Risk/Return: Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Document Creation Date Document Effective Date Prospectus Date Supplement BlockItemType Supplement [Text Block] Natixis funds trust i [Abstract] Prospectus: Document [Axis] Prospectus Class AC Class Ac Member Class AC Series [Axis] Series S000030605 Member Natixis Oakmark Global Fund S000030606 Member Natixis Oakmark International Fund