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Organization - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended			12 Months Ended
	Dec. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Holding transferred	100.00%
Net realized gain (loss) on investments					$ (52,460)	$ (33,833)	$ (151,516)
PennantPark-TSO Senior Loan Fund II, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary		$ 82,300
Sale of investments to wholly owned subsidiary in cash		75,700
Sale of investments to wholly owned subsidiary in equity interest		$ 6,600
Percentage of outstanding class A units		23.10%			23.10%
Net realized gain (loss) on investments		$ 200
Capital commitment					$ 15,000
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, maturity date				May 01, 2026
Debt instrument, periodic payment				semi-annually
Debt instrument, interest rate				4.50%
Basis points				4.62
2026 Notes-2
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 165,000
Percentage of public offering price per notes issued			99.40%
Debt instrument, maturity date			Nov. 01, 2026
Debt instrument, periodic payment			semi-annually
Debt instrument, interest rate			4.00%
Basis points			4.12