This semi-annual shareholder report contains important information about the Calvert Global Energy Solutions Fund for the period of October 1, 2025 to March 31, 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	$65	1.24%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.24%

^[1]

AssetsNet

$ 171,693,480

Holdings Count | Holding

173

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$171,693,480
# of Portfolio Holdings	173
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	27.3%
Denmark	3.3%
United Kingdom	3.9%
Japan	4.3%
France	4.3%
Taiwan	4.8%
Spain	4.8%
Canada	5.3%
China	5.7%
Germany	6.0%
United States	30.3%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Neste OYJ	1.3%
SSE PLC	1.1%
Orsted AS	1.0%
Boralex, Inc., Class A	1.0%
EDP SA	1.0%
Ormat Technologies, Inc.	1.0%
Verbund AG	1.0%
Brookfield Renewable Partners LP	1.0%
Northland Power, Inc.	1.0%
Elia Group SA	0.9%
Total	10.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000047595

Shareholder Report [Line Items]

Fund Name

Calvert Global Energy Solutions Fund

Class Name

Class C

Trading Symbol

CGACX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Global Energy Solutions Fund for the period of October 1, 2025 to March 31, 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

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	$105	1.99%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 105

Expense Ratio, Percent

1.99%

^[2]

AssetsNet

$ 171,693,480

Holdings Count | Holding

173

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$171,693,480
# of Portfolio Holdings	173
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	27.3%
Denmark	3.3%
United Kingdom	3.9%
Japan	4.3%
France	4.3%
Taiwan	4.8%
Spain	4.8%
Canada	5.3%
China	5.7%
Germany	6.0%
United States	30.3%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Neste OYJ	1.3%
SSE PLC	1.1%
Orsted AS	1.0%
Boralex, Inc., Class A	1.0%
EDP SA	1.0%
Ormat Technologies, Inc.	1.0%
Verbund AG	1.0%
Brookfield Renewable Partners LP	1.0%
Northland Power, Inc.	1.0%
Elia Group SA	0.9%
Total	10.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000047596

Shareholder Report [Line Items]

Fund Name

Calvert Global Energy Solutions Fund

Class Name

Class I

Trading Symbol

CAEIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Global Energy Solutions Fund for the period of October 1, 2025 to March 31, 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

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	$52	0.99%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.99%

^[3]

AssetsNet

$ 171,693,480

Holdings Count | Holding

173

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$171,693,480
# of Portfolio Holdings	173
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	27.3%
Denmark	3.3%
United Kingdom	3.9%
Japan	4.3%
France	4.3%
Taiwan	4.8%
Spain	4.8%
Canada	5.3%
China	5.7%
Germany	6.0%
United States	30.3%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Neste OYJ	1.3%
SSE PLC	1.1%
Orsted AS	1.0%
Boralex, Inc., Class A	1.0%
EDP SA	1.0%
Ormat Technologies, Inc.	1.0%
Verbund AG	1.0%
Brookfield Renewable Partners LP	1.0%
Northland Power, Inc.	1.0%
Elia Group SA	0.9%
Total	10.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000070983

Shareholder Report [Line Items]

Fund Name

Calvert Global Water Fund

Class Name

Class A

Trading Symbol

CFWAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Global Water Fund for the period of October 1, 2025 to March 31, 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

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	$62	1.24%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 62

Expense Ratio, Percent

1.24%

^[4]

AssetsNet

$ 540,363,647

Holdings Count | Holding

119

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$540,363,647
# of Portfolio Holdings	119
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	10.5%
Canada	1.4%
Australia	1.8%
Italy	1.8%
France	3.1%
Switzerland	4.2%
Brazil	4.6%
China	4.8%
Japan	6.5%
United Kingdom	8.2%
United States	53.1%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
American Water Works Co., Inc.	1.8%
Cia de Saneamento Basico do Estado de Sao Paulo (SABESP), ADR	1.8%
Essential Utilities, Inc.	1.7%
Veolia Environnement SA	1.7%
United Utilities Group PLC	1.6%
Ecolab, Inc.	1.6%
Severn Trent PLC	1.6%
Waters Corp.	1.6%
Xylem, Inc.	1.5%
Veralto Corp.	1.4%
Total	16.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000070984

Shareholder Report [Line Items]

Fund Name

Calvert Global Water Fund

Class Name

Class C

Trading Symbol

CFWCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Global Water Fund for the period of October 1, 2025 to March 31, 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

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	$99	1.99%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

1.99%

^[5]

AssetsNet

$ 540,363,647

Holdings Count | Holding

119

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$540,363,647
# of Portfolio Holdings	119
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	10.5%
Canada	1.4%
Australia	1.8%
Italy	1.8%
France	3.1%
Switzerland	4.2%
Brazil	4.6%
China	4.8%
Japan	6.5%
United Kingdom	8.2%
United States	53.1%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
American Water Works Co., Inc.	1.8%
Cia de Saneamento Basico do Estado de Sao Paulo (SABESP), ADR	1.8%
Essential Utilities, Inc.	1.7%
Veolia Environnement SA	1.7%
United Utilities Group PLC	1.6%
Ecolab, Inc.	1.6%
Severn Trent PLC	1.6%
Waters Corp.	1.6%
Xylem, Inc.	1.5%
Veralto Corp.	1.4%
Total	16.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000139783

Shareholder Report [Line Items]

Fund Name

Calvert Global Water Fund

Class Name

Class I

Trading Symbol

CFWIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Global Water Fund for the period of October 1, 2025 to March 31, 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

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	$49	0.99%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.99%

^[6]

AssetsNet

$ 540,363,647

Holdings Count | Holding

119

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$540,363,647
# of Portfolio Holdings	119
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Allocation (% of total investments)

Table Summary
Value	Value
Other	10.5%
Canada	1.4%
Australia	1.8%
Italy	1.8%
France	3.1%
Switzerland	4.2%
Brazil	4.6%
China	4.8%
Japan	6.5%
United Kingdom	8.2%
United States	53.1%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
American Water Works Co., Inc.	1.8%
Cia de Saneamento Basico do Estado de Sao Paulo (SABESP), ADR	1.8%
Essential Utilities, Inc.	1.7%
Veolia Environnement SA	1.7%
United Utilities Group PLC	1.6%
Ecolab, Inc.	1.6%
Severn Trent PLC	1.6%
Waters Corp.	1.6%
Xylem, Inc.	1.5%
Veralto Corp.	1.4%
Total	16.3%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000131729

Shareholder Report [Line Items]

Fund Name

Calvert Green Bond Fund

Class Name

Class A

Trading Symbol

CGAFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Green Bond Fund for the period of October 1, 2025 to March 31, 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

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	$37	0.74%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.74%

^[7]

AssetsNet

$ 822,909,823

Holdings Count | Holding

192

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$822,909,823
# of Portfolio Holdings	192
Portfolio Turnover Rate	13%

Holdings [Text Block]

Asset Allocation (% of total investments)

Table Summary
Value	Value
Other^{Footnote Reference†}	0.8%
Preferred Stocks	1.0%
Taxable Municipal Obligations	1.3%
Short-Term Investments	4.3%
Sovereign Government Bonds	9.1%
Asset-Backed Securities	10.5%
Commercial Mortgage-Backed Securities	11.3%
U.S. Government Agency Mortgage-Backed Securities	17.4%
Corporate Bonds	44.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Table Summary
Value	Value
Cash & Equivalents	8.5%
Not Rated	0.1%
B	1.0%
BB	2.1%
BBB	20.2%
A	22.0%
AA	6.5%
AAA	39.6%

Footnote

Description

Footnote^a

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

C000131731

Shareholder Report [Line Items]

Fund Name

Calvert Green Bond Fund

Class Name

Class I

Trading Symbol

CGBIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Green Bond Fund for the period of October 1, 2025 to March 31, 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

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	0.49%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

^[8]

AssetsNet

$ 822,909,823

Holdings Count | Holding

192

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$822,909,823
# of Portfolio Holdings	192
Portfolio Turnover Rate	13%

Holdings [Text Block]

Asset Allocation (% of total investments)

Table Summary
Value	Value
Other^{Footnote Reference†}	0.8%
Preferred Stocks	1.0%
Taxable Municipal Obligations	1.3%
Short-Term Investments	4.3%
Sovereign Government Bonds	9.1%
Asset-Backed Securities	10.5%
Commercial Mortgage-Backed Securities	11.3%
U.S. Government Agency Mortgage-Backed Securities	17.4%
Corporate Bonds	44.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Table Summary
Value	Value
Cash & Equivalents	8.5%
Not Rated	0.1%
B	1.0%
BB	2.1%
BBB	20.2%
A	22.0%
AA	6.5%
AAA	39.6%

Footnote

Description

Footnote^a

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000211124

Shareholder Report [Line Items]

Fund Name

Calvert Green Bond Fund

Class Name

Class R6

Trading Symbol

CBGRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Green Bond Fund for the period of October 1, 2025 to March 31, 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

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	$22	0.44%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.44%

^[9]

AssetsNet

$ 822,909,823

Holdings Count | Holding

192

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$822,909,823
# of Portfolio Holdings	192
Portfolio Turnover Rate	13%

Holdings [Text Block]

Asset Allocation (% of total investments)

Table Summary
Value	Value
Other^{Footnote Reference†}	0.8%
Preferred Stocks	1.0%
Taxable Municipal Obligations	1.3%
Short-Term Investments	4.3%
Sovereign Government Bonds	9.1%
Asset-Backed Securities	10.5%
Commercial Mortgage-Backed Securities	11.3%
U.S. Government Agency Mortgage-Backed Securities	17.4%
Corporate Bonds	44.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Table Summary
Value	Value
Cash & Equivalents	8.5%
Not Rated	0.1%
B	1.0%
BB	2.1%
BBB	20.2%
A	22.0%
AA	6.5%
AAA	39.6%

Footnote

Description

Footnote^a

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000023745

Shareholder Report [Line Items]

Fund Name

Calvert Small-Cap Fund

Class Name

Class A

Trading Symbol

CCVAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Small-Cap Fund for the period of October 1, 2025 to March 31, 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

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	1.22%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 59

Expense Ratio, Percent

1.22%

^[10]

AssetsNet

$ 1,500,929,921

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$1,500,929,921
# of Portfolio Holdings	67
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Table Summary
Value	Value
Short-Term Investments	1.0%
Energy	1.1%
Utilities	2.8%
Consumer Staples	3.2%
Health Care	6.9%
Materials	7.1%
Real Estate	7.1%
Information Technology	12.1%
Consumer Discretionary	15.6%
Financials	20.2%
Industrials	22.9%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Community Financial System, Inc.	3.3%
CSW Industrials, Inc.	3.2%
Franklin Electric Co., Inc.	3.1%
Valvoline, Inc.	2.9%
Dorman Products, Inc.	2.9%
Diodes, Inc.	2.8%
IDACORP, Inc.	2.8%
Donaldson Co., Inc.	2.8%
Essential Properties Realty Trust, Inc.	2.7%
Aramark	2.7%
Total	29.2%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000023746

Shareholder Report [Line Items]

Fund Name

Calvert Small-Cap Fund

Class Name

Class C

Trading Symbol

CSCCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Small-Cap Fund for the period of October 1, 2025 to March 31, 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

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	$95	1.97%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 95

Expense Ratio, Percent

1.97%

^[11]

AssetsNet

$ 1,500,929,921

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$1,500,929,921
# of Portfolio Holdings	67
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Table Summary
Value	Value
Short-Term Investments	1.0%
Energy	1.1%
Utilities	2.8%
Consumer Staples	3.2%
Health Care	6.9%
Materials	7.1%
Real Estate	7.1%
Information Technology	12.1%
Consumer Discretionary	15.6%
Financials	20.2%
Industrials	22.9%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Community Financial System, Inc.	3.3%
CSW Industrials, Inc.	3.2%
Franklin Electric Co., Inc.	3.1%
Valvoline, Inc.	2.9%
Dorman Products, Inc.	2.9%
Diodes, Inc.	2.8%
IDACORP, Inc.	2.8%
Donaldson Co., Inc.	2.8%
Essential Properties Realty Trust, Inc.	2.7%
Aramark	2.7%
Total	29.2%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000023747

Shareholder Report [Line Items]

Fund Name

Calvert Small-Cap Fund

Class Name

Class I

Trading Symbol

CSVIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Small-Cap Fund for the period of October 1, 2025 to March 31, 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

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	$48	0.98%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.98%

^[12]

AssetsNet

$ 1,500,929,921

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$1,500,929,921
# of Portfolio Holdings	67
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Table Summary
Value	Value
Short-Term Investments	1.0%
Energy	1.1%
Utilities	2.8%
Consumer Staples	3.2%
Health Care	6.9%
Materials	7.1%
Real Estate	7.1%
Information Technology	12.1%
Consumer Discretionary	15.6%
Financials	20.2%
Industrials	22.9%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Community Financial System, Inc.	3.3%
CSW Industrials, Inc.	3.2%
Franklin Electric Co., Inc.	3.1%
Valvoline, Inc.	2.9%
Dorman Products, Inc.	2.9%
Diodes, Inc.	2.8%
IDACORP, Inc.	2.8%
Donaldson Co., Inc.	2.8%
Essential Properties Realty Trust, Inc.	2.7%
Aramark	2.7%
Total	29.2%

Footnote	Description
Footnote^a	Excluding cash equivalents

Material Fund Change [Text Block]

Updated Prospectus Phone Number

1-800-368-2745

C000211123

Shareholder Report [Line Items]

Fund Name

Calvert Small-Cap Fund

Class Name

Class R6

Trading Symbol

CALRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Calvert Small-Cap Fund for the period of October 1, 2025 to March 31, 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

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	$44	0.91%^{Footnote Reference1}

Footnote	Description
Footnote¹	Annualized

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.91%

^[13]

AssetsNet

$ 1,500,929,921

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets	$1,500,929,921
# of Portfolio Holdings	67
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Table Summary
Value	Value
Short-Term Investments	1.0%
Energy	1.1%
Utilities	2.8%
Consumer Staples	3.2%
Health Care	6.9%
Materials	7.1%
Real Estate	7.1%
Information Technology	12.1%
Consumer Discretionary	15.6%
Financials	20.2%
Industrials	22.9%

Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Table Summary
Community Financial System, Inc.	3.3%
CSW Industrials, Inc.	3.2%
Franklin Electric Co., Inc.	3.1%
Valvoline, Inc.	2.9%
Dorman Products, Inc.	2.9%
Diodes, Inc.	2.8%
IDACORP, Inc.	2.8%
Donaldson Co., Inc.	2.8%
Essential Properties Realty Trust, Inc.	2.7%
Aramark	2.7%
Total	29.2%

Footnote	Description
Footnote^a	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
[6]	Annualized
[7]	Annualized
[8]	Annualized
[9]	Annualized
[10]	Annualized
[11]	Annualized
[12]	Annualized
[13]	Annualized

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Country Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Asset Allocation (% of total investments)

Credit Quality (% of net assets)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Asset Allocation (% of total investments)

Credit Quality (% of net assets)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Asset Allocation (% of total investments)

Credit Quality (% of net assets)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Sector Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Sector Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Sector Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

What were the Fund costs for the last six months?

Key Fund Statistics

Sector Allocation (% of total investments)

Top Ten Holdings (% of total investments)Footnote Referencea

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Credit Quality (% of net assets)^{Footnote Referencea}

Credit Quality (% of net assets)^{Footnote Referencea}

Credit Quality (% of net assets)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}

Top Ten Holdings (% of total investments)^{Footnote Referencea}