XML 76 R58.htm IDEA: XBRL DOCUMENT
v3.24.0.1

COMMITMENTS AND CONTINGENCIES - Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023
Other Commitments [Line Items] |  |
Total | $ 54,710 | $ 45,231
Unused line of credit commitments |  |
Other Commitments [Line Items] |  |
Total | 32,592 | 32,349
Delayed draw term loans |  |
Other Commitments [Line Items] |  |
Total | 21,275 | 12,039
Uncalled capital commitment |  |
Other Commitments [Line Items] |  |
Total | $ 843 | $ 843

X
- Definition Amount of funds committed to investment company from investors. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480737/946-205-50-25 + Details
Name: | us-gaap_InvestmentCompanyCommittedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=glad_DelayedDrawTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=glad_UncalledCapitalCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |