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BORROWINGS - Revolving Line of Credit Narrative (Details) - USD ($) |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 08, 2021 | Aug. 10, 2020 | Sep. 30, 2022 | Mar. 31, 2022 | Aug. 09, 2020
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness asset coverage on our senior securities |  |  | 254.10% | 252.90% |
Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term | 2 years |  |  |  |
Option extension period |  |  | 1 year |  |
Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused fee percentage |  |  | 1.00% | 1.00% |
Credit Facility | Line of Credit | Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 180,000,000 | $ 180,000,000 | $ 180,000,000 | $ 200,000,000
Accordion feature, increase limit |  | $ 300,000,000 |  |  |
Covenant, required minimum net worth of mandatory redeemable term preferred stock |  |  | $ 210,000,000 |  |
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 |  |  | $ 286,500,000 |  |
Indebtedness asset coverage on our senior securities |  |  | 254.10% |  |
Senior security, indebtedness, asset coverage amount |  |  | $ 698,600,000 |  |
Credit Facility | Line of Credit | Revolving Line of Credit | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness asset coverage on our senior securities |  |  | 150.00% |  |
Credit Facility | Line of Credit | Revolving Line of Credit | Less than or Equal to 50% of Commitment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused fee percentage |  | 0.50% |  |  |
Credit Facility | Line of Credit | Revolving Line of Credit | Greater than 50% but Less than or Equal to 65% of Commitment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused fee percentage |  | 0.75% |  |  |
Credit Facility | Line of Credit | Revolving Line of Credit | Greater Than 65% Of Commitment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused fee percentage |  | 1.00% |  |  |
Credit Facility | LIBOR | Line of Credit | Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, variable rate floor |  | 0.50% | 0.50% | 0.50% |
Debt instrument, basis spread on variable rate |  |  | 2.85% | 2.85% |
Credit Facility | LIBOR, Tranche One | Line of Credit | Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.85% |  |  |
Credit Facility | LIBOR, Tranche Two | Line of Credit | Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.10% |  |  |
Credit Facility | LIBOR, Thereafter | Line of Credit | Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.35% |  |  |

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