Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Dec. 30, 2014
Retail | Fidelity Emerging Markets Discovery Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fit_SupplementTextBlock	Supplement to the Fidelity® Emerging Markets Discovery Fund and Fidelity Total Emerging Markets Fund December 30, 2014 Prospectus Effective October 1, 2015, Fidelity® Emerging Markets Discovery Fund changed its classification from a non-diversified fund to a diversified fund.