3.25.1 html 81 89 1 true 47 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.natixis.com/role/DocumentDocumentandEntityInformationElements000000 Document and Entity Information Risk/Return 1 false false R2.htm 000021 - Disclosure - Risk/Return Detail Data {Elements} - Loomis Sayles Global Growth Fund Sheet http://www.natixis.com/role/DisclosureRiskReturnDetailDataElementsLoomisSaylesGlobalGrowthFund000021 Risk/Return Detail Data- Loomis Sayles Global Growth Fund Risk/Return 2 false false R3.htm 000041 - Disclosure - Risk/Return Detail Data {Elements} - Loomis Sayles Senior Floating Rate and Fixed Income Fund Sheet http://www.natixis.com/role/DisclosureRiskReturnDetailDataElementsLoomisSaylesSeniorFloatingRateandFixedIncomeFund000041 Risk/Return Detail Data- Loomis Sayles Senior Floating Rate and Fixed Income Fund Risk/Return 3 false false R4.htm 000061 - Disclosure - Risk/Return Detail Data {Elements} - Vaughan Nelson Select Fund Sheet http://www.natixis.com/role/DisclosureRiskReturnDetailDataElementsVaughanNelsonSelectFund000061 Risk/Return Detail Data- Vaughan Nelson Select Fund Risk/Return 4 false false All Reports Book All Reports d919690d485bpos.htm nftii-20250328.xsd nftii-20250328_cal.xml nftii-20250328_def.xml nftii-20250328_lab.xml nftii-20250328_pre.xml g919690g89f52.jpg g919690pr4638img001.jpg g919690pr4638img002.jpg g919690pr4638img003.jpg g919690pr4638img004.jpg g919690pr4638img005.jpg http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/rr/2023 true true