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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, 2023
Sep. 30, 2022
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] Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Level 3    
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 losses (16,437) (11,464)
Net change in unrealized depreciation/appreciation (4,969) (6,006)
Purchases, PIK interest, net discount accretion and non-cash exchanges 322,512 620,192
Sales, repayments and non-cash exchanges (399,085) (518,984)
Ending Balance 1,006,948 1,104,927
Net change in unrealized appreciation reported within the net change in unrealized appreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. (18,684) (3,663)
First lien | Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,009,642 934,419
Net realized losses (18,585) 894
Net change in unrealized depreciation/appreciation 7,008 (17,661)
Purchases, PIK interest, net discount accretion and non-cash exchanges 302,095 593,144
Sales, repayments and non-cash exchanges (393,994) (501,154)
Ending Balance 906,166 1,009,642
Net change in unrealized appreciation reported within the net change in unrealized appreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. (9,771) (15,247)
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 95,285 86,770
Net realized losses 2,148 (12,358)
Net change in unrealized depreciation/appreciation (11,977) 11,655
Purchases, PIK interest, net discount accretion and non-cash exchanges 20,417 27,048
Sales, repayments and non-cash exchanges (5,091) (17,830)
Ending Balance 100,782 95,285
Net change in unrealized appreciation reported within the net change in unrealized appreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. $ (8,913) $ 11,584