v3.26.1
Shareholder Report
 6 Months Ended
Mar. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name CALVERT WORLD VALUES FUND INC
Entity Central Index Key 0000884110
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000214854  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Advancement Fund
Class Name Class A
Trading Symbol CEFAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Advancement 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
$62
1.20%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.20% [1]
AssetsNet $ 135,022,036
Holdings Count | Holding 318
InvestmentCompanyPortfolioTurnover 26.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$135,022,036
# of Portfolio Holdings
318
Portfolio Turnover Rate
26%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
16.1%
Cyprus
3.5%
South Africa
5.2%
United States
5.4%
Brazil
6.5%
Chile
8.6%
India
9.1%
China
9.3%
South Korea
11.6%
Greece
11.8%
Taiwan
12.9%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
6.0%
Samsung Electronics Co. Ltd.
5.4%
Bank of Cyprus Holdings PLC
3.5%
SK Hynix, Inc.
3.0%
National Bank of Greece SA
2.9%
Nova Ljubljanska Banka DD, GDR
2.9%
Georgia Capital PLC
2.3%
Eurobank SA, Class A
2.2%
Sociedad Quimica y Minera de Chile SA, Class B, PFC Shares
2.2%
Tencent Holdings Ltd.
2.1%
Total
32.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000214852  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Advancement Fund
Class Name Class I
Trading Symbol CEFIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Advancement 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 I
$49
0.95%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.95% [2]
AssetsNet $ 135,022,036
Holdings Count | Holding 318
InvestmentCompanyPortfolioTurnover 26.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$135,022,036
# of Portfolio Holdings
318
Portfolio Turnover Rate
26%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
16.1%
Cyprus
3.5%
South Africa
5.2%
United States
5.4%
Brazil
6.5%
Chile
8.6%
India
9.1%
China
9.3%
South Korea
11.6%
Greece
11.8%
Taiwan
12.9%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
6.0%
Samsung Electronics Co. Ltd.
5.4%
Bank of Cyprus Holdings PLC
3.5%
SK Hynix, Inc.
3.0%
National Bank of Greece SA
2.9%
Nova Ljubljanska Banka DD, GDR
2.9%
Georgia Capital PLC
2.3%
Eurobank SA, Class A
2.2%
Sociedad Quimica y Minera de Chile SA, Class B, PFC Shares
2.2%
Tencent Holdings Ltd.
2.1%
Total
32.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000118372  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Equity Fund
Class Name Class A
Trading Symbol CVMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Equity 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% [3]
AssetsNet $ 1,397,981,288
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,397,981,288
# of Portfolio Holdings
73
Portfolio Turnover Rate
8%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.6%
United States
1.8%
Hong Kong
2.7%
Poland
2.9%
Mexico
3.0%
South Africa
4.2%
Brazil
6.3%
India
13.3%
South Korea
15.4%
China
16.7%
Taiwan
27.1%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
16.9%
Samsung Electronics Co. Ltd.
7.9%
Tencent Holdings Ltd.
5.3%
Alibaba Group Holding Ltd.
4.0%
Delta Electronics, Inc.
4.0%
SK Hynix, Inc.
2.9%
ICICI Bank Ltd.
2.2%
KB Financial Group, Inc.
1.9%
HDFC Bank Ltd.
1.9%
Antofagasta PLC
1.7%
Total
48.7%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000118373  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Equity Fund
Class Name Class C
Trading Symbol CVMCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Equity 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 C
$104
1.99%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 104
Expense Ratio, Percent 1.99% [4]
AssetsNet $ 1,397,981,288
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,397,981,288
# of Portfolio Holdings
73
Portfolio Turnover Rate
8%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.6%
United States
1.8%
Hong Kong
2.7%
Poland
2.9%
Mexico
3.0%
South Africa
4.2%
Brazil
6.3%
India
13.3%
South Korea
15.4%
China
16.7%
Taiwan
27.1%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
16.9%
Samsung Electronics Co. Ltd.
7.9%
Tencent Holdings Ltd.
5.3%
Alibaba Group Holding Ltd.
4.0%
Delta Electronics, Inc.
4.0%
SK Hynix, Inc.
2.9%
ICICI Bank Ltd.
2.2%
KB Financial Group, Inc.
1.9%
HDFC Bank Ltd.
1.9%
Antofagasta PLC
1.7%
Total
48.7%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000118374  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Equity Fund
Class Name Class I
Trading Symbol CVMIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Equity 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 I
$52
0.99%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 52
Expense Ratio, Percent 0.99% [5]
AssetsNet $ 1,397,981,288
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,397,981,288
# of Portfolio Holdings
73
Portfolio Turnover Rate
8%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.6%
United States
1.8%
Hong Kong
2.7%
Poland
2.9%
Mexico
3.0%
South Africa
4.2%
Brazil
6.3%
India
13.3%
South Korea
15.4%
China
16.7%
Taiwan
27.1%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
16.9%
Samsung Electronics Co. Ltd.
7.9%
Tencent Holdings Ltd.
5.3%
Alibaba Group Holding Ltd.
4.0%
Delta Electronics, Inc.
4.0%
SK Hynix, Inc.
2.9%
ICICI Bank Ltd.
2.2%
KB Financial Group, Inc.
1.9%
HDFC Bank Ltd.
1.9%
Antofagasta PLC
1.7%
Total
48.7%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000199810  
Shareholder Report [Line Items]  
Fund Name Calvert Emerging Markets Equity Fund
Class Name Class R6
Trading Symbol CVMRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert Emerging Markets Equity 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 R6
$48
0.92%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.92% [6]
AssetsNet $ 1,397,981,288
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,397,981,288
# of Portfolio Holdings
73
Portfolio Turnover Rate
8%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.6%
United States
1.8%
Hong Kong
2.7%
Poland
2.9%
Mexico
3.0%
South Africa
4.2%
Brazil
6.3%
India
13.3%
South Korea
15.4%
China
16.7%
Taiwan
27.1%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Taiwan Semiconductor Manufacturing Co. Ltd.
16.9%
Samsung Electronics Co. Ltd.
7.9%
Tencent Holdings Ltd.
5.3%
Alibaba Group Holding Ltd.
4.0%
Delta Electronics, Inc.
4.0%
SK Hynix, Inc.
2.9%
ICICI Bank Ltd.
2.2%
KB Financial Group, Inc.
1.9%
HDFC Bank Ltd.
1.9%
Antofagasta PLC
1.7%
Total
48.7%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000023776  
Shareholder Report [Line Items]  
Fund Name Calvert International Equity Fund
Class Name Class A
Trading Symbol CWVGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Equity 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
$57
1.14%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.14% [7]
AssetsNet $ 786,194,788
Holdings Count | Holding 45
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$786,194,788
# of Portfolio Holdings
45
Portfolio Turnover Rate
14%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.8%
Belgium
2.3%
Singapore
3.1%
Hong Kong
3.5%
Sweden
3.8%
Netherlands
5.3%
Spain
5.4%
Japan
8.6%
Switzerland
16.4%
France
18.5%
United Kingdom
26.3%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Nestle SA
5.0%
AstraZeneca PLC
4.6%
ASML Holding NV
4.2%
InterContinental Hotels Group PLC
3.6%
AIA Group Ltd.
3.5%
Roche Holding AG
3.4%
Compass Group PLC
3.4%
Iberdrola SA
3.4%
Schneider Electric SE
3.2%
LVMH Moet Hennessy Louis Vuitton SE
3.2%
Total
37.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000023778  
Shareholder Report [Line Items]  
Fund Name Calvert International Equity Fund
Class Name Class C
Trading Symbol CWVCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Equity 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 C
$94
1.89%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 94
Expense Ratio, Percent 1.89% [8]
AssetsNet $ 786,194,788
Holdings Count | Holding 45
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$786,194,788
# of Portfolio Holdings
45
Portfolio Turnover Rate
14%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.8%
Belgium
2.3%
Singapore
3.1%
Hong Kong
3.5%
Sweden
3.8%
Netherlands
5.3%
Spain
5.4%
Japan
8.6%
Switzerland
16.4%
France
18.5%
United Kingdom
26.3%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Nestle SA
5.0%
AstraZeneca PLC
4.6%
ASML Holding NV
4.2%
InterContinental Hotels Group PLC
3.6%
AIA Group Ltd.
3.5%
Roche Holding AG
3.4%
Compass Group PLC
3.4%
Iberdrola SA
3.4%
Schneider Electric SE
3.2%
LVMH Moet Hennessy Louis Vuitton SE
3.2%
Total
37.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000023779  
Shareholder Report [Line Items]  
Fund Name Calvert International Equity Fund
Class Name Class I
Trading Symbol CWVIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Equity 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 I
$44
0.89%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.89% [9]
AssetsNet $ 786,194,788
Holdings Count | Holding 45
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$786,194,788
# of Portfolio Holdings
45
Portfolio Turnover Rate
14%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.8%
Belgium
2.3%
Singapore
3.1%
Hong Kong
3.5%
Sweden
3.8%
Netherlands
5.3%
Spain
5.4%
Japan
8.6%
Switzerland
16.4%
France
18.5%
United Kingdom
26.3%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Nestle SA
5.0%
AstraZeneca PLC
4.6%
ASML Holding NV
4.2%
InterContinental Hotels Group PLC
3.6%
AIA Group Ltd.
3.5%
Roche Holding AG
3.4%
Compass Group PLC
3.4%
Iberdrola SA
3.4%
Schneider Electric SE
3.2%
LVMH Moet Hennessy Louis Vuitton SE
3.2%
Total
37.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000211925  
Shareholder Report [Line Items]  
Fund Name Calvert International Equity Fund
Class Name Class R6
Trading Symbol CIESX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Equity 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 R6
$42
0.85%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.85% [10]
AssetsNet $ 786,194,788
Holdings Count | Holding 45
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$786,194,788
# of Portfolio Holdings
45
Portfolio Turnover Rate
14%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
6.8%
Belgium
2.3%
Singapore
3.1%
Hong Kong
3.5%
Sweden
3.8%
Netherlands
5.3%
Spain
5.4%
Japan
8.6%
Switzerland
16.4%
France
18.5%
United Kingdom
26.3%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Nestle SA
5.0%
AstraZeneca PLC
4.6%
ASML Holding NV
4.2%
InterContinental Hotels Group PLC
3.6%
AIA Group Ltd.
3.5%
Roche Holding AG
3.4%
Compass Group PLC
3.4%
Iberdrola SA
3.4%
Schneider Electric SE
3.2%
LVMH Moet Hennessy Louis Vuitton SE
3.2%
Total
37.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000047589  
Shareholder Report [Line Items]  
Fund Name Calvert International Opportunities Fund
Class Name Class A
Trading Symbol CIOAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Opportunities 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
$66
1.35%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 66
Expense Ratio, Percent 1.35% [11]
AssetsNet $ 234,460,284
Holdings Count | Holding 86
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$234,460,284
# of Portfolio Holdings
86
Portfolio Turnover Rate
27%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
10.3%
Ireland
2.8%
Belgium
2.8%
Sweden
4.2%
Netherlands
5.3%
Australia
5.3%
Switzerland
6.1%
Germany
6.2%
Italy
7.9%
United Kingdom
23.6%
Japan
25.5%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Diploma PLC
2.3%
BAWAG Group AG
2.3%
FinecoBank Banca Fineco SpA
2.0%
Relo Group, Inc.
2.0%
Halma PLC
1.9%
Games Workshop Group PLC
1.8%
Makita Corp.
1.8%
Moncler SpA
1.8%
Euronext NV
1.8%
Babcock International Group PLC
1.8%
Total
19.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000047591  
Shareholder Report [Line Items]  
Fund Name Calvert International Opportunities Fund
Class Name Class C
Trading Symbol COICX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Opportunities 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 C
$102
2.10%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 102
Expense Ratio, Percent 2.10% [12]
AssetsNet $ 234,460,284
Holdings Count | Holding 86
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$234,460,284
# of Portfolio Holdings
86
Portfolio Turnover Rate
27%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
10.3%
Ireland
2.8%
Belgium
2.8%
Sweden
4.2%
Netherlands
5.3%
Australia
5.3%
Switzerland
6.1%
Germany
6.2%
Italy
7.9%
United Kingdom
23.6%
Japan
25.5%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Diploma PLC
2.3%
BAWAG Group AG
2.3%
FinecoBank Banca Fineco SpA
2.0%
Relo Group, Inc.
2.0%
Halma PLC
1.9%
Games Workshop Group PLC
1.8%
Makita Corp.
1.8%
Moncler SpA
1.8%
Euronext NV
1.8%
Babcock International Group PLC
1.8%
Total
19.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000047592  
Shareholder Report [Line Items]  
Fund Name Calvert International Opportunities Fund
Class Name Class I
Trading Symbol COIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Opportunities 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 I
$53
1.10%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.10% [13]
AssetsNet $ 234,460,284
Holdings Count | Holding 86
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$234,460,284
# of Portfolio Holdings
86
Portfolio Turnover Rate
27%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
10.3%
Ireland
2.8%
Belgium
2.8%
Sweden
4.2%
Netherlands
5.3%
Australia
5.3%
Switzerland
6.1%
Germany
6.2%
Italy
7.9%
United Kingdom
23.6%
Japan
25.5%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Diploma PLC
2.3%
BAWAG Group AG
2.3%
FinecoBank Banca Fineco SpA
2.0%
Relo Group, Inc.
2.0%
Halma PLC
1.9%
Games Workshop Group PLC
1.8%
Makita Corp.
1.8%
Moncler SpA
1.8%
Euronext NV
1.8%
Babcock International Group PLC
1.8%
Total
19.5%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-368-2745
C000211125  
Shareholder Report [Line Items]  
Fund Name Calvert International Opportunities Fund
Class Name Class R6
Trading Symbol COIRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calvert International Opportunities 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 R6
$50
1.02%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 50
Expense Ratio, Percent 1.02% [14]
AssetsNet $ 234,460,284
Holdings Count | Holding 86
InvestmentCompanyPortfolioTurnover 27.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$234,460,284
# of Portfolio Holdings
86
Portfolio Turnover Rate
27%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
10.3%
Ireland
2.8%
Belgium
2.8%
Sweden
4.2%
Netherlands
5.3%
Australia
5.3%
Switzerland
6.1%
Germany
6.2%
Italy
7.9%
United Kingdom
23.6%
Japan
25.5%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Diploma PLC
2.3%
BAWAG Group AG
2.3%
FinecoBank Banca Fineco SpA
2.0%
Relo Group, Inc.
2.0%
Halma PLC
1.9%
Games Workshop Group PLC
1.8%
Makita Corp.
1.8%
Moncler SpA
1.8%
Euronext NV
1.8%
Babcock International Group PLC
1.8%
Total
19.5%
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
[6] Annualized
[7] Annualized
[8] Annualized
[9] Annualized
[10] Annualized
[11] Annualized
[12] Annualized
[13] Annualized
[14] Annualized