Investments - Schedules of Portfolio Composition by Geographic Region at Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands

9 Months Ended

12 Months Ended

Jun. 30, 2026

Sep. 30, 2025

Schedule of Investments [Line Items]

$ 399,555

$ 385,232

$ 397,960

^[1]

$ 390,128

^[2]

Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

100.00%

100.00%

Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

100.00%

100.00%

Schedule of Investments [Line Items]

$ 82,345

$ 81,814

$ 82,156

$ 83,086

Midwest | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

20.60%

21.30%

Midwest | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

20.60%

21.20%

Schedule of Investments [Line Items]

$ 82,060

$ 84,132

$ 81,838

$ 85,114

Southeast | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

20.50%

21.80%

Southeast | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

20.60%

21.80%

Schedule of Investments [Line Items]

$ 72,949

$ 74,740

$ 72,678

$ 75,648

West | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

18.30%

19.50%

West | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

18.30%

19.40%

Schedule of Investments [Line Items]

$ 63,529

$ 54,273

$ 63,500

$ 54,951

Mid-Atlantic | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

15.90%

14.10%

Mid-Atlantic | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

16.00%

14.10%

Schedule of Investments [Line Items]

$ 53,526

$ 46,747

$ 53,112

$ 47,108

Southwest | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

13.50%

12.10%

Southwest | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

13.30%

12.10%

Schedule of Investments [Line Items]

$ 35,091

$ 32,355

$ 34,569

$ 32,640

Northeast | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

8.80%

8.40%

Northeast | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

8.70%

8.40%

Schedule of Investments [Line Items]

$ 3,695

$ 5,170

$ 3,822

$ 5,369

United Kingdom | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.90%

1.30%

United Kingdom | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

1.00%

1.40%

Schedule of Investments [Line Items]

$ 3,296

$ 2,964

$ 3,151

$ 3,007

Canada | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.80%

0.80%

Canada | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.80%

0.80%

Schedule of Investments [Line Items]

$ 2,478

$ 2,453

$ 2,552

$ 2,603

Sweden | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.60%

0.60%

Sweden | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.60%

0.70%

Schedule of Investments [Line Items]

$ 555

$ 553

$ 547

$ 554

Denmark | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.10%

0.10%

Denmark | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.10%

0.10%

Schedule of Investments [Line Items]

$ 31

$ 31

$ 35

$ 48

Israel | Investments, at Amortized Cost | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.00%

0.00%

Israel | Investments, at Fair Value | Geographic Concentration Risk

Schedule of Investments [Line Items]

Concentration risk, percentage (as a percent)

0.00%

0.00%

[1]	The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 7. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[2]	The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 7. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.