| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 276040 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 1104088 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 15358 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 33854 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | MARVELWOOD IS A BOARDING SCHOOL PROVIDING COLLEGE-PREPARATORY EDUCATION TO APPROX. 130 STUDENTS. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 44473 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 44473 |
| IRS990/AllOtherContributionsAmt | 0 | 477054 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 31609 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 82250 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 67929 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 181788 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | THE ORGANIZATION |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8609275316 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 476 SKIFF MT RD PO BOX 3001 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | KENT |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CT |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 067573001 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 132617 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 356362 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 488979 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 375550 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 175839 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 169790 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 400 MAIN STREET |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 40 SOUTH END PLAZA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 93 LAKE AVENUE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | STAMFORD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | NEW MILFORD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | DANBURY |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | CT |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | CT |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | CT |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 06901 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 06776 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 06810 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | MARSH & WOODS ARCHITECTS |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | PREFERRED MAINTENANCE LLC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | KOHLER RONAN LLC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | ARCHETECT |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | HOUSEKEEPING |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | ENGINEERING |
| IRS990/CostOfGoodsSoldAmt | 0 | 18228 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 480878 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 1424112 |
| IRS990/CYInvestmentIncomeAmt | 0 | 149479 |
| IRS990/CYOtherExpensesAmt | 0 | 4148218 |
| IRS990/CYOtherRevenueAmt | 0 | 175561 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 8210970 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -740414 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 4184972 |
| IRS990/CYTotalExpensesAmt | 0 | 9757302 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 598017 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 9016888 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 3788803 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 3127844 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 11915 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 31447 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 554029 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 597391 |
| IRS990/Desc | 0 | MARVELWOOD PROVIDES SECONDARY SCHOOL EDUCATION TO APPROXIMATELY 130, PRIMARILY BOARDING, STUDENTS. NONACADEMIC PROGRAMS INCLUDE WEEKLY COMMUNITY SERVICE, VISUAL AND PERFORMING ARTS ELECTIVES AND INTERSCHOLASTIC AND NONCOMPETITIVE SPORTS. THE SCHOOL PROVIDES A STRUCTURED, SUPPORTIVE AND CHALLENGING ENVIRONMENT FOR COLLEGE PREPARATORY EDUCATION. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 84 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/EscrowAccountInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 7549364 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 29000 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 29000 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 13354 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 13354 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 300 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 46758 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 25542 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 72600 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 24597 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 24597 |
| IRS990/ForeignActivitiesInd | 0 | 1 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | 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/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/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 | 41629 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 29712 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 35060 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | TIMOTHY K CARPENTER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | MARK ESPOSITO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | FRANK MOORE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | ELLEN MCALLISTER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | WILLIAM W DENNETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | PETER TACY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | PATRICK G DUFFY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ROBERT H BAYNE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | PETER B SOMMERFIELD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | RICHARD L HODDESON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ARTHUR GOODEARL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | RICHARD BECKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | PAUL TINES |
| 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 | 192017 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 129808 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 122132 |
| 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/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR, DEVELOPMENT CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER, FINANCE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | ADMISSIONS COMMITTEE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | HEAD OF SCHOOL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CHIEF FINANCIAL OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | ASST HEAD OF SCHOOL ADVANCEMENT |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 0 |
| IRS990/Form990TFiledInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1956 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 500 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 41242 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GovernmentGrantsAmt | 0 | 3824 |
| IRS990/GrantAmt | 0 | 1424112 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1424112 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 1424112 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 500 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 1512785 |
| IRS990/GrossReceiptsAmt | 0 | 10506659 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 21968 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 10 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 12013 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 23533 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 63503 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 99049 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 871 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 2177 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 197737 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 200785 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 19 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 48 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 899 |
| IRS990/InterestGrp/TotalAmt | 0 | 966 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 12814 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 8755 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 107737 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 107737 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 3075573 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2452801 |
| IRS990/InvestTaxExemptBondsInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 53 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 7340442 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 10131336 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 10885801 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 18226243 |
| IRS990/LegalDomicileStateCd | 0 | CT |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 0 |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 1471543 |
| 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/MiscellaneousRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 576 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 576 |
| IRS990/MissionDesc | 0 | MARVELWOOD'S MISSION IS TO PROVIDE THE PATH THAT LEADS TOPERSONAL GROWTH AND ACADEMIC SUCCESS FOR YOUNG PEOPLEWILLING TO GET INVOLVED IN THEIR OWN EDUCATION ANDCOMMITTED TO THE CHALLENGE OF PREPARING FOR COLLEGE.THE SCHOOL IS AN OPTIMISTIC PLACE THAT PROVIDES A STRUCTURED,SUPPORTIVE AND CHALLENGING ENVIRONMENT, CELEBRATES DIVERSITY,AND AWAKENS UNTAPPED POTENTIAL. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 4504432 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 6229281 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 8218297 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 7536439 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 41242 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | 500 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 41742 |
| IRS990/NetIncomeOrLossGrp/ExclusionAmt | 0 | 3740 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 3740 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | -9794 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 121550 |
| IRS990/NoncashContributionsAmt | 0 | 28055 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 27484 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 68711 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 1278024 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 1374219 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 24400 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 72285 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 34326 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 131011 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OnBehalfOfIssuerInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 461624 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 436076 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | -62994 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 31809 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 81204 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 260316 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 373329 |
| IRS990/OtherExpensesGrp/Desc | 0 | FOOD & KITCHEN SERVICES |
| IRS990/OtherExpensesGrp/Desc | 1 | STUDENT ACTIVITIES |
| IRS990/OtherExpensesGrp/Desc | 2 | TEACHING MATERIALS |
| IRS990/OtherExpensesGrp/Desc | 3 | BAD DEBT EXPENSE |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 13842 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 34606 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 643665 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 257732 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 170997 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 68069 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 692113 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 257732 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 170997 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 68069 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 206252 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 212941 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 721000 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 1 | 900099 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 2 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | FACILITY RENTAL |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | INSURANCE REBATE |
| IRS990/OtherRevenueMiscGrp/Desc | 2 | OTHER INCOME |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 12369 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 1 | 9518 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 149358 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | 12369 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 2 | 9518 |
| IRS990/OtherRevenueMiscGrp/UnrelatedBusinessRevenueAmt | 0 | 149358 |
| IRS990/OtherRevenueTotalAmt | 0 | 171821 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 238104 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 554134 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 2203290 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 2995528 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 25905 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 57367 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 175889 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 259161 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 7044 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 15567 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 45364 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 67975 |
| IRS990/PermanentlyRstrNetAssetsGrp/BOYAmt | 0 | 1184467 |
| IRS990/PermanentlyRstrNetAssetsGrp/EOYAmt | 0 | 1190543 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 519737 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 187521 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 91885 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 53986 |
| IRS990/PrincipalOfficerNm | 0 | ARTHUR F GOODEARL JR |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | TUITION & FEES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 8210970 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 8210970 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 642136 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 1267746 |
| IRS990/PYInvestmentIncomeAmt | 0 | 94636 |
| IRS990/PYOtherExpensesAmt | 0 | 4394241 |
| IRS990/PYOtherRevenueAmt | 0 | 218379 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 8321169 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -666252 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 4280585 |
| IRS990/PYTotalExpensesAmt | 0 | 9942572 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 9276320 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -740414 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 0 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 1 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 8233933 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 2685497 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 4151799 |
| IRS990ScheduleA/SchoolInd | 0 | X |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/BoardDesignatedBalanceEOYPct | 0 | 0.31750 |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 7577725 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 5568970 |