Related Party Transactions - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		53 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026
Related Party Transaction [Line Items]
Base management fee	$ 13,937,000	$ 13,345,000	$ 43,735,000	$ 35,278,000
Investment income incentive fee	13,407,000	12,243,000	42,428,000	33,934,000
Administrator expense	774,000	556,000	2,284,000	1,162,000
Organization expenses	0	3,000	0	5,000
Expense related to distribution or servicing and underwriting fees	2,597,000	2,658,000	$ 8,333,000	7,523,000
Affiliated Entity
Related Party Transaction [Line Items]
Base management fee rate (as a percent)			1.25%
Reimbursement expense			$ 0	0
Reimbursement payments			0	0
Affiliated Entity | Management Fee
Related Party Transaction [Line Items]
Base management fee	13,900,000	13,300,000	$ 43,700,000	35,300,000
Affiliated Entity | Investment Income Incentive Fee, Hurdle Rate, Quarterly
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			1.25%
Affiliated Entity | Investment Income Incentive Fee, Hurdle Rate, Annualized
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			5.00%
Affiliated Entity | Investment Income Incentive Fee, Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			100.00%
Affiliated Entity | Investment Income Incentive Fee, Incentive Rate, Quarterly Catch-Up Threshold
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			1.4286%
Affiliated Entity | Investment Income Incentive Fee, Incentive Rate, Annualized Catch-Up Threshold
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			5.714%
Affiliated Entity | Investment Income Incentive Fee, Incentive Rate, Pre-Incentive Fee Net Investment Income
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			12.50%
Management and incentive rate, not allocated (as a percent)			87.50%
Affiliated Entity | Incentive Fee
Related Party Transaction [Line Items]
Investment income incentive fee	13,400,000	12,200,000	$ 42,400,000	33,900,000
Affiliated Entity | Incentive Rate, Capital Gains Incentive Fee
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			12.50%
Affiliated Entity | Investment Advisory Agreement
Related Party Transaction [Line Items]
Accrued capital gains incentive fees expensed (reversed)	0	100,000	$ 1,200,000	2,400,000	$ 0
Affiliated Entity | Investment Advisory Agreement | Adviser
Related Party Transaction [Line Items]
Agreement termination, written notice period			120 days
Affiliated Entity | Administration Agreement
Related Party Transaction [Line Items]
Expenses under agreement	1,000,000.0	900,000	$ 2,900,000	1,800,000
Administrator expense	800,000	600,000	2,300,000	1,200,000
General and administrative expenses	200,000	100,000	600,000	300,000
Organization expenses	$ 100,000	$ 200,000	$ 100,000	$ 300,000
Affiliated Entity | Administration Agreement | Admnistrator
Related Party Transaction [Line Items]
Agreement termination, written notice period			60 days
Affiliated Entity | Investment Advisory Agreement and Administration Agreement
Related Party Transaction [Line Items]
Agreement termination, written notice period			60 days
Affiliated Entity | Distribution Manager Agreement
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			10.00%
Agreement termination, written notice period			60 days
Affiliated Entity | Distribution Manager Agreement | Class S shares
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			0.85%
Affiliated Entity | Distribution Manager Agreement | Class D shares
Related Party Transaction [Line Items]
Management incentive rate (as a percent)			0.25%
Affiliated Entity | Expense Support and Conditional Reimbursement Agreement
Related Party Transaction [Line Items]
Expense payments by adviser, period (in days)			45 days
Reimbursement payments, period (in years)					3 years