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BORROWINGS - Revolving Line of Credit Narrative (Details) - Credit Facility - Line of Credit | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) obligor | Jun. 27, 2024 USD ($) | Jun. 26, 2024 USD ($) | Mar. 28, 2024 USD ($) | Mar. 27, 2024 USD ($) | Dec. 12, 2023 USD ($) | Dec. 11, 2023 USD ($) | Sep. 30, 2023 USD ($)
Revolving Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment amount | $ 268,659,000 |  |  |  |  |  |  | $ 223,659,000
Line of credit facility, accordion feature maximum borrowing capacity | $ 350,000,000 |  |  |  |  |  |  |
Debt instrument, covenant, borrowing base, minimum number of obligors | obligor | 25 |  |  |  |  |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock | $ 325,000,000.0 |  |  |  |  |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised | 50.00% |  |  |  |  |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock, minus percent of any equity or subordinated debt redeemed or retired | 50.00% |  |  |  |  |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised, minus percent of any equity or subordinated debt redeemed or retired | $ 412,000,000.0 |  |  |  |  |  |  |
Debt instrument, covenant, senior security, indebtedness, required minimum asset coverage ratio | 150.00% |  |  |  |  |  |  |
Senior security, indebtedness, asset coverage amount | $ 691,800,000 |  |  |  |  |  |  |
Indebtedness asset coverage on our senior securities | 234.60% |  |  |  |  |  |  |
Investment company, number of obligor | obligor | 34 |  |  |  |  |  |  |
Revolving Line of Credit | SOFR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.10% |  |  |  |  |  |  |
Revolving Line of Credit | Secured Overnight Financing Rate (SOFR), Tranche One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.00% |  |  |  |  |  |  |
Revolving Line of Credit | Secured Overnight Financing Rate (SOFR), Thereafter |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.50% |  |  |  |  |  |  |
Revolving Line of Credit - Amendment No. 5 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment amount |  |  |  |  |  | $ 233,700,000 | $ 223,700,000 |
Revolving Line of Credit - Amendment No. 6 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment amount |  |  |  | $ 243,700,000 | $ 233,700,000 |  |  |
Revolving Line of Credit - Amendment No. 7 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment amount |  | $ 268,700,000 | $ 243,700,000 |  |  |  |  |

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