v3.26.1
Borrowings - Schedule of Debt Securitization (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]        
Amortization of debt issuance costs   $ 4,061 $ 1,644 $ 327
Cash paid for interest expense   $ 54,654 $ 26,791 $ 4,842
Annualized average stated interest rate   6.90% 8.20% 7.10%
Average outstanding balance $ 12,757 $ 939,931 $ 465,362 $ 101,802
Average outstanding balance   939,931 465,362 101,802
2025 Debt Securitization        
Debt Instrument [Line Items]        
Stated interest expense   13,664 0 0
Amortization of debt issuance costs   214 0 0
Total interest expense   13,878 0 0
Cash paid for interest expense   $ 0 0 0
Annualized average stated interest rate   6.10%    
Average outstanding balance   $ 225,542 0 0
PNC Facility        
Debt Instrument [Line Items]        
Stated interest expense   8,245 23,367 6,777
Facility fees   84 129 39
Amortization of debt issuance costs   1,004 1,122 327
Total interest expense   9,333 24,618 7,143
Cash paid for interest expense   $ 14,755 $ 19,615 $ 4,684
Annualized average stated interest rate   6.70% 7.70% 6.80%
Average outstanding balance   $ 123,928 $ 305,019 $ 100,127
DB Credit Facility        
Debt Instrument [Line Items]        
Stated interest expense   15,258 7,882 0
Facility fees   934 499 0
Amortization of debt issuance costs   918 274 0
Total interest expense   17,110 8,655 0
Cash paid for interest expense   $ 18,261 $ 3,427 0
Annualized average stated interest rate   6.50% 7.70%  
Average outstanding balance   $ 234,266 $ 102,313 0
BNP Credit Facility        
Debt Instrument [Line Items]        
Stated interest expense   22,153 914 0
Amortization of debt issuance costs   1,925 248 0
Total interest expense   24,078 1,162 0
Cash paid for interest expense   $ 21,498 $ 0 0
Annualized average stated interest rate   6.30% 7.30%  
Average outstanding balance   $ 349,688 $ 12,454 0
Adviser Revolver        
Debt Instrument [Line Items]        
Stated interest expense   267 68 84
Cash paid for interest expense   $ 140 $ 67 $ 158
Annualized average stated interest rate   4.10% 5.00% 5.00%
Average outstanding balance   $ 6,507 $ 1,361 $ 1,675
Other Short-Term Borrowings        
Debt Instrument [Line Items]        
Stated interest expense   0 3,682 0
Cash paid for interest expense   $ 0 $ 3,682 0
Annualized average stated interest rate   0.00% 8.30%  
Average outstanding balance   $ 0 $ 44,215 $ 0