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| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 25355 |
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| IRS990/ActivityCd | 0 | 611600 |
| IRS990/ActivityOrMissionDesc | 0 | Galloway is the philosophically grounded, learner-focused independent school where students age 3 through grade 12 develop an abiding love for learning. |
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| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 213059 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 666836 |
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| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | GA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 303423223 |
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| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 6770253 |
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| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 299967 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 25 | 40.0 |
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| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
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| 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/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | RUTH PARKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | ROB RUMLEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | CHRISTY THOMAS |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | SUZANNA JEMSBY |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | POLLY WILLIAMS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | SARAH ARMSTRONG |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 25 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE-CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
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| 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 | ALUMNI COUNCIL PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | PARENTS' ASSOCIATION PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | CFO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | DIRECTOR OF TECHNOLOGY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | PRINCIPAL - UL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | DIRECTOR OF DEVELOPMENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | PRINCIPAL - EL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | PRINCIPAL - ML |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1969 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/OtherAmt | 0 | -259529 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -441145 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 20 |
| IRS990/GrantAmt | 0 | 1625870 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1625870 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 1625870 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | true |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | true |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 17900374 |
| IRS990/GrossReceiptsAmt | 0 | 39168288 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 19 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 7 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InfoInScheduleOPartXInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 10959 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 310603 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 321562 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 7156 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 138876 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 146032 |
| IRS990/IntangibleAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/IntangibleAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 80137 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 3416 |
| IRS990/InterestGrp/TotalAmt | 0 | 83553 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 0 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 572153 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 573805 |
| IRS990/InvestmentIncomeGrp/UnrelatedBusinessRevenueAmt | 0 | 1652 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 587191 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 569324 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/EOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 17510059 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 17885740 |
| IRS990/InvestTaxExemptBondsInd | 0 | false |
| IRS990/IRPDocumentCnt | 0 | 55 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 12698176 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 21533974 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 24707565 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 37405741 |
| IRS990/LegalDomicileStateCd | 0 | GA |
| IRS990/LessCostOthBasisSalesExpnssGrp/OtherAmt | 0 | 259529 |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 18341519 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | GALLOWAY IS THE PHILOSOPHICALLY GROUNDED, LEARNER-FOCUSED INDEPENDENT SCHOOL WHERE STUDENTS AGE 3 THROUGH GRADE 12 DEVELOP AN ABIDING LOVE FOR LEARNING. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |