Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Revolving Line of Credit Narrative (Details)

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BORROWINGS - Revolving Line of Credit Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 30, 2023
Jun. 30, 2024
Mar. 31, 2024
Debt Instrument [Line Items]      
Indebtedness asset coverage on our senior securities   216.30% 219.00%
Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Unused fee percentage   1.00% 1.00%
Credit Facility | Revolving Line of Credit | Line of Credit      
Debt Instrument [Line Items]      
Commitment amount   $ 200,000 $ 200,000
Debt instrument, variable rate floor   0.35% 0.35%
Debt instrument, basis spread on variable rate   3.25% 3.25%
Covenant, required minimum net worth of mandatory redeemable term preferred stock   $ 210,000  
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   $ 348,700  
Indebtedness asset coverage on our senior securities   216.30%  
Senior security, indebtedness, asset coverage amount   $ 807,500  
Credit Facility | Revolving Line of Credit | Line of Credit | Minimum      
Debt Instrument [Line Items]      
Indebtedness asset coverage on our senior securities   150.00%  
Credit Facility | Revolving Line of Credit | Line of Credit | Less than or Equal to 50% of Commitment      
Debt Instrument [Line Items]      
Unused fee percentage 0.50%    
Credit Facility | Revolving Line of Credit | 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 | Revolving Line of Credit | Line of Credit | Greater Than 65% Of Commitment      
Debt Instrument [Line Items]      
Unused fee percentage 1.00%    
Credit Facility | Revolving Line of Credit | Line of Credit | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument, variable rate floor 0.35%    
Credit Facility | Revolving Line of Credit | Line of Credit | SOFR, Tranche One      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 3.15%    
Credit Facility | Revolving Line of Credit | Line of Credit | SOFR, Tranche Two      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 3.40%    
Credit Facility | Revolving Line of Credit | Line of Credit | SOFR, Thereafter      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 3.65%    
Credit Facility | Revolving Line of Credit | Line of Credit | SOFR, Thereafter, Adjustment      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 0.10%