XML 50 R43.htm IDEA: XBRL DOCUMENT v3.25.1
Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Net change in unrealized depreciation/appreciation   Net change in unrealized appreciation (depreciation) on investments Net change in unrealized appreciation (depreciation) on investments
Net change in unrealized appreciation (depreciation) reported Net change in unrealized appreciation (depreciation) on investments   Net change in unrealized appreciation (depreciation) on investments
Level 3      
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance   $ 1,917,839 $ 1,006,948
Net realized gain (loss)   23,197 921
Net change in unrealized depreciation/appreciation   (30,449) 11,317
Purchases, PIK interest, net discount accretion and non-cash exchanges   888,869 647,303
Sales, repayments and non-cash exchanges   (523,668) (251,423)
Ending Balance $ 2,275,788 2,275,788 1,415,066
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date.   (6,656) 7,152
First lien | Level 3      
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance   1,746,697 906,166
Net realized gain (loss)   879 (4,920)
Net change in unrealized depreciation/appreciation   (18,852) 6,393
Purchases, PIK interest, net discount accretion and non-cash exchanges   870,397 617,010
Sales, repayments and non-cash exchanges   (498,948) (206,608)
Ending Balance 2,100,173 2,100,173 1,318,041
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date.   (14,454) (340)
Second Lien, Subordinated Debt and Equity Investments | Level 3      
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance   171,142 100,782
Net realized gain (loss)   22,318 5,841
Net change in unrealized depreciation/appreciation   (11,597) 4,924
Purchases, PIK interest, net discount accretion and non-cash exchanges   18,472 30,293
Sales, repayments and non-cash exchanges   (24,720) (44,815)
Ending Balance $ 175,615 175,615 97,025
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date.   $ 7,798 $ 7,492