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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	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
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 and debt	Net change in unrealized appreciation (depreciation) 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	$ 1,104,927	$ 1,021,189
Net realized losses	63	2,778
Net change in unrealized depreciation/appreciation	(10,845)	(1,151)
Purchases, PIK interest, net discount accretion and non-cash exchanges	62,667	331,651
Sales, repayments and non-cash exchanges	(62,998)	(234,214)
Ending Balance	1,093,814	1,120,253
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.	(8,198)	(153)
First lien | Level 3
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,009,642	934,418
Net realized losses	50	(87)
Net change in unrealized depreciation/appreciation	(7,399)	(211)
Purchases, PIK interest, net discount accretion and non-cash exchanges	58,636	318,967
Sales, repayments and non-cash exchanges	(62,720)	(228,249)
Ending Balance	998,209	1,024,838
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.	(4,830)	679
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	86,771
Net realized losses	13	2,865
Net change in unrealized depreciation	(3,446)	(940)
Purchases, PIK interest, net discount accretion and non-cash exchanges	4,031	12,684
Sales, repayments and non-cash exchanges	(278)	(5,965)
Ending Balance	95,605	95,415
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.	$ (3,368)	$ (832)

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Fair value net derivative asset liability measured on recurring basis with unobservable inputs unrealized appreciation depreciation.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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