This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of companies in emerging markets, including equity investments that are tied economically to emerging markets, that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to- middle-income economies as classified by the World Bank, and other countries or markets with similar emerging characteristics. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Normally investing primarily in equity securities.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Allocating investments across different emerging markets countries.In addition to the ESG ratings process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Availability Website Address [Text]

www.fidelity.com

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart, Year to Date Return, Date

Sep. 30, 2024

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return

9.02%

Lowest Quarterly Return, Date

Sep. 30, 2023

Performance Table Heading

Average Annual Returns

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Prospectus Line Items

Average Annual Return, Percent

11.06%

(8.97%)

^[4]

Prospectus Line Items

Average Annual Return, Percent

7.21%

(6.53%)

^[4]

Prospectus Line Items

Average Annual Return, Percent

6.16%

(10.99%)

Prospectus Line Items

Average Annual Return, Percent

9.86%

(7.44%)

Prospectus Line Items

Distribution and Service (12b-1) Fees

0.00%

Expenses (as a percentage of Assets)

2.54%

Net Expenses (as a percentage of Assets)

1.05%

Expense Example, with Redemption, 3 Years

598

Expense Example, with Redemption, 10 Years

$ 2,723

Average Annual Return, Label [Optional Text]

Return Before Taxes

Annual Return [Percent]

13.35%

Prospectus Line Items

Objective [Heading]

Investment Objective

Expense Heading [Optional Text]

Fee Table

Shareholder Fees Caption [Optional Text]

Shareholder fees

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

50.00%

Expense Example Narrative [Text Block]

This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of companies that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Normally investing primarily in non-U.S. securities. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors. Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Allocating investments across different countries and regions.In addition to the ESG ratings process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Availability Website Address [Text]

www.fidelity.com

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart, Year to Date Return, Date

Sep. 30, 2024

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return

11.66%

Lowest Quarterly Return, Date

Sep. 30, 2023

Performance Table Heading

Average Annual Returns

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Prospectus Line Items

Average Annual Return, Percent

13.13%

(5.27%)

^[8]

Prospectus Line Items

Average Annual Return, Percent

8.42%

(3.77%)

^[8]

Prospectus Line Items

Average Annual Return, Percent

18.82%

0.80%

Prospectus Line Items

Average Annual Return, Percent

18.49%

1.68%

Prospectus Line Items

Maximum Deferred Sales Charge (as a percentage)

^[9]

0.00%

Distribution and Service (12b-1) Fees

0.25%

Expenses (as a percentage of Assets)

4.87%

Net Expenses (as a percentage of Assets)

1.51%

Expense Example, with Redemption, 3 Years

1,569

Expense Example, with Redemption, 10 Years

4,956

Expense Example, No Redemption, 3 Years

1,569

Expense Example, No Redemption, 10 Years

$ 4,956

Average Annual Return, Label [Optional Text]

Return Before Taxes

Annual Return [Percent]

11.21%

Prospectus Line Items

Maximum Deferred Sales Charge (as a percentage)

^[9]

0.00%

Distribution and Service (12b-1) Fees

0.50%

Expenses (as a percentage of Assets)

5.05%

Net Expenses (as a percentage of Assets)

1.76%

Expense Example, with Redemption, 3 Years

1,427

Expense Example, with Redemption, 10 Years

4,977

Expense Example, No Redemption, 3 Years

1,427

Expense Example, No Redemption, 10 Years

$ 4,977

Average Annual Return, Label [Optional Text]

Return Before Taxes

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Management Fees (as a percentage of Assets)

^[10],[11]

0.90%

Other Expenses (as a percentage of Assets):

^[11]

3.65%

Fee Waiver or Reimbursement

^[12]

(3.29%)

Expenses Deferred Charges [Text Block]

On Class C shares redeemed less than one year after purchase.

Expense Example, with Redemption, 3 Years

1,260

Expense Example, with Redemption, 10 Years

5,046

Expense Example, No Redemption, 3 Years

1,260

Expense Example, No Redemption, 10 Years

$ 5,046

Average Annual Return, Label [Optional Text]

Return Before Taxes

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Management Fees (as a percentage of Assets)

^[10],[11]

0.90%

Other Expenses (as a percentage of Assets):

^[11]

3.65%

Fee Waiver or Reimbursement

^[12]

(3.29%)

Expense Example, with Redemption, 1 Year

$ 128

Expense Example, with Redemption, 5 Years

1,937

Expense Example, No Redemption, 1 Year

128

Expense Example, No Redemption, 5 Years

1,937

Annual Return, Inception Date

Feb. 10, 2022

Average Annual Return, Percent

11.34%

(8.84%)

^[17]

Prospectus Line Items

Maximum Deferred Sales Charge (as a percentage)

0.00%

Distribution and Service (12b-1) Fees

0.00%

Expenses (as a percentage of Assets)

4.48%

Net Expenses (as a percentage of Assets)

1.11%

Expense Example, with Redemption, 3 Years

939

Expense Example, with Redemption, 10 Years

4,329

Expense Example, No Redemption, 3 Years

939

Expense Example, No Redemption, 10 Years

$ 4,329

Average Annual Return, Label [Optional Text]

Return Before Taxes

Risk/Return [Heading]

Fund Summary Fund/Class: Fidelity® Sustainable Emerging Markets Equity Fund/Fidelity Advisor® Sustainable Emerging Markets Equity Fund A, M, C, I, Z

Objective, Primary [Text Block]

Fidelity® Sustainable Emerging Markets Equity Fund seeks capital appreciation.

Expense Narrative [Text Block]

The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 53 of the prospectus and in the sales charge waiver appendix to the prospectus.

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

108.00%

Expense Breakpoint Discounts [Text]

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 53 of the prospectus

Expenses Restated to Reflect Current [Text]

Adjusted to reflect current fees.

Strategy [Heading]

Principal Investment Strategies

Bar Chart and Performance Table [Heading]

Performance

Performance Information Illustrates Variability of Returns [Text]

The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart Narrative [Text Block]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year to Date Return, Label [Optional Text]

Year-to-Date Return

Bar Chart, Year to Date Return

14.29%

Highest Quarterly Return, Date

Dec. 31, 2023

Lowest Quarterly Return, Label [Optional Text]

Lowest Quarter Return

Lowest Quarterly Return

(5.69%)

Performance Table Does Reflect Sales Loads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions

Average Annual Return, Label [Optional Text]

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Return, Label [Optional Text]

MSCI Emerging Markets (EM) ESG Leaders Index

Average Annual Return, Label [Optional Text]

MSCI Emerging Markets Index

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

5.75%

Management Fees (as a percentage of Assets)

^[20],[21]

0.76%

Other Expenses (as a percentage of Assets):

^[21]

1.77%

Fee Waiver or Reimbursement

^[22]

(1.48%)

Expense Example, with Redemption, 1 Year

$ 700

Expense Example, with Redemption, 5 Years

1,792

Expense Example, No Redemption, 1 Year

700

Expense Example, No Redemption, 5 Years

1,792

Annual Return, Inception Date

Feb. 10, 2022

Average Annual Return, Percent

6.54%

(8.30%)

^[23]

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

3.50%

Management Fees (as a percentage of Assets)

^[20],[21]

0.73%

Other Expenses (as a percentage of Assets):

^[21]

1.77%

Fee Waiver or Reimbursement

^[22]

(1.45%)

Expense Example, with Redemption, 1 Year

$ 502

Expense Example, with Redemption, 5 Years

1,705

Expense Example, No Redemption, 1 Year

502

Expense Example, No Redemption, 5 Years

1,705

Annual Return, Inception Date

Feb. 10, 2022

Average Annual Return, Percent

8.91%

(7.39%)

^[24]

Prospectus Line Items

Maximum Deferred Sales Charge (as a percentage)

^[25]

1.00%

Distribution and Service (12b-1) Fees

1.00%

Expenses (as a percentage of Assets)

3.49%

Net Expenses (as a percentage of Assets)

2.05%

Expense Example, with Redemption, 1 Year

$ 308

Expense Example, with Redemption, 5 Years

1,645

Expense Example, No Redemption, 1 Year

208

Expense Example, No Redemption, 5 Years

1,645

Annual Return, Inception Date

Feb. 10, 2022

Average Annual Return, Percent

11.25%

(6.10%)

^[26]

Prospectus Line Items

Maximum Deferred Sales Charge (as a percentage)

0.00%

Distribution and Service (12b-1) Fees

0.00%

Expenses (as a percentage of Assets)

2.50%

Net Expenses (as a percentage of Assets)

1.05%

Expense Example, with Redemption, 3 Years

591

Expense Example, with Redemption, 10 Years

2,687

Expense Example, No Redemption, 3 Years

591

Expense Example, No Redemption, 10 Years

$ 2,687

Average Annual Return, Label [Optional Text]

Return Before Taxes

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

0.00%

Management Fees (as a percentage of Assets)

^[20],[21]

0.67%

Other Expenses (as a percentage of Assets):

^[21]

1.77%

Fee Waiver or Reimbursement

^[22]

(1.54%)

Expense Example, with Redemption, 1 Year

$ 92

Expense Example, with Redemption, 5 Years

1,112

Expense Example, No Redemption, 1 Year

92

Expense Example, No Redemption, 5 Years

1,112

Annual Return, Inception Date

Feb. 10, 2022

Average Annual Return, Percent

13.46%

(5.05%)

^[28]

Prospectus Line Items

Objective [Heading]

Investment Objective

Expense Heading [Optional Text]

Fee Table

Shareholder Fees Caption [Optional Text]

Shareholder fees

Fee Waiver or Reimbursement over Assets, Date of Termination

Feb. 28, 2026

Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 50% of the average value of its portfolio.

Expenses Deferred Charges [Text Block]

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Expense Example Narrative [Text Block]

This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of companies that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Normally investing primarily in non-U.S. securities. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors. Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Allocating investments across different countries and regions.In addition to the ESG ratings process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit institutional.fidelity.com for more recent performance information.

Performance Availability Website Address [Text]

institutional.fidelity.com

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart Does Not Reflect Sales Loads [Text]

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart, Year to Date Return, Date

Sep. 30, 2024

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return

11.64%

Lowest Quarterly Return, Date

Sep. 30, 2023

Performance Table Heading

Average Annual Returns

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table One Class of after Tax Shown [Text]

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Narrative

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Prospectus Line Items

Average Annual Return, Percent

6.40%

(8.36%)

^[23]

Prospectus Line Items

Average Annual Return, Percent

4.32%

(6.13%)

^[23]

Prospectus Line Items

Average Annual Return, Percent

18.82%

0.80%

Prospectus Line Items

Average Annual Return, Percent

18.49%

1.68%

Prospectus Line Items

Distribution and Service (12b-1) Fees

0.00%

Expenses (as a percentage of Assets)

1.58%

Net Expenses (as a percentage of Assets)

0.95%

Expense Example, with Redemption, 3 Years

415

Expense Example, with Redemption, 10 Years

$ 1,806

Average Annual Return, Label [Optional Text]

Return Before Taxes

Annual Return [Percent]

11.67%

Prospectus Line Items

Objective [Heading]

Investment Objective

Expense Heading [Optional Text]

Fee Table

Shareholder Fees Caption [Optional Text]

Shareholder fees

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

103.00%

Expense Example Narrative [Text Block]

This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of companies in emerging markets, including equity investments that are tied economically to emerging markets, that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to- middle-income economies as classified by the World Bank, and other countries or markets with similar emerging characteristics. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Normally investing primarily in equity securities.Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers.Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Allocating investments across different emerging markets countries.In addition to the ESG ratings process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Availability Website Address [Text]

www.fidelity.com

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart, Year to Date Return, Date

Sep. 30, 2024

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return

9.27%

Lowest Quarterly Return, Date

Sep. 30, 2023

Performance Table Heading

Average Annual Returns

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Prospectus Line Items

Average Annual Return, Percent

11.41%

(1.58%)

^[31]

Prospectus Line Items

Average Annual Return, Percent

7.11%

(1.00%)

^[31]

Prospectus Line Items

Average Annual Return, Percent

6.16%

(5.30%)

Prospectus Line Items

Average Annual Return, Percent

9.86%

(2.17%)

Prospectus Line Items

Distribution and Service (12b-1) Fees

0.00%

Expenses (as a percentage of Assets)

1.03%

Net Expenses (as a percentage of Assets)

0.75%

Expense Example, with Redemption, 3 Years

290

Expense Example, with Redemption, 10 Years

$ 1,225

Average Annual Return, Label [Optional Text]

Return Before Taxes

Annual Return [Percent]

13.36%

Prospectus Line Items

Objective [Heading]

Investment Objective

Expense Heading [Optional Text]

Fee Table

Shareholder Fees Caption [Optional Text]

Shareholder fees

Operating Expenses Caption [Optional Text]

Annual Operating Expenses

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover, Rate

45.00%

Expense Example Narrative [Text Block]

This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy Narrative [Text Block]

Normally investing at least 80% of assets in equity securities of companies that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have proven or improving sustainability practices based on an evaluation of such companies' individual environmental, social and governance (ESG) profile. Equity securities represent an ownership interest, or the right to acquire an ownership interest, in an issuer. Equity securities include common stocks (including depositary receipts evidencing ownership of common stock), preferred stocks and other preferred securities, convertible securities, rights and warrants, and other securities, such as hybrid securities and trust preferred securities, believed to have equity-like characteristics. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Normally investing primarily in non-U.S. securities. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. The Adviser considers a number of factors to determine whether an issuer is located in or tied economically to a particular country or region including: whether a third-party vendor has assigned a particular country or region classification to the issuer or included the issuer in an index representative of a particular country or region; the issuer's domicile, incorporation, and location of assets; whether the issuer derives at least 50% of its revenues from, or has at least 50% of its assets in, a particular country or region; the source of government guarantees (if any); and the primary trading market or listing exchange. Whether an issuer is located in or tied economically to a particular country can be determined under any of these factors. Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers.Investing in issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. Allocating investments across different countries and regions.In addition to the ESG ratings process, using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

Performance Narrative [Text Block]

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the performance of the fund's shares over the past year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.

Performance Availability Website Address [Text]

www.fidelity.com

Bar Chart [Heading]

Year-by-Year Returns

Bar Chart, Year to Date Return, Date

Sep. 30, 2024

Highest Quarterly Return, Label [Optional Text]

Highest Quarter Return

Highest Quarterly Return

11.48%

Lowest Quarterly Return, Date

Sep. 30, 2023

Performance Table Heading

Average Annual Returns

Performance Table Not Relevant to Tax Deferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.