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 47 of the Fund’s Prospectus and page 23 of the Fund’s Statement of Additional Information.

Expenses Restated to Reflect Current [Text]

Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the “Portfolio”), the Portfolio in which the Fund invests its assets.

Other Expenses, New Fund, Based on Estimates [Text]

Other expenses include borrowing cost of 0.05% based on the outstanding borrowing and related costs as of the Fund’s most recent fiscal year end. The actual amount of borrowing costs borne by the Portfolio will vary over time based on the Portfolio’s use of borrowings and variations in market interest rates.

Shareholder Fees [Table]

Advisers

Class

Class A

Class C

Class I

Class R6

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

None

3.25%

None

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption)

None

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.

Annual Fund Operating Expenses [Table]

	Advisers Class	Class A	Class C	Class I	Class R6
Management Fees	0.66%	0.66%	0.66%	0.66%	0.66%
Distribution and Service (12b-1) Fees	0.25%	0.25%	1.00%	None	None
Other Expenses¹	0.16%	0.16%	0.16%	0.16%	0.10%
Total Annual Fund Operating Expenses²	1.07%	1.07%	1.82%	0.82%	0.76%
Expense Reimbursement³	-0.01%	-0.01%	-0.01%	-0.01%	-0.01%
Total Annual Fund Operating Expenses After Expense Reimbursement	1.06%	1.06%	1.81%	0.81%	0.75%

¹	Other expenses include borrowing cost of 0.05% based on the outstanding borrowing and related costs as of the Fund’s most recent fiscal year end. The actual amount of borrowing costs borne by the Portfolio will vary over time based on the Portfolio’s use of borrowings and variations in market interest rates.

²	Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the “Portfolio”), the Portfolio in which the Fund invests its assets.

³	The investment adviser and administrator have agreed to reimburse the Fund’s expenses to the extent that Total Annual Fund Operating Expenses exceed 1.01% for Advisers and Class A shares, 1.76% for Class C shares, 0.76% for Class I shares and 0.70% for Class R6 shares. This expense reimbursement will continue through March 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.

Expense Example [Heading]

Example.

Expense Example by, Year, Caption [Text]

If you SOLD Your Shares

Expense Example, No Redemption, By Year, Caption [Text]

If you HELD Your Shares

Expense Heading [Optional Text]

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 47 of the Fund’s Prospectus and page 23 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 100,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)

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.

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:

Expense Example, With Redemption [Table]

	1 Year	3 Years	5 Years	10 Years
Advisers Class shares	$110	$346	$600	$1,328
Class A shares	$432	$659	$905	$1,610
Class C shares	$286	$578	$995	$1,959
Class I shares	$85	$267	$465	$1,036
Class R6 shares	$79	$248	$432	$965

Expense Example, No Redemption [Table]

	1 Year	3 Years	5 Years	10 Years
Advisers Class shares	$110	$346	$600	$1,328
Class A shares	$432	$659	$905	$1,610
Class C shares	$186	$578	$995	$1,959
Class I shares	$85	$267	$465	$1,036
Class R6 shares	$79	$248	$432	$965