v3.25.2
Share Data and Distributions - Schedule of Changes in Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Investment Company, Net Assets [Roll Forward]                
Net assets at beginning of period $ 3,777,014 $ 3,412,316 $ 3,164,340 $ 2,470,746 $ 2,005,171 $ 1,529,205 $ 3,164,340 $ 1,529,205
Issuance of Common Shares in private and public offering 612,027 399,629 251,493 417,046 457,830 468,787    
Issuance of Common Shares under distribution reinvestment plan 26,795 25,204 23,524 18,165 16,057 11,647 75,523 45,869
Shares repurchased, net of early repurchase deduction (175,010) (21,923) (20,909) (16,544) (8,217) (10,526)    
Net investment income 82,956 77,254 72,205 61,642 53,929 35,803 232,415 151,374
Net unrealized appreciation (depreciation) 16,793 (30,913) 963 (3,198) (655) 16,919    
Net realized gains (losses) (15,991) 6,540 3,677 (59) 3,347 453    
Provision for income tax (expense) benefit (3) 19 (65) (158) (144) (241) (49) (543)
Distributions to shareholders (107,821) (91,112) (82,912) (68,254) (56,572) (46,876)    
Net assets at end of period $ 4,216,760 $ 3,777,014 $ 3,412,316 $ 2,879,386 $ 2,470,746 $ 2,005,171 $ 4,216,760 $ 2,879,386
Common Shares                
Investment Company, Net Assets [Roll Forward]                
Beginning of period, shares outstanding (in shares) 162,226 145,073 134,288 104,627 84,898 64,896 134,288 64,896
Net assets at beginning of period $ 1,622 $ 1,451 $ 1,343 $ 1,046 $ 849 $ 649 $ 1,343 $ 649
Issuance of Common Shares in private and public offering (in shares) 26,377 17,030 10,676 17,673 19,399 19,952    
Issuance of Common Shares in private and public offering $ 264 $ 171 $ 107 $ 177 $ 194 $ 199    
Issuance of Common Shares under distribution reinvestment plan (in shares) 1,164 1,065 999 767 679 496    
Issuance of Common Shares under distribution reinvestment plan $ 12 $ 10 $ 10 $ 8 $ 7 $ 5    
Shares repurchased, net of early repurchase deduction (in shares) (7,563) (942) (890) (703) (349) (446)    
Shares repurchased, net of early repurchase deduction $ (76) $ (10) $ (9) $ (7) $ (4) $ (4)    
End of period (in shares) 182,204 162,226 145,073 122,364 104,627 84,898 182,204 122,364
Net assets at end of period $ 1,822 $ 1,622 $ 1,451 $ 1,224 $ 1,046 $ 849 $ 1,822 $ 1,224
Additional Paid-in-Capital                
Investment Company, Net Assets [Roll Forward]                
Net assets at beginning of period 3,827,485 3,424,746 3,170,746 2,471,486 2,006,013 1,536,305 3,170,746 1,536,305
Issuance of Common Shares in private and public offering 611,763 399,458 251,386 416,869 457,636 468,588    
Issuance of Common Shares under distribution reinvestment plan 26,783 25,194 23,514 18,157 16,050 11,642    
Shares repurchased, net of early repurchase deduction (174,934) (21,913) (20,900) (16,537) (8,213) (10,522)    
Net assets at end of period 4,291,097 3,827,485 3,424,746 2,889,975 2,471,486 2,006,013 4,291,097 2,889,975
Accumulated Distributable Earnings (Loss)                
Investment Company, Net Assets [Roll Forward]                
Net assets at beginning of period (52,093) (13,881) (7,749) (1,786) (1,691) (7,749) (7,749) (7,749)
Net investment income 82,956 77,254 72,205 61,642 53,929 35,803    
Net unrealized appreciation (depreciation) 16,793 (30,913) 963 (3,198) (655) 16,919    
Net realized gains (losses) (15,991) 6,540 3,677 (59) 3,347 453    
Provision for income tax (expense) benefit (3) 19 (65) (158) (144) (241)    
Distributions to shareholders (107,821) (91,112) (82,912) (68,254) (56,572) (46,876)    
Net assets at end of period $ (76,159) $ (52,093) $ (13,881) $ (11,813) $ (1,786) $ (1,691) $ (76,159) $ (11,813)