Borrowings - Additional Information (Details) - USD ($)									3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 07, 2024	Dec. 31, 2023	Dec. 21, 2023	Nov. 15, 2023	Aug. 15, 2023	Nov. 21, 2022	Nov. 20, 2022	Dec. 21, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Apr. 18, 2024	Apr. 08, 2024	Apr. 07, 2024	Mar. 21, 2024	Sep. 08, 2023	Sep. 07, 2023	Dec. 16, 2022	Dec. 15, 2022
Debt Instrument [Line Items]
Maximum commitment amount		$ 1,570,025,000							$ 2,321,977,000		$ 2,321,977,000		$ 1,570,025,000
Aggregate face amount									2,026,171,000	$ 814,490,000	1,654,321,000	$ 718,060,000
Outstanding repurchase obligations		50,025,000							251,977,000		$ 251,977,000		50,025,000
SPV I Facility
Debt Instrument [Line Items]
Commitment fee						0.25%
Commitment fee description											0.50% per annum if borrowings are less than 75% of the commitment amount
Percentage of administrative agent fee						0.25%
Maximum commitment amount		485,000,000							550,000,000		$ 550,000,000		$ 485,000,000		$ 550,000,000	$ 485,000,000				$ 485,000,000	$ 400,000,000
Maturity date											Apr. 08, 2029		Dec. 21, 2026
SPV II Facility
Debt Instrument [Line Items]
Commitment fee					0.25%
Commitment fee description											0.50% per annum if borrowings are less than 75% of the commitment amount
Maximum commitment amount		445,000,000							595,000,000		$ 595,000,000		$ 445,000,000	$ 595,000,000			$ 495,000,000	$ 445,000,000	$ 370,000,000
Maturity date											Aug. 15, 2028		Aug. 15, 2028
Subscription Facility
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
Commitment fee			0.35%
Maximum commitment amount		200,000,000						$ 200,000,000	200,000,000		$ 200,000,000		$ 200,000,000
Maturity date											Dec. 18, 2024		Dec. 18, 2024
Aggregate face amount								$ 40,000,000
2023 Debt Securitization
Debt Instrument [Line Items]
Debt securitization				$ 600,000,000
Notes maturity date											Oct. 15, 2035
Collateral Management Agreement
Debt Instrument [Line Items]
Base management fee				0
Subordinated management fee				0
Incentive management fee				$ 0
Macquarie Bank Limited | Repurchase Obligations
Debt Instrument [Line Items]
Outstanding repurchase obligations		$ 50,000,000							252,000,000		$ 252,000,000		$ 50,000,000
SOFR | SPV I Facility
Debt Instrument [Line Items]
Basis spread on variable rate						2.41%
Debt Investment Interest Rate Floor						0.25%
SOFR | SPV II Facility
Debt Instrument [Line Items]
Basis spread on variable rate					2.75%
Debt Investment Interest Rate Floor					0.00%
3 Month SOFR | Macquarie Bank Limited | Repurchase Obligations
Debt Instrument [Line Items]
Basis spread on variable rate											3.50%		3.50%
LIBOR | SPV I Facility
Debt Instrument [Line Items]
Basis spread on variable rate							2.15%
Debt Investment Interest Rate Floor							0.25%
BSBY | Subscription Facility
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Commitment fee		0.25%
Credit Spread Adjustment | SPV I Facility
Debt Instrument [Line Items]
Basis spread on variable rate						0.26%
Minimum | Macquarie Bank Limited | Repurchase Obligations
Debt Instrument [Line Items]
Repurchase agreements remaining contractual maturities													32 days
Maximum | Macquarie Bank Limited | Repurchase Obligations
Debt Instrument [Line Items]
Repurchase term											90 days
Repurchase agreements remaining contractual maturities													43 days
Preferred Shares | SOFR | 2023 Debt Securitization
Debt Instrument [Line Items]
Basis spread on variable rate				4.00%
Debt securitization				$ 163,600,000
Class A Notes | 2023 Debt Securitization
Debt Instrument [Line Items]
Debt securitization				$ 336,000,000
Class B Notes | SOFR | 2023 Debt Securitization
Debt Instrument [Line Items]
Basis spread on variable rate				2.70%
Debt securitization				$ 54,000,000
Class C Notes | SOFR | 2023 Debt Securitization
Debt Instrument [Line Items]
Basis spread on variable rate				3.65%
Debt securitization				$ 36,000,000
Series A Notes
Debt Instrument [Line Items]
Maximum commitment amount									69,000,000		$ 69,000,000
Maturity date											May 09, 2027
Debt securitization	$ 69,000,000
Debt instrument interest rate percentage	7.00%
Series B Notes
Debt Instrument [Line Items]
Maximum commitment amount									75,000,000		$ 75,000,000
Maturity date											May 09, 2029
Debt securitization	$ 75,000,000
Series B Notes | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	3.05%
Series C Notes
Debt Instrument [Line Items]
Maximum commitment amount									116,000,000		$ 116,000,000
Maturity date											May 09, 2027
Debt securitization	$ 116,000,000
Debt instrument interest rate percentage	7.11%
Series D Notes
Debt Instrument [Line Items]
Maximum commitment amount									$ 75,000,000		$ 75,000,000
Maturity date											May 09, 2029
Debt securitization	$ 75,000,000
Series D Notes | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	3.35%
Series A Notes and Series C Notes
Debt Instrument [Line Items]
Redemption price percentage											100.00%
Series B Notes and Series D Notes
Debt Instrument [Line Items]
Redemption price percentage											100.00%