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
 9 Months Ended 12 Months Ended
Dec. 31, 2024
Mar. 31, 2024
Debt Instrument [Line Items]    
Indebtedness asset coverage on our senior securities 185.90% 219.00%
Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Unused fee percentage 0.75% 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%
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 $ 412,900  
Indebtedness asset coverage on our senior securities 185.90%  
Senior security, indebtedness, asset coverage amount $ 943,900  
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, Adjustment    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 0.10% 0.10%
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% 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%