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| IRS990/ActivityOrMissionDesc | 0 | Dedicated to improving the lives of persons and their families living with serious mental illness. |
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| IRS990/Desc | 0 | Public Awareness, Partnerships and Outreach: NAMI is leading the way toward a new understanding of mental illness and the urgent need for integrated care and support that empowers people to live their best lives. Our work supports the recovery, dignity and well-being of individuals and families nationwide.714,400 SOCIAL MEDIA FOLLOWERSNAMI's social media following grew more than 30% as campaigns such as #WhyCare reached new audiences nationwide with a powerful call to end the stigma surrounding mental illness. See Schedule O for additional Public Awareness, Partnerships and Outreach highlights in 2019 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | Director through 6/30/19 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | Director through 6/30/19 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | CEO through 4/22/19 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Chief Financial Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | Acting Chief Executive Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | Chief Operating Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | Chief Development Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | Director, Legislative Affairs |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | National Director, Education |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | Nat'l Dir., Strategic Partnerships |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | Nat'l Dir., Marketing/Communications |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1979 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -3664 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 16 |
| IRS990/GrantAmt | 0 | 147790 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 342905 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 342905 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 2245490 |
| IRS990/GrossReceiptsAmt | 0 | 21952659 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 418529 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 16 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 18 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 13475 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 377523 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 322097 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 713095 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 39 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 117139 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 218891 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 288233 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 288233 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 10401272 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 12498000 |
| IRS990/IRPDocumentCnt | 0 | 51 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 1839781 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1647890 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1449954 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 3289735 |
| IRS990/LegalDomicileStateCd | 0 | MO |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 2249154 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 1 |
| IRS990/LocalChaptersInd | 0 | 1 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembershipDuesAmt | 0 | 314918 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | NAMI, the National Alliance on Mental Illness, is the nation's largest grassroots mental health organization dedicated to building better lives for the millions of Americans affected by mental illness. See Schedule O for full Mission. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 14740320 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 17447609 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | -3664 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -3664 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 144400 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 144400 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 1276688 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 7859001 |