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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Sep. 30, 2025
--- | --- | ---
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | $ 2,683,700 | [1],[2],[3],[4] | $ 2,819,393 | [5],[6],[7],[8]
Fair Value | 2,605,347 | [1],[2],[3],[4],[9] | 2,773,328 | [5],[6],[7],[8],[10]
Cash and cash equivalents at fair value | 40,143 |  | 40,729 |
Investment Owned at Cost and Cash and Cash Equivalents at Carrying Value | 2,778,968 |  | 2,942,077 |
Investment Owned At Fair Value And Cash And Cash Equivalents Fair Value | 2,700,615 |  | 2,896,016 |
First lien |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 2,058,943 |  | 2,289,071 |
Fair Value | 2,033,217 |  | 2,275,982 |
First lien in PSSL |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 237,650 |  | 237,650 |
Fair Value | 237,650 |  | 237,650 |
First Lien In PSSL II |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 39,375 |  | 0 |
Fair Value | 39,375 |  | 0 |
Second lien |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 996 |  | 995 |
Fair Value | 995 |  | 995 |
Subordinate debt |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 18,504 |  | 17,387 |
Fair Value | 19,149 |  | 17,986 |
Equity |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 148,257 |  | 150,565 |
Fair Value | 185,414 |  | 196,397 |
Equity interests in PSSL |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 163,100 |  | 123,725 |
Fair Value | 72,690 |  | 44,318 |
Equity Interests In PSSL II |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cost | 16,875 |  | 0 |
Fair Value | 16,857 |  | 0 |
Cash And Cash Equivalent [Member] |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |
Cash and cash equivalents | 95,268 |  | 122,684 |
Cash and cash equivalents at fair value | $ 95,268 |  | $ 122,688 |
[1] | All of our investments are not registered under the 1933 Act and have restrictions on resale.
[2] | As of December 31, 2025, all investments were in U.S. companies and total cost, fair value, and percentage of Net Assets for the U.S companies were $2,683.7 million, $2,605.3 million, and 250.4%
[3] | The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[4] | The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[5] | All of our investments are not registered under the 1933 Act and have restrictions on resale.
[6] | As of September 30, 2025, all investments were in U.S companies and total cost, fair value, and percentage of Net Assets for the U.S. companies were $2,819.4 million, $2,773.3 million, and 258.1%
[7] | The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[8] | The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[9] | Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[10] | Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).

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