Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 30, 2014
I | Fidelity Emerging Markets Discovery Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fit_SupplementTextBlock	Supplement to the Fidelity Advisor® Emerging Markets Discovery Fund Institutional Class December 30, 2014 Prospectus Effective July 1, 2015, Institutional Class will be renamed Class I. The features and policies of the class will not change. Effective October 1, 2015, the fund changed its classification from a non-diversified fund to a diversified fund.