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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Dec. 30, 2016
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity® Emerging Markets Discovery Fund/Fidelity Advisor® Emerging Markets Discovery Fund A, T, C, I
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

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 29 of the prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2017
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

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 60% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 29 of the prospectus.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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 your shareholder 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:

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

Sell All Shares
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in securities of issuers in emerging markets (countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets with similar emerging characteristics) and other investments that are tied economically to emerging markets.
  • Normally investing primarily in common stocks.
  • Investing in either "growth" stocks or "value" stocks or both.
  • Allocating the fund's assets across emerging markets sectors, using different Fidelity managers.
  • Allocating investments across different emerging market 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.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.
  • Foreign and Emerging Market Risk. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
  • Mid Cap Investing. The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
  • Small Cap Investing. The value of securities of smaller, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

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 institutional.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information is intended to help you understand the risks of investing in the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress Visit institutional.fidelity.com for more recent performance information.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock

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] rr_BarChartDoesNotReflectSalesLoads 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 Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart for Class A:ReturnsQuarter ended
Highest Quarter Return18.56%March 31, 2012
Lowest Quarter Return-13.07%September 30, 2015
Year-to-Date Return17.10%September 30, 2016
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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 rr_PerformanceTableNotRelevantToTaxDeferred 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] rr_PerformanceTableOneClassOfAfterTaxShown 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 rr_PerformanceTableExplanationAfterTaxHigher 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 rr_PerformanceTableNarrativeTextBlock

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.

For the periods ended December 31, 2015
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Fidelity Emerging Markets Discovery Fund-Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 90 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.79%
Total annual operating expenses rr_ExpensesOverAssets 1.89%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.70%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 738
3 years rr_ExpenseExampleYear03 1,114
5 years rr_ExpenseExampleYear05 1,518
10 years rr_ExpenseExampleYear10 2,642
1 Year rr_ExpenseExampleNoRedemptionYear01 738
3 Years rr_ExpenseExampleNoRedemptionYear03 1,114
5 Years rr_ExpenseExampleNoRedemptionYear05 1,518
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,642
2012 rr_AnnualReturn2012 35.06%
2013 rr_AnnualReturn2013 0.14%
2014 rr_AnnualReturn2014 (4.53%)
2015 rr_AnnualReturn2015 (9.21%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 17.10%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.07%)
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Fidelity Emerging Markets Discovery Fund-Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 90 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.82%
Total annual operating expenses rr_ExpensesOverAssets 2.17%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.22% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.95%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 541
3 years rr_ExpenseExampleYear03 981
5 years rr_ExpenseExampleYear05 1,451
10 years rr_ExpenseExampleYear10 2,746
1 Year rr_ExpenseExampleNoRedemptionYear01 541
3 Years rr_ExpenseExampleNoRedemptionYear03 981
5 Years rr_ExpenseExampleNoRedemptionYear05 1,451
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,746
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Fidelity Emerging Markets Discovery Fund-Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Redemption fee on shares held less than 90 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.78%
Total annual operating expenses rr_ExpensesOverAssets 2.63%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.18% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 2.45%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 $ 348
3 years rr_ExpenseExampleYear03 797
5 years rr_ExpenseExampleYear05 1,376
10 years rr_ExpenseExampleYear10 2,948
1 Year rr_ExpenseExampleNoRedemptionYear01 248
3 Years rr_ExpenseExampleNoRedemptionYear03 797
5 Years rr_ExpenseExampleNoRedemptionYear05 1,376
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,948
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Fidelity Emerging Markets Discovery Fund - Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee on shares held less than 90 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.74%
Total annual operating expenses rr_ExpensesOverAssets 1.59%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.14% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.45%
1 year rr_ExpenseExampleYear01 $ 148
3 years rr_ExpenseExampleYear03 486
5 years rr_ExpenseExampleYear05 850
10 years rr_ExpenseExampleYear10 1,875
1 Year rr_ExpenseExampleNoRedemptionYear01 148
3 Years rr_ExpenseExampleNoRedemptionYear03 486
5 Years rr_ExpenseExampleNoRedemptionYear05 850
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,875
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Return Before Taxes | Fidelity Emerging Markets Discovery Fund-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (14.43%)
Since Inception rr_AverageAnnualReturnSinceInception 1.01% [4]
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Return Before Taxes | Fidelity Emerging Markets Discovery Fund-Class T  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Class T - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (12.59%)
Since Inception rr_AverageAnnualReturnSinceInception 1.34% [4]
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Return Before Taxes | Fidelity Emerging Markets Discovery Fund-Class C  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (10.80%)
Since Inception rr_AverageAnnualReturnSinceInception 1.71% [4]
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | Return Before Taxes | Fidelity Emerging Markets Discovery Fund - Class I  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Class I - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (8.95%)
Since Inception rr_AverageAnnualReturnSinceInception 2.74% [4]
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | After Taxes on Distributions | Fidelity Emerging Markets Discovery Fund-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (14.27%)
Since Inception rr_AverageAnnualReturnSinceInception 0.82% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | After Taxes on Distributions and Sales | Fidelity Emerging Markets Discovery Fund-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity® Emerging Markets Discovery Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 (7.81%)
Since Inception rr_AverageAnnualReturnSinceInception 0.92% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2011
10.31 Fidelity Emerging Markets Discovery Fund - ATCI PRO-02 | Fidelity® Emerging Markets Discovery Fund | MSCI Emerging Markets SMID Cap Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (9.85%)
Since Inception rr_AverageAnnualReturnSinceInception 0.20% [4]
[1] Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
[2] Fidelity Management & Research Company (FMR) has contractually agreed to reimburse Class A, Class T, Class C, and Class I of the fund to the extent that total operating expenses (excluding interest, certain taxes, certain securities lending costs, brokerage commissions, extraordinary expenses, and acquired fund fees and expenses, if any), as a percentage of their respective average net assets, exceed 1.70%, 1.95%, 2.45%, and 1.45% respectively. These arrangements will remain in effect through December 31, 2017. FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees.
[3] On Class C shares redeemed less than one year after purchase.
[4] From November 1, 2011