Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 31, 2016
Registrant Name	dei_EntityRegistrantName	FIDELITY INVESTMENT TRUST
Central Index Key	dei_EntityCentralIndexKey	0000744822
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jun. 01, 2017
Document Effective Date	dei_DocumentEffectiveDate	Jun. 01, 2017
Prospectus Date	rr_ProspectusDate	Dec. 30, 2016