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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,104,927 $ 1,021,189
Net realized gain (loss) (7,455) (12,681)
Net change in unrealized depreciation/appreciation (13,753) 16,489
Purchases, PIK interest, net discount accretion and non-cash exchanges 145,295 438,933
Sales, repayments and non-cash exchanges (125,646) (338,072)
Ending Balance 1,103,368 1,125,858
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. (16,652,083) 17,385
First lien    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,009,642 934,418
Net realized gain (loss) (6,935) 437
Net change in unrealized depreciation/appreciation (3,837) (609)
Purchases, PIK interest, net discount accretion and non-cash exchanges 131,949 419,465
Sales, repayments and non-cash exchanges (124,123) (321,779)
Ending Balance 1,006,696 1,031,932
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. (6,796,228) 511
Second Lien, Subordinated Debt and Equity Investments    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 95,285 86,771
Net realized gain (loss) (520) (13,118)
Net change in unrealized depreciation/appreciation (9,916) 17,098
Purchases, PIK interest, net discount accretion and non-cash exchanges 13,346 19,468
Sales, repayments and non-cash exchanges (1,523) (16,293)
Ending Balance 96,672 93,926
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. $ (9,855,855) $ 16,874