Fees and Expenses - Eaton Vance AMT-Free Municipal Income Fund
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Sep. 30, 2025
USD ($)
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| Prospectus [Line Items] |
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| Expense Narrative [Text Block] |
This table describes the fees and expenses that you may
pay if you buy, hold and sell shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary,
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 $100,000 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 the Fund’s
Prospectus. More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning
on page 55 of the Fund’s Prospectus and page 22 of the Fund’s Statement of Additional Information.
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| Expense Breakpoint Discounts [Text] |
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 $100,000 in Eaton Vance funds.
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| Expense Breakpoint, Minimum Investment Required [Amount] |
$ 100,000
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| Shareholder Fees Caption [Optional Text] |
Shareholder Fees (fees paid directly from your investment)
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| Shareholder Fees [Table] |
| | Class A | Class C | Class I | | Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) | 3.25% | None | None | | Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption) | None1 | 1.00% | None |
| 1 | Class A shares purchased at net asset value in amounts of $500,000 or more are subject to a 0.75% contingent deferred sales charge
if redeemed within 12 months of purchase. |
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| Operating Expenses Caption [Optional Text] |
Annual Fund Operating Expenses (expenses you pay
each year as a percentage of the value of your investment)
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| Annual Fund Operating Expenses [Table] |
| | Class A | Class C | Class I | | Management Fees | 0.44% | 0.44% | 0.44% | | Distribution and Service (12b-1) Fees | 0.25% | 1.00% | None | | Other Expenses | 0.22% | 0.22% | 0.22% | | Interest Expense | 0.06% | 0.06% | 0.06% | | Expenses other than Interest Expense | 0.16% | 0.16% | 0.16% | | Total Annual Fund Operating Expenses | 0.91% | 1.66% | 0.66% | | Expense Reimbursement1 | -0.08% | -0.08% | -0.08% | | Total Annual Fund Operating Expenses After Expense Reimbursement | 0.83% | 1.58% | 0.58% |
| 1 | The investment adviser and administrator have agreed to reimburse the Fund’s expenses to the extent that Total Annual Fund Operating
Expenses exceed 0.77% for Class A shares, 1.52% for Class C shares and 0.52% for Class I shares. This expense reimbursement will continue
through February 1, 2028. 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 during the same fiscal year to the extent actual expenses
are less than any contractual expense cap in place during such year. Pursuant to this arrangement, the investment adviser may recoup from
the Fund any reimbursed expenses during the same fiscal year if such recoupment does not cause the Fund’s Total Annual Fund Operating
Expenses after such recoupment to exceed (i) the expense limit in effect at the time of the reimbursement; or (ii) the expense limit in
effect at the time of recoupment. |
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| Expenses Deferred Charges [Text Block] |
Class A shares purchased at net asset value in amounts of $500,000 or more are subject to a 0.75% contingent deferred sales charge
if redeemed within 12 months of purchase.
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| Expense Example [Heading] |
Example.
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| Expense Example Narrative [Text Block] |
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:
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| Expense Example by, Year, Caption [Text] |
If you SOLD Your Shares
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| Expense Example, With Redemption [Table] |
| | 1 Year | 3 Years | 5 Years | 10 Years | | Class A shares | $407 | $598 | $805 | $1,401 | | Class C shares | $261 | $516 | $895 | $1,759 | | Class I shares | $59 | $203 | $360 | $815 |
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| Expense Example, No Redemption, By Year, Caption [Text] |
If you HELD Your Shares
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| Expense Example, No Redemption [Table] |
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1 Year |
3 Years |
5 Years |
10 Years |
| Class A shares |
$407 |
$598 |
$805 |
$1,401 |
| Class C shares |
$161 |
$516 |
$895 |
$1,759 |
| Class I shares |
$59 |
$203 |
$360 |
$815 |
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