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