Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Revolving Line of Credit Narrative (Details)

v3.23.3
BORROWINGS - Revolving Line of Credit Narrative (Details) - Credit Facility - Line of Credit
12 Months Ended
Jun. 16, 2023
USD ($)
Sep. 12, 2022
May 13, 2022
USD ($)
Sep. 30, 2023
USD ($)
obligor
Sep. 30, 2022
USD ($)
Jun. 15, 2023
USD ($)
Oct. 31, 2022
USD ($)
Oct. 30, 2022
USD ($)
Sep. 20, 2022
USD ($)
Sep. 19, 2022
USD ($)
May 12, 2022
USD ($)
Revolving Line of Credit                      
Debt Instrument [Line Items]                      
Commitment amount     $ 175,000,000 $ 223,659,000 $ 225,000,000           $ 205,000,000
Unused fee percentage     0.35% 1.00% 0.50%            
Average unused fee percentage     35.00%                
Debt instrument, fee     $ 1,100,000                
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              
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       $ 408,900,000              
Covenant, senior security, indebtedness, required minimum asset coverage ratio       150.00%              
Senior security, indebtedness, asset coverage amount       $ 660,500,000              
Indebtedness asset coverage on our senior securities       231.10%              
Number of obligors | obligor       37              
Revolving Line of Credit | LIBOR                      
Debt Instrument [Line Items]                      
Debt instrument, variable rate floor     0.35%                
Revolving Line of Credit | LIBOR, Tranche One                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate     2.70%                
Revolving Line of Credit | LIBOR, Thereafter                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate     3.25%                
Revolving Line of Credit | Secured Overnight Financing Rate (SOFR)                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate       3.10% 2.81%            
Revolving Line of Credit - Amendment No. 1 | Secured Overnight Financing Rate (SOFR)                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate   0.11%                  
Revolving Line of Credit - Amendment No. 2                      
Debt Instrument [Line Items]                      
Commitment amount                 $ 225,000,000 $ 175,000,000  
Line of credit facility, increase in borrowing capacity                 $ 50,000,000    
Revolving Line of Credit - Amendment No. 3                      
Debt Instrument [Line Items]                      
Commitment amount             $ 245,000,000 $ 225,000,000      
Line of credit facility, increase in borrowing capacity             $ 20,000,000        
Revolving Line of Credit - Amendment No. 4                      
Debt Instrument [Line Items]                      
Commitment amount $ 223,700,000         $ 245,000,000          
Debt instrument, fee $ 1,200,000                    
Revolving Line of Credit - Amendment No. 4 | Secured Overnight Financing Rate (SOFR)                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate 0.10%                    
Revolving Line of Credit - Amendment No. 4 | SOFR, Tranche One                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate 3.00%                    
Revolving Line of Credit - Amendment No. 4 | SOFR, Thereafter                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate 3.50%