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Organization - Additional Information (Details) - USD ($) $ in Thousands							1 Months Ended				6 Months Ended
	Aug. 01, 2026	Dec. 31, 2022	May 01, 2022	Nov. 01, 2021	Oct. 31, 2021	Apr. 30, 2021	Jan. 31, 2026	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Holding transferred		100.00%
Net realized gain (loss) on investments											$ 58,598	$ (30,274)
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				$ 150,000
Percentage of public offering price per notes issued						99.40%				99.40%
Debt instrument, maturity date										May 01, 2026
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				$ 165,000
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
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%