v3.25.2
Financial Highlights (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Investment Company, Financial Highlights [Roll Forward]        
Net asset value per share at beginning of period (in dollars per share) $ 16.75 $ 18.72 $ 18.09 $ 19.63
Net investment income (in dollars per share) 0.38 0.54 1.37 1.63
Net unrealized appreciation (depreciation) (in dollars per share) (0.20) (0.33) (0.98) (0.28)
Net realized gains (losses) (in dollars per share) (0.15) (0.85) (0.28) (1.06)
(Provision) benefit for taxes on realized and unrealized gains (losses) (in dollars Per share) 0 0 0 (0.01)
Distributions of net investment income to stockholders (dollars per share) (0.42) (0.55) (1.44) (1.72)
Net asset value per share at end of period (in dollars per share) 16.76 18.19 16.76 18.19
Per share market value at beginning of period (in dollars per share) 15.36 19.66 16.31 20.12
Per share market value at end of period (in dollars per share) $ 13.66 $ 18.81 $ 13.66 $ 18.81
Total return (8.39%) (1.51%) (7.93%) 2.13%
Common shares outstanding at beginning of period (in shares) | shares 88,086 81,396 82,245 77,225
Common shares outstanding at end of period (in shares) | shares 88,086 82,245 88,086 82,245
Net assets at beginning of period | $ $ 1,475,113 $ 1,524,099 $ 1,487,811 $ 1,515,764
Net assets at end of period | $ 1,476,469 1,496,133 1,476,469 1,496,133
Average net assets | $ $ 1,488,823 $ 1,524,503 $ 1,487,303 $ 1,524,180
Ratio of net investment income to average net assets 9.02% 11.76% 10.50% 11.40%
Ratio of total expenses to average net assets 12.69% 14.54% 12.72% 14.42%
Ratio of net expenses to average net assets 11.24% 13.29% 10.97% 13.75%
Ratio of portfolio turnover to average investments at fair value 4.86% 5.95% 25.59% 23.97%
Weighted average outstanding debt | $ $ 1,477,143 $ 1,711,978 $ 1,595,421 $ 1,680,876
Average debt per share (dollars per share) $ 16.77 $ 20.92 $ 18.68 $ 21.06
Asset coverage ratio 199.86% 183.36% 199.86% 183.36%
Outstanding senior securities | $ $ 1,466,100 $ 1,743,400 $ 1,466,100 $ 1,743,400