Forward Currency Contracts - Open Forward Foreign Currency Contract (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2023 CAD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 GBP (£)	Sep. 30, 2023 EUR (€)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 EUR (€)
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts		$ 15,011				$ 32,333
Unrealized depreciation on forward currency contracts		(70)				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 07/17/2023
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £							£ 10,058
Currency to be purchased						12,706
Unrealized appreciation on forward currency contracts						1,459
Unrealized depreciation on forward currency contracts						0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 10/30/2023
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold					$ 18,425
Currency to be purchased						13,783
Unrealized appreciation on forward currency contracts						372
Unrealized depreciation on forward currency contracts						0
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				€ 26,000
Currency to be purchased		31,803				31,803
Unrealized appreciation on forward currency contracts		3,397				4,637
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 2/28/2023
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £							8,925
Currency to be purchased						11,219
Unrealized appreciation on forward currency contracts						1,226
Unrealized depreciation on forward currency contracts						0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 3/27/2023
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £							3,780
Currency to be purchased						4,804
Unrealized appreciation on forward currency contracts						572
Unrealized depreciation on forward currency contracts						0
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				13,945
Currency to be purchased		19,149				19,149
Unrealized appreciation on forward currency contracts		1,968				3,538
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 4/28/2023 Contract 1
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £							2,228
Currency to be purchased						2,903
Unrealized appreciation on forward currency contracts						408
Unrealized depreciation on forward currency contracts						0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 4/28/2023 Contract 2
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | €								13,960
Currency to be purchased						16,735
Unrealized appreciation on forward currency contracts						2,778
Unrealized depreciation on forward currency contracts						0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 4/28/2023 Contract 3
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | €								6,760
Currency to be purchased						8,044
Unrealized appreciation on forward currency contracts						1,287
Unrealized depreciation on forward currency contracts						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				7,000
Currency to be purchased		5,386				5,386
Unrealized appreciation on forward currency contracts		203				236
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 7/21/2025
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 on forward currency contracts						448
Unrealized depreciation on forward currency contracts		(70)				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 8/27/2024 Contract 1
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold	15,600				25,000
Currency to be purchased		12,236				19,609
Unrealized appreciation on forward currency contracts		676				1,267
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 8/27/2024 Contract 2
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold	30,000				30,000
Currency to be purchased		23,399				23,399
Unrealized appreciation on forward currency contracts		1,174				1,399
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 8/27/2024 Contract 3
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £			25,000				25,000
Currency to be purchased		34,298				34,298
Unrealized appreciation on forward currency contracts		3,570				6,285
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 8/30/2024
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold	$ 22,600				$ 22,600
Currency to be purchased		17,739				17,739
Unrealized appreciation on forward currency contracts		991				1,156
Unrealized depreciation on forward currency contracts		0				0
Open Forward Foreign Currency Contract, Identifier [Axis]: Macquarie Bank Limited, Settlement Date 9/03/2024
Open Forward Foreign Currency Contract [Line Items]
Currency to be sold | £			£ 20,550				£ 20,550
Currency to be purchased		28,297				28,297
Unrealized appreciation on forward currency contracts		3,032				5,265
Unrealized depreciation on forward currency contracts		$ 0				$ 0