000100 - Disclosure - Risk/Return Detail Data Supplement {Elements} - (Natixis Funds Trust I) link:presentationLink link:calculationLink link:definitionLink 001002 - Schedule - Shareholder Fees - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001003 - Schedule - Annual Fund Operating Expenses - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001004 - Schedule - Expense Example {Transposed} - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001005 - Schedule - Expense Example, No Redemption {Transposed} - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001006 - Schedule - Annual Total Returns - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001007 - Schedule - Average Annual Total Returns {Transposed} - {Natixis Oakmark Global Fund} link:presentationLink link:calculationLink link:definitionLink 001102 - Schedule - Shareholder Fees - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 001103 - Schedule - Annual Fund Operating Expenses - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 001104 - Schedule - Expense Example {Transposed} - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 001105 - Schedule - Expense Example, No Redemption {Transposed} - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 001106 - Schedule - Annual Total Returns - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 001107 - Schedule - Average Annual Total Returns {Transposed} - {Natixis Oakmark International Fund} link:presentationLink link:calculationLink link:definitionLink 000001 - Document - Document and Entity Information {Elements} link:presentationLink link:calculationLink link:definitionLink 000099 - Document - Risk/Return Supplement {Unlabeled} - (Natixis Funds Trust I) link:presentationLink link:calculationLink link:definitionLink