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BORROWINGS - Revolving Credit Facility Narrative (Details) - Credit Facility - Line of Credit |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
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Sep. 12, 2022 | May 13, 2022 USD ($) | Mar. 31, 2023 USD ($) obligor | Sep. 30, 2022 USD ($) | Oct. 31, 2022 USD ($) | Oct. 30, 2022 USD ($) | Sep. 20, 2022 USD ($) | Sep. 19, 2022 USD ($) | May 12, 2022 USD ($)
Revolving Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 175,000,000 | $ 245,000,000 | $ 225,000,000 |  |  |  |  | $ 205,000,000
Unused fee percentage |  | 0.35% | 0.75% | 0.50% |  |  |  |  |
Average unused fee percentage |  | 35.00% |  |  |  |  |  |  |
Debt instrument, fee |  | $ 1,100,000 |  |  |  |  |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock |  |  | $ 325,000,000 |  |  |  |  |  |
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 |  |  | $ 349,100,000 |  |  |  |  |  |
Senior security, indebtedness, asset coverage amount |  |  | $ 539,100,000 |  |  |  |  |  |
Indebtedness asset coverage on our senior securities |  |  | 195.50% |  |  |  |  |  |
Investment company, number of obligor | obligor |  |  | 34 |  |  |  |  |  |
Revolving Line of Credit | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, variable rate floor |  | 0.35% |  |  |  |  |  |  |
Revolving Line of Credit | LIBOR, Tranche One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.70% |  |  |  |  |  |  |
Revolving Line of Credit | LIBOR, Thereafter |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.25% |  |  |  |  |  |  |
Revolving Line of Credit | SOFR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 3.00% | 2.81% |  |  |  |  |
Revolving Line of Credit - Amendment No. 1 | SOFR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.11% |  |  |  |  |  |  |  |
Revolving Line of Credit - Amendment No. 2 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 225,000,000 | $ 175,000,000 |
Line of credit facility, increase in borrowing capacity |  |  |  |  |  |  | $ 50,000,000 |  |
Revolving Line of Credit - Amendment No. 3 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 245,000,000 | $ 225,000,000 |  |  |
Line of credit facility, increase in borrowing capacity |  |  |  |  | $ 20,000,000 |  |  |  |

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