| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 543740 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 253157 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 243689 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 128098 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | THE FRANK LLOYD WRIGHT FOUNDATION INSPIRES PEOPLE TO DISCOVER AND EMBRACE AN ARCHITECTURE FOR BETTER LIVING THROUGH MEANINGFUL CONNECTIONS TO NATURE, THE ARTS, AND EACH OTHER. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 25978 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 455 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 201221 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 227654 |
| IRS990/AllOtherContributionsAmt | 0 | 3654034 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 38128 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 5319 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 256425 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 299872 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | JOY HANSON |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6028005441 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 12621 N FRANK LLOYD WRIGHT BLVD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | SCOTTSDALE |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | AZ |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 85259 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 170674 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 51999 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 1 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 55236 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 15782 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 323527 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 394545 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CostOfGoodsSoldAmt | 0 | 626510 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 3654034 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 369292 |
| IRS990/CYOtherExpensesAmt | 0 | 3287645 |
| IRS990/CYOtherRevenueAmt | 0 | 769451 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 3766668 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 989924 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 4165876 |
| IRS990/CYTotalExpensesAmt | 0 | 7569521 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 996577 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 116000 |
| IRS990/CYTotalRevenueAmt | 0 | 8559445 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 77092 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 65890 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 18227 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 28601 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 668804 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 715632 |
| IRS990/Desc | 0 | BUILDING PRESERVATION - THE FRANK LLOYD WRIGHT FOUNDATION INVESTS CAPITAL AND CONSIDERABLE EFFORTS IN ORDER TO PROTECT, MAINTAIN, AND RESTORE THE ARCHITECTURALLY HISTORIC STRUCTURES AND SPACES THAT COMPRISE ITS CAMPUSES IN BOTH SCOTTSDALE, ARIZONA, AND SPRING GREEN, WISCONSIN. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1722406 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 3804616 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 140 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 2011080 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 22500 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 22500 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 110081 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 32970 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 412155 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 555206 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 116000 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 116000 |
| IRS990/ForeignActivitiesInd | 0 | 1 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 7643 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 10707 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 16124 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 9954 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 6664 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 7068 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | TK MCCLINTOCK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | MAJA WESSELS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | JOEL BENKIE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | TIMOTHY RADDEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | SEAN RUSH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | MARK DREHER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | CHRISTOPHER THOMPSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | HEATHER LENKIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ROBERT SKERKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | ANNE STUPP |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | MICHAEL DESMOND |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | DIANA SMITH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | CATHERINE LENHART |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | STUART GRAFF |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | JOY HANSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | FREDERICK PROZILLO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | STEPHANIE PIEROTTI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | AMY FLYNN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | SUSAN WHITMER |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 263023 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 151428 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 125600 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 119050 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 115503 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 102616 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CHAIR (THROUGH 8/1/19) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | CEO & PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | VP OF FINANCE & COO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | VP OF PRESERVATION |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | VP OF LICENSING |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | DIRECTOR OF I.T. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | DIRECTOR OF FINANCE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/Form990TFiledInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1965 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 291542 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GrantAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 1700370 |
| IRS990/GrossReceiptsAmt | 0 | 10594783 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 34208 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 1347236 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 43025 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 15508 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 132892 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 191425 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 16473 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 27378 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 140019 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 183870 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 38191 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 38191 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 3497 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 2095 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 25129 |
| IRS990/InterestGrp/TotalAmt | 0 | 30721 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 209604 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 281506 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 77750 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 77750 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2139710 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 3728335 |
| IRS990/IRPDocumentCnt | 0 | 65 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 10204724 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 10086475 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 9577793 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 19782517 |
| IRS990/LegalDomicileStateCd | 0 | AZ |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 1408828 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE FRANK LLOYD WRIGHT FOUNDATION INSPIRES PEOPLE TO DISCOVER AND EMBRACE AN ARCHITECTURE FOR BETTER LIVING THROUGH MEANINGFUL CONNECTIONS TO NATURE, THE ARTS, AND EACH OTHER. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 580187 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 1733619 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 16097769 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 16916180 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 291542 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 291542 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 471251 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 720726 |
| IRS990/NetIncomeOrLossGrp/UnrelatedBusinessRevenueAmt | 0 | 249475 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 34208 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 34208 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 20177 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -171513 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 14375363 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 13111564 |
| IRS990/NoncashContributionsAmt | 0 | 2035853 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 6373 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 3958 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 492202 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 502533 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 16194 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 2151 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 93924 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 112269 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 2859567 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 2887067 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 32104 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 8830 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 259676 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 300610 |
| IRS990/OtherExpensesGrp/Desc | 0 | RESERVATION EXPENSE |
| IRS990/OtherExpensesGrp/Desc | 1 | SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 2 | PROGRAM EXPENSES |
| IRS990/OtherExpensesGrp/Desc | 3 | DUES AND SUBSCRIPTIONS |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 4238 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 3036 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 5018 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 1435 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 1474 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 1841 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 211303 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 92484 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 59876 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 18021 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 211303 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 98157 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 64386 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 24880 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 531390 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | GUEST HOUSING |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 14517 |
| IRS990/OtherRevenueMiscGrp/UnrelatedBusinessRevenueAmt | 0 | 14517 |
| IRS990/OtherRevenueTotalAmt | 0 | 14517 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 461472 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 123962 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 2609170 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 3194604 |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 36934 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 10538 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 213999 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 261471 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 1104 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 1910 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 11632 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 14646 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 903173 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 330785 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 154105 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 119895 |
| IRS990/PrincipalOfficerNm | 0 | STUART GRAFF |
| IRS990/ProfessionalFundraisingInd | 0 | 1 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 561520 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | PUBLIC TOURS & ACCESS |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | LICENSING PROGRAM |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | EDUCATIONAL OUTREACH |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | ANNUAL ACCESS FEE |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2770819 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 799131 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 146718 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 50000 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 2770819 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 799131 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 146718 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 50000 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | PUBLIC TOURS AND ACCESS PROGRAM - THE FRANK LLOYD WRIGHT FOUNDATION OFFERS TOURS AND EDUCATIONAL OUTREACH PROGRAMS TO INCREASE PUBLIC AWARENESS OF THE WORK OF FRANK LLOYD WRIGHT AND THE FIELD OF ARCHITECTURE. ABOUT 73,000 INDIVIDUALS VISITED THE HISTORIC SCOTTSDALE, ARIZONA, LANDMARK DURING THE FISCAL YEAR ENDED JULY 31, 2020. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 1537447 |
| IRS990/ProgSrvcAccomActy2Grp/GrantAmt | 0 | 0 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 2770819 |