XML 119 R57.htm IDEA: XBRL DOCUMENT
v3.23.3

REGISTRATION STATEMENT AND COMMON EQUITY OFFERINGS (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Aug. 31, 2022
Government Assistance [Line Items] |  |
Sale of stock, aggregate value of securities authorized | $ 300,000,000 |
Sale of stock, remaining capacity of aggregate value of securities authorized | $ 151,100,000 |
Common Stock At-the-Market Offerings |  |
Government Assistance [Line Items] |  |
Sale of stock, aggregate offering price authorized |  | $ 100,000,000
Sale of stock, number of shares issued in transaction (in shares) | 8,774,101 |
Sale of stock, price (in USD per share) | $ 9.96 |
Sale of stock, gross proceeds from transaction | $ 87,400,000 |
Sale of stock, consideration received on transaction | 85,900,000 |
Sale of stock, remaining capacity of authorized offering price | $ 400,000 |

X
- Definition Sale of Stock, Aggregate Offering Price Authorized + References No definition available. + Details
Name: | glad_SaleOfStockAggregateOfferingPriceAuthorized
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sale of Stock, Aggregate Value of Securities Authorized + References No definition available. + Details
Name: | glad_SaleOfStockAggregateValueOfSecuritiesAuthorized
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sale of Stock, Gross Proceeds From Transaction + References No definition available. + Details
Name: | glad_SaleOfStockGrossProceedsFromTransaction
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Stock, Remaining Capacity of Aggregate Value of Securities Authorized + References No definition available. + Details
Name: | glad_SaleOfStockRemainingCapacityOfAggregateValueOfSecuritiesAuthorized
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sale of Stock, Remaining Capacity of Offering Price Authorized + References No definition available. + Details
Name: | glad_SaleOfStockRemainingCapacityOfOfferingPriceAuthorized
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483507/832-10-50-3 + Details
Name: | us-gaap_GovernmentAssistanceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=glad_CommonStockAtTheMarketOfferingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |