0001143513September 302024Q1false00011435132023-10-012023-12-310001143513us-gaap:CommonStockMember2023-10-012023-12-310001143513glad:A775NotesDue2028Member2023-10-012023-12-3100011435132024-02-02xbrli:shares0001143513us-gaap:InvestmentUnaffiliatedIssuerMember2023-12-31iso4217:USD0001143513us-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513us-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-3000011435132023-12-3100011435132023-09-300001143513glad:TheAdviserMemberus-gaap:RelatedPartyMember2023-12-310001143513glad:TheAdviserMemberus-gaap:RelatedPartyMember2023-09-300001143513us-gaap:RelatedPartyMemberglad:TheAdministratorMember2023-12-310001143513us-gaap:RelatedPartyMemberglad:TheAdministratorMember2023-09-30iso4217:USDxbrli:shares0001143513us-gaap:InvestmentUnaffiliatedIssuerMember2023-10-012023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMember2022-10-012022-12-310001143513us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-10-012023-12-310001143513us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-10-012022-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMember2023-10-012023-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMember2022-10-012022-12-310001143513us-gaap:CashAndCashEquivalentsMember2023-10-012023-12-310001143513us-gaap:CashAndCashEquivalentsMember2022-10-012022-12-3100011435132022-10-012022-12-310001143513us-gaap:OtherInvestmentCompaniesMember2023-10-012023-12-310001143513us-gaap:OtherInvestmentCompaniesMember2022-10-012022-12-3100011435132022-09-3000011435132022-12-310001143513glad:InvestmentUnaffiliatedAndAffiliatedIssuerExcludingOtherMember2023-10-012023-12-310001143513glad:InvestmentUnaffiliatedAndAffiliatedIssuerExcludingOtherMember2022-10-012022-12-310001143513glad:TheAdviserMember2023-10-012023-12-310001143513glad:TheAdviserMember2022-10-012022-12-310001143513glad:TheAdministratorMember2023-10-012023-12-310001143513glad:TheAdministratorMember2022-10-012022-12-310001143513glad:TargusCaymanHoldCoLtdMember2022-10-012022-10-300001143513glad:BRileyFinancialIncTermDebtMember2022-10-31xbrli:pure0001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:AerospaceAndDefenseMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Antenna Research Associates, Inc. – Term Debt2023-12-310001143513Ohio Armor Holdings, LLC – Term Debt2023-12-310001143513SpaceCo Holdings, LLC – Line of Credit2023-12-310001143513SpaceCo Holdings, LLC – Term Deb2023-12-310001143513glad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Café Zupas – Line of Credit,2023-12-310001143513Café Zupas – Delayed Draw Term Loan2023-12-310001143513Café Zupas – Term Debt2023-12-310001143513Eegee’s LLC – Line of Credit2023-12-310001143513Eegee’s LLC – Delayed Draw Term Loan2023-12-310001143513Eegee’s LLC – Term Debt 2023-12-310001143513Salt & Straw, LLC – Line of Credit2023-12-310001143513Salt & Straw, LLC – Delayed Draw Term Loan2023-12-310001143513Sokol & Company Holdings, LLC – Term Debt2023-12-310001143513glad:BuildingsAndRealEstateMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513GFRC 360, LLC – Line of Credit2023-12-310001143513GFRC 360, LLC – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Engineering Manufacturing Technologies, LLC – Line of Credit2023-12-310001143513Engineering Manufacturing Technologies, LLC – Term Debt2023-12-310001143513NeoGraf Solutions LLC – Line of Credit2023-12-310001143513NeoGraf Solutions LLC – Term Debt2023-12-310001143513OCI, LLC – Term Debt2023-12-310001143513Salvo Technologies, Inc. – Term Debt2023-12-310001143513Unirac Holdings, Inc. – Line of Credit2023-12-310001143513Unirac Holdings, Inc. – Delayed Draw Term Loan2023-12-310001143513Unirac Holdings, Inc. – Term Debt 2023-12-310001143513Viva Railings, LLC – Line of Credit2023-12-310001143513Viva Railings, LLC – Term Debt 2023-12-310001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Axios Industrial Group, LLC – Term Debt2023-12-310001143513DKI Ventures, LLC – Line of Credit2023-12-310001143513DKI Ventures, LLC – Term Debt2023-12-310001143513ENET Holdings, LLC – Term Debt2023-12-310001143513Fix-It Group, LLC – Line of Credit2023-12-310001143513Fix-It Group, LLC – Term Debt2023-12-310001143513Fix-It Group, LLC – Delayed Draw Term Loan2023-12-310001143513Leadpoint Business Services, LLC – Term Debt2023-12-310001143513MCG Energy Solutions, LLC – Term Debt2023-12-310001143513Quality Environmental Midco, Inc. – Line of Credit2023-12-310001143513Quality Environmental Midco, Inc. – Term Debt2023-12-310001143513Trowbridge Chicago, LLC – Line of Credit2023-12-310001143513Trowbridge Chicago, LLC – Term Debt 12023-12-310001143513Trowbridge Chicago, LLC – Term Debt 22023-12-310001143513WorkforceQA, LLC– Line of Credit2023-12-310001143513WorkforceQA, LLC – Term Debt 12023-12-310001143513WorkforceQA, LLC – Term Debt 22023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:HealthcareEducationAndChildcareMember2023-12-310001143513ALS Education, LLC – Line of Credit2023-12-310001143513ALS Education, LLC – Term Debt2023-12-310001143513HH-Inspire Acquisition, Inc. – Line of Credit2023-12-310001143513HH-Inspire Acquisition, Inc. – Term Debt 12023-12-310001143513HH-Inspire Acquisition, Inc. – Term Debt 22023-12-310001143513Pansophic Learning, Ltd. – Term Debt 12023-12-310001143513Pansophic Learning, Ltd. – Term Debt 22023-12-310001143513Technical Resource Management, LLC – Line of Credit2023-12-310001143513Technical Resource Management, LLC – Term Debt2023-12-310001143513Technical Resource Management, LLC – Delayed Draw Term Loan2023-12-310001143513Turn Key Health Clinics, LLC – Line of Credit2023-12-310001143513Turn Key Health Clinics, LLC – Term Debt2023-12-310001143513glad:MachineryMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Arc Drilling Holdings LLC – Line of Credit2023-12-310001143513Arc Drilling Holdings LLC – Term Debt 2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:OilAndGasIndustryMember2023-12-310001143513FES Resources Holdings LLC – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:TelecommunicationsMember2023-12-310001143513B+T Group Acquisition, Inc. – Line of Credit2023-12-310001143513B+T Group Acquisition, Inc. – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513glad:AutomobileMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513Sea Link International IRB, Inc. – Term Debt 12023-12-310001143513Sea Link International IRB, Inc. – Term Debt 22023-12-310001143513glad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-3100011435138th Avenue Food & Provisions, Inc. – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513OCI, LLC – Term Debt 22023-12-310001143513Springfield, Inc. – Term Debt2023-12-310001143513Tailwind Smith Cooper Intermediate Corporation – Term Debt2023-12-310001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513CHA Holdings, Inc. – Term Debt 2023-12-310001143513Gray Matter Systems, LLC – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:HealthcareEducationAndChildcareMember2023-12-310001143513Giving Home Health Care, LLC – Term Debt2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:OilAndGasIndustryMember2023-12-310001143513Imperative Holdings Corporation – Term Debt 2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-12-310001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-12-310001143513Frontier Financial Group Inc. – Convertible Debt2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513glad:AutomobileMemberglad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Sea Link International IRB, Inc. – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberglad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Salt & Straw, LLC – Preferred Equity2023-12-310001143513Triple H Food Processors, LLC – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberglad:BuildingsAndRealEstateMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513GFRC 360, LLC – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMember2023-12-310001143513Salvo Technologies, Inc. – Preferred Stock2023-12-310001143513glad:DiversifiedConglomerateServicesMemberglad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Frontier Financial Group Inc. – Preferred Stock2023-12-310001143513Frontier Financial Group Inc. – Preferred Stock Warrant2023-12-310001143513MCG Energy Solutions, LLC – Preferred Stock2023-12-310001143513Quality Environmental Midco, Inc. – Preferred Equity2023-12-310001143513Trowbridge Chicago, LLC – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:HealthcareEducationAndChildcareMember2023-12-310001143513HH-Inspire Acquisition, Inc. – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:OilAndGasIndustryMember2023-12-310001143513FES Resources Holdings LLC – Preferred Equity Units2023-12-310001143513Imperative Holdings Corporation – Preferred Equity Units2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:TelecommunicationsMember2023-12-310001143513B+T Group Acquisition, Inc.(S) – Preferred Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:AerospaceAndDefenseMember2023-12-310001143513 Antenna Research Associates, Inc. – Common Equity Units2023-12-310001143513 Ohio Armor Holdings, LLC – Common Equity2023-12-310001143513glad:AutomobileMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Sea Link International IRB, Inc.– Common Equity Units2023-12-310001143513glad:CommonEquityEquivalentsMemberglad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Salt & Straw, LLC – Common Warrant2023-12-310001143513Sokol & Company Holdings, LLC – Common Stock2023-12-310001143513Triple H Food Processors, LLC – Common Stock2023-12-310001143513glad:BuildingsAndRealEstateMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513GFRC 360, LLC – Common Stock Warrants2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMember2023-12-310001143513 Engineering Manufacturing Technologies, LLC – Common Stock2023-12-310001143513OCI, LLC – Common Units2023-12-310001143513NeoGraf Solutions LLC – Common Stock2023-12-310001143513glad:DiversifiedConglomerateServicesMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513WorkforceQA, LLC – Common Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:HealthcareEducationAndChildcareMember2023-12-310001143513Giving Home Health Care, LLC – Warrant2023-12-310001143513GSM MidCo LLC – Common Stock2023-12-310001143513 Leeds Novamark Capital I, L.P. – Limited Partnership Interest2023-12-310001143513Technical Resource Management, LLC – Common Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberglad:MachineryMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Arc Drilling Holdings LLC – Common Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:OilAndGasIndustryMember2023-12-310001143513FES Resources Holdings LLC – Common Equity Units2023-12-310001143513Total Safety Holdings, LLC – Common Equity2023-12-310001143513glad:CommonEquityEquivalentsMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513Funko Acquisition Holdings, LLC(S) – Common Units2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:TelecommunicationsMember2023-12-310001143513B+T Group Acquisition, Inc.(S) – Common Stock Warrant2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513glad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513Encore Dredging Holdings, LLC – Term Debt 12023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513glad:PreferredEquityMemberglad:DiversifiedConglomerateManufacturingMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513Edge Adhesives Holdings, Inc. – Preferred Stock2023-12-310001143513glad:DiversifiedConglomerateServicesMemberglad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513Encore Dredging Holdings, LLC – Preferred Stock2023-12-310001143513glad:PreferredEquityMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513Canopy Safety Brands, LLC – Preferred Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513glad:CommonEquityEquivalentsMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513Canopy Safety Brands, LLC – Common Stock2023-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513Lonestar EMS, LLC – Term Debt2023-12-310001143513glad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513WB Xcel Holdings, LLC – Line of Credit2023-12-310001143513WB Xcel Holdings, LLC – Term Debt 2023-12-310001143513glad:PrintingAndPublishingMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513TNCP Intermediate HoldCo, LLC – Line of Credit2023-12-310001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513glad:AutomobileMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513Defiance Integrated Technologies, Inc. – Term Debt 2023-12-310001143513glad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513glad:PreferredEquityMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513WB Xcel Holdings, LLC - Preferred Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513glad:AutomobileMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513Defiance Integrated Technologies, Inc. – Common Stock2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DiversifiedConglomerateManufacturingMember2023-12-310001143513Lonestar EMS, LLC – Common Units2023-12-310001143513glad:PrintingAndPublishingMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513TNCP Intermediate HoldCo, LLC – Common Equity Units2023-12-310001143513us-gaap:CollateralPledgedMember2023-12-310001143513glad:SecuredOvernightFinancingRateSOFRMember2023-12-310001143513glad:SecuredOvernightFinancingRateSOFR_90DayMember2023-12-310001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:AerospaceAndDefenseMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Antenna Research Associates, Inc. – Term Debt2023-09-300001143513Ohio Armor Holdings, LLC – Term Debt2023-09-300001143513SpaceCo Holdings, LLC – Line of Credit2023-09-300001143513SpaceCo Holdings, LLC – Term Debt2023-09-300001143513glad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Cafe Zupas – Line of Credit2023-09-300001143513Café Zupas – Delayed Draw Term Loan2023-09-300001143513Café Zupas – Term Debt2023-09-300001143513Eegee’s LLC – Line of Credit2023-09-300001143513Eegee’s LLC – Delayed Draw Term Loan2023-09-300001143513Eegee’s LLC – Term Debt2023-09-300001143513Salt & Straw, LLC – Line of Credit2023-09-300001143513Salt & Straw, LLC – Delayed Draw Term Loan2023-09-300001143513Sokol & Company Holdings, LLC – Term Debt 2023-09-300001143513glad:BuildingsAndRealEstateMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513GFRC 360, LLC – Line of Credit2023-09-300001143513GFRC 360, LLC – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Engineering Manufacturing Technologies, LLC – Line of Credit2023-09-300001143513Engineering Manufacturing Technologies, LLC – Term Debt2023-09-300001143513NeoGraf Solutions LLC – Line of Credit2023-09-300001143513NeoGraf Solutions LLC – Term Debt2023-09-300001143513OCI, LLC – Term Debt 12023-09-300001143513Salvo Technologies, Inc. – Term Debt2023-09-300001143513Unirac Holdings, Inc. – Line of Credit2023-09-300001143513Unirac Holdings, Inc. – Delayed Draw Term Loan2023-09-300001143513Unirac Holdings, Inc. – Term Debt2023-09-300001143513Viva Railings, LLC – Line of Credit2023-09-300001143513Viva Railings, LLC – Term Debt2023-09-300001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Axios Industrial Group, LLC – Term Debt2023-09-300001143513DKI Ventures, LLC – Line of Credit2023-09-300001143513DKI Ventures, LLC – Term Debt2023-09-300001143513ENET Holdings, LLC – Term Debt2023-09-300001143513Fix-It Group, LLC – Line of Credit2023-09-300001143513Fix-It Group, LLC – Term Debt2023-09-300001143513Fix-It Group, LLC – Delayed Draw Term Loan2023-09-300001143513Leadpoint Business Services, LLC – Term Debt2023-09-300001143513MCG Energy Solutions, LLC – Term Debt2023-09-300001143513Trowbridge Chicago, LLC – Line of Credit2023-09-300001143513Trowbridge Chicago, LLC – Term Debt 2023-09-300001143513WorkforceQA, LLC – Line of Credit2023-09-300001143513WorkforceQA, LLC – Term Debt 12023-09-300001143513WorkforceQA, LLC – Term Debt 22023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:HealthcareEducationAndChildcareMember2023-09-300001143513ALS Education, LLC – Line of Credit2023-09-300001143513ALS Education, LLC – Term Debt2023-09-300001143513HH-Inspire Acquisition, Inc. – Line of Credit2023-09-300001143513HH-Inspire Acquisition, Inc. – Term Debt 12023-09-300001143513HH-Inspire Acquisition, Inc. – Term Debt 22023-09-300001143513Pansophic Learning, Ltd. – Term Debt 12023-09-300001143513Pansophic Learning, Ltd. – Term Debt 22023-09-300001143513Technical Resource Management, LLC – Line of Credit2023-09-300001143513Technical Resource Management, LLC – Term Debt2023-09-300001143513Technical Resource Management, LLC – Delayed Draw Term Loan2023-09-300001143513Turn Key Health Clinics, LLC – Line of Credit2023-09-300001143513Turn Key Health Clinics, LLC – Term Debt2023-09-300001143513glad:MachineryMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Arc Drilling Holdings LLC – Line of Credit2023-09-300001143513Arc Drilling Holdings LLC – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:TelecommunicationsMember2023-09-300001143513B+T Group Acquisition, Inc. – Line of Credit2023-09-300001143513B+T Group Acquisition, Inc. – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:AutomobileMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513Sea Link International IRB, Inc. – Term Debt 12023-09-300001143513Sea Link International IRB, Inc. – Term Debt 22023-09-300001143513glad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-3000011435138th Avenue Food & Provisions, Inc. – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513OCI, LLC – Term Debt 22023-09-300001143513Springfield, Inc. – Term Debt2023-09-300001143513Tailwind Smith Cooper Intermediate Corporation – Term Debt2023-09-300001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513CHA Holdings, Inc. – Term Debt2023-09-300001143513Gray Matter Systems, LLC – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:HealthcareEducationAndChildcareMember2023-09-300001143513Giving Home Health Care, LLC – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:OilAndGasIndustryMember2023-09-300001143513Imperative Holdings Corporation – Term Debt2023-09-300001143513us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-09-300001143513glad:DiversifiedConglomerateServicesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-09-300001143513Frontier Financial Group Inc. – Convertible Debt2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513glad:AutomobileMemberglad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Sea Link International IRB, Inc. – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberglad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Triple H Food Processors, LLC – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberglad:BuildingsAndRealEstateMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513GFRC 360, LLC – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMember2023-09-300001143513Salvo Technologies, Inc. – Preferred Stock2023-09-300001143513glad:DiversifiedConglomerateServicesMemberglad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Frontier Financial Group Inc. – Preferred Stock2023-09-300001143513Frontier Financial Group Inc. – Preferred Stock Warrant2023-09-300001143513MCG Energy Solutions, LLC – Preferred Stock2023-09-300001143513Trowbridge Chicago, LLC – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:HealthcareEducationAndChildcareMember2023-09-300001143513HH-Inspire Acquisition, Inc. – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:OilAndGasIndustryMember2023-09-300001143513FES Resources Holdings LLC – Preferred Equity Units2023-09-300001143513Imperative Holdings Corporation – Preferred Equity Units2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:TelecommunicationsMember2023-09-300001143513B+T Group Acquisition, Inc.(S) – Preferred Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:AerospaceAndDefenseMember2023-09-300001143513Antenna Research Associates, Inc. – Common Equity Units2023-09-300001143513Ohio Armor Holdings, LLC – Common Equity2023-09-300001143513glad:AutomobileMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Sea Link International IRB, Inc.– Common Equity Units2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:BeverageFoodAndTobaccoMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Salt & Straw, LLC – Common Warrant2023-09-300001143513Sokol & Company Holdings, LLC – Common Stock2023-09-300001143513Triple H Food Processors, LLC – Common Stock2023-09-300001143513glad:BuildingsAndRealEstateMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513GFRC 360, LLC – Common Stock Warrants2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:DiversifiedConglomerateManufacturingMember2023-09-300001143513Engineering Manufacturing Technologies, LLC – Common Stock2023-09-300001143513OCI, LLC – Common Units2023-09-300001143513NeoGraf Solutions LLC – Common Stock2023-09-300001143513glad:DiversifiedConglomerateServicesMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513WorkforceQA, LLC – Common Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:HealthcareEducationAndChildcareMember2023-09-300001143513Giving Home Health Care, LLC – Warrant2023-09-300001143513GSM MidCo LLC – Common Stock2023-09-300001143513Leeds Novamark Capital I, L.P. – Limited Partnership Interest2023-09-300001143513Technical Resource Management, LLC – Common Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:MachineryMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Arc Drilling Holdings LLC – Common Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:OilAndGasIndustryMember2023-09-300001143513FES Resources Holdings LLC – Common Equity Units2023-09-300001143513Total Safety Holdings, LLC – Common Equity2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513Funko Acquisition Holdings, LLC(S) – Common Units2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:TelecommunicationsMember2023-09-300001143513B+T Group Acquisition, Inc.(S) – Common Stock Warrant2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513glad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513Edge Adhesives Holdings, Inc. – Term Debt2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513glad:PreferredEquityMemberglad:DiversifiedConglomerateManufacturingMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513Edge Adhesives Holdings, Inc. – Preferred Stock2023-09-300001143513glad:DiversifiedConglomerateServicesMemberglad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513Encore Dredging Holdings, LLC – Preferred Stock2023-09-300001143513glad:PreferredEquityMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513Canopy Safety Brands, LLC – Preferred Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513Canopy Safety Brands, LLC – Common Stock2023-09-300001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DiversifiedConglomerateManufacturingMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513Lonestar EMS, LLC – Term Debt2023-09-300001143513glad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513WB Xcel Holdings, LLC – Line of Credit2023-09-300001143513WB Xcel Holdings, LLC – Term Debt2023-09-300001143513glad:PrintingAndPublishingMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513TNCP Intermediate HoldCo, LLC—-Line of Credit2023-09-300001143513TNCP Intermediate HoldCo, LLC – Line of Credit2023-09-300001143513us-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:AutomobileMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513Defiance Integrated Technologies, Inc. – Term Debt2023-09-300001143513glad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513glad:PreferredEquityMemberglad:PersonalAndNonDurableConsumerProductsManufacturingOnlyMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513WB Xcel Holdings, LLC – Preferred Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513glad:AutomobileMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513Defiance Integrated Technologies, Inc. – Common Stock2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DiversifiedConglomerateManufacturingMember2023-09-300001143513Lonestar EMS, LLC – Common Units2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:MachineryMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513PIC 360, LLC – Common Equity Units2023-09-300001143513glad:PrintingAndPublishingMemberglad:CommonEquityEquivalentsMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513TNCP Intermediate HoldCo, LLC – Common Equity Units2023-09-300001143513us-gaap:CollateralPledgedMember2023-09-300001143513glad:SecuredOvernightFinancingRateSOFRMember2023-09-300001143513glad:SecuredOvernightFinancingRateSOFR_90DayMember2023-09-300001143513srt:MinimumMember2023-10-012023-12-310001143513srt:MaximumMember2023-10-012023-12-310001143513glad:EdgeAdhesivesHoldingsIncMember2023-12-310001143513glad:EdgeAdhesivesHoldingsIncMember2023-09-300001143513glad:OriginallyIssuedAtDiscountsMember2023-12-31glad:loan0001143513glad:OriginallyIssuedAtDiscountsMember2023-09-300001143513glad:OriginallyIssuedAtDiscountsMember2023-10-012023-12-310001143513glad:OriginallyIssuedAtDiscountsMember2022-10-012022-12-310001143513us-gaap:PaymentInKindPIKNoteMember2023-12-31glad:investment0001143513us-gaap:PaymentInKindPIKNoteMember2023-09-300001143513us-gaap:PaymentInKindPIKNoteMember2023-10-012023-12-310001143513us-gaap:PaymentInKindPIKNoteMember2022-10-012022-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel1Member2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel2Member2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Member2023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMemberus-gaap:FairValueInputsLevel1Member2023-12-310001143513us-gaap:FairValueInputsLevel2Memberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel1Memberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel2Memberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:UnsecuredDebtMember2023-12-310001143513glad:PreferredEquityMember2023-12-310001143513us-gaap:FairValueInputsLevel1Memberglad:PreferredEquityMember2023-12-310001143513us-gaap:FairValueInputsLevel2Memberglad:PreferredEquityMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:PreferredEquityMember2023-12-310001143513glad:CommonEquityEquivalentsMember2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel1Member2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel2Member2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Member2023-12-310001143513us-gaap:FairValueInputsLevel1Member2023-12-310001143513us-gaap:FairValueInputsLevel2Member2023-12-310001143513us-gaap:FairValueInputsLevel3Member2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel1Member2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel2Member2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Member2023-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMemberus-gaap:FairValueInputsLevel1Member2023-09-300001143513us-gaap:FairValueInputsLevel2Memberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513us-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel1Memberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel2Memberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:UnsecuredDebtMember2023-09-300001143513glad:PreferredEquityMember2023-09-300001143513us-gaap:FairValueInputsLevel1Memberglad:PreferredEquityMember2023-09-300001143513us-gaap:FairValueInputsLevel2Memberglad:PreferredEquityMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:PreferredEquityMember2023-09-300001143513glad:CommonEquityEquivalentsMember2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel1Member2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel2Member2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Member2023-09-300001143513us-gaap:FairValueInputsLevel1Member2023-09-300001143513us-gaap:FairValueInputsLevel2Member2023-09-300001143513us-gaap:FairValueInputsLevel3Member2023-09-300001143513glad:LeedsAcquisitionHoldingsLLCMember2023-12-310001143513glad:LeedsAcquisitionHoldingsLLCMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:PreferredEquityMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMemberglad:PreferredEquityMember2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberglad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberglad:PreferredEquityMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513glad:CommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-09-300001143513glad:FunkoAcquisitionHoldingsLLCMember2023-12-310001143513glad:FunkoAcquisitionHoldingsLLCMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:YieldAnalysisMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:YieldAnalysisMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:YieldAnalysisMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:YieldAnalysisMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberus-gaap:MeasurementInputDiscountRateMember2023-12-310001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513glad:YieldAnalysisMemberus-gaap:FairValueInputsLevel3Memberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberus-gaap:MeasurementInputDiscountRateMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMemberglad:IBPMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMemberglad:IBPMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberglad:IBPMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMemberglad:IBPMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMemberglad:IBPMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MarketQuoteMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberglad:IBPMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MinimumMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:MaximumMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:UnsecuredDebtMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberglad:PreferredAndCommonEquityEquivalentsMemberglad:TotalEnterpriseValueMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberglad:PreferredAndCommonEquityEquivalentsMemberglad:TotalEnterpriseValueMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MinimumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMemberglad:MeasurementInputEBITDAMembersrt:MaximumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberglad:MeasurementInputEBITDAMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:MeasurementInputRevenueMultipleMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MinimumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:TotalEnterpriseValueMembersrt:WeightedAverageMemberus-gaap:MeasurementInputRevenueMultipleMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MinimumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:MaximumMember2023-09-300001143513glad:PreferredAndCommonEquityEquivalentsMemberus-gaap:FairValueInputsLevel3Memberglad:MeasurementInputRevenueMemberglad:TotalEnterpriseValueMembersrt:WeightedAverageMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513us-gaap:UnsecuredDebtMember2023-09-300001143513glad:PreferredEquityMember2023-09-300001143513glad:CommonEquityEquivalentsMember2023-09-300001143513us-gaap:InvestmentsMember2023-09-300001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:UnsecuredDebtMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:PreferredEquityMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:CommonEquityEquivalentsMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:InvestmentsMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2023-10-012023-12-310001143513us-gaap:UnsecuredDebtMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberglad:PreferredEquityMember2023-10-012023-12-310001143513glad:CommonEquityEquivalentsMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-10-012023-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:InvestmentsMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-10-012023-12-310001143513us-gaap:UnsecuredDebtMember2023-10-012023-12-310001143513glad:PreferredEquityMember2023-10-012023-12-310001143513glad:CommonEquityEquivalentsMember2023-10-012023-12-310001143513us-gaap:InvestmentsMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513us-gaap:UnsecuredDebtMember2023-12-310001143513glad:PreferredEquityMember2023-12-310001143513glad:CommonEquityEquivalentsMember2023-12-310001143513us-gaap:InvestmentsMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2022-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2022-09-300001143513us-gaap:UnsecuredDebtMember2022-09-300001143513glad:PreferredEquityMember2022-09-300001143513glad:CommonEquityEquivalentsMember2022-09-300001143513us-gaap:InvestmentsMember2022-09-300001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:DebtSecuritiesSecuredFirstLienDebtMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:UnsecuredDebtMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:PreferredEquityMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberglad:CommonEquityEquivalentsMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:InvestmentsMember2022-10-012022-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberglad:DebtSecuritiesSecuredSecondLienDebtMember2022-10-012022-12-310001143513us-gaap:UnsecuredDebtMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberglad:PreferredEquityMember2022-10-012022-12-310001143513glad:CommonEquityEquivalentsMemberglad:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-10-012022-12-310001143513glad:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:InvestmentsMember2022-10-012022-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2022-10-012022-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2022-10-012022-12-310001143513us-gaap:UnsecuredDebtMember2022-10-012022-12-310001143513glad:PreferredEquityMember2022-10-012022-12-310001143513glad:CommonEquityEquivalentsMember2022-10-012022-12-310001143513us-gaap:InvestmentsMember2022-10-012022-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2022-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2022-12-310001143513us-gaap:UnsecuredDebtMember2022-12-310001143513glad:PreferredEquityMember2022-12-310001143513glad:CommonEquityEquivalentsMember2022-12-310001143513us-gaap:InvestmentsMember2022-12-310001143513us-gaap:PrincipalOrProprietaryTransactionsMember2023-12-310001143513us-gaap:PrincipalOrProprietaryTransactionsMember2023-09-300001143513us-gaap:PrincipalOrProprietaryTransactionsMemberglad:InvestmentPortfolioBenchmarkMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:PrincipalOrProprietaryTransactionsMemberglad:InvestmentPortfolioBenchmarkMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:EnvironmentalMidcoIncMember2023-11-012023-11-300001143513glad:CafeZupasMember2023-11-012023-11-300001143513glad:PIC360LLCMember2023-11-012023-11-300001143513glad:ALSEducationLLCMember2023-12-012023-12-310001143513glad:LeadpointBusinessServicesLLCMember2023-12-012023-12-310001143513glad:SaltStrawLLCMember2023-12-012023-12-310001143513glad:SyndicatedInvestmentsMember2023-09-300001143513glad:SyndicatedInvestmentsMember2023-12-310001143513glad:InvestmentPortfolioBenchmarkMemberglad:InvestmentTypeConcentrationRiskMemberglad:SyndicatedInvestmentsMember2023-10-012023-12-310001143513glad:InvestmentPortfolioBenchmarkMemberglad:InvestmentTypeConcentrationRiskMemberglad:SyndicatedInvestmentsMember2022-10-012023-09-30glad:portfolioCompanyglad:stateglad:industry0001143513us-gaap:CustomerConcentrationRiskMemberglad:InvestmentPortfolioBenchmarkMemberglad:FiveLargestPortfolioInvestmentsMember2023-12-310001143513us-gaap:CustomerConcentrationRiskMemberglad:InvestmentPortfolioBenchmarkMemberglad:FiveLargestPortfolioInvestmentsMember2023-10-012023-12-310001143513us-gaap:CustomerConcentrationRiskMemberglad:InvestmentPortfolioBenchmarkMemberglad:FiveLargestPortfolioInvestmentsMember2023-09-300001143513us-gaap:CustomerConcentrationRiskMemberglad:InvestmentPortfolioBenchmarkMemberglad:FiveLargestPortfolioInvestmentsMember2022-10-012023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513glad:InvestmentOwnedAtFairValueMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredFirstLienDebtMember2023-09-300001143513glad:DebtSecuritiesSecuredFirstLienDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513glad:InvestmentOwnedAtFairValueMemberglad:DebtSecuritiesSecuredFirstLienDebtMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513glad:InvestmentOwnedAtFairValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513glad:DebtSecuritiesSecuredSecondLienDebtMember2023-09-300001143513glad:DebtSecuritiesSecuredSecondLienDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513glad:InvestmentOwnedAtFairValueMemberglad:DebtSecuritiesSecuredSecondLienDebtMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:UnsecuredDebtMember2023-12-310001143513us-gaap:UnsecuredDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513us-gaap:UnsecuredDebtMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:UnsecuredDebtMember2023-09-300001143513us-gaap:UnsecuredDebtMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513us-gaap:UnsecuredDebtMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:DebtSecuritiesMember2023-12-310001143513us-gaap:DebtSecuritiesMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513us-gaap:DebtSecuritiesMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:DebtSecuritiesMember2023-09-300001143513us-gaap:DebtSecuritiesMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513us-gaap:DebtSecuritiesMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:PreferredEquityMember2023-12-310001143513glad:PreferredEquityMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513glad:PreferredEquityMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513glad:PreferredEquityMember2023-09-300001143513glad:PreferredEquityMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513glad:PreferredEquityMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:CommonEquityEquivalentsMember2023-12-310001143513glad:CommonEquityEquivalentsMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513glad:CommonEquityEquivalentsMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513glad:CommonEquityEquivalentsMember2023-09-300001143513glad:CommonEquityEquivalentsMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513glad:CommonEquityEquivalentsMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:EquitySecuritiesMember2023-12-310001143513us-gaap:EquitySecuritiesMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513us-gaap:EquitySecuritiesMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:EquitySecuritiesMember2023-09-300001143513us-gaap:EquitySecuritiesMemberglad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513us-gaap:EquitySecuritiesMemberglad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2023-10-012023-12-310001143513glad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2023-10-012023-12-310001143513glad:InvestmentTypeConcentrationRiskMemberglad:InvestmentOwnedAtCostMember2022-10-012023-09-300001143513glad:InvestmentOwnedAtFairValueMemberglad:InvestmentTypeConcentrationRiskMember2022-10-012023-09-300001143513glad:DiversifiedConglomerateServicesMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:DiversifiedConglomerateServicesMemberglad:InvestmentOwnedAtFairValueMember2023-10-012023-12-310001143513glad:DiversifiedConglomerateServicesMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:DiversifiedConglomerateServicesMemberglad:InvestmentOwnedAtFairValueMember2022-10-012023-09-300001143513glad:HealthcareEducationAndChildcareMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:HealthcareEducationAndChildcareMember2023-10-012023-12-310001143513glad:HealthcareEducationAndChildcareMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:HealthcareEducationAndChildcareMember2022-10-012023-09-300001143513glad:DiversifiedConglomerateManufacturingMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:DiversifiedConglomerateManufacturingMember2023-10-012023-12-310001143513glad:DiversifiedConglomerateManufacturingMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:DiversifiedConglomerateManufacturingMember2022-10-012023-09-300001143513glad:AerospaceAndDefenseMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:AerospaceAndDefenseMember2023-10-012023-12-310001143513glad:AerospaceAndDefenseMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:AerospaceAndDefenseMember2022-10-012023-09-300001143513glad:BeverageFoodAndTobaccoMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:BeverageFoodAndTobaccoMemberglad:InvestmentOwnedAtFairValueMember2023-10-012023-12-310001143513glad:BeverageFoodAndTobaccoMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:BeverageFoodAndTobaccoMemberglad:InvestmentOwnedAtFairValueMember2022-10-012023-09-300001143513glad:AutomobileMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:AutomobileMemberglad:InvestmentOwnedAtFairValueMember2023-10-012023-12-310001143513glad:AutomobileMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:AutomobileMemberglad:InvestmentOwnedAtFairValueMember2022-10-012023-09-300001143513glad:OilAndGasIndustryMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:OilAndGasIndustryMember2023-10-012023-12-310001143513glad:OilAndGasIndustryMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:OilAndGasIndustryMember2022-10-012023-09-300001143513glad:PersonalAndNonDurableConsumerProductsMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:PersonalAndNonDurableConsumerProductsMember2023-10-012023-12-310001143513glad:PersonalAndNonDurableConsumerProductsMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:PersonalAndNonDurableConsumerProductsMember2022-10-012023-09-300001143513glad:MachineryMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:MachineryMemberglad:InvestmentOwnedAtFairValueMember2023-10-012023-12-310001143513glad:MachineryMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:MachineryMemberglad:InvestmentOwnedAtFairValueMember2022-10-012023-09-300001143513glad:OtherSectorsMember2023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:OtherSectorsMember2023-10-012023-12-310001143513glad:OtherSectorsMember2023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMemberglad:OtherSectorsMember2022-10-012023-09-300001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMember2023-10-012023-12-310001143513glad:IndustryConcentrationRiskMemberglad:InvestmentOwnedAtFairValueMember2022-10-012023-09-300001143513us-gaap:SouthRegionMember2023-12-310001143513glad:InvestmentOwnedAtFairValueMemberus-gaap:SouthRegionMemberglad:GeographicRegionsConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:SouthRegionMember2023-09-300001143513glad:InvestmentOwnedAtFairValueMemberus-gaap:SouthRegionMemberglad:GeographicRegionsConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:WestRegionMember2023-12-310001143513us-gaap:WestRegionMemberglad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:WestRegionMember2023-09-300001143513us-gaap:WestRegionMemberglad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:MidwestRegionMember2023-12-310001143513us-gaap:MidwestRegionMemberglad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:MidwestRegionMember2023-09-300001143513us-gaap:MidwestRegionMemberglad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2022-10-012023-09-300001143513us-gaap:NortheastRegionMember2023-12-310001143513glad:InvestmentOwnedAtFairValueMemberus-gaap:NortheastRegionMemberglad:GeographicRegionsConcentrationRiskMember2023-10-012023-12-310001143513us-gaap:NortheastRegionMember2023-09-300001143513glad:InvestmentOwnedAtFairValueMemberus-gaap:NortheastRegionMemberglad:GeographicRegionsConcentrationRiskMember2022-10-012023-09-300001143513glad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2023-10-012023-12-310001143513glad:InvestmentOwnedAtFairValueMemberglad:GeographicRegionsConcentrationRiskMember2022-10-012023-09-300001143513srt:ChiefExecutiveOfficerMemberus-gaap:RelatedPartyMemberglad:TheAdviserMember2023-12-310001143513srt:MinimumMember2020-04-012023-03-3100011435132022-04-012023-03-310001143513glad:TheAdministratorMembersrt:ChiefExecutiveOfficerMemberus-gaap:RelatedPartyMember2023-12-310001143513srt:ChiefExecutiveOfficerMemberus-gaap:RelatedPartyMemberglad:GladstoneSecuritiesLLCMember2023-12-310001143513us-gaap:RelatedPartyMember2023-10-012023-12-310001143513us-gaap:RelatedPartyMember2022-10-012022-12-310001143513us-gaap:RelatedPartyMemberglad:BaseManagementFeeDueToAdviserMember2023-12-310001143513us-gaap:RelatedPartyMemberglad:BaseManagementFeeDueToAdviserMember2023-09-300001143513us-gaap:RelatedPartyMemberglad:LoanServicingFeeDueToAdviserMember2023-12-310001143513us-gaap:RelatedPartyMemberglad:LoanServicingFeeDueToAdviserMember2023-09-300001143513us-gaap:RelatedPartyMemberglad:IncentiveFeeDueToAdviserMember2023-12-310001143513us-gaap:RelatedPartyMemberglad:IncentiveFeeDueToAdviserMember2023-09-300001143513us-gaap:RelatedPartyMember2023-12-310001143513us-gaap:RelatedPartyMember2023-09-300001143513glad:GladstoneInvestmentCorporationMemberus-gaap:RelatedPartyMember2023-12-310001143513glad:GladstoneInvestmentCorporationMemberus-gaap:RelatedPartyMember2023-09-300001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditAmendmentNo5Member2023-12-120001143513us-gaap:LineOfCreditMemberglad:SecuredOvernightFinancingRateSOFRTrancheOneMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditAmendmentNo5Member2023-06-162023-06-160001143513us-gaap:LineOfCreditMemberglad:SecuredOvernightFinancingRateSOFRThereafterMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditAmendmentNo5Member2023-06-162023-06-160001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditAmendmentNo5Memberglad:SecuredOvernightFinancingRateSOFRMember2023-06-162023-06-160001143513us-gaap:LineOfCreditMemberglad:RevolvingLineOfCreditAmendmentNo4Memberus-gaap:RevolvingCreditFacilityMember2023-06-160001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2023-12-310001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2023-09-300001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2023-10-012023-12-310001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2022-10-012022-12-31glad:obligor0001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2022-12-310001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:SecuredOvernightFinancingRateSOFRMemberglad:RevolvingLineOfCreditMember2023-10-012023-12-310001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:SecuredOvernightFinancingRateSOFRMemberglad:RevolvingLineOfCreditMember2022-10-012023-09-300001143513us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMemberglad:RevolvingLineOfCreditMember2022-10-012023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2023-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2022-09-300001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2023-10-012023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2022-10-012022-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2023-12-310001143513us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:LongTermDebtMember2022-12-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A775NotesDue2028Member2023-08-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A775NotesDue2028Member2023-08-012023-08-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A375NotesDue2027Member2021-11-300001143513us-gaap:NotesPayableOtherPayablesMemberglad:A375NotesDue2027Member2021-11-012021-11-300001143513us-gaap:NotesPayableOtherPayablesMemberglad:A375NotesDue2027Member2022-04-300001143513us-gaap:NotesPayableOtherPayablesMemberglad:A5125NotesDue2026Member2020-12-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A5125NotesDue2026Member2020-12-012020-12-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A5125NotesDue2026Member2021-03-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A5125NotesDue2026Member2021-03-012021-03-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A775NotesDue2028Member2023-12-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A5125NotesDue2026Member2023-12-310001143513us-gaap:NotesPayableOtherPayablesMemberglad:A375NotesDue2027Member2023-12-310001143513glad:DealerManagerAgreementMemberus-gaap:SeriesAPreferredStockMember2023-05-310001143513glad:DealerManagerAgreementMemberus-gaap:SeriesAPreferredStockMember2023-05-012023-05-310001143513glad:DealerManagerAgreementMemberus-gaap:SeriesAPreferredStockMember2023-05-012023-12-310001143513glad:CommonStockAtTheMarketOfferingsMember2021-05-310001143513glad:CommonStockAtTheMarketOfferingsMember2023-12-31glad:distribution00011435132023-10-312023-10-3100011435132023-11-302023-11-3000011435132023-12-292023-12-2900011435132022-10-312022-10-3100011435132022-11-302022-11-3000011435132022-12-302022-12-3000011435132022-10-012023-09-300001143513us-gaap:UnusedLinesOfCreditMember2023-10-012023-12-310001143513us-gaap:UnusedLinesOfCreditMember2022-10-012023-09-300001143513glad:DelayedDrawTermLoansMember2023-10-012023-12-310001143513glad:DelayedDrawTermLoansMember2022-10-012023-09-300001143513glad:UncalledCapitalCommitmentMember2023-10-012023-12-310001143513glad:UncalledCapitalCommitmentMember2022-10-012023-09-300001143513us-gaap:SubsequentEventMemberglad:CHAHoldingsIncMember2024-01-012024-01-310001143513us-gaap:SubsequentEventMember2024-01-170001143513us-gaap:SubsequentEventMember2024-01-312024-01-310001143513us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2024-02-292024-02-290001143513us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2024-03-292024-03-290001143513us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2024-01-012024-03-310001143513us-gaap:SubsequentEventMember2024-02-052024-02-050001143513us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2024-03-052024-03-050001143513us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2024-04-052024-04-050001143513us-gaap:SubsequentEventMemberus-gaap:SeriesAPreferredStockMember2024-02-020001143513glad:TheAdviserMemberglad:DavidGladstoneMember2023-12-310001143513glad:GladstoneCompaniesLtdMemberglad:DavidGladstoneMember2023-12-310001143513glad:GladstoneCompaniesLtdMemberglad:GladstoneCompaniesIncMember2023-12-310001143513glad:TheAdviserMemberglad:GladstoneCompaniesIncMember2023-12-310001143513us-gaap:SubsequentEventMemberglad:TheAdviserMemberglad:DavidGladstoneMember2024-01-240001143513us-gaap:SubsequentEventMemberglad:TheAdviserMemberglad:VotingTrustBoardMember2024-01-240001143513us-gaap:SubsequentEventMemberglad:TheAdviserMemberglad:VotingTrustBoardMember2024-01-242024-01-240001143513glad:A775NotesDue2028Member2023-10-012023-12-310001143513glad:A375NotesDue2027Member2023-10-012023-12-310001143513glad:A5125NotesDue2026Member2023-10-012023-12-310001143513glad:A775NotesDue2028375NotesDue2027And5125NotesDue2026Member2023-10-012023-12-31