v3.26.3
SUMMARY OF PER SHARE INFORMATION (Details) - $ / shares
 3 Months Ended 6 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Mar. 31, 2026
Per Share Data:          
Investment income (in usd per share)     $ 2.03 $ 2.05  
Operating expenses (in usd per share)     (0.89) (0.84)  
Income taxes (in usd per share)     0 (0.05)  
Net investment income per share – basic (in usd per share) $ 0.56 $ 0.57 1.14 1.16  
Net realized gain (loss), net of tax (in usd per share)     0.04 0.19  
Net unrealized (depreciation) appreciation on investments, net of tax (in usd per share)     (0.43) (0.40)  
Realized loss on extinguishment of debt (in usd per share)     (0.02) 0  
Total increase from investment operations (in usd per share)     0.73 0.95  
Accretive (dilutive) effect of share issuances and repurchases (in usd per share)     0.57 0.31  
Dividends to shareholders (in usd per share)     (1.28) (1.28)  
Issuance of restricted stock (in usd per share)     (0.15) (0.10)  
Common stock withheld for payroll taxes upon vesting of restricted stock (in usd per share)     (0.05) (0.04)  
Share based compensation expense (in usd per share)     0.05 0.04  
Other (in usd per share)     0.08 0.04  
Decrease in net asset value (in usd per share)     (0.05) (0.08)  
Net asset value          
Beginning of period (in usd per share)     16.69 16.70  
End of period (in usd per share) 16.64 16.62 $ 16.64 $ 16.62  
Ratios and Supplemental Data          
Ratio of operating expenses to average net assets     10.61% 9.94%  
Ratio of operating expenses (excluding interest expense) to average net assets     3.14% 3.20%  
Ratio of net investment income to average net assets     13.62% 13.75%  
Portfolio turnover     10.77% 8.08%  
Total investment return     10.19% 0.65%  
Total return based on change in NAV     7.37% 7.19%  
Per share market value at the end of the period (in usd per share) $ 23.13 $ 21.86 $ 23.13 $ 21.86  
Weighted-average basic shares outstanding (in shares) 63,648,525 55,544,095 62,401,982 54,536,084  
Weighted-average diluted shares outstanding (in shares) 73,036,538 64,830,413 71,777,799 63,809,345  
Common shares outstanding at end of period (in shares) 66,491,300 56,967,000,000 66,491,300 56,967,000,000 60,577,181