Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Revolving Line of Credit Narrative (Details)

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BORROWINGS - Revolving Line of Credit Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 30, 2023
Apr. 10, 2023
Mar. 31, 2024
Mar. 31, 2023
Feb. 05, 2024
Feb. 04, 2024
Oct. 29, 2023
Debt Instrument [Line Items]              
Indebtedness asset coverage on our senior securities     219.00% 244.70%      
Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, term 2 years            
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 $ 135,000   $ 200,000 $ 180,000 $ 200,000 $ 135,000 $ 180,000
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     219.00%        
Senior security, indebtedness, asset coverage amount     $ 822,400        
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 | Secured Overnight Financing Rate (SOFR) | Line of Credit | Revolving Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, variable rate floor     0.35%        
Debt instrument, basis spread on variable rate   0.11% 3.25%        
Credit Facility | SOFR, Tranche One | Line of Credit | Revolving Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     3.15%        
Credit Facility | SOFR, Tranche Two | Line of Credit | Revolving Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     3.40%        
Credit Facility | SOFR, Thereafter | Line of Credit | Revolving Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     3.65%        
Credit Facility | SOFR, Thereafter, Adjustment | Line of Credit | Revolving Line of Credit              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     0.10%