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Investments - Summary of PSLF's Portfolio at Fair Value (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Portfolio
Sep. 30, 2025
USD ($)
Portfolio
Schedule Of Investments [Line Items]    
Investments at fair value $ 1,203,513 [1],[2],[3],[4],[5] $ 1,287,273 [6],[7],[8],[9],[10]
PSLF    
Schedule Of Investments [Line Items]    
Investments at fair value $ 1,314,347 $ 1,265,901
Weighted average cost yield on income producing investments 9.60% 10.10%
Number of portfolio companies in PSLF | Portfolio 114 109
Largest portfolio company investment at fair value $ 26,443 $ 24,802
Total of five largest portfolio company investments at fair value $ 124,702 $ 121,360
[1] All investments are in US Companies unless noted otherwise. Total cost, fair value, and percentage of Net Assets for the U.S. Companies were $1,168.3 million, $1,100.9 million, and 250.6%
[2] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[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 (See Note 6).
[5] Valued based on our accounting policy (See Note 2).
[6] All investments are in US Companies unless noted otherwise. Total cost, fair value, and percentage of Net Assets for the U.S. Companies were $1,181.8 million, $1,198.6 million, and 258.4%
[7] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[8] Non-income producing securities.
[9] 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.
[10] 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 (See Note 6).