XML 127 R65.htm IDEA: XBRL DOCUMENT
v3.23.3

COMMITMENTS AND CONTINGENCIES - Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Other Commitments [Line Items] |  |
Line of credit commitment | $ 45,231 | $ 74,846
Unused line of credit commitments |  |
Other Commitments [Line Items] |  |
Line of credit commitment | 32,349 | 36,225
Delayed draw term loans |  |
Other Commitments [Line Items] |  |
Line of credit commitment | 12,039 | 37,778
Uncalled capital commitment |  |
Other Commitments [Line Items] |  |
Line of credit commitment | $ 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: |