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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
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 gain (loss)	(14,065)	(11,982)
Net change in unrealized depreciation/appreciation	(11,051)	4,858
Purchases, PIK interest, net discount accretion and non-cash exchanges	226,686	564,073
Sales, repayments and non-cash exchanges	(258,075)	(421,003)
Ending Balance	1,048,422	1,157,135
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.	(22,725)	6,543
First lien
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,009,642	934,418
Net realized gain (loss)	(16,268)	1,124
Net change in unrealized depreciation/appreciation	(1,245)	(7,553)
Purchases, PIK interest, net discount accretion and non-cash exchanges	208,709	539,028
Sales, repayments and non-cash exchanges	(253,084)	(404,635)
Ending Balance	950,244	1,062,382
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.	(13,491)	5,627
Second Lien, Subordinated Debt and Equity Investments
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	95,285	86,771
Net realized gain (loss)	(2,203)	(13,106)
Net change in unrealized depreciation/appreciation	(12,296)	12,411
Purchases, PIK interest, net discount accretion and non-cash exchanges	17,977	25,045
Sales, repayments and non-cash exchanges	(4,991)	(16,368)
Ending Balance	98,178	94,753
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.	$ (9,234)	$ 12,170

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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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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