Risk/Return Detail Data - FidelityInfrastructureFund-PRO - USD ($)			12 Months Ended											24 Months Ended		36 Months Ended		60 Months Ended	72 Months Ended		84 Months Ended		96 Months Ended		120 Months Ended
		Dec. 30, 2025	Dec. 30, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 30, 2025		Dec. 30, 2025		Dec. 30, 2025	Dec. 30, 2025		Dec. 30, 2025		Dec. 30, 2025		Dec. 30, 2025
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)	[1]	0.92%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		2.68%
Expenses (as a percentage of Assets)		3.60%
Fee Waiver or Reimbursement	[2]	(2.35%)
Net Expenses (as a percentage of Assets)		1.25%
Expense Example, with Redemption, 1 Year		$ 127
Expense Example, with Redemption, 3 Years		807
Expense Example, with Redemption, 5 Years		1,592
Expense Example, with Redemption, 10 Years		$ 3,652
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.87%													(3.99%)	[3]
Annual Return [Percent]				5.87%	11.34%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund /Class: Fidelity® Sustainable Emerging Markets Equity Fund /Fidelity® Sustainable Emerging Markets Equity Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Sustainable Emerging Markets Equity Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 94 % of the average value of its portfolio.
Portfolio Turnover, Rate		94.00%
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 [Heading]		Principal Investment Strategies
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 that the Adviser identifies as having similar emerging markets 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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		33.64%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		9.02%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(7.56%)
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 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.
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.
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | After Taxes on Distributions | Fidelity Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			5.88%													(4.08%)	[3]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | After Taxes on Distributions and Sales | Fidelity Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.06%													(2.82%)	[3]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | IXWRU
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets (EM) ESG Leaders Index
Average Annual Return, Percent			13.20%													(3.26%)
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%													(2.52%)
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Sustainable International Equity Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)	[4]	0.76%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		1.30%
Expenses (as a percentage of Assets)		2.06%
Fee Waiver or Reimbursement	[5]	(1.01%)
Net Expenses (as a percentage of Assets)		1.05%
Expense Example, with Redemption, 1 Year		$ 107
Expense Example, with Redemption, 3 Years		514
Expense Example, with Redemption, 5 Years		982
Expense Example, with Redemption, 10 Years		$ 2,280
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			7.87%													(0.84%)	[6]
Annual Return [Percent]				7.87%	13.35%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund /Class: Fidelity® Sustainable International Equity Fund /Fidelity® Sustainable International Equity Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Sustainable International Equity Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 49 % of the average value of its portfolio.
Portfolio Turnover, Rate		49.00%
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 [Heading]		Principal Investment Strategies
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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		19.85%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		11.66%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Sep. 30, 2023
Lowest Quarterly Return		(7.67%)
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 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.
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.
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund | After Taxes on Distributions | Fidelity Sustainable International Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			7.55%													(1.01%)	[6]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund | After Taxes on Distributions and Sales | Fidelity Sustainable International Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			5.17%													(0.50%)	[6]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund | IXWRT
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE ESG Leaders
Average Annual Return, Percent			2.25%													1.30%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-RetailComboPRO | Fidelity Sustainable International Equity Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%													2.50%
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund | Fidelity Series Select International Small Cap Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.01%
Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		6
Expense Example, with Redemption, 10 Years		$ 13
Annual Return, Inception Date		Nov. 04, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			(0.88%)													11.18%	[7]
Annual Return [Percent]				(0.88%)	15.13%
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Select International Small Cap Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Select International Small Cap Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 13 % of the average value of its portfolio.
Portfolio Turnover, Rate		13.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing primarily in non-U.S. securities, including securities of issuers located in emerging markets. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. 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 that the Adviser identifies as having similar emerging markets 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. Normally investing at least 80% of assets in securities of companies with small market capitalizations . The Adviser generally defines small market capitalization companies as those whose market capitalization is similar to the market capitalization of companies in the MSCI EAFE Small Cap Index or the MSCI ACWI ex USA Small Cap Index . 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. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		26.45%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		11.58%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(8.90%)
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 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.
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.
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund | After Taxes on Distributions | Fidelity Series Select International Small Cap Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			(2.47%)													9.38%	[7]
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund | After Taxes on Distributions and Sales | Fidelity Series Select International Small Cap Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			0.72%													8.40%	[7]
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%													15.21%
FidelitySeriesSelectInternationalSmallCapFund-PRO | Fidelity Series Select International Small Cap Fund | MS141
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Small Cap Index
Average Annual Return, Percent			2.01%													11.96%
FidelitySAIInternationalSMACompletionFund-PRO | Fidelity SAI International SMA Completion Fund | Fidelity SAI International SMA Completion Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.00%
Expenses (as a percentage of Assets)		0.00%
Expense Example, with Redemption, 1 Year		$ 0
Expense Example, with Redemption, 3 Years		0
Expense Example, with Redemption, 5 Years		0
Expense Example, with Redemption, 10 Years		$ 0
Annual Return, Inception Date		Apr. 11, 2019
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			3.63%															3.16%	5.03%	[8]
Annual Return [Percent]				3.63%	15.84%	(28.32%)	9.94%	23.49%
FidelitySAIInternationalSMACompletionFund-PRO | Fidelity SAI International SMA Completion Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® SAI International SMA Completion Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® SAI International SMA Completion Fund seeks capital growth.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 52 % of the average value of its portfolio.
Portfolio Turnover, Rate		52.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing primarily in non-U.S. securities, including securities of issuers located in emerging markets. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. 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 that the Adviser identifies as having similar emerging markets 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. Normally investing primarily in equity securities. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		22.73%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		22.05%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Jun. 30, 2022
Lowest Quarterly Return		(19.97%)
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 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.
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.
FidelitySAIInternationalSMACompletionFund-PRO | Fidelity SAI International SMA Completion Fund | After Taxes on Distributions | Fidelity SAI International SMA Completion Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			3.00%															2.59%	4.52%	[8]
FidelitySAIInternationalSMACompletionFund-PRO | Fidelity SAI International SMA Completion Fund | After Taxes on Distributions and Sales | Fidelity SAI International SMA Completion Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			2.57%															2.50%	3.99%	[8]
FidelitySAIInternationalSMACompletionFund-PRO | Fidelity SAI International SMA Completion Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%															4.95%	5.88%
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund | Fidelity Infrastructure Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.81%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.13%
Expenses (as a percentage of Assets)		0.94%
Expense Example, with Redemption, 1 Year		$ 96
Expense Example, with Redemption, 3 Years		300
Expense Example, with Redemption, 5 Years		520
Expense Example, with Redemption, 10 Years		$ 1,155
Annual Return, Inception Date		Nov. 05, 2019
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			14.42%															6.83%	7.72%	[9]
Annual Return [Percent]				14.42%	8.44%	(7.58%)	7.58%	12.80%
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Infrastructure Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Infrastructure Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 115 % of the average value of its portfolio.
Portfolio Turnover, Rate		115.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of companies that own, operate, or are involved in the distribution, development, and service of infrastructure-related assets. Such companies may include those involved in transportation and supply chain infrastructure, such as airports, highways, railroads, marine ports, and warehouse and logistics facilities; utilities infrastructure, such as electric, water, gas, renewable electricity, and multi-utilities; energy infrastructure, such as oil, gas, and electricity storage and transportation; and communications and digital infrastructure, such as cell towers, data centers and internet infrastructure, and satellites; as well as other infrastructure companies. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. 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 fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. Investing in either "growth" stocks or "value" stocks or both. Investing in securities of domestic and foreign issuers.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		24.56%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		14.74%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(15.41%)
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 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.
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.
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund | After Taxes on Distributions | Fidelity Infrastructure Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			13.98%															6.54%	7.42%	[9]
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund | After Taxes on Distributions and Sales | Fidelity Infrastructure Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			8.84%															5.35%	6.08%	[9]
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund | MS159
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI ACWI (All Country World Index) Index
Average Annual Return, Percent			17.87%															10.44%	11.09%
FidelityInfrastructureFund-PRO | Fidelity Infrastructure Fund | SP212
Prospectus Line Items
Average Annual Return, Label [Optional Text]			S&P® Global Infrastructure Index
Average Annual Return, Percent			15.10%															5.28%	5.86%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Fund | Fidelity Series Emerging Markets Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.02%
Expenses (as a percentage of Assets)		0.02%
Fee Waiver or Reimbursement	[10]	(0.01%)
Net Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		8
Expense Example, with Redemption, 10 Years		$ 22
Annual Return, Inception Date		Aug. 29, 2018
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.42%															0.16%			0.17%	[11]
Annual Return [Percent]				5.42%	12.10%	(24.50%)	(4.14%)	17.85%	9.63%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Emerging Markets Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Emerging Markets Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		February 28, 2029
Portfolio Turnover [Heading]		Portfolio Turnover
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 100 % of the average value of its portfolio.
Portfolio Turnover, Rate		100.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of issuers in emerging markets and other investments that are tied economically to emerging markets. 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 that the Adviser identifies as having similar emerging markets 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. 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 common stocks. Allocating investments across different emerging markets countries. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		32.95%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2020
Highest Quarterly Return		21.97%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(27.46%)
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 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.
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.
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Fund | After Taxes on Distributions | Fidelity Series Emerging Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			5.01%															(0.48%)			(0.47%)	[11]
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Fund | After Taxes on Distributions and Sales | Fidelity Series Emerging Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			3.98%															0.07%			0.06%	[11]
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%															1.71%			2.52%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Opportunities Fund | Fidelity Series Emerging Markets Opportunities Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.02%
Expenses (as a percentage of Assets)		0.02%
Fee Waiver or Reimbursement	[12]	(0.01%)
Net Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		8
Expense Example, with Redemption, 10 Years		$ 22
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			7.84%															2.09%							5.01%
Annual Return [Percent]				7.84%	14.23%	(23.95%)	(5.11%)	24.72%	28.85%	(16.09%)	40.44%	10.95%	(12.74%)
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Opportunities Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Emerging Markets Opportunities Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Emerging Markets Opportunities Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		February 28, 2029
Portfolio Turnover [Heading]		Portfolio Turnover
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 45 % of the average value of its portfolio.
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of issuers in emerging markets and other investments that are tied economically to emerging markets. 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 that the Adviser identifies as having similar emerging markets 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. 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 common stocks. Allocating investments across different emerging markets countries. Allocating the fund's assets across different market sectors (at present, communication services, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, and utilities), using different Fidelity managers. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		30.35%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		23.12%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(24.53%)
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 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.
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.
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Opportunities Fund | After Taxes on Distributions | Fidelity Series Emerging Markets Opportunities Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			7.67%															1.02%							4.01%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Opportunities Fund | After Taxes on Distributions and Sales | Fidelity Series Emerging Markets Opportunities Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			5.37%															1.59%							3.86%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series Emerging Markets Opportunities Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%															1.71%							3.66%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund | Fidelity Series International Growth Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.00%
Expenses (as a percentage of Assets)		0.00%
Expense Example, with Redemption, 1 Year		$ 0
Expense Example, with Redemption, 3 Years		0
Expense Example, with Redemption, 5 Years		0
Expense Example, with Redemption, 10 Years		$ 0
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.95%															6.59%							8.10%
Annual Return [Percent]				5.95%	21.73%	(22.88%)	16.61%	18.61%	35.56%	(10.87%)	30.21%	(3.54%)	4.34%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series International Growth Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series International Growth Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 36 % of the average value of its portfolio.
Portfolio Turnover, Rate		36.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of growth companies. Growth companies are companies the Adviser believes have above average growth potential. The Adviser considers a number of factors in determining a company's growth potential, such as whether the company is included in a third-party growth benchmark or classified as a growth company by a third-party vendor, if the company's projected earnings per share growth, sales growth per share or free cash flow growth or its trailing earnings per share growth is above the equity market median, if the company's research and development expenses exceed sales, general and administrative expenses, or if the company is raising capital to grow, fund or expand its business. A company's growth potential can be determined under any of these factors. 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, including securities of issuers located in emerging markets. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. 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 that the Adviser identifies as having similar emerging markets 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. Normally investing primarily in common stocks. Allocating investments across countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		18.47%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		18.37%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(17.35%)
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 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.
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.
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund | After Taxes on Distributions | Fidelity Series International Growth Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			4.98%															4.98%							6.77%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund | After Taxes on Distributions and Sales | Fidelity Series International Growth Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.32%															5.00%							6.33%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%															4.95%							5.41%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Growth Fund | MS270
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Growth Index
Average Annual Return, Percent			2.20%															4.15%							6.01%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund | Fidelity Series International Small Cap Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.01%
Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		6
Expense Example, with Redemption, 10 Years		$ 13
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.03%															5.34%							7.58%
Annual Return [Percent]				5.03%	18.36%	(26.27%)	18.33%	19.61%	28.20%	(13.06%)	34.46%	(2.40%)	9.44%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series International Small Cap Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series International Small Cap Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 37 % of the average value of its portfolio.
Portfolio Turnover, Rate		37.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing primarily in non-U.S. securities, including securities of issuers located in emerging markets. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. 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 that the Adviser identifies as having similar emerging markets 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. Normally investing at least 80% of assets in securities of companies with small market capitalizations . The Adviser generally defines small market capitalization companies as those whose market capitalization is similar to the market capitalization of companies in the MSCI EAFE Small Cap Index or the MSCI ACWI ex USA Small Cap Index . 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 common stocks. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		25.37%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		19.52%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(22.76%)
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 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.
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.
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund | After Taxes on Distributions | Fidelity Series International Small Cap Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			2.67%															3.77%							5.95%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund | After Taxes on Distributions and Sales | Fidelity Series International Small Cap Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.57%															4.15%							5.86%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%															4.95%							5.41%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Small Cap Fund | MS141
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Small Cap Index
Average Annual Return, Percent			2.01%															2.47%							5.69%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund | Fidelity Series International Value Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.01%
Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		6
Expense Example, with Redemption, 10 Years		$ 13
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			6.77%															7.79%							5.74%
Annual Return [Percent]				6.77%	20.33%	(7.21%)	16.38%	4.89%	19.83%	(16.35%)	20.43%	(1.57%)	1.05%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series International Value Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series International Value Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 29 % of the average value of its portfolio.
Portfolio Turnover, Rate		29.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of value companies. Value companies are companies the Adviser believes are undervalued in the marketplace. The Adviser considers traditional and other measures of value, such as whether the company is included in a third-party value benchmark or classified as a value company by a third-party vendor, whether the company's free cash flow yield is above the equity market median, whether the company's enterprise value (the total value of a company's outstanding equity and debt) relative to earnings is below the equity market median, or whether the company's price-to-book (P/B) ratio or projected price-to-earnings (P/E) ratio is below the equity market median. An issuer may be determined to be a value company under any of these factors. 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, including securities of issuers located in emerging markets. The Adviser considers non-U.S. securities to include investments that are tied economically to a particular country or region outside the U.S. 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 that the Adviser identifies as having similar emerging markets 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. Normally investing primarily in common stocks. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		37.50%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2022
Highest Quarterly Return		20.66%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(27.88%)
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 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.
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.
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund | After Taxes on Distributions | Fidelity Series International Value Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			5.64%															6.73%							4.79%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund | After Taxes on Distributions and Sales | Fidelity Series International Value Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.81%															5.92%							4.34%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%															4.95%							5.41%
FidelitySeriesInternationalFunds-ComboPRO | Fidelity Series International Value Fund | MS158
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Value Index
Average Annual Return, Percent			6.03%															5.37%							4.58%
FidelitySeriesCanadaFund-PRO | Fidelity Series Canada Fund | Fidelity Series Canada Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.00%
Expenses (as a percentage of Assets)		0.00%
Expense Example, with Redemption, 1 Year		$ 0
Expense Example, with Redemption, 3 Years		0
Expense Example, with Redemption, 5 Years		0
Expense Example, with Redemption, 10 Years		$ 0
Annual Return, Inception Date		Aug. 15, 2017
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			9.89%															9.78%					9.13%	[13]
Annual Return [Percent]				9.89%	15.93%	(6.85%)	28.62%	4.48%	27.76%	(15.00%)
FidelitySeriesCanadaFund-PRO | Fidelity Series Canada Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Canada Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Canada Fund seeks growth of capital over the long term.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 13 % of the average value of its portfolio.
Portfolio Turnover, Rate		13.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of Canadian issuers and other investments that are tied economically to Canada. 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. 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. Potentially investing in securities of U.S. issuers. Normally investing primarily in common stocks. Investing up to 35% of total assets in any industry that accounts for more than 20% of the Canadian market. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		22.26%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2020
Highest Quarterly Return		15.31%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(26.57%)
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 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.
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.
FidelitySeriesCanadaFund-PRO | Fidelity Series Canada Fund | After Taxes on Distributions | Fidelity Series Canada Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			8.92%															8.85%					8.26%	[13]
FidelitySeriesCanadaFund-PRO | Fidelity Series Canada Fund | After Taxes on Distributions and Sales | Fidelity Series Canada Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			6.20%															7.44%					7.04%	[13]
FidelitySeriesCanadaFund-PRO | Fidelity Series Canada Fund | MS400
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Canada Index
Average Annual Return, Percent			12.23%															8.69%					8.17%
FidelitySeriesOverseasFund-PRO | Fidelity Series Overseas Fund | Fidelity Series Overseas Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.01%
Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		6
Expense Example, with Redemption, 10 Years		$ 13
Annual Return, Inception Date		Jun. 21, 2019
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.88%															6.56%	7.42%	[14]
Annual Return [Percent]				5.88%	21.48%	(23.26%)	19.59%	16.37%
FidelitySeriesOverseasFund-PRO | Fidelity Series Overseas Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Overseas Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Overseas Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 49 % of the average value of its portfolio.
Portfolio Turnover, Rate		49.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets 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. 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 common stocks. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		20.76%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Jun. 30, 2020
Highest Quarterly Return		19.31%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(19.76%)
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 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.
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.
FidelitySeriesOverseasFund-PRO | Fidelity Series Overseas Fund | After Taxes on Distributions | Fidelity Series Overseas Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			5.44%															6.12%	7.00%	[14]
FidelitySeriesOverseasFund-PRO | Fidelity Series Overseas Fund | After Taxes on Distributions and Sales | Fidelity Series Overseas Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			3.99%															5.17%	5.87%	[14]
FidelitySeriesOverseasFund-PRO | Fidelity Series Overseas Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%															4.95%	5.88%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class A
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		5.75%
Maximum Deferred Sales Charge (as a percentage)	[15]	0.00%
Management Fees (as a percentage of Assets)	[16]	0.97%
Distribution and Service (12b-1) Fees		0.25%
Other Expenses (as a percentage of Assets):		2.72%
Expenses (as a percentage of Assets)		3.94%
Fee Waiver or Reimbursement	[17]	(2.44%)
Net Expenses (as a percentage of Assets)		1.50%
Expense Example, with Redemption, 1 Year		$ 719
Expense Example, with Redemption, 3 Years		1,420
Expense Example, with Redemption, 5 Years		2,220
Expense Example, with Redemption, 10 Years		4,295
Expense Example, No Redemption, 1 Year		719
Expense Example, No Redemption, 3 Years		1,420
Expense Example, No Redemption, 5 Years		2,220
Expense Example, No Redemption, 10 Years		$ 4,295
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			(0.42%)													(6.15%)	[18]
Annual Return [Percent]				5.65%	11.21%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class M
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		3.50%
Maximum Deferred Sales Charge (as a percentage)	[15]	0.00%
Management Fees (as a percentage of Assets)	[16]	0.91%
Distribution and Service (12b-1) Fees		0.50%
Other Expenses (as a percentage of Assets):		2.86%
Expenses (as a percentage of Assets)		4.27%
Fee Waiver or Reimbursement	[17]	(2.52%)
Net Expenses (as a percentage of Assets)		1.75%
Expense Example, with Redemption, 1 Year		$ 522
Expense Example, with Redemption, 3 Years		1,300
Expense Example, with Redemption, 5 Years		2,177
Expense Example, with Redemption, 10 Years		4,426
Expense Example, No Redemption, 1 Year		522
Expense Example, No Redemption, 3 Years		1,300
Expense Example, No Redemption, 5 Years		2,177
Expense Example, No Redemption, 10 Years		$ 4,426
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			1.68%													(5.63%)	[19]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class C
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)	[20]	1.00%
Management Fees (as a percentage of Assets)	[16]	0.91%
Distribution and Service (12b-1) Fees		1.00%
Other Expenses (as a percentage of Assets):		2.90%
Expenses (as a percentage of Assets)		4.81%
Fee Waiver or Reimbursement	[17]	(2.56%)
Net Expenses (as a percentage of Assets)		2.25%
Expenses Deferred Charges [Text Block]		On Class C shares redeemed less than one year after purchase.
Expense Example, with Redemption, 1 Year		$ 328
Expense Example, with Redemption, 3 Years		1,137
Expense Example, with Redemption, 5 Years		2,139
Expense Example, with Redemption, 10 Years		4,486
Expense Example, No Redemption, 1 Year		228
Expense Example, No Redemption, 3 Years		1,137
Expense Example, No Redemption, 5 Years		2,139
Expense Example, No Redemption, 10 Years		$ 4,486
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			3.97%													(4.91%)	[21]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class I
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)	[16]	0.91%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		2.87%
Expenses (as a percentage of Assets)		3.78%
Fee Waiver or Reimbursement	[17]	(2.53%)
Net Expenses (as a percentage of Assets)		1.25%
Expense Example, with Redemption, 1 Year		$ 127
Expense Example, with Redemption, 3 Years		838
Expense Example, with Redemption, 5 Years		1,658
Expense Example, with Redemption, 10 Years		3,798
Expense Example, No Redemption, 1 Year		127
Expense Example, No Redemption, 3 Years		838
Expense Example, No Redemption, 5 Years		1,658
Expense Example, No Redemption, 10 Years		$ 3,798
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.96%													(3.96%)	[22]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class Z
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)	[16]	0.84%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		3.02%
Expenses (as a percentage of Assets)		3.86%
Fee Waiver or Reimbursement	[17]	(2.76%)
Net Expenses (as a percentage of Assets)		1.10%
Expense Example, with Redemption, 1 Year		$ 112
Expense Example, with Redemption, 3 Years		832
Expense Example, with Redemption, 5 Years		1,670
Expense Example, with Redemption, 10 Years		3,848
Expense Example, No Redemption, 1 Year		112
Expense Example, No Redemption, 3 Years		832
Expense Example, No Redemption, 5 Years		1,670
Expense Example, No Redemption, 10 Years		$ 3,848
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			6.12%													(3.83%)	[23]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund
Prospectus Line Items
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 [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Sustainable Emerging Markets Equity Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 94 % of the average value of its portfolio.
Portfolio Turnover, Rate		94.00%
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 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
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 [Heading]		Principal Investment Strategies
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 that the Adviser identifies as having similar emerging markets 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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		institutional.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
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.
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.
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		33.37%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		9.03%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(7.55%)
Performance Table Heading		Average Annual Returns
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 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 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 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 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.
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.
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | After Taxes on Distributions | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			(0.28%)													(6.14%)	[18]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | After Taxes on Distributions and Sales | Fidelity Advisor Sustainable Emerging Markets Equity Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			0.30%													(4.40%)	[18]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | IXWRU
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets (EM) ESG Leaders Index
Average Annual Return, Percent			13.20%													(3.26%)
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable Emerging Markets Equity Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%													(2.52%)
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Advisor Sustainable International Equity Fund - Class A
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		5.75%
Maximum Deferred Sales Charge (as a percentage)	[24]	0.00%
Management Fees (as a percentage of Assets)	[25]	0.76%
Distribution and Service (12b-1) Fees		0.25%
Other Expenses (as a percentage of Assets):		1.35%
Expenses (as a percentage of Assets)		2.36%
Fee Waiver or Reimbursement	[26]	(1.06%)
Net Expenses (as a percentage of Assets)		1.30%
Expense Example, with Redemption, 1 Year		$ 700
Expense Example, with Redemption, 3 Years		1,140
Expense Example, with Redemption, 5 Years		1,640
Expense Example, with Redemption, 10 Years		3,012
Expense Example, No Redemption, 1 Year		700
Expense Example, No Redemption, 3 Years		1,140
Expense Example, No Redemption, 5 Years		1,640
Expense Example, No Redemption, 10 Years		$ 3,012
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			1.36%													(3.10%)	[27]
Annual Return [Percent]				7.54%	13.04%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Advisor Sustainable International Equity Fund - Class M
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		3.50%
Maximum Deferred Sales Charge (as a percentage)	[24]	0.00%
Management Fees (as a percentage of Assets)	[25]	0.73%
Distribution and Service (12b-1) Fees		0.50%
Other Expenses (as a percentage of Assets):		1.28%
Expenses (as a percentage of Assets)		2.51%
Fee Waiver or Reimbursement	[26]	(0.96%)
Net Expenses (as a percentage of Assets)		1.55%
Expense Example, with Redemption, 1 Year		$ 502
Expense Example, with Redemption, 3 Years		985
Expense Example, with Redemption, 5 Years		1,526
Expense Example, with Redemption, 10 Years		3,002
Expense Example, No Redemption, 1 Year		502
Expense Example, No Redemption, 3 Years		985
Expense Example, No Redemption, 5 Years		1,526
Expense Example, No Redemption, 10 Years		$ 3,002
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			3.50%													(2.56%)	[28]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Advisor Sustainable International Equity Fund - Class C
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)	[29]	1.00%
Management Fees (as a percentage of Assets)	[25]	0.72%
Distribution and Service (12b-1) Fees		1.00%
Other Expenses (as a percentage of Assets):		1.36%
Expenses (as a percentage of Assets)		3.08%
Fee Waiver or Reimbursement	[26]	(1.03%)
Net Expenses (as a percentage of Assets)		2.05%
Expenses Deferred Charges [Text Block]		On Class C shares redeemed less than one year after purchase.
Expense Example, with Redemption, 1 Year		$ 308
Expense Example, with Redemption, 3 Years		820
Expense Example, with Redemption, 5 Years		1,494
Expense Example, with Redemption, 10 Years		3,126
Expense Example, No Redemption, 1 Year		208
Expense Example, No Redemption, 3 Years		820
Expense Example, No Redemption, 5 Years		1,494
Expense Example, No Redemption, 10 Years		$ 3,126
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.78%													(1.83%)	[30]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Advisor Sustainable International Equity Fund - Class I
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)	[25]	0.73%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		1.37%
Expenses (as a percentage of Assets)		2.10%
Fee Waiver or Reimbursement	[26]	(1.05%)
Net Expenses (as a percentage of Assets)		1.05%
Expense Example, with Redemption, 1 Year		$ 107
Expense Example, with Redemption, 3 Years		521
Expense Example, with Redemption, 5 Years		998
Expense Example, with Redemption, 10 Years		2,318
Expense Example, No Redemption, 1 Year		107
Expense Example, No Redemption, 3 Years		521
Expense Example, No Redemption, 5 Years		998
Expense Example, No Redemption, 10 Years		$ 2,318
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			7.86%													(0.84%)	[31]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | Fidelity Advisor Sustainable International Equity Fund - Class Z
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)	[25]	0.67%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		1.45%
Expenses (as a percentage of Assets)		2.12%
Fee Waiver or Reimbursement	[26]	(1.22%)
Net Expenses (as a percentage of Assets)		0.90%
Expense Example, with Redemption, 1 Year		$ 92
Expense Example, with Redemption, 3 Years		504
Expense Example, with Redemption, 5 Years		987
Expense Example, with Redemption, 10 Years		2,321
Expense Example, No Redemption, 1 Year		92
Expense Example, No Redemption, 3 Years		504
Expense Example, No Redemption, 5 Years		987
Expense Example, No Redemption, 10 Years		$ 2,321
Annual Return, Inception Date		Feb. 10, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			8.03%													(0.71%)	[32]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund /Class: Fidelity® Sustainable International Equity Fund /Fidelity Advisor® Sustainable International Equity Fund A, M, C, I, Z
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Sustainable International Equity Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 49 % of the average value of its portfolio.
Portfolio Turnover, Rate		49.00%
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 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
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 [Heading]		Principal Investment Strategies
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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		institutional.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
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.
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.
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		19.74%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		11.64%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Sep. 30, 2023
Lowest Quarterly Return		(7.69%)
Performance Table Heading		Average Annual Returns
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 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 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 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 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.
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.
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | After Taxes on Distributions | Fidelity Advisor Sustainable International Equity Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			1.15%													(3.20%)	[27]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | After Taxes on Distributions and Sales | Fidelity Advisor Sustainable International Equity Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			1.25%													(2.20%)	[27]
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | IXWRT
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE ESG Leaders
Average Annual Return, Percent			2.25%													1.30%
FidelitySustainableEmergingMarketsEquityFundFidelitySustainableInternationalEquityFund-AMCIZComboPRO | Fidelity Sustainable International Equity Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%													2.50%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund | Fidelity SAI Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.75%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.30%
Expenses (as a percentage of Assets)		1.05%
Fee Waiver or Reimbursement	[33]	(0.10%)
Net Expenses (as a percentage of Assets)		0.95%
Expense Example, with Redemption, 1 Year		$ 97
Expense Example, with Redemption, 3 Years		321
Expense Example, with Redemption, 5 Years		566
Expense Example, with Redemption, 10 Years		$ 1,270
Annual Return, Inception Date		Apr. 14, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.36%													1.05%	[34]
Annual Return [Percent]				5.36%	11.67%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® SAI Sustainable Emerging Markets Equity Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® SAI Sustainable Emerging Markets Equity Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 95 % of the average value of its portfolio.
Portfolio Turnover, Rate		95.00%
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 [Heading]		Principal Investment Strategies
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 that the Adviser identifies as having similar emerging markets 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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		33.20%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		9.27%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(7.49%)
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 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.
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.
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund | After Taxes on Distributions | Fidelity SAI Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			5.02%													0.80%	[34]
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund | After Taxes on Distributions and Sales | Fidelity SAI Sustainable Emerging Markets Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			3.64%													0.88%	[34]
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund | IXWRU
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets (EM) ESG Leaders Index
Average Annual Return, Percent			13.20%													1.13%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable Emerging Markets Equity Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%													1.29%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund | Fidelity SAI Sustainable International Equity Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.65%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.13%
Expenses (as a percentage of Assets)		0.78%
Fee Waiver or Reimbursement	[35]	(0.03%)
Net Expenses (as a percentage of Assets)		0.75%
Expense Example, with Redemption, 1 Year		$ 77
Expense Example, with Redemption, 3 Years		245
Expense Example, with Redemption, 5 Years		429
Expense Example, with Redemption, 10 Years		$ 962
Annual Return, Inception Date		Apr. 14, 2022
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			7.66%													3.20%	[36]
Annual Return [Percent]				7.66%	13.36%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® SAI Sustainable International Equity Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® SAI Sustainable International Equity Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		Feb. 28, 2027
Portfolio Turnover [Heading]		Portfolio Turnover
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 42 % of the average value of its portfolio.
Portfolio Turnover, Rate		42.00%
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 [Heading]		Principal Investment Strategies
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. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		20.00%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Dec. 31, 2023
Highest Quarterly Return		11.48%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Sep. 30, 2023
Lowest Quarterly Return		(7.49%)
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 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.
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.
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund | After Taxes on Distributions | Fidelity SAI Sustainable International Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			7.38%													3.03%	[36]
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund | After Taxes on Distributions and Sales | Fidelity SAI Sustainable International Equity Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.86%													2.52%	[36]
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund | IXWRT
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE ESG Leaders
Average Annual Return, Percent			2.25%													4.35%
FidelitySAISustainableInternationalEquityEmergingMarketsEquityFunds-ComboPRO | Fidelity SAI Sustainable International Equity Fund | MS001
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI EAFE Index
Average Annual Return, Percent			4.07%													5.43%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund | Fidelity Series Sustainable Emerging Markets Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.25%
Expenses (as a percentage of Assets)		0.25%
Fee Waiver or Reimbursement	[37]	(0.24%)
Net Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		54
Expense Example, with Redemption, 10 Years		$ 233
Annual Return, Inception Date		May 11, 2023
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			5.33%											8.44%	[38]
Annual Return [Percent]				5.33%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Sustainable Emerging Markets Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Sustainable Emerging Markets Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		February 28, 2029
Portfolio Turnover [Heading]		Portfolio Turnover
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 87 % of the average value of its portfolio.
Portfolio Turnover, Rate		87.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of issuers in emerging markets, including 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 that the Adviser identifies as having similar emerging markets 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. 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 a quantitative portfolio construction and optimization model to select securities for the fund and capitalize on the Adviser's proprietary and third-party ESG ratings and research. 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. Third-party ESG ratings will be considered in addition to the Adviser's ESG ratings in the quantitative portfolio construction and optimization process. Investing in either "growth" stocks or "value" stocks or both. 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.
Bar Chart and Performance Table [Heading]		Performance
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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		29.59%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Sep. 30, 2024
Highest Quarterly Return		6.60%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(6.47%)
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 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.
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.
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund | After Taxes on Distributions | Fidelity Series Sustainable Emerging Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			4.75%											7.74%	[38]
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund | After Taxes on Distributions and Sales | Fidelity Series Sustainable Emerging Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			3.51%											6.41%	[38]
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund | MC041
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets Index
Average Annual Return, Percent			7.50%											8.71%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Emerging Markets Fund | IXVXH
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI Emerging Markets ESG Focus Index
Average Annual Return, Percent			6.88%											8.49%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund | Fidelity Series Sustainable Non-U.S. Developed Markets Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.00%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.10%
Expenses (as a percentage of Assets)		0.10%
Fee Waiver or Reimbursement	[39]	(0.09%)
Net Expenses (as a percentage of Assets)		0.01%
Expense Example, with Redemption, 1 Year		$ 1
Expense Example, with Redemption, 3 Years		3
Expense Example, with Redemption, 5 Years		24
Expense Example, with Redemption, 10 Years		$ 96
Annual Return, Inception Date		May 11, 2023
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			6.68%											9.13%	[40]
Annual Return [Percent]				6.68%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund: Fidelity® Series Sustainable Non-U.S. Developed Markets Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Series Sustainable Non-U.S. Developed Markets Fund seeks long-term growth of capital.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Fee Waiver or Reimbursement over Assets, Date of Termination		February 28, 2029
Portfolio Turnover [Heading]		Portfolio Turnover
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 39 % of the average value of its portfolio.
Portfolio Turnover, Rate		39.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Normally investing at least 80% of assets in securities of issuers in developed markets, including investments that are tied economically to developed 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. Developed markets include countries, other than the United States, that have a developed stock market as defined by MSCI and other countries or markets with similar developed 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. 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 a quantitative portfolio construction and optimization model to select securities for the fund and capitalize on the Adviser's proprietary and third-party ESG ratings and research. 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. Third-party ESG ratings will be considered in addition to the Adviser's ESG ratings in the quantitative portfolio construction and optimization process. Investing in either "growth" stocks or "value" stocks or both. 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.
Bar Chart and Performance Table [Heading]		Performance
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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information.
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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		23.72%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Mar. 31, 2024
Highest Quarterly Return		7.02%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Dec. 31, 2024
Lowest Quarterly Return		(6.45%)
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 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.
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.
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund | After Taxes on Distributions | Fidelity Series Sustainable Non-U.S. Developed Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			6.21%											8.65%	[40]
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund | After Taxes on Distributions and Sales | Fidelity Series Sustainable Non-U.S. Developed Markets Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			4.40%											7.04%	[40]
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund | IXVXK
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI World ex USA ESG Focus Index
Average Annual Return, Percent			5.08%											6.81%
FidelitySeriesSustainableEmergingMarketsSeriesSustainableNon-USDevelopedMarketsFunds-ComboPRO | Fidelity Series Sustainable Non-U.S. Developed Markets Fund | MC040
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI World ex USA Index
Average Annual Return, Percent			4.95%											7.11%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | Fidelity Advisor Global Commodity Stock Fund - Class A
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		5.75%
Maximum Deferred Sales Charge (as a percentage)	[41]	0.00%
Management Fees (as a percentage of Assets)		0.86%
Distribution and Service (12b-1) Fees		0.25%
Other Expenses (as a percentage of Assets):		0.03%
Expenses (as a percentage of Assets)		1.14%
Expense Example, with Redemption, 1 Year		$ 685
Expense Example, with Redemption, 3 Years		916
Expense Example, with Redemption, 5 Years		1,167
Expense Example, with Redemption, 10 Years		1,881
Expense Example, No Redemption, 1 Year		685
Expense Example, No Redemption, 3 Years		916
Expense Example, No Redemption, 5 Years		1,167
Expense Example, No Redemption, 10 Years		$ 1,881
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			(3.25%)															7.95%							5.18%
Annual Return [Percent]				2.65%	(5.36%)	20.39%	25.73%	5.75%	17.49%	(13.43%)	18.19%	30.10%	(27.69%)
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | Fidelity Advisor Global Commodity Stock Fund - Class M
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		3.50%
Maximum Deferred Sales Charge (as a percentage)	[41]	0.00%
Management Fees (as a percentage of Assets)		0.86%
Distribution and Service (12b-1) Fees		0.50%
Other Expenses (as a percentage of Assets):		0.03%
Expenses (as a percentage of Assets)		1.39%
Expense Example, with Redemption, 1 Year		$ 487
Expense Example, with Redemption, 3 Years		775
Expense Example, with Redemption, 5 Years		1,084
Expense Example, with Redemption, 10 Years		1,960
Expense Example, No Redemption, 1 Year		487
Expense Example, No Redemption, 3 Years		775
Expense Example, No Redemption, 5 Years		1,084
Expense Example, No Redemption, 10 Years		$ 1,960
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			(1.19%)															8.15%							5.13%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | Fidelity Advisor Global Commodity Stock Fund - Class C
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)	[42]	1.00%
Management Fees (as a percentage of Assets)		0.86%
Distribution and Service (12b-1) Fees		1.00%
Other Expenses (as a percentage of Assets):		0.04%
Expenses (as a percentage of Assets)		1.90%
Expenses Deferred Charges [Text Block]		On Class C shares redeemed less than one year after purchase.
Expense Example, with Redemption, 1 Year		$ 293
Expense Example, with Redemption, 3 Years		597
Expense Example, with Redemption, 5 Years		1,026
Expense Example, with Redemption, 10 Years		2,024
Expense Example, No Redemption, 1 Year		193
Expense Example, No Redemption, 3 Years		597
Expense Example, No Redemption, 5 Years		1,026
Expense Example, No Redemption, 10 Years		$ 2,024
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			0.91%															8.43%							5.18%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | Fidelity Advisor Global Commodity Stock Fund - Class I
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)		0.86%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.03%
Expenses (as a percentage of Assets)		0.89%
Expense Example, with Redemption, 1 Year		$ 91
Expense Example, with Redemption, 3 Years		284
Expense Example, with Redemption, 5 Years		493
Expense Example, with Redemption, 10 Years		1,096
Expense Example, No Redemption, 1 Year		91
Expense Example, No Redemption, 3 Years		284
Expense Example, No Redemption, 5 Years		493
Expense Example, No Redemption, 10 Years		$ 1,096
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			2.99%															9.55%							6.14%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | Fidelity Advisor Global Commodity Stock Fund - Class Z
Prospectus Line Items
Maximum Cumulative Sales Charge (as a percentage of Offering Price)		0.00%
Maximum Deferred Sales Charge (as a percentage)		0.00%
Management Fees (as a percentage of Assets)		0.73%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.03%
Expenses (as a percentage of Assets)		0.76%
Expense Example, with Redemption, 1 Year		$ 78
Expense Example, with Redemption, 3 Years		243
Expense Example, with Redemption, 5 Years		422
Expense Example, with Redemption, 10 Years		942
Expense Example, No Redemption, 1 Year		78
Expense Example, No Redemption, 3 Years		243
Expense Example, No Redemption, 5 Years		422
Expense Example, No Redemption, 10 Years		$ 942
Annual Return, Inception Date		Oct. 02, 2018
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			3.12%															9.70%			7.29%	[43]
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund /Class: Fidelity® Global Commodity Stock Fund /Fidelity Advisor® Global Commodity Stock Fund A, M, C, I, Z
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Global Commodity Stock Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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 35 of the prospectus and in the sales charge waiver appendix to the prospectus.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 78 % of the average value of its portfolio.
Portfolio Turnover, Rate		78.00%
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 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 35 of the prospectus
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Investing in securities issued throughout the world. 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. Normally investing primarily in common stocks. Normally investing at least 80% of assets in stocks of commodities companies. Stocks are a type of equity security that represent an ownership interest in an issuer. Stocks include common stocks (including depositary receipts evidencing ownership of common stock) and preferred stocks. Commodities companies are those principally engaged in the energy, metals, and agriculture group of industries.  These companies may include, for example, integrated oil companies; companies engaged in the exploration and production of oil and gas; companies primarily involved in the production and mining of coal, related products, and other consumable fuels; fertilizer and agricultural chemicals companies; producers of aluminum and related products; companies engaged in producing or extracting metals and minerals; producers of gold, precious metals and minerals, and related products; producers of iron and steel; manufacturers of timber and related wood and paper products; and producers of agricultural products, including crop growers, owners of plantations, and companies that produce and process foods. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. 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. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		institutional.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
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.
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.
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		20.19%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Mar. 31, 2022
Highest Quarterly Return		29.99%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(32.53%)
Performance Table Heading		Average Annual Returns
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 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 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 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 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.
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.
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | After Taxes on Distributions | Fidelity Advisor Global Commodity Stock Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			(3.70%)															7.50%							4.77%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | After Taxes on Distributions and Sales | Fidelity Advisor Global Commodity Stock Fund - Class A
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			(1.48%)															6.30%							4.11%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | MS404
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI ACWI (All Country World Index) Commodity Producers Sector Capped Index
Average Annual Return, Percent			(8.80%)															5.72%							4.44%
FidelityGlobalCommodityStockFund-AMCIZPRO | Fidelity Global Commodity Stock Fund | MS159
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI ACWI (All Country World Index) Index
Average Annual Return, Percent			17.87%															10.44%							9.64%
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund | Fidelity Global Commodity Stock Fund
Prospectus Line Items
Management Fees (as a percentage of Assets)		0.82%
Distribution and Service (12b-1) Fees		0.00%
Other Expenses (as a percentage of Assets):		0.03%
Expenses (as a percentage of Assets)		0.85%
Expense Example, with Redemption, 1 Year		$ 87
Expense Example, with Redemption, 3 Years		271
Expense Example, with Redemption, 5 Years		471
Expense Example, with Redemption, 10 Years		$ 1,049
Average Annual Return, Label [Optional Text]			Return Before Taxes
Average Annual Return, Percent			3.00%															9.52%							6.07%
Annual Return [Percent]				3.00%	(5.19%)	20.71%	26.12%	6.00%	17.77%	(13.20%)	18.42%	30.36%	(27.49%)
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund
Prospectus Line Items
Risk/Return [Heading]		Fund Summary Fund /Class: Fidelity® Global Commodity Stock Fund /Fidelity® Global Commodity Stock Fund
Objective [Heading]		Investment Objective
Objective, Primary [Text Block]		Fidelity® Global Commodity Stock Fund seeks capital appreciation.
Expense Heading [Optional Text]		Fee Table
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.
Shareholder Fees Caption [Optional Text]		Shareholder fees
Shareholder Fee, Other		$ 0
Operating Expenses Caption [Optional Text]		Annual Operating Expenses
Portfolio Turnover [Heading]		Portfolio Turnover
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 78 % of the average value of its portfolio.
Portfolio Turnover, Rate		78.00%
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 [Heading]		Principal Investment Strategies
Strategy Narrative [Text Block]		Investing in securities issued throughout the world. 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. Normally investing primarily in common stocks. Normally investing at least 80% of assets in stocks of commodities companies. Stocks are a type of equity security that represent an ownership interest in an issuer. Stocks include common stocks (including depositary receipts evidencing ownership of common stock) and preferred stocks. Commodities companies are those principally engaged in the energy, metals, and agriculture group of industries.  These companies may include, for example, integrated oil companies; companies engaged in the exploration and production of oil and gas; companies primarily involved in the production and mining of coal, related products, and other consumable fuels; fertilizer and agricultural chemicals companies; producers of aluminum and related products; companies engaged in producing or extracting metals and minerals; producers of gold, precious metals and minerals, and related products; producers of iron and steel; manufacturers of timber and related wood and paper products; and producers of agricultural products, including crop growers, owners of plantations, and companies that produce and process foods. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. 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. Allocating investments across different countries and regions. 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.
Bar Chart and Performance Table [Heading]		Performance
Performance Narrative [Text Block]		The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to 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 Information Illustrates Variability of Returns [Text]		The information illustrates the changes in the performance of the fund's shares from year to 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 Availability Website Address [Text]		www.fidelity.com
Performance Past Does Not Indicate Future [Text]		Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]		Year-by-Year Returns
Year to Date Return, Label [Optional Text]		Year-to-Date Return
Bar Chart, Year to Date Return, Date		Sep. 30, 2025
Bar Chart, Year to Date Return		20.45%
Highest Quarterly Return, Label [Optional Text]		Highest Quarter Return
Highest Quarterly Return, Date		Mar. 31, 2022
Highest Quarterly Return		30.11%
Lowest Quarterly Return, Label [Optional Text]		Lowest Quarter Return
Lowest Quarterly Return, Date		Mar. 31, 2020
Lowest Quarterly Return		(32.45%)
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 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.
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.
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund | After Taxes on Distributions | Fidelity Global Commodity Stock Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions
Average Annual Return, Percent			2.43%															9.00%							5.59%
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund | After Taxes on Distributions and Sales | Fidelity Global Commodity Stock Fund
Prospectus Line Items
Average Annual Return, Label [Optional Text]			Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent			2.27%															7.57%							4.83%
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund | MS404
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI ACWI (All Country World Index) Commodity Producers Sector Capped Index
Average Annual Return, Percent			(8.80%)															5.72%							4.44%
FidelityGlobalCommodityStockFund-RetailPRO | Fidelity Global Commodity Stock Fund | MS159
Prospectus Line Items
Average Annual Return, Label [Optional Text]			MSCI ACWI (All Country World Index) Index
Average Annual Return, Percent			17.87%															10.44%							9.64%
Document Type		485BPOS
Registrant Name		Fidelity Investment Trust

[1] A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI Emerging Markets Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.

[2] B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the class of shares of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 1.25% (the Expense Cap). If at any time during the current fiscal year expenses for the class of shares of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[3] A From February 10, 2022 .

[4] A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI EAFE Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.

[5] B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the class of shares of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 1.05% (the Expense Cap). If at any time during the current fiscal year expenses for the class of shares of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[6] A From February 10, 2022 .

[7] A From November 4, 2022 .

[8] A From April 11, 2019 .

[9] A From November 5, 2019 .

[10] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, fees and expenses of the Independent Trustees, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.013% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2029 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[11] A From August 29, 2018 .

[12] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, fees and expenses of the Independent Trustees, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.013% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2029 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[13] A From August 15, 2017 .

[14] A From June 21, 2019 .

[15] A 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.

[16] A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI Emerging Markets Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.

[17] B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class A, Class M, Class C, Class I, and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 1.50%, 1.75%, 2.25%, 1.25%, and 1.10% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, Class C, Class I, or Class Z of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through February 28, 2027 . FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date.

[18] A From February 10, 2022 .

[19] B From February 10, 2022 .

[20] B On Class C shares redeemed less than one year after purchase.

[21] C From February 10, 2022 .

[22] D From February 10, 2022 .

[23] E From February 10, 2022 .

[24] A 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.

[25] A The management fee comprises a basic fee, which may vary by class, that is adjusted up or down by a maximum of 0.10% based on the performance of the fund or a designated class of the fund relative to that of the MSCI EAFE Index. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.

[26] B Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class A, Class M, Class C, Class I, and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 1.30%, 1.55%, 2.05%, 1.05%, and 0.90% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, Class C, Class I, or Class Z of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through February 28, 2027 . FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date.

[27] A From February 10, 2022 .

[28] B From February 10, 2022 .

[29] B On Class C shares redeemed less than one year after purchase.

[30] C From February 10, 2022 .

[31] D From February 10, 2022 .

[32] E From February 10, 2022 .

[33] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.95% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[34] A From April 14, 2022 .

[35] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.75% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2027 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[36] A From April 14, 2022 .

[37] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, fees and expenses of the Independent Trustees, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.013% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2029 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[38] A From May 11, 2023 .

[39] A Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, fees and expenses of the Independent Trustees, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.013% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through February 28, 2029 . FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

[40] A From May 11, 2023 .

[41] A 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.

[42] B On Class C shares redeemed less than one year after purchase.

[43] A From October 2, 2018 .