Borrowings - Castle Peak Funding Facility (Details) - Revolving Credit Facility - Line of Credit	Jan. 08, 2024	Jun. 30, 2023	May 06, 2022	Jan. 08, 2021	Sep. 30, 2023
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage			0.375%
SOFR
Debt Instrument [Line Items]
Applicable margin rate			1.00%
Castle Peak Funding Facility | Scenario 1
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage		1.85%
Castle Peak Funding Facility | Scenario 2
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage		0.50%
Castle Peak Funding Facility | SOFR | Forecast
Debt Instrument [Line Items]
Increase in rate	1.00%
Low | Castle Peak Funding Facility | Scenario 1
Debt Instrument [Line Items]
Unused capacity threshold percentage					30.00%
Low | Castle Peak Funding Facility | Scenario 2
Debt Instrument [Line Items]
Unused capacity threshold percentage					10.00%
Low | Castle Peak Funding Facility | LIBOR
Debt Instrument [Line Items]
Applicable margin rate				1.50%
Low | Castle Peak Funding Facility | SOFR
Debt Instrument [Line Items]
Applicable margin rate		1.70%
High | Castle Peak Funding Facility | Scenario 2
Debt Instrument [Line Items]
Unused capacity threshold percentage					30.00%
High | Castle Peak Funding Facility | LIBOR
Debt Instrument [Line Items]
Applicable margin rate				2.00%
High | Castle Peak Funding Facility | SOFR
Debt Instrument [Line Items]
Applicable margin rate		2.20%