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Derivatives - Open Forward Foreign Currency Contract (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Jun. 30, 2025 CAD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 GBP (£)	Jun. 30, 2025 EUR (€)	Jun. 30, 2025 AUD ($)	Sep. 30, 2024 CAD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 GBP (£)	Sep. 30, 2024 EUR (€)	Sep. 30, 2024 AUD ($)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited
Open Forward Foreign Currency Contract [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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				€ 3,900					€ 3,900
Currency to be purchased		4,371					4,371
Unrealized appreciation		0					0
Unrealized depreciation		(277)					(45)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 11/12/2024
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €									14,650
Currency to be purchased							17,567
Unrealized appreciation							1,225
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 12/23/2024
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €									12,400
Currency to be purchased							14,586
Unrealized appreciation							732
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 12/9/2024
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold						$ 5,200
Currency to be purchased							4,245
Unrealized appreciation							390
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/2/2026
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| £			£ 21,900					£ 21,900
Currency to be purchased		27,811					27,811
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €									26,000
Currency to be purchased							31,803
Unrealized appreciation							2,654
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/5/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €									7,900
Currency to be purchased							8,682
Unrealized appreciation							0
Unrealized depreciation							(152)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/5/2026 Contract 1
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				35,000					35,000
Currency to be purchased		39,008					39,008
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold					$ 26,100					$ 26,100
Currency to be purchased		17,179					17,179
Unrealized appreciation		0					0
Unrealized depreciation		(69)					(761)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 3/17/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| £								5,600
Currency to be purchased							7,321
Unrealized appreciation							0
Unrealized depreciation							(152)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 3/31/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| £								13,945
Currency to be purchased							19,149
Unrealized appreciation							522
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 5/12/2027
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				14,650
Currency to be purchased		16,498
Unrealized appreciation		0
Unrealized depreciation		(1,253)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 5/27/2027
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				20,300
Currency to be purchased		22,346
Unrealized appreciation		0
Unrealized depreciation		(2,228)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 6/15/2029
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation		2,267
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/18/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold						7,000
Currency to be purchased							5,386
Unrealized appreciation							172
Unrealized depreciation							0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/18/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold	$ 7,000
Currency to be purchased		5,386
Unrealized appreciation		242
Unrealized depreciation		0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/21/2025 Contract 1
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| £			8,750					8,750
Currency to be purchased		10,667					10,667
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				20,700					20,700
Currency to be purchased		22,363					22,363
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				10,100					10,100
Currency to be purchased		10,918					10,918
Unrealized appreciation		0					0
Unrealized depreciation		(990)					(430)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/30/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €									16,100
Currency to be purchased							17,902
Unrealized appreciation							0
Unrealized depreciation							(209)
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/30/2025
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				16,100
Currency to be purchased		17,902
Unrealized appreciation		0
Unrealized depreciation		(1,091)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation		46
Unrealized depreciation		(6,909)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc
Open Forward Foreign Currency Contract [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
Open Forward Foreign Currency Contract [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
Open Forward Foreign Currency Contract [Line Items]
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
Open Forward Foreign Currency Contract [Line Items]
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
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation		7,279					9,263
Unrealized depreciation		0					0
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Inc.
Open Forward Foreign Currency Contract [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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				22,000					22,000
Currency to be purchased		24,594					24,594
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				23,750					€ 23,750
Currency to be purchased		26,543					26,543
Unrealized appreciation		0					0
Unrealized depreciation		(1,734)					(425)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 2/2/2026
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold	$ 7,400					$ 7,400
Currency to be purchased		5,533					5,533
Unrealized appreciation		46					0
Unrealized depreciation		0					(4)
Open Forward Foreign Currency Contract, Identifier [Axis]: SMBC Capital Markets, Settlement Date 2/5/2026
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| £			£ 21,900					£ 21,900
Currency to be purchased		27,746					27,811
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
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold \| €				€ 33,200
Currency to be purchased		39,008
Unrealized appreciation		0
Unrealized depreciation		$ (1,309)