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| <xs:element id="gbdc3_IndustryConcentrationRiskMember" abstract="true" name="IndustryConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DiversifiedConsumerServicesSectorMember" abstract="true" name="DiversifiedConsumerServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NoncashIncreaseDecreaseInCapitalCallsReceivable" abstract="false" name="NoncashIncreaseDecreaseInCapitalCallsReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ClassA20222LoansMember" abstract="true" name="ClassA20222LoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeExpenseCapitalGain" abstract="false" name="IncentiveFeeExpenseCapitalGain" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeScenarioDomain" abstract="true" name="IncentiveFeeScenarioDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LongTermDebtAverageAmountOutstandingPerShare" abstract="false" name="LongTermDebtAverageAmountOutstandingPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="gbdc3_DistributorsSectorMember" abstract="true" name="DistributorsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ScheduleOfSummarizedDividendReinvestmentPlanInformationTableTextBlock" abstract="false" name="ScheduleOfSummarizedDividendReinvestmentPlanInformationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_InterestIncomeOperatingAccretionOfDiscounts" abstract="false" name="InterestIncomeOperatingAccretionOfDiscounts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_SecuritizationIssuerOnAssetCoverageTestConflictRiskMember" abstract="true" name="SecuritizationIssuerOnAssetCoverageTestConflictRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioPerUnit" abstract="false" name="InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioPerUnit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="gbdc3_RestrictionsOnAbilityOfHoldersOfCommonStockToTransferSharesRiskMember" abstract="true" name="RestrictionsOnAbilityOfHoldersOfCommonStockToTransferSharesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_MachinerySectorMember" abstract="true" name="MachinerySectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyOtherRealizedGainLossDifferences" abstract="false" name="InvestmentCompanyOtherRealizedGainLossDifferences" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_EquitySecuritiesDistributionRiskMember" abstract="true" name="EquitySecuritiesDistributionRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AdvisorsActInARiskierMannerRiskMember" abstract="true" name="AdvisorsActInARiskierMannerRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_RepurchaseAgreementRiskMember" abstract="true" name="RepurchaseAgreementRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HealthcareProvidersAndServicesSectorMember" abstract="true" name="HealthcareProvidersAndServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdministratorMember" abstract="true" name="InvestmentAdministratorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssuancesSettlementsOfUndrawnPortionOfRevolvingLoans" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssuancesSettlementsOfUndrawnPortionOfRevolvingLoans" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DataBreachRiskMember" abstract="true" name="DataBreachRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LineOfCreditFacilityAggregateCommitmentsEachDayPercentage" abstract="false" name="LineOfCreditFacilityAggregateCommitmentsEachDayPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_RelatedPartyTransactionAgreementToPurchaseSubscriptionCommitment" abstract="false" name="RelatedPartyTransactionAgreementToPurchaseSubscriptionCommitment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_OperationOfPortfolioCompanyUponDefaultRiskMember" abstract="true" name="OperationOfPortfolioCompanyUponDefaultRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementCapitalGainIncentiveFeeMember" abstract="true" name="InvestmentAdvisoryAgreementCapitalGainIncentiveFeeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_SeekingTheMostAdvantageousTermsForAnInvestmentRiskMember" abstract="true" name="SeekingTheMostAdvantageousTermsForAnInvestmentRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ScheduleOfAccumulatedEarningsDeficitBookBasisIncomeTaxTableTextBlock" abstract="false" name="ScheduleOfAccumulatedEarningsDeficitBookBasisIncomeTaxTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_SoftwareSectorMember" abstract="true" name="SoftwareSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_RealEstateManagementAndDevelopmentSectorMember" abstract="true" name="RealEstateManagementAndDevelopmentSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InterestAndFeeIncomeOperatingPaidInCash" abstract="false" name="InterestAndFeeIncomeOperatingPaidInCash" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_Subordinated2021NotesMember" abstract="true" name="Subordinated2021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HealthcareTechnologySectorMember" abstract="true" name="HealthcareTechnologySectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AutomobilesSectorMember" abstract="true" name="AutomobilesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementCumulativePreIncentiveFeeNetInvestmentIncomeMember" abstract="true" name="InvestmentAdvisoryAgreementCumulativePreIncentiveFeeNetInvestmentIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InternetAndCatalogRetailSectorMember" abstract="true" name="InternetAndCatalogRetailSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LitigationOrRegulatoryInvestigationsRiskMember" abstract="true" name="LitigationOrRegulatoryInvestigationsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyContractualFeeWaivedIncentiveFeeIncomeBased" abstract="false" name="InvestmentCompanyContractualFeeWaivedIncentiveFeeIncomeBased" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_PharmaceuticalsSectorMember" abstract="true" name="PharmaceuticalsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DividendsAndDistributionsTextBlock" abstract="false" name="DividendsAndDistributionsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_A20222DebtSecuritizationMember" abstract="true" name="A20222DebtSecuritizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PeriodsEndingAfterTheDateOfTheClosingOfTheLiquidityEventMember" abstract="true" name="PeriodsEndingAfterTheDateOfTheClosingOfTheLiquidityEventMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PerCommonShareDataAbstract" abstract="true" name="PerCommonShareDataAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_SecuritizationIssuersInterestRiskMember" abstract="true" name="SecuritizationIssuersInterestRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LenderLiabilityClaimsRiskMember" abstract="true" name="LenderLiabilityClaimsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CompetitiveMarketRiskMember" abstract="true" name="CompetitiveMarketRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_PubliclyOfferedRegulatedInvestmentCompanyRiskMember" abstract="true" name="PubliclyOfferedRegulatedInvestmentCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ValuationYieldAnalysisMember" abstract="true" name="ValuationYieldAnalysisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyUncalledCapitalCommitments" abstract="false" name="InvestmentCompanyUncalledCapitalCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtAndEquitySecuritiesUnrealizedGainLossMember" abstract="true" name="DebtAndEquitySecuritiesUnrealizedGainLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PriceDeclinesAndIlliquidityInTheCorporateDebtMarketsRiskMember" abstract="true" name="PriceDeclinesAndIlliquidityInTheCorporateDebtMarketsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InterestIncomeOperatingPaidInKindCapitalized" abstract="false" name="InterestIncomeOperatingPaidInKindCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_HealthcareEquipmentAndSuppliesSectorMember" abstract="true" name="HealthcareEquipmentAndSuppliesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AdverseTaxConsequencesRiskMember" abstract="true" name="AdverseTaxConsequencesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ClassC22021NotesMember" abstract="true" name="ClassC22021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CapitalMarketsDisruptionAndEconomicUncertaintyRiskMember" abstract="true" name="CapitalMarketsDisruptionAndEconomicUncertaintyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_RealEstateManagementDevelopmentSectorMember" abstract="true" name="RealEstateManagementDevelopmentSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_SecuritiesPurchasedByAdvisorRiskMember" abstract="true" name="SecuritiesPurchasedByAdvisorRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_OtherShortTermBorrowingsMember" abstract="true" name="OtherShortTermBorrowingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CommercialServicesSuppliesSectorMember" abstract="true" name="CommercialServicesSuppliesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PreventionFromReceivingCashFromSecuritizationIssuersRiskMember" abstract="true" name="PreventionFromReceivingCashFromSecuritizationIssuersRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BusinessLinesConflictRiskMember" abstract="true" name="BusinessLinesConflictRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_IncreaseDecreaseInDepositDerivativeContract" abstract="false" name="IncreaseDecreaseInDepositDerivativeContract" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtSecuritiesSubordinatedDebtAndSecondLienLoanMember" abstract="true" name="DebtSecuritiesSubordinatedDebtAndSecondLienLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DiversifiedFinancialServicesSectorMember" abstract="true" name="DiversifiedFinancialServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NonUSCompanyRiskMember" abstract="true" name="NonUSCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DividendIncomeOperatingNonCash" abstract="false" name="DividendIncomeOperatingNonCash" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyIncentiveFeeWaiverToAverageNetAssets" abstract="false" name="InvestmentCompanyIncentiveFeeWaiverToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_ProfessionalServicesSectorMember" abstract="true" name="ProfessionalServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_SpecialtyRetailSectorMember" abstract="true" name="SpecialtyRetailSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AdministrationAgreementMember" abstract="true" name="AdministrationAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentManagementAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" abstract="true" name="InvestmentManagementAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PrepayLoansRiskMember" abstract="true" name="PrepayLoansRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_OwnershipInterestRiskMember" abstract="true" name="OwnershipInterestRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DifficultySourcingInvestmentOpportunityRiskMember" abstract="true" name="DifficultySourcingInvestmentOpportunityRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ScheduleOfTaxCharacterOfDistributionsPaidTableTextBlock" abstract="false" name="ScheduleOfTaxCharacterOfDistributionsPaidTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_LimitationOnTheAbilityToSellInvestmentsHeldByFundingSubsidiariesRiskMember" abstract="true" name="LimitationOnTheAbilityToSellInvestmentsHeldByFundingSubsidiariesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BeveragesSectorMember" abstract="true" name="BeveragesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DistributeAssetsInKindRiskMember" abstract="true" name="DistributeAssetsInKindRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_IssuanceOfStockSubscriptionAgreementsMinimumNoticePeriod" abstract="false" name="IssuanceOfStockSubscriptionAgreementsMinimumNoticePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyContractualFeeWaivedManagementFee" abstract="false" name="InvestmentCompanyContractualFeeWaivedManagementFee" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_TextilesApparelLuxuryGoodsSectorMember" abstract="true" name="TextilesApparelLuxuryGoodsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_UnrealizedGainOnInvestment" abstract="false" name="UnrealizedGainOnInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyGainLossOnUnrealizedAppreciationDepreciationPerShare" abstract="false" name="InvestmentCompanyGainLossOnUnrealizedAppreciationDepreciationPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/> |
| <xs:element id="gbdc3_PoliticalUncertaintyRiskMember" abstract="true" name="PoliticalUncertaintyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HedgingTransactionsRiskMember" abstract="true" name="HedgingTransactionsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_IncreaseDecreaseInAccruedTrusteeFees" abstract="false" name="IncreaseDecreaseInAccruedTrusteeFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_LimitationOverAbilityToInvestInPublicCompaniesRiskMember" abstract="true" name="LimitationOverAbilityToInvestInPublicCompaniesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtInvestmentRiskMember" abstract="true" name="DebtInvestmentRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AssetConcentrationRiskMember" abstract="true" name="AssetConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_MediaSectorMember" abstract="true" name="MediaSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ManagementAndServiceFeesIncentiveRateCapPercentageOfCumulativePreIncentiveFeeNetIncome" abstract="false" name="ManagementAndServiceFeesIncentiveRateCapPercentageOfCumulativePreIncentiveFeeNetIncome" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="gbdc3_Subordinated2022NotesMember" abstract="true" name="Subordinated2022NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtAndEquitySecuritiesRealizedGainLossMember" abstract="true" name="DebtAndEquitySecuritiesRealizedGainLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_UnrealizedLossOnInvestment" abstract="false" name="UnrealizedLossOnInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_EmergingGrowthCompanyRiskMember" abstract="true" name="EmergingGrowthCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_DividendsDeclaredAbstract" abstract="true" name="DividendsDeclaredAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetNonCashDividends" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetNonCashDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtSecuritizationTypeDomain" abstract="true" name="DebtSecuritizationTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LineOfCreditFacilityNonUsageFeePercentage" abstract="false" name="LineOfCreditFacilityNonUsageFeePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_SecuritizationIssuersIssuingAdditionalNotesRiskMember" abstract="true" name="SecuritizationIssuersIssuingAdditionalNotesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HealthCareProvidersServicesSectorMember" abstract="true" name="HealthCareProvidersServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_QualifyAsARICConflictRiskMember" abstract="true" name="QualifyAsARICConflictRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InterestIncomeOperatingMember" abstract="true" name="InterestIncomeOperatingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyEscrowDepositsRelatedToIncentiveFeePeriodIncreaseDecrease" abstract="false" name="InvestmentCompanyEscrowDepositsRelatedToIncentiveFeePeriodIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_NonSeniorLoanFundMember" abstract="true" name="NonSeniorLoanFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ManagementAndIncentiveFeesForAdvisorsRiskMember" abstract="true" name="ManagementAndIncentiveFeesForAdvisorsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyTaxableIncomeBeforeDeductionsForDistributions" abstract="false" name="InvestmentCompanyTaxableIncomeBeforeDeductionsForDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyTotalExpensesToAverageNetAssets" abstract="false" name="InvestmentCompanyTotalExpensesToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_A2021DebtSecuritizationMember" abstract="true" name="A2021DebtSecuritizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ClassB2021NotesMember" abstract="true" name="ClassB2021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AAAClassASeniorSecuredFloatingRateLoansMaturing2034Member" abstract="true" name="AAAClassASeniorSecuredFloatingRateLoansMaturing2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtInstrumentCreditSpreadAdjustment" abstract="false" name="DebtInstrumentCreditSpreadAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_InvestmentOwnedAndMoneyMarketFundsPercentOfNetAssets" abstract="false" name="InvestmentOwnedAndMoneyMarketFundsPercentOfNetAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_QualifyingAssetTypeDomain" abstract="true" name="QualifyingAssetTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ConflictOfInterestWithAdvisorMember" abstract="true" name="ConflictOfInterestWithAdvisorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_MarineSectorMember" abstract="true" name="MarineSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementIncomeIncentiveFeeMember" abstract="true" name="InvestmentAdvisoryAgreementIncomeIncentiveFeeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_RaisingAdditionalCapitalExposureRiskMember" abstract="true" name="RaisingAdditionalCapitalExposureRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences" abstract="false" name="InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentDiscretionRiskMember" abstract="true" name="InvestmentDiscretionRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeExpenseCapitalGainWaived" abstract="false" name="IncentiveFeeExpenseCapitalGainWaived" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ProceedsFromDerivativeInstrumentOperatingActivities" abstract="false" name="ProceedsFromDerivativeInstrumentOperatingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ValuationMarketComparableCompanyMember" abstract="true" name="ValuationMarketComparableCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AutoComponentsSectorMember" abstract="true" name="AutoComponentsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ExciseTaxExpenseReductionNet" abstract="false" name="ExciseTaxExpenseReductionNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtSecuritiesSeniorSecuredLoanMember" abstract="true" name="DebtSecuritiesSeniorSecuredLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_SignificantCostRiskMember" abstract="true" name="SignificantCostRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_FoodAndStaplesRetailingSectorMember" abstract="true" name="FoodAndStaplesRetailingSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtSecuritiesOneStopLoanMember" abstract="true" name="DebtSecuritiesOneStopLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BiotechnologySectorMember" abstract="true" name="BiotechnologySectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PrivateAndMiddleMarketPortfolioCompanyRiskMember" abstract="true" name="PrivateAndMiddleMarketPortfolioCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyContributedCapitalToSubscribedCapitalRatio" abstract="false" name="InvestmentCompanyContributedCapitalToSubscribedCapitalRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="gbdc3_DistributionsToStockholdersAbstract" abstract="true" name="DistributionsToStockholdersAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_ChangesInInterestRatesRiskMember" abstract="true" name="ChangesInInterestRatesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_TradingCompaniesAndDistributorsSectorMember" abstract="true" name="TradingCompaniesAndDistributorsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ForeignCurrencyTransactionGainLossRealizedMember" abstract="true" name="ForeignCurrencyTransactionGainLossRealizedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyEscrowDepositsReturnedRelatedToIncentiveFee" abstract="false" name="InvestmentCompanyEscrowDepositsReturnedRelatedToIncentiveFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_EconomicRecessionsOrDownturnsRiskMember" abstract="true" name="EconomicRecessionsOrDownturnsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ClassA2021NotesMember" abstract="true" name="ClassA2021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_OilGasAndConsumableFuelsSectorMember" abstract="true" name="OilGasAndConsumableFuelsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DependentUponAdvisorsRiskMember" abstract="true" name="DependentUponAdvisorsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ScheduleOfReclassificationTaxableIncomeTableTextBlock" abstract="false" name="ScheduleOfReclassificationTaxableIncomeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_ElectronicEquipmentInstrumentsAndComponentsSectorMember" abstract="true" name="ElectronicEquipmentInstrumentsAndComponentsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_LineOfCreditFacilityPrepaymentFeeSecondYearAfterEffectiveDatePercentage" abstract="false" name="LineOfCreditFacilityPrepaymentFeeSecondYearAfterEffectiveDatePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_RestrictedCashHeldInForeignCurrencyAcquisitionCost" abstract="false" name="RestrictedCashHeldInForeignCurrencyAcquisitionCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ConflictOfInterestBetweenAdvisorsObligationRiskMember" abstract="true" name="ConflictOfInterestBetweenAdvisorsObligationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_LifeSciencesToolsServicesSectorMember" abstract="true" name="LifeSciencesToolsServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtGrossMaturity3Through5Years" abstract="false" name="DebtGrossMaturity3Through5Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DiversifiedTelecommunicationServicesSectorMember" abstract="true" name="DiversifiedTelecommunicationServicesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_StrategicTransactionsConflictRiskMember" abstract="true" name="StrategicTransactionsConflictRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_CreditFacilityRiskMember" abstract="true" name="CreditFacilityRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_USMidAtlanticMember" abstract="true" name="USMidAtlanticMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DGCLAndCertificateOfIncorporationRiskMember" abstract="true" name="DGCLAndCertificateOfIncorporationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_FluctuationInQuarterlyOperationResultsRiskMember" abstract="true" name="FluctuationInQuarterlyOperationResultsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NoPublicMarketForSharesOfOurCommonStockRiskMember" abstract="true" name="NoPublicMarketForSharesOfOurCommonStockRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_WaterUtilitiesSectorMember" abstract="true" name="WaterUtilitiesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_MoneyMarketFundsPercentOfNetAssets" abstract="false" name="MoneyMarketFundsPercentOfNetAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_PotentialForAdvisorsAndItsAffiliatesToReceivedEconomicBenefitRiskMember" abstract="true" name="PotentialForAdvisorsAndItsAffiliatesToReceivedEconomicBenefitRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ChangeInDistributionCostsIncurredButNotYetPaid" abstract="false" name="ChangeInDistributionCostsIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_LineOfCreditFacilityPrepaymentFeeFirstYearAfterEffectiveDatePercentage" abstract="false" name="LineOfCreditFacilityPrepaymentFeeFirstYearAfterEffectiveDatePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_DebtGrossMaturityLessThan1Year" abstract="false" name="DebtGrossMaturityLessThan1Year" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_UndrawnRevolverMember" abstract="true" name="UndrawnRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_SarbanesOxleyActComplianceRiskMember" abstract="true" name="SarbanesOxleyActComplianceRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_EffectOfLeverageRiskMember" abstract="true" name="EffectOfLeverageRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DBCreditFacilityMember" abstract="true" name="DBCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AdvisorsResignOn60DaysNoticeRiskMember" abstract="true" name="AdvisorsResignOn60DaysNoticeRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_RestrictedCashHeldInForeignCurrency" abstract="false" name="RestrictedCashHeldInForeignCurrency" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_FailureToMakeFollowOnInvestmentRiskMember" abstract="true" name="FailureToMakeFollowOnInvestmentRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AdviserRevolverMember" abstract="true" name="AdviserRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InternetCatalogRetailSectorMember" abstract="true" name="InternetCatalogRetailSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ReductionOfCapitalInvestInAssetsRiskMember" abstract="true" name="ReductionOfCapitalInvestInAssetsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AccruedTrusteeFees" abstract="false" name="AccruedTrusteeFees" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_AdjustmentsToReconcileNetIncreaseDecreaseInNetAssetsResultingFromOperationsToNetCashProvidedByUsedInOperatingActivitiesAbstract" abstract="true" name="AdjustmentsToReconcileNetIncreaseDecreaseInNetAssetsResultingFromOperationsToNetCashProvidedByUsedInOperatingActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyOtherIncomeForTaxButNotBook" abstract="false" name="InvestmentCompanyOtherIncomeForTaxButNotBook" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_RoadRailSectorMember" abstract="true" name="RoadRailSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AerospaceAndDefenseSectorMember" abstract="true" name="AerospaceAndDefenseSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtGrossMaturity1Through3Years" abstract="false" name="DebtGrossMaturity1Through3Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_AdjustmentToDistributableEarningsLoss" abstract="false" name="AdjustmentToDistributableEarningsLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaidInKindInterest" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaidInKindInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_AdverseDevelopmentInCreditMarketRiskMember" abstract="true" name="AdverseDevelopmentInCreditMarketRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtGrossMaturityMoreThan5Years" abstract="false" name="DebtGrossMaturityMoreThan5Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_HouseholdProductsSectorMember" abstract="true" name="HouseholdProductsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AAAClassASeniorSecuredFloatingRateNotesDue2034Member" abstract="true" name="AAAClassASeniorSecuredFloatingRateNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HealthCareEquipmentSuppliesSectorMember" abstract="true" name="HealthCareEquipmentSuppliesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BankruptcyOnDebtSecuritiesRiskMember" abstract="true" name="BankruptcyOnDebtSecuritiesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ScheduleOfDebtSecuritizationTableTextBlock" abstract="false" name="ScheduleOfDebtSecuritizationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_NonHoldingControllingEquityInterestRiskMember" abstract="true" name="NonHoldingControllingEquityInterestRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NonCashDividendsCapitalized" abstract="false" name="NonCashDividendsCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_AClassC22021NotesMember" abstract="true" name="AClassC22021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HotelsRestaurantsLeisureSectorMember" abstract="true" name="HotelsRestaurantsLeisureSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_HouseholdDurablesSectorMember" abstract="true" name="HouseholdDurablesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ClassASeniorSecuredFloatingRateNotesMember" abstract="true" name="ClassASeniorSecuredFloatingRateNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DiscontinuationOfLIBORRiskMember" abstract="true" name="DiscontinuationOfLIBORRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ScopeOfInvestmentAvailabilityLimitationRiskMember" abstract="true" name="ScopeOfInvestmentAvailabilityLimitationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_LackOfAvailableInformationOnPrivatelyHeldCompanyRiskMember" abstract="true" name="LackOfAvailableInformationOnPrivatelyHeldCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AbilityToManageBusinessAndToGrowRiskMember" abstract="true" name="AbilityToManageBusinessAndToGrowRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_AdverseDevelopmentsInFinancialServicesIndustryRiskMember" abstract="true" name="AdverseDevelopmentsInFinancialServicesIndustryRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_HotelsRestaurantsAndLeisureSectorMember" abstract="true" name="HotelsRestaurantsAndLeisureSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AClassC12021NotesMember" abstract="true" name="AClassC12021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NonQualifyingAssetMember" abstract="true" name="NonQualifyingAssetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CapitalCallReceivable" abstract="false" name="CapitalCallReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ObligationOfAdvisorsAndConflictRelatedToFeesAndExpenseRiskMember" abstract="true" name="ObligationOfAdvisorsAndConflictRelatedToFeesAndExpenseRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_GovernmentInterventionInCreditMarketsRiskMember" abstract="true" name="GovernmentInterventionInCreditMarketsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ExpensesPaidMember" abstract="true" name="ExpensesPaidMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyNetExpensesToAverageNetAssets" abstract="false" name="InvestmentCompanyNetExpensesToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_DividendIncomeOperatingPaidInKindAndNonCash" abstract="false" name="DividendIncomeOperatingPaidInKindAndNonCash" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_NumberOfInvestmentPortfolioCompany" abstract="false" name="NumberOfInvestmentPortfolioCompany" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/> |
| <xs:element id="gbdc3_RoadAndRailSectorMember" abstract="true" name="RoadAndRailSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_PeriodsEndingOnOrPriorToTheDateOfTheClosingOfTheLiquidityEventMember" abstract="true" name="PeriodsEndingOnOrPriorToTheDateOfTheClosingOfTheLiquidityEventMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyExpenseRatioBeforeIncentiveFees" abstract="false" name="InvestmentCompanyExpenseRatioBeforeIncentiveFees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_ContingentLiabilitiesRiskMember" abstract="true" name="ContingentLiabilitiesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CommercialServicesAndSuppliesSectorMember" abstract="true" name="CommercialServicesAndSuppliesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DifficultyPayingRequiredDistributionsRiskMember" abstract="true" name="DifficultyPayingRequiredDistributionsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyOtherIncomeLossNotCurrentlyTaxable" abstract="false" name="InvestmentCompanyOtherIncomeLossNotCurrentlyTaxable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyPremiumPrepaymentFees" abstract="false" name="InvestmentCompanyPremiumPrepaymentFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_AirlinesSectorMember" abstract="true" name="AirlinesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ProceedsFromPurchasesForUndrawnPortionOfRevolvingLoansOperatingActivities" abstract="false" name="ProceedsFromPurchasesForUndrawnPortionOfRevolvingLoansOperatingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_NoAssuranceOverReplicateHistoricalResultsRiskMember" abstract="true" name="NoAssuranceOverReplicateHistoricalResultsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_ReturnOfCapitalMember" abstract="true" name="ReturnOfCapitalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentOwnedAtFairValueAndMoneyMarketFundsAtCarryingValue" abstract="false" name="InvestmentOwnedAtFairValueAndMoneyMarketFundsAtCarryingValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtObligationRiskMember" abstract="true" name="DebtObligationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BuildingProductsSectorMember" abstract="true" name="BuildingProductsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementMember" abstract="true" name="InvestmentAdvisoryAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeExpenseIncomeBased" abstract="false" name="IncentiveFeeExpenseIncomeBased" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DebtSecuritizationRiskMember" abstract="true" name="DebtSecuritizationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_NetIncreaseDecreaseInNetAssetsResultingFromOperationsAbstract" abstract="true" name="NetIncreaseDecreaseInNetAssetsResultingFromOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_RelatedPartyTransactionAgreementToPurchaseCommonStockShare" abstract="false" name="RelatedPartyTransactionAgreementToPurchaseCommonStockShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/> |
| <xs:element id="gbdc3_ClassC12021NotesMember" abstract="true" name="ClassC12021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeScenarioAxis" abstract="true" name="IncentiveFeeScenarioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_ShortTermApplicableFederalRateMember" abstract="true" name="ShortTermApplicableFederalRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ConflictRelatedToOtherArrangementWithAdvisorsRiskMember" abstract="true" name="ConflictRelatedToOtherArrangementWithAdvisorsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_AAClassBSeniorSecuredFloatingRateNotesDue2034Member" abstract="true" name="AAClassBSeniorSecuredFloatingRateNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementSubordinatedLiquidationIncentiveFeeBaseMember" abstract="true" name="InvestmentAdvisoryAgreementSubordinatedLiquidationIncentiveFeeBaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_TaxTreatmentOfANonUSStockholdersJurisdictionRiskMember" abstract="true" name="TaxTreatmentOfANonUSStockholdersJurisdictionRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyDistributionsDeclaredAndPayable" abstract="false" name="InvestmentCompanyDistributionsDeclaredAndPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_PreventionFromReceivingCashFromFundingSubsidiaryRiskMember" abstract="true" name="PreventionFromReceivingCashFromFundingSubsidiaryRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyPerShareDataAbstract" abstract="true" name="InvestmentCompanyPerShareDataAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_A2022DebtSecuritizationMember" abstract="true" name="A2022DebtSecuritizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_FacilityFees" abstract="false" name="FacilityFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestorsFailureToFundCapitalCommitmentsRiskMember" abstract="true" name="InvestorsFailureToFundCapitalCommitmentsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_SBRevolverMember" abstract="true" name="SBRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_EquityInvestmentLossRiskMember" abstract="true" name="EquityInvestmentLossRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DerivativeAverageNotionalAmount" abstract="false" name="DerivativeAverageNotionalAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ElectronicEquipmentInstrumentsComponentsSectorMember" abstract="true" name="ElectronicEquipmentInstrumentsComponentsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyLiquidityEventManagementAndServiceFeesBaseRateWaiverThresholdPercentageOfFairValueOfAverageAdjustedGrossAssets" abstract="false" name="InvestmentCompanyLiquidityEventManagementAndServiceFeesBaseRateWaiverThresholdPercentageOfFairValueOfAverageAdjustedGrossAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/> |
| <xs:element id="gbdc3_DebtInstrumentDefaultsRiskMember" abstract="true" name="DebtInstrumentDefaultsRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AAAClassA2021NotesMember" abstract="true" name="AAAClassA2021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_FoodStaplesRetailingSectorMember" abstract="true" name="FoodStaplesRetailingSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_MarketVolatilityRiskMember" abstract="true" name="MarketVolatilityRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_CommunicationsEquipmentSectorMember" abstract="true" name="CommunicationsEquipmentSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_GCOPLLCMember" abstract="true" name="GCOPLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyDistributionToShareholdersThresholdNetAssetValuePerShare" abstract="false" name="InvestmentCompanyDistributionToShareholdersThresholdNetAssetValuePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/> |
| <xs:element id="gbdc3_NetAssetValueOfCommonStockVolatilityRiskMember" abstract="true" name="NetAssetValueOfCommonStockVolatilityRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_PaperForestProductsSectorMember" abstract="true" name="PaperForestProductsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_IncentiveFeeExpenseNetOfAdjustments" abstract="false" name="IncentiveFeeExpenseNetOfAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_DependentOnAdvisorsToMaintainOrDevelopStrongReferralRelationshipRiskMember" abstract="true" name="DependentOnAdvisorsToMaintainOrDevelopStrongReferralRelationshipRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTaxes" abstract="false" name="UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_ClassA20222NotesMember" abstract="true" name="ClassA20222NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_AssumingLiabilitiesOfSecuritizationIssuerRiskMember" abstract="true" name="AssumingLiabilitiesOfSecuritizationIssuerRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtSecuritizationTypeAxis" abstract="true" name="DebtSecuritizationTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyContributedCapital" abstract="false" name="InvestmentCompanyContributedCapital" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_HoldingCompanyRisksMember" abstract="true" name="HoldingCompanyRisksMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_LiquidityEventRiskMember" abstract="true" name="LiquidityEventRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyManagementFeeWaiverToAverageNetAssets" abstract="false" name="InvestmentCompanyManagementFeeWaiverToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_UncertaintyOnValueOfThePortfolioInvestmentRiskMember" abstract="true" name="UncertaintyOnValueOfThePortfolioInvestmentRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_BBBClassD2021NotesMember" abstract="true" name="BBBClassD2021NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_MeasurementInputMarketInterestRateMember" abstract="true" name="MeasurementInputMarketInterestRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InflationRiskMember" abstract="true" name="InflationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_GEMSFund4LPMember" abstract="true" name="GEMSFund4LPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyExciseTaxToAverageNetAssets" abstract="false" name="InvestmentCompanyExciseTaxToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/> |
| <xs:element id="gbdc3_InvestmentAdvisoryAgreementCapitalGainIncentiveFeeUnderGAAPMember" abstract="true" name="InvestmentAdvisoryAgreementCapitalGainIncentiveFeeUnderGAAPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_DebtSecuritiesSecondLienMember" abstract="true" name="DebtSecuritiesSecondLienMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyExpensesNotCurrentlyDeductible" abstract="false" name="InvestmentCompanyExpensesNotCurrentlyDeductible" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_InvestmentCompanyDividendDistributionFromDistributableEarningsLosses" abstract="false" name="InvestmentCompanyDividendDistributionFromDistributableEarningsLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_CapitalGainMember" abstract="true" name="CapitalGainMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_InvestmentInLeveragedPortfolioCompanyRiskMember" abstract="true" name="InvestmentInLeveragedPortfolioCompanyRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ChangesInOperatingAssetsAndLiabilitiesAbstract" abstract="true" name="ChangesInOperatingAssetsAndLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="gbdc3_LeisureProductsSectorMember" abstract="true" name="LeisureProductsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| <xs:element id="gbdc3_ReconciliationOfTaxableIncomeIncreaseDecreaseInNetAssetsFromOperationTableTextBlock" abstract="false" name="ReconciliationOfTaxableIncomeIncreaseDecreaseInNetAssetsFromOperationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/> |
| <xs:element id="gbdc3_TaxCutsAndJobsActReclassificationFromAPICToRetainedEarningsTaxEffect" abstract="false" name="TaxCutsAndJobsActReclassificationFromAPICToRetainedEarningsTaxEffect" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="gbdc3_OilGasConsumableFuelsSectorMember" abstract="true" name="OilGasConsumableFuelsSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| </xs:schema> |