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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	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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
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 appreciation (depreciation) on investments and debt
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 gain (loss)	921	(7,455)
Net change in unrealized depreciation/appreciation	11,317	(13,753)
Purchases, PIK interest, net discount accretion and non-cash exchanges	647,303	145,295
Sales, repayments and non-cash exchanges	(251,423)	(125,646)
Ending Balance	1,415,066	1,103,368
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.	7,152	(16,652,083)
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 gain (loss)	(4,920)	(6,935)
Net change in unrealized depreciation/appreciation	6,393	(3,837)
Purchases, PIK interest, net discount accretion and non-cash exchanges	617,010	131,949
Sales, repayments and non-cash exchanges	(206,608)	(124,123)
Ending Balance	1,318,041	1,006,696
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.	(340)	(6,796,228)
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 gain (loss)	5,841	(520)
Net change in unrealized depreciation/appreciation	4,924	(9,916)
Purchases, PIK interest, net discount accretion and non-cash exchanges	30,293	13,346
Sales, repayments and non-cash exchanges	(44,815)	(1,523)
Ending Balance	97,025	96,672
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.	$ 7,492	$ (9,855,855)

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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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-Topic 820
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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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Fair value of financial instrument classified as 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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