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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Dec. 30, 2016
10.31 Fidelity Series International Funds F Combo PRO-04 | Fidelity® Series Emerging Markets Fund  
Risk/Return: rr_RiskReturnAbstract  
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, 2020
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Adjusted to reflect current fees.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

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10.31 Fidelity Series International Funds F Combo PRO-04 | Fidelity® Series Emerging Markets Fund | Fidelity Series Emerging Markets Fund-Class F Fidelity  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets none
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.06% [1]
Total annual operating expenses rr_ExpensesOverAssets 0.06%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.05% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.01%
1 year rr_ExpenseExampleYear01 $ 1
3 years rr_ExpenseExampleYear03 3
5 years rr_ExpenseExampleYear05 14
10 years rr_ExpenseExampleYear10 $ 58
[1] Adjusted to reflect current fees.
[2] The Adviser has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, certain securities lending costs, brokerage commissions, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses, if any), as a percentage of its average net assets, exceed 0.014%. This arrangement will remain in effect through December 31, 2020. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees.