Quarterly report [Sections 13 or 15(d)]

BORROWINGS - Revolving Credit Facility Narrative (Details)

v3.25.4
BORROWINGS - Revolving Credit Facility Narrative (Details) - Credit Facility - Line of Credit - Revolving Line of Credit
 3 Months Ended 12 Months Ended
Nov. 25, 2025
USD ($)
Dec. 31, 2025
USD ($)
obligor
Sep. 30, 2025
USD ($)
Debt Instrument [Line Items]      
Increase in borrowing capacity $ 20,000,000    
Line of credit facility, maximum borrowing capacity   $ 340,000,000 $ 320,000,000
Line of credit facility, accordion feature maximum borrowing capacity   $ 400,000,000  
Debt instrument, basis spread on variable rate   2.60% 2.60%
Debt instrument, covenant, borrowing base, minimum number of obligors | obligor   25  
Covenant, required minimum net worth of mandatory redeemable term preferred stock   $ 500,000,000.0  
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   $ 483,000,000.0  
Debt instrument, covenant, senior security, indebtedness, required minimum asset coverage ratio   150.00%  
Senior security, indebtedness, asset coverage amount   $ 668,100,000  
Indebtedness asset coverage on our senior securities   219.50%  
Investment company, number of obligor | obligor   36  
Secured Overnight Financing Rate (SOFR), Tranche One      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   2.60%  
Secured Overnight Financing Rate (SOFR), Thereafter      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   3.10%