v3.26.1
CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Investment Company, Net Assets [Roll Forward]              
Beginning balance (in shares)   52,912,796   45,051,000 52,912,796 45,051,000 36,076,000
Beginning balance   $ 883,633   $ 755,676 $ 883,633 $ 755,676 $ 590,408
Issuance of common stock         157,776 178,472 181,387
Cancellation of treasury stock             0
Share-based compensation         4,977 6,963 4,518
Issuance of common stock under restricted stock plan, net of forfeitures         0 0 0
Common stock withheld for payroll taxes upon vesting of restricted stock         (1,120) (2,708) (1,063)
Dividends to shareholders         (147,228) (125,267) (102,925)
Change in restoration plan liability         (41) (51) (38)
Reclassification for certain permanent book-to-tax differences         0 0 0
Net investment income $ 34,609 31,889 $ 27,842 28,859 135,467 118,182 110,005
Net realized loss on investments and extinguishment of debt             (40,256)
Net realized gain (loss) on investments, extinguishment of debt and disposal of fixed assets         3,360 (50,057)  
Net unrealized appreciation on investments $ (1,645) $ (20,592) $ 16,997 $ (15,535) $ (25,832) $ 2,423 $ 13,640
Ending balance (in shares) 60,577,181   52,912,796   60,577,181 52,912,796 45,051,000
Ending balance $ 1,010,992   $ 883,633   $ 1,010,992 $ 883,633 $ 755,676
Common Stock              
Investment Company, Net Assets [Roll Forward]              
Beginning balance (in shares)   52,912,796   45,050,759 52,912,796 45,050,759 36,076,425
Beginning balance   $ 13,228   $ 11,263 $ 13,228 $ 11,263 $ 9,604
Issuance of common stock (in shares)         7,396,112 7,694,740 8,733,315
Issuance of common stock         $ 1,849 $ 1,924 $ 2,183
Cancellation of treasury stock             $ (585)
Issuance of common stock under restricted stock plan, net of forfeitures (in shares)         320,903 274,575 293,816
Issuance of common stock under restricted stock plan, net of forfeitures         $ 80 $ 68 $ 74
Common stock withheld for payroll taxes upon vesting of restricted stock (in shares)         (52,630) (107,278) (52,797)
Common stock withheld for payroll taxes upon vesting of restricted stock         $ (13) $ (27) $ (13)
Ending balance (in shares) 60,577,181   52,912,796   60,577,181 52,912,796 45,050,759
Ending balance $ 15,144   $ 13,228   $ 15,144 $ 13,228 $ 11,263
Treasury Stock              
Investment Company, Net Assets [Roll Forward]              
Beginning balance   $ 0   $ 0 $ 0 $ 0 $ (23,937)
Beginning balance (in shares)   0   0 0 0 2,339,512
Cancellation of treasury stock (in shares)             (2,339,512)
Cancellation of treasury stock             $ 23,937
Ending balance $ 0   $ 0   $ 0 $ 0 $ 0
Ending balance (in shares) 0   0   0 0 0
Additional Paid-In Capital              
Investment Company, Net Assets [Roll Forward]              
Beginning balance   $ 959,123   $ 796,945 $ 959,123 $ 796,945 $ 646,586
Issuance of common stock         155,927 176,548 179,204
Cancellation of treasury stock             (23,352)
Share-based compensation         4,977 6,963 4,518
Issuance of common stock under restricted stock plan, net of forfeitures         (80) (68) (74)
Common stock withheld for payroll taxes upon vesting of restricted stock         (1,107) (2,681) (1,050)
Change in restoration plan liability         (41) (51) (38)
Reclassification for certain permanent book-to-tax differences         (43,945) (18,533) (8,849)
Ending balance $ 1,074,854   $ 959,123   1,074,854 959,123 796,945
Total Distributable Earnings (Loss)              
Investment Company, Net Assets [Roll Forward]              
Beginning balance   $ (88,718)   $ (52,532) (88,718) (52,532) (41,845)
Dividends to shareholders         (147,228) (125,267) (102,925)
Reclassification for certain permanent book-to-tax differences         43,945 18,533 8,849
Net investment income         135,467 118,182 110,005
Net realized loss on investments and extinguishment of debt             (40,256)
Net realized gain (loss) on investments, extinguishment of debt and disposal of fixed assets         3,360 (50,057)  
Net unrealized appreciation on investments         (25,832) 2,423 13,640
Ending balance $ (79,006)   $ (88,718)   $ (79,006) $ (88,718) $ (52,532)