Forward Currency Contracts - Open Forward Foreign Currency Contract (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2023 GBP (£)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 CAD ($)	Sep. 30, 2022 GBP (£)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 CAD ($)
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts		$ 15,745				$ 32,333
Unrealized depreciation on forward currency contracts		(307)				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				£ 10,058
Currency to be purchased		12,706				12,706
Unrealized appreciation on forward currency contracts		270				1,459
Unrealized depreciation on forward currency contracts		0				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		2,698				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		1,797				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				2,228
Currency to be purchased		2,903				2,903
Unrealized appreciation on forward currency contracts		153				408
Unrealized depreciation on forward currency contracts		0				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				13,960
Currency to be purchased		16,735				16,735
Unrealized appreciation on forward currency contracts		1,553				2,778
Unrealized depreciation on forward currency contracts		0				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				6,760
Currency to be purchased		8,044				8,044
Unrealized appreciation on forward currency contracts		692				1,287
Unrealized depreciation on forward currency contracts		0				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		155				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		0				448
Unrealized depreciation on forward currency contracts		(307)				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		601				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		1,031				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		3,192				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		881				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		2,722				5,265
Unrealized depreciation on forward currency contracts		$ 0				$ 0