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Organization - Additional Information (Details) - USD ($)					1 Months Ended				9 Months Ended
	Aug. 01, 2026	Dec. 31, 2022	May 01, 2022	Oct. 31, 2021	Jan. 31, 2026	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Jun. 30, 2026	Jun. 30, 2025
Debt Instrument [Line Items]
Holding transferred		100.00%
Net realized gain (loss) on investments									$ 70,654,000	$ (30,749,000)
PennantPark-TSO Senior Loan Fund II, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary						$ 82,300,000
Sale of investments to wholly owned subsidiary in cash						75,700,000
Sale of investments to wholly owned subsidiary in equity interest						$ 6,600,000
Percentage of outstanding class A units						23.10%			23.10%
Net realized gain (loss) on investments						$ 200,000
Capital commitment									$ 15,000,000
Funded percentage									100.00%
Voting interest in general partnership									4.99%
2026 Notes
Debt Instrument [Line Items]
Aggregate principal amount of notes issued								$ 150,000
Percentage of public offering price per notes issued								99.40%
Debt instrument, effective interest rate								4.62
Debt instrument, periodic payment								semi-annually
Debt instrument, interest rate								4.50%
2026 Notes-2
Debt Instrument [Line Items]
Aggregate principal amount of notes issued				$ 165,000,000			$ 165,000,000
Percentage of public offering price per notes issued				99.40%			99.40%
Debt instrument, maturity date							Nov. 01, 2026
Debt instrument, effective interest rate				4.12
Debt instrument, periodic payment							semiannually
Debt instrument, interest rate			4.00%
2029 Notes
Debt Instrument [Line Items]
Aggregate principal amount of notes issued					$ 75,000,000
Percentage of public offering price per notes issued					99.30%
Debt instrument, maturity date					Feb. 01, 2029
Debt instrument, effective interest rate					7.25
Debt instrument, periodic payment					semiannually
Debt instrument, interest rate	7.00%