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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Change In Unrealized Depreciation Appreciation On Investments And Debt Net Change In Unrealized Depreciation Appreciation On Investments And Debt
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Change In Unrealized Depreciation Appreciation On Investments And Debt Net Change In Unrealized Depreciation Appreciation On Investments And Debt
Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,021,189 $ 1,047,018
Net realized losses (11,464) (11,951)
Net change in unrealized depreciation/appreciation (6,006) 42,450
Purchases, PIK interest, net discount accretion and non-cash exchanges 620,192 645,801
Sales, repayments and non-cash exchanges (518,984) (702,129)
Ending Balance 1,104,927 1,021,189
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. (3,663) 40,338
First lien | Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 934,419 968,616
Net realized losses 894 (3,731)
Net change in unrealized depreciation/appreciation (17,661) 16,326
Purchases, PIK interest, net discount accretion and non-cash exchanges 593,144 630,324
Sales, repayments and non-cash exchanges (501,154) (677,116)
Ending Balance 1,009,642 934,419
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. (15,247) 10,313
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 86,770 78,402
Net realized losses (12,358) (8,220)
Net change in unrealized depreciation/appreciation 11,655 26,124
Purchases, PIK interest, net discount accretion and non-cash exchanges 27,048 15,477
Sales, repayments and non-cash exchanges (17,830) (25,013)
Ending Balance 95,285 86,770
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. $ 11,584 $ 30,025