v3.26.3
Fair Value Measurements - Summary of Changes in Fair Value of Investments for Level 3 Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Net realized gains (losses) $ (25) $ 12 $ (162) $ (99) $ (7,092)
Level 3          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value, beginning of period 1,511,947 866,964 1,291,490 444,206 444,206
Purchases of investments 268,761 143,436 781,154 682,288  
Payment-in-kind 611 1,178 2,542 1,561  
Proceeds from investments, net (82,341) (31,907) (373,835) (149,735)  
Net change in unrealized gain (loss) (613) 1,281 (7,979) 924  
Net realized gains (losses) (24)   (24) (13)  
Net amortization/accretion of premium/discount on investments 907 870 5,900 2,591  
Fair value, end of period 1,699,248 981,822 1,699,248 981,822 1,291,490
Net change in unrealized gain (loss) still held (611) 1,555 (7,661) 1,407  
Level 3 | First-Lien Senior Secured Debt Investments          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value, beginning of period 1,383,321 755,533 1,162,717 395,206 395,206
Purchases of investments 266,761 143,436 779,154 619,997  
Proceeds from investments, net (82,216) (31,782) (371,344) (149,359)  
Net change in unrealized gain (loss) (555) 326 (7,885) 73  
Net realized gains (losses) (24)   (24) (13)  
Net amortization/accretion of premium/discount on investments 819 804 5,488 2,413  
Fair value, end of period 1,568,106 868,317 1,568,106 868,317 1,162,717
Net change in unrealized gain (loss) still held (554) 600 (7,567) 556  
Level 3 | Second Lien Senior Secured Debt Investments          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value, beginning of period 46,605 48,765 48,987 49,000 49,000
Proceeds from investments, net (125) (125) (2,491) (376)  
Net change in unrealized gain (loss) (435) 422 (582) 351  
Net amortization/accretion of premium/discount on investments 30 23 161 110  
Fair value, end of period 46,075 49,085 46,075 49,085 48,987
Net change in unrealized gain (loss) still held (435) 422 (582) 351  
Level 3 | Unsecured Debt Investments          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value, beginning of period 82,021 62,666 79,786    
Purchases of investments       62,291  
Payment-in-kind 611 1,178 2,542 1,561  
Net change in unrealized gain (loss) 377 533 488 500  
Net amortization/accretion of premium/discount on investments 58 43 251 68  
Fair value, end of period 83,067 64,420 83,067 64,420 $ 79,786
Net change in unrealized gain (loss) still held 378 $ 533 488 $ 500  
Level 3 | Equity Investments          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Purchases of investments 2,000   2,000    
Fair value, end of period $ 2,000   $ 2,000