rr_ExpenseExampleHeading |
Example.
|
| Expense Example, Narrative |
rr_ExpenseExampleNarrativeTextBlock |
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your
shares at the end of those periods. The Example also assumes that your investment has a 5% return each year, that the operating
expenses remain the same and that any expense reimbursement arrangement remains in place for the contractual period. Although
your actual costs may be higher or lower, based on these assumptions your costs would be:
|
| Investment Strategy, Heading |
rr_StrategyHeading |
Principal Investment Strategies
|
| Investment Strategy, Narrative |
rr_StrategyNarrativeTextBlock |
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 “80% Policy”). 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 “high yield” municipal obligations under
normal market conditions. For this purpose, “high yield” municipal obligations are municipal obligations rated at the
time of investment either Baa or lower by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or lower
by either S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”) or, if unrated, determined by the
investment adviser to be of comparable quality. “High yield” municipal obligations rated below investment grade are
also known as “junk bonds.” 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, 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’s use of derivatives.
In pursuing its objective, the Fund
normally acquires municipal obligations with maturities of ten years or more, but may acquire securities with shorter maturities.
The Fund’s portfolio often has a longer average maturity than is typical of many other funds that invest primarily in municipal
obligations. 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 total assets in certain types of municipal obligations (such as general obligations, municipal leases, principal
only municipal investments, revenue bonds and industrial development bonds) and in one or more states, territories or economic
sectors (such as housing, hospitals, healthcare facilities or utilities).
The investment adviser’s process
for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay
the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers
ratings assigned by rating agencies and generally performs additional credit and investment analysis. The portfolio manager also
may trade securities to seek to minimize taxable capital gains to shareholders. A portion of the Fund’s distributions generally
will be subject to the federal alternative minimum tax. The Fund may not be suitable for investors subject to the federal
alternative minimum tax.
|
| Strategy Portfolio Concentration |
rr_StrategyPortfolioConcentration |
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 “80% Policy”). 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 “high yield” municipal obligations under normal market conditions. For this purpose, “high
yield” municipal obligations are municipal obligations rated at the time of investment either Baa or lower by Moody’s
Investors Service, Inc. (“Moody’s”), or BBB or lower by either S&P Global Ratings (“S&P”)
or Fitch Ratings (“Fitch”) or, if unrated, determined by the investment adviser to be of comparable quality. “High
yield” municipal obligations rated below investment grade are also known as “junk bonds.” 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, 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’s use of derivatives.
|
| Risk, Heading |
rr_RiskHeading |
Principal Risks
|
| Risk, Narrative |
rr_RiskNarrativeTextBlock |
Market Risk. The value
of investments held by the Fund may increase or decrease in response to economic, political and financial events (whether real,
expected or perceived) in the U.S. and global markets. The frequency and magnitude of such changes in value cannot be predicted.
Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially
adverse effects in reaction to changing market conditions. Actions taken by the U.S. Federal Reserve or foreign central banks to
stimulate or stabilize economic growth, such as decreases or increases in short-term interest rates, could cause high volatility
in markets. No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to
realize the current valuation of such investments in the event of the need to liquidate such assets. Fixed-income markets may experience
periods of relatively high volatility in an environment where U.S. treasury yields are rising.
Municipal Obligation Risk. The
amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning
that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser
than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and
less liquid than many other securities markets, which may limit the Fund’s ability to sell its municipal obligations at attractive
prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen
during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements.
The increased presence of nontraditional participants (such as proprietary trading desks of investment banks and hedge funds) or
the absence of traditional participants (such as individuals, insurance companies, banks and life insurance companies) in the municipal
markets may lead to greater volatility in the markets because non-traditional participants may trade more frequently or in greater
volume.
Interest Rate Risk. In
general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely
to increase when interest rates fall and decline when interest rates rise. Generally, securities with longer durations or maturities
are more sensitive to changes in interest rates than shorter duration or maturity securities, causing them to be more volatile.
Conversely, fixed income securities with shorter durations or maturities will be less volatile but may provide lower returns than
fixed income securities with longer durations or maturities. Because the Fund is managed toward an income objective, it may hold
more longer duration or maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that
are managed with a greater emphasis on total return. In a rising interest rate environment, the durations or maturities of income
securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment,
the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.
Credit Risk. Investments
in municipal obligations and other debt obligations (referred to below as “debt instruments”) are subject to the risk
of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity
of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments
and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because
of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments
may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates.
In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal
or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value. Municipal obligations
may be insured as to principal and interest payments. If the claims-paying ability or other rating of the insurer is downgraded
by a rating agency, the value of such obligations may be negatively affected.
Lower Rated Investments Risk. Investments
rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) have speculative
characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances
typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than
they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower
rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price
volatility and illiquidity than higher rated investments.
Derivatives Risk. The
Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing
directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price
or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory
constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying asset, index,
rate or instrument. Leverage can increase both the risk and return potential of the Fund. Derivatives risk may be more significant
when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the
risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction
may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including
one used for hedging) may not correlate perfectly with the underlying asset, rate, index or instrument. Derivative instruments
traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused
by changes in the value of the underlying instrument. If a derivative’s counterparty is unable to honor its commitments,
the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the
counterparty. The loss on derivative transactions may substantially exceed the initial investment, particularly when there is no
stated limit on the Fund’s use of derivatives. A derivative investment also involves the risks relating to the asset, index,
rate or instrument underlying the investment.
Leverage Risk. Certain
fund transactions may give rise to leverage. Leverage can result from a non-cash exposure to an asset, index, rate or instrument.
Leverage can increase both the risk and return potential of the Fund. The Fund is required to segregate liquid assets or otherwise
cover the Fund’s obligation created by a transaction that may give rise to leverage. The use of leverage may cause the Fund
to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.
Leverage may cause the Fund’s share price to be more volatile than if it had not been leveraged, as certain types of leverage
may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities. The loss on leveraged
investments may substantially exceed the initial investment.
Risk of Residual Interest Bonds. The
Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment
in a fixed-rate municipal bond. The interest payments that the Fund receives on the residual interest bonds acquired in such transactions
vary inversely with short-term interest rates, normally decreasing when short-term rates increase. The value and market for residual
interest bonds are volatile and such bonds may have limited liquidity. As required by applicable accounting standards, the Fund
records interest expense as a liability with respect to floating-rate notes and also records offsetting interest income in an amount
equal to this expense.
Sector and Geographic Risk. Because
the Fund may invest a significant portion of its assets in a state and/or U.S. territory and in certain types of municipal obligations
and/or in certain sectors, the value of Fund shares may be affected by events that adversely affect a state, U.S. territory, sector
or type of obligation and may fluctuate more than that of a fund that invests more broadly. General obligation bonds issued by
municipalities are adversely affected by economic downturns and any resulting decline in tax revenues. The Commonwealth of Puerto
Rico and its related issuers continue to experience financial difficulties and rating agency downgrades, and numerous issuers have
entered Title III of the Puerto Rico Oversight, Management and Economic Stability Act, which is similar to bankruptcy protection,
through which the Commonwealth of Puerto Rico can restructure its debt. Puerto Rico's short-term financial difficulties were further
impacted by a hurricane in 2017. See “Credit Risk” and “Lower Rated Investments Risk” above.
Risks of Principal Only Investments. Principal
only investments entitle the Fund to receive the stated value of such investment when held to maturity. The values of principal
only investments are subject to greater fluctuation in response to changes in market interest rates than obligations that pay interest
currently. The Fund will accrue income on these investments and distribute that income each year. The Fund may be required to sell
other investments to obtain cash needed for such income distributions.
U.S. Government Securities Risk. Although
certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage
Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S.
Treasury. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality
and market liquidity.
Tax Risk. Income from
tax-exempt municipal obligations could be declared taxable because of changes in tax laws, adverse interpretations by the relevant
taxing authority or the non-compliant conduct of the issuer of an obligation.
Risks Associated with Active Management. The
success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills
and investment judgment. Active management involves subjective decisions.
General Fund Investing Risks. 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. The Fund is designed to be a long-term investment vehicle and is not suited for
short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp
declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability
to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders
of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. 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.
|
| Risk, Lose Money |
rr_RiskLoseMoney |
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.
|
| Risk, Not Insured Depository Institution |
rr_RiskNotInsuredDepositoryInstitution |
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.
|
| Bar Chart and Performance Table, Heading |
rr_BarChartAndPerformanceTableHeading |
Performance
|
| Performance, Narrative |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table
provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to
year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.
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. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform
in the future. Updated Fund performance information can be obtained by visiting www.eatonvance.com.
|
| Performance, Information Illustrates Variability of Returns |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following
bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance
from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market
indices.
|
| Performance Availability Website Address |
rr_PerformanceAvailabilityWebSiteAddress |
www.eatonvance.com
|
| Performance Past Does Not Indicate Future |
rr_PerformancePastDoesNotIndicateFuture |
Past performance
(both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
|
| Bar Chart Does Not Reflect Sales Loads |
rr_BarChartDoesNotReflectSalesLoads |
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.
|
| Bar Chart, Closing |
rr_BarChartClosingTextBlock |
For the ten years ended December 31, 2017, the highest quarterly total return for Class A was 16.76% for the quarter ended
September 30, 2009, and the lowest quarterly return was -27.80% for the quarter ended December 31, 2008. The year-to-date
total return through the end of the most recent calendar quarter (December 31, 2017 to March 31, 2018) was -0.94%.
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
The year-to-date
total return through the end of the most recent calendar quarter (December 31, 2017 to March 31, 2018) was
|
| Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Mar. 31, 2018
|
| Year to Date Return |
rr_BarChartYearToDateReturn |
(0.94%)
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
For the ten
years ended December 31, 2017, the highest quarterly total return for Class A was
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Sep. 30, 2009
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
16.76%
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
and the lowest
quarterly return was
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Dec. 31, 2008
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(27.80%)
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual Total Return as of December 31, 2017
|
| Performance Table Does Reflect Sales Loads |
rr_PerformanceTableDoesReflectSalesLoads |
These returns
reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”)
for Class B and Class C.
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
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’s tax situation and the characterization of distributions,
and may differ from those shown.
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
After-tax
returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.
|
| Performance Table One Class of after Tax Shown |
rr_PerformanceTableOneClassOfAfterTaxShown |
After-tax
returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.
|
| Performance Table Explanation after Tax Higher |
rr_PerformanceTableExplanationAfterTaxHigher |
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 After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.
|
| Performance Table, Closing |
rr_PerformanceTableClosingTextBlock |
These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”)
for Class B and Class C. Investors cannot invest directly in an Index.
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’s tax situation and the characterization
of distributions, and may differ from those shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred
accounts or to shares held by non-taxable entities. After-tax returns for other Classes of shares will vary from the after-tax
returns presented for Class A shares. 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 After Taxes on Distributions for the same period because
of losses realized on the sale of Fund shares.
|
| Eaton Vance High Yield Municipal Income Fund | Bloomberg Barclays Municipal Bond Index |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Index No Deduction for Fees, Expenses, Taxes |
rr_IndexNoDeductionForFeesExpensesTaxes |
(reflects
no deduction for fees, expenses or taxes)
|
| One Year |
rr_AverageAnnualReturnYear01 |
5.45%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
3.02%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
4.45%
|
| Eaton Vance High Yield Municipal Income Fund | Bloomberg Barclays High Yield Long (22+) Municipal Bond Index |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Index No Deduction for Fees, Expenses, Taxes |
rr_IndexNoDeductionForFeesExpensesTaxes |
(reflects
no deduction for fees, expenses or taxes)
|
| One Year |
rr_AverageAnnualReturnYear01 |
13.32%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
5.60%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
6.32%
|
| Eaton Vance High Yield Municipal Income Fund | Class A |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
4.75%
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption) |
rr_MaximumDeferredSalesChargeOverOther |
none
|
| Management Fees |
rr_ManagementFeesOverAssets |
0.43%
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25%
|
| Interest Expense |
rr_Component1OtherExpensesOverAssets |
0.14%
|
| Expenses other than Interest Expense |
rr_Component2OtherExpensesOverAssets |
0.10%
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.24%
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.92%
|
| 1 Year |
rr_ExpenseExampleYear01 |
$ 564
|
| 3 Years |
rr_ExpenseExampleYear03 |
754
|
| 5 Years |
rr_ExpenseExampleYear05 |
960
|
| 10 Years |
rr_ExpenseExampleYear10 |
1,553
|
| 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
564
|
| 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
754
|
| 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
960
|
| 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,553
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
(37.00%)
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
44.98%
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
2.39%
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
11.64%
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
15.38%
|
| Annual Return 2013 |
rr_AnnualReturn2013 |
(5.57%)
|
| Annual Return 2014 |
rr_AnnualReturn2014 |
18.08%
|
| Annual Return 2015 |
rr_AnnualReturn2015 |
4.81%
|
| Annual Return 2016 |
rr_AnnualReturn2016 |
1.14%
|
| Annual Return 2017 |
rr_AnnualReturn2017 |
7.95%
|
| One Year |
rr_AverageAnnualReturnYear01 |
2.85%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
3.97%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
3.88%
|
| Eaton Vance High Yield Municipal Income Fund | Class A | After Taxes on Distributions |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| One Year |
rr_AverageAnnualReturnYear01 |
2.71%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
3.86%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
3.81%
|
| Eaton Vance High Yield Municipal Income Fund | Class A | After Taxes on Distributions and Sales |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| One Year |
rr_AverageAnnualReturnYear01 |
3.11%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
3.91%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
3.94%
|
| Eaton Vance High Yield Municipal Income Fund | Class B |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption) |
rr_MaximumDeferredSalesChargeOverOther |
5.00%
|
| Management Fees |
rr_ManagementFeesOverAssets |
0.43%
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00%
|
| Interest Expense |
rr_Component1OtherExpensesOverAssets |
0.14%
|
| Expenses other than Interest Expense |
rr_Component2OtherExpensesOverAssets |
0.10%
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.24%
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.67%
|
| 1 Year |
rr_ExpenseExampleYear01 |
$ 670
|
| 3 Years |
rr_ExpenseExampleYear03 |
926
|
| 5 Years |
rr_ExpenseExampleYear05 |
1,107
|
| 10 Years |
rr_ExpenseExampleYear10 |
1,777
|
| 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
170
|
| 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
526
|
| 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
907
|
| 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,777
|
| One Year |
rr_AverageAnnualReturnYear01 |
2.17%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
3.87%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
3.61%
|
| Eaton Vance High Yield Municipal Income Fund | Class C |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption) |
rr_MaximumDeferredSalesChargeOverOther |
1.00%
|
| Management Fees |
rr_ManagementFeesOverAssets |
0.43%
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00%
|
| Interest Expense |
rr_Component1OtherExpensesOverAssets |
0.14%
|
| Expenses other than Interest Expense |
rr_Component2OtherExpensesOverAssets |
0.10%
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.24%
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.67%
|
| 1 Year |
rr_ExpenseExampleYear01 |
$ 270
|
| 3 Years |
rr_ExpenseExampleYear03 |
526
|
| 5 Years |
rr_ExpenseExampleYear05 |
907
|
| 10 Years |
rr_ExpenseExampleYear10 |
1,976
|
| 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
170
|
| 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
526
|
| 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
907
|
| 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,976
|
| One Year |
rr_AverageAnnualReturnYear01 |
6.22%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
4.23%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
3.62%
|
| Eaton Vance High Yield Municipal Income Fund | Class I |
|
|
| Risk/Return: |
rr_RiskReturnAbstract |
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption) |
rr_MaximumDeferredSalesChargeOverOther |
none
|
| Management Fees |
rr_ManagementFeesOverAssets |
0.43%
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
| Interest Expense |
rr_Component1OtherExpensesOverAssets |
0.14%
|
| Expenses other than Interest Expense |
rr_Component2OtherExpensesOverAssets |
0.10%
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.24%
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.67%
|
| 1 Year |
rr_ExpenseExampleYear01 |
$ 68
|
| 3 Years |
rr_ExpenseExampleYear03 |
214
|
| 5 Years |
rr_ExpenseExampleYear05 |
373
|
| 10 Years |
rr_ExpenseExampleYear10 |
835
|
| 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
68
|
| 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
214
|
| 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
373
|
| 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 835
|
| One Year |
rr_AverageAnnualReturnYear01 |
8.22%
|
| Five Years |
rr_AverageAnnualReturnYear05 |
5.25%
|
| Ten Years |
rr_AverageAnnualReturnYear10 |
4.66%
|
