Derivatives - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited
Derivative [Line Items]
Unrealized appreciation	$ 242	$ 5,695
Unrealized depreciation	(14,223)	(5,469)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 1/30/2026
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(277)	(45)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 11/12/2024
Derivative [Line Items]
Unrealized appreciation		1,225
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 12/23/2024
Derivative [Line Items]
Unrealized appreciation		732
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 12/9/2024
Derivative [Line Items]
Unrealized appreciation		390
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/2/2026
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(2,221)	(1,244)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/27/2025
Derivative [Line Items]
Unrealized appreciation		2,654
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/5/2025
Derivative [Line Items]
Unrealized appreciation		0
Unrealized depreciation		(152)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/5/2026 Contract 1
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(2,712)	(618)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/5/2026 Contract 2
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(69)	(761)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 3/17/2025
Derivative [Line Items]
Unrealized appreciation		0
Unrealized depreciation		(152)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 3/31/2025
Derivative [Line Items]
Unrealized appreciation		522
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 5/12/2027
Derivative [Line Items]
Unrealized appreciation	0
Unrealized depreciation	(1,253)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 5/27/2027
Derivative [Line Items]
Unrealized appreciation	0
Unrealized depreciation	$ (2,228)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 6/15/2029
Derivative [Line Items]
Company receives (as a percent)	5.881%
Company pays (as a percent)	2.012%
Notional amount	$ 150,000
Unrealized appreciation	2,267
Unrealized depreciation	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/18/2025
Derivative [Line Items]
Unrealized appreciation		172
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/18/2025
Derivative [Line Items]
Unrealized appreciation	242
Unrealized depreciation	0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/21/2025 Contract 1
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(1,340)	(964)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/21/2025 Contract 2
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(2,042)	(894)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/21/2025 Contract 3
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(990)	(430)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/30/2025
Derivative [Line Items]
Unrealized appreciation		0
Unrealized depreciation		(209)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/30/2025
Derivative [Line Items]
Unrealized appreciation	0
Unrealized depreciation	(1,091)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets
Derivative [Line Items]
Unrealized appreciation	46
Unrealized depreciation	(6,909)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc
Derivative [Line Items]
Unrealized appreciation	17,592	31,486
Unrealized depreciation	0	$ 0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc and Macquarie Bank Limited
Derivative [Line Items]
Unrealized appreciation	2,267
Unrealized depreciation	$ 0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc, Settlement Date 11/5/2028 contract 1
Derivative [Line Items]
Company receives (as a percent)	7.31%	7.31%
Company pays (as a percent)	3.327%	3.327%
Notional amount	$ 225,000	$ 225,000
Unrealized appreciation	3,403	8,925
Unrealized depreciation	$ 0	$ 0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc, Settlement Date 11/5/2028 contract 2
Derivative [Line Items]
Company receives (as a percent)	7.31%	7.31%
Company pays (as a percent)	2.835%	2.835%
Notional amount	$ 225,000	$ 225,000
Unrealized appreciation	6,910	13,298
Unrealized depreciation	$ 0	$ 0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc, Settlement Date 6/15/2029
Derivative [Line Items]
Company receives (as a percent)	6.248%	6.248%
Company pays (as a percent)	2.444%	2.444%
Notional amount	$ 600,000	$ 600,000
Unrealized appreciation	7,279	9,263
Unrealized depreciation	0	0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc.
Derivative [Line Items]
Unrealized appreciation		0
Unrealized depreciation		(2,222)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 1/20/2026 Contract 1
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(1,600)	(387)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 1/20/2026 Contract 2
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(1,734)	(425)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 2/2/2026
Derivative [Line Items]
Unrealized appreciation	46	0
Unrealized depreciation	0	(4)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 2/5/2026
Derivative [Line Items]
Unrealized appreciation	0	0
Unrealized depreciation	(2,266)	$ (1,406)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 5/27/2027 Contract 5
Derivative [Line Items]
Unrealized appreciation	0
Unrealized depreciation	$ (1,309)

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fixed interest rate related to the interest rate derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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