Borrowings - Revolving Credit Facilities Narrative (Details) - USD ($) $ in Thousands													10 Months Ended	12 Months Ended
	Apr. 12, 2026	Sep. 13, 2022	Sep. 02, 2022	Nov. 23, 2021	Nov. 19, 2021	Oct. 14, 2021	Apr. 14, 2021	Apr. 13, 2021	Feb. 23, 2021	Jan. 29, 2021	Oct. 23, 2020	Jun. 17, 2020	Apr. 13, 2021	Sep. 30, 2022	Sep. 16, 2022	Dec. 17, 2021	Sep. 30, 2021	Oct. 08, 2020	Feb. 01, 2019
Debt Instrument [Line Items]
Debt														$ 3,093,603			$ 2,569,228
JPM Credit Facility
Debt Instrument [Line Items]
Debt														$ 692,592
Revolving Credit Facility | MS Credit Facility II | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, increase (decrease), net									$ 175,000	$ (250,000)	$ (75,000)
Line of credit facility, current borrowing capacity									$ 75,000	$ 325,000	$ 325,000
Line of credit facility, non-usage fee, percentage																			0.50%
Revolving Credit Facility | MS Credit Facility II | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, interest rate during period	2.55%
Revolving Credit Facility | MS Credit Facility II | Line of Credit | Base Rate
Debt Instrument [Line Items]
Line of credit facility, interest rate during period							2.55%	2.05%				2.05%	2.45%
Revolving Credit Facility | MS Credit Facility II | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														1 month
Revolving Credit Facility | MS Credit Facility II | Line of Credit | EURIBOR
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														1 month
Revolving Credit Facility | MS Credit Facility II | Line of Credit | Canadian Dollar Offered Rate
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														1 month
Revolving Credit Facility | WF Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity															$ 300,000
Revolving Credit Facility | WF Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Line of credit facility, non-usage fee, percentage														0.50%
Revolving Credit Facility | WF Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Line of credit facility, non-usage fee, percentage														1.75%
Revolving Credit Facility | WF Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, interest rate during period								2.00%
Revolving Credit Facility | DB Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, non-usage fee, percentage														0.25%
Line of credit facility, maximum borrowing capacity																		$ 250,000
Line of credit facility, aggregate commitments each day, percentage														0.25%
Revolving Credit Facility | DB Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Line of credit facility, interest rate during period								1.90%
Revolving Credit Facility | DB Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														3 months
Revolving Credit Facility | DB Credit Facility | Line of Credit | EURIBOR
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														3 months
Revolving Credit Facility | DB Credit Facility | Line of Credit | Canadian Dollar Offered Rate
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														3 months
Revolving Credit Facility | DB Credit Facility | Line of Credit | Bank Bill Swap Rate
Debt Instrument [Line Items]
Federal home loan bank, advances, maturity period, variable rate														3 months
Revolving Credit Facility | JPM Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, increase (decrease), net				$ 687,500		$ 687,500								$ 262,500
Line of credit facility, current borrowing capacity				$ 1,037,500		475,000									1,187,500	$ 1,187,500
Line of credit facility, maximum borrowing capacity					$ 1,500,000	$ 712,500								$ 1,237,500	$ 1,237,500
Line of credit facility, commitment fee percentage														0.375%
Debt instrument, amortization period														1 year
Debt														$ 692,592			$ 472,102
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Base Rate Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, gross borrowing base, outstanding indebtedness percentage														160.00%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Base Rate Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, gross borrowing base, combined debt percentage														160.00%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Eurocurrency Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, gross borrowing base, combined debt percentage					160.00%									160.00%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, gross borrowing base, combined debt percentage					160.00%									160.00%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Base Rate Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														1.00%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Eurocurrency Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														1.75%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														1.875%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Line of credit facility, interest rate during period		0.11448%	0.11448%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt Instrument [Line Items]
Line of credit facility, interest rate during period		0.42826%	0.42826%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Overnight Bank Funding Rate | Base Rate Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														0.50%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Alternative Base Rate | Base Rate Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														0.75%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Alternative Base Rate | Base Rate Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														0.875%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | SONIA | Eurocurrency Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					1.7826%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | SONIA | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					1.9076%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | Swiss Average Overnight Rate | Eurocurrency Option - Equal To Or Greater Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					1.6929%
Revolving Credit Facility | JPM Credit Facility | Line of Credit | SARON | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					1.8179%
Revolving Credit Facility | SLF Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, commitment fee amount														$ 12,500
Revolving Credit Facility | SLF Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														2.05%
Revolving Credit Facility | GCIC SLF Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, commitment fee amount														$ 7,500
Revolving Credit Facility | GCIC SLF Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, interest rate during period														2.05%
Letter of Credit | JPM Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity														$ 23,750