v3.26.1
Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Investment Company, Financial Highlights [Roll Forward]            
Net asset value at beginning of period (in dollars per share) $ 15.00 $ 15.00        
Distribution declared (in dollars per share) (0.76) (1.29)        
Net investment income - after tax (in dollars per share) 1.18 1.22        
Net realized gain (loss) on investment transactions (in dollars per share) 0.02 0.00        
Net change in unrealized appreciation (depreciation) on investment transactions (in dollars per share) (0.44) 0.07        
Net asset value at end of period (in dollars per share) $ 15.00 $ 15.00        
Total return based on net asset value per share 5.11% 8.86%        
Number of common shares outstanding (in shares) 81,864,005.909 66,397,771.207   71,236,992.933    
Ratio of net investment income - after tax to average net assets 10.53% 10.87%        
Ratio of total expenses to average net assets 11.83% 13.25%        
Ratio of management fee waiver to average net assets (1.87%) (1.83%)        
Ratio of incentive fee waiver to average net assets (0.86%) (0.91%)        
Ratio of incentive fees to average net assets 1.61% 1.85%        
Ratio of net expenses to average net assets 9.10% 10.51%        
Ratio of total expenses (without incentive fees) to average net assets 10.22% 11.40%        
Total return based on average net asset value 4.91% 8.63%        
Total return based on average net asset value - annualized 6.57% 11.54%        
Net assets at end of period $ 1,227,961 $ 995,967 $ 1,212,389 $ 1,068,555 $ 835,546 $ 650,202
Average debt outstanding $ 1,344,035 $ 861,741        
Average debt outstanding per share (in dollars per share) $ 16.42 $ 12.98        
Portfolio Turnover 9.81% 6.89%        
Asset coverage ratio (in percent) 181.22% 182.58%        
Asset coverage ratio per unit (in dollars per share) $ 1,812 $ 1,826