v3.26.1
Shareholder Report
6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Calvert Management Series
Entity Central Index Key 0000319676
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000146359  
Shareholder Report [Line Items]  
Fund Name Calvert Flexible Bond Fund
Class Name Class A
Trading Symbol CUBAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Flexible Bond Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$44
0.88%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.88% [1]
AssetsNet $ 869,315,689
Holdings Count | Holding 434
InvestmentCompanyPortfolioTurnover 119.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$869,315,689
# of Portfolio Holdings
434
Portfolio Turnover Rate
119%
Holdings [Text Block]

Asset Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
3.2%
Senior Floating-Rate Loans
3.9%
Collateralized Mortgage Obligations
4.8%
Commercial Mortgage-Backed Securities
6.7%
Asset-Backed Securities
11.2%
Short-Term Investments
13.2%
U.S. Treasury Obligations
15.8%
U.S. Government Agency Mortgage-Backed Securities
16.2%
Corporate Bonds
25.0%
Footnote Description
Footnote*
Investment types less than 1% each

Credit Quality (% of net assets)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash & Equivalents
10.2%
Not Rated
6.8%
C
0.1%
CCC
0.7%
B
5.8%
BB
10.7%
BBB
21.6%
A
5.1%
AA
32.8%
AAA
6.2%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000146360  
Shareholder Report [Line Items]  
Fund Name Calvert Flexible Bond Fund
Class Name Class C
Trading Symbol CUBCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Flexible Bond Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$81
1.63%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.63% [2]
AssetsNet $ 869,315,689
Holdings Count | Holding 434
InvestmentCompanyPortfolioTurnover 119.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$869,315,689
# of Portfolio Holdings
434
Portfolio Turnover Rate
119%
Holdings [Text Block]

Asset Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
3.2%
Senior Floating-Rate Loans
3.9%
Collateralized Mortgage Obligations
4.8%
Commercial Mortgage-Backed Securities
6.7%
Asset-Backed Securities
11.2%
Short-Term Investments
13.2%
U.S. Treasury Obligations
15.8%
U.S. Government Agency Mortgage-Backed Securities
16.2%
Corporate Bonds
25.0%
Footnote Description
Footnote*
Investment types less than 1% each

Credit Quality (% of net assets)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash & Equivalents
10.2%
Not Rated
6.8%
C
0.1%
CCC
0.7%
B
5.8%
BB
10.7%
BBB
21.6%
A
5.1%
AA
32.8%
AAA
6.2%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000146362  
Shareholder Report [Line Items]  
Fund Name Calvert Flexible Bond Fund
Class Name Class I
Trading Symbol CUBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Flexible Bond Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$32
0.64%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.64% [3]
AssetsNet $ 869,315,689
Holdings Count | Holding 434
InvestmentCompanyPortfolioTurnover 119.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$869,315,689
# of Portfolio Holdings
434
Portfolio Turnover Rate
119%
Holdings [Text Block]

Asset Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
3.2%
Senior Floating-Rate Loans
3.9%
Collateralized Mortgage Obligations
4.8%
Commercial Mortgage-Backed Securities
6.7%
Asset-Backed Securities
11.2%
Short-Term Investments
13.2%
U.S. Treasury Obligations
15.8%
U.S. Government Agency Mortgage-Backed Securities
16.2%
Corporate Bonds
25.0%
Footnote Description
Footnote*
Investment types less than 1% each

Credit Quality (% of net assets)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash & Equivalents
10.2%
Not Rated
6.8%
C
0.1%
CCC
0.7%
B
5.8%
BB
10.7%
BBB
21.6%
A
5.1%
AA
32.8%
AAA
6.2%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000213138  
Shareholder Report [Line Items]  
Fund Name Calvert Flexible Bond Fund
Class Name Class R6
Trading Symbol CUBRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Flexible Bond Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R6
$27
0.54%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.54% [4]
AssetsNet $ 869,315,689
Holdings Count | Holding 434
InvestmentCompanyPortfolioTurnover 119.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$869,315,689
# of Portfolio Holdings
434
Portfolio Turnover Rate
119%
Holdings [Text Block]

Asset Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
3.2%
Senior Floating-Rate Loans
3.9%
Collateralized Mortgage Obligations
4.8%
Commercial Mortgage-Backed Securities
6.7%
Asset-Backed Securities
11.2%
Short-Term Investments
13.2%
U.S. Treasury Obligations
15.8%
U.S. Government Agency Mortgage-Backed Securities
16.2%
Corporate Bonds
25.0%
Footnote Description
Footnote*
Investment types less than 1% each

Credit Quality (% of net assets)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash & Equivalents
10.2%
Not Rated
6.8%
C
0.1%
CCC
0.7%
B
5.8%
BB
10.7%
BBB
21.6%
A
5.1%
AA
32.8%
AAA
6.2%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000014074  
Shareholder Report [Line Items]  
Fund Name Calvert Responsible Municipal Income Fund
Class Name Class A
Trading Symbol CTTLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Responsible Municipal Income Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$38
0.75%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.75% [5]
AssetsNet $ 433,151,343
Holdings Count | Holding 308
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$433,151,343
# of Portfolio Holdings
308
Portfolio Turnover Rate
15%
Holdings [Text Block]

Sector Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
12.4%
Special Tax Revenue
4.1%
Education
5.0%
Transportation
5.4%
Lease Rev./Cert. of Participation
6.1%
Electric Utilities
6.4%
Other Revenue
7.1%
Hospital
7.7%
Water and Sewer
8.5%
General Obligations
18.1%
Housing
19.2%
Footnote Description
Footnote*
Sectors less than 3% each.

Credit Quality (% of total investments)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash Securities
2.6%
Not Rated
1.3%
B
0.4%
BB
3.4%
BBB
6.9%
A
22.1%
AA
50.3%
AAA
13.0%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000160651  
Shareholder Report [Line Items]  
Fund Name Calvert Responsible Municipal Income Fund
Class Name Class C
Trading Symbol CTTCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Responsible Municipal Income Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$75
1.50%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.50% [6]
AssetsNet $ 433,151,343
Holdings Count | Holding 308
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$433,151,343
# of Portfolio Holdings
308
Portfolio Turnover Rate
15%
Holdings [Text Block]

Sector Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
12.4%
Special Tax Revenue
4.1%
Education
5.0%
Transportation
5.4%
Lease Rev./Cert. of Participation
6.1%
Electric Utilities
6.4%
Other Revenue
7.1%
Hospital
7.7%
Water and Sewer
8.5%
General Obligations
18.1%
Housing
19.2%
Footnote Description
Footnote*
Sectors less than 3% each.

Credit Quality (% of total investments)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash Securities
2.6%
Not Rated
1.3%
B
0.4%
BB
3.4%
BBB
6.9%
A
22.1%
AA
50.3%
AAA
13.0%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000160653  
Shareholder Report [Line Items]  
Fund Name Calvert Responsible Municipal Income Fund
Class Name Class I
Trading Symbol CTTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Responsible Municipal Income Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$25
0.50%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50% [7]
AssetsNet $ 433,151,343
Holdings Count | Holding 308
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$433,151,343
# of Portfolio Holdings
308
Portfolio Turnover Rate
15%
Holdings [Text Block]

Sector Allocation (% of total investments)

Credit Rating Chart
Table Summary
Value
Value
OtherFootnote Reference*
12.4%
Special Tax Revenue
4.1%
Education
5.0%
Transportation
5.4%
Lease Rev./Cert. of Participation
6.1%
Electric Utilities
6.4%
Other Revenue
7.1%
Hospital
7.7%
Water and Sewer
8.5%
General Obligations
18.1%
Housing
19.2%
Footnote Description
Footnote*
Sectors less than 3% each.

Credit Quality (% of total investments)Footnote Referencea

Group By Asset Type Chart
Table Summary
Value
Value
Cash Securities
2.6%
Not Rated
1.3%
B
0.4%
BB
3.4%
BBB
6.9%
A
22.1%
AA
50.3%
AAA
13.0%
Footnote Description
Footnotea
Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000241884  
Shareholder Report [Line Items]  
Fund Name Calvert Small/Mid-Cap Fund
Class Name Class A
Trading Symbol CMPAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Small/Mid-Cap Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$59
1.14%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.14% [8]
AssetsNet $ 208,593,171
Holdings Count | Holding 81
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$208,593,171
# of Portfolio Holdings
81
Portfolio Turnover Rate
19%
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Energy
1.4%
Short-Term Investments
1.8%
Utilities
1.9%
Consumer Staples
4.5%
Materials
5.2%
Health Care
5.4%
Real Estate
6.6%
Information Technology
14.6%
Consumer Discretionary
16.2%
Financials
18.8%
Industrials
23.6%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
CSW Industrials, Inc.
3.0%
Dorman Products, Inc.
2.7%
Franklin Electric Co., Inc.
2.4%
Performance Food Group Co.
2.3%
Valvoline, Inc.
2.2%
Donaldson Co., Inc.
2.2%
Royalty Pharma PLC, Class A
2.2%
Wyndham Hotels & Resorts, Inc.
2.1%
Southstate Bank Corp.
1.9%
Cincinnati Financial Corp.
1.9%
Total
22.9%
Footnote Description
Footnotea
Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000241883  
Shareholder Report [Line Items]  
Fund Name Calvert Small/Mid-Cap Fund
Class Name Class C
Trading Symbol CMPCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Small/Mid-Cap Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$98
1.89%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 98
Expense Ratio, Percent 1.89% [9]
AssetsNet $ 208,593,171
Holdings Count | Holding 81
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$208,593,171
# of Portfolio Holdings
81
Portfolio Turnover Rate
19%
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Energy
1.4%
Short-Term Investments
1.8%
Utilities
1.9%
Consumer Staples
4.5%
Materials
5.2%
Health Care
5.4%
Real Estate
6.6%
Information Technology
14.6%
Consumer Discretionary
16.2%
Financials
18.8%
Industrials
23.6%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
CSW Industrials, Inc.
3.0%
Dorman Products, Inc.
2.7%
Franklin Electric Co., Inc.
2.4%
Performance Food Group Co.
2.3%
Valvoline, Inc.
2.2%
Donaldson Co., Inc.
2.2%
Royalty Pharma PLC, Class A
2.2%
Wyndham Hotels & Resorts, Inc.
2.1%
Southstate Bank Corp.
1.9%
Cincinnati Financial Corp.
1.9%
Total
22.9%
Footnote Description
Footnotea
Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000241882  
Shareholder Report [Line Items]  
Fund Name Calvert Small/Mid-Cap Fund
Class Name Class I
Trading Symbol CMCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Small/Mid-Cap Fund for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.
Additional Information Phone Number 1-800-368-2745
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$46
0.89%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.89% [10]
AssetsNet $ 208,593,171
Holdings Count | Holding 81
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$208,593,171
# of Portfolio Holdings
81
Portfolio Turnover Rate
19%
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Energy
1.4%
Short-Term Investments
1.8%
Utilities
1.9%
Consumer Staples
4.5%
Materials
5.2%
Health Care
5.4%
Real Estate
6.6%
Information Technology
14.6%
Consumer Discretionary
16.2%
Financials
18.8%
Industrials
23.6%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
CSW Industrials, Inc.
3.0%
Dorman Products, Inc.
2.7%
Franklin Electric Co., Inc.
2.4%
Performance Food Group Co.
2.3%
Valvoline, Inc.
2.2%
Donaldson Co., Inc.
2.2%
Royalty Pharma PLC, Class A
2.2%
Wyndham Hotels & Resorts, Inc.
2.1%
Southstate Bank Corp.
1.9%
Cincinnati Financial Corp.
1.9%
Total
22.9%
Footnote Description
Footnotea
Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
[1] Annualized
[2] Annualized
[3] Annualized
[4] Annualized
[5] Annualized
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[9] Annualized
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