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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, 2024
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 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 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 $ 1,006,948 $ 1,104,927  
Net realized losses 222 (16,437)  
Net change in unrealized depreciation/appreciation 20,642 (4,969)  
Purchases, PIK interest, net discount accretion and non-cash exchanges 1,409,650 322,512  
Sales, repayments and non-cash exchanges (519,623) (399,085)  
Ending Balance 1,917,839 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. 14,476 (18,684)  
First lien | Level 3      
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 906,166 1,009,642  
Net realized losses (8,125) (18,585)  
Net change in unrealized depreciation/appreciation (77) 7,008  
Purchases, PIK interest, net discount accretion and non-cash exchanges 1,320,051 302,095  
Sales, repayments and non-cash exchanges (471,318) (393,994)  
Ending Balance 1,746,697 906,166 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. (9,278) (9,771)  
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 100,782 95,285  
Net realized losses 8,347 2,148  
Net change in unrealized depreciation/appreciation 20,719 (11,977)  
Purchases, PIK interest, net discount accretion and non-cash exchanges 89,599 20,417  
Sales, repayments and non-cash exchanges (48,305) (5,091)  
Ending Balance 171,142 100,782 $ 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. $ 23,754 $ (8,913)