Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Revolving Credit Facility Narrative (Details)

v3.25.0.1
BORROWINGS - Revolving Credit Facility Narrative (Details) - Credit Facility - Line of Credit - Revolving Line of Credit
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
obligor
Sep. 30, 2024
USD ($)
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 293,659,000 $ 293,659,000
Line of credit facility, accordion feature maximum borrowing capacity $ 350,000,000  
Debt instrument, basis spread on variable rate 3.10% 3.10%
Debt instrument, covenant, borrowing base, minimum number of obligors | obligor 25  
Covenant, required minimum net worth of mandatory redeemable term preferred stock $ 325,000,000.0  
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 $ 421,300,000  
Debt instrument, covenant, senior security, indebtedness, required minimum asset coverage ratio 150.00%  
Senior security, indebtedness, asset coverage amount $ 733,800,000  
Indebtedness asset coverage on our senior securities 250.80%  
Investment company, number of obligor | obligor 33  
Secured Overnight Financing Rate (SOFR)    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 0.10%  
Secured Overnight Financing Rate (SOFR), Tranche One    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 3.00%  
Secured Overnight Financing Rate (SOFR), Thereafter    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 3.50%