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-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended						3 Months Ended		9 Months Ended
	Dec. 15, 2023	Aug. 11, 2023	Mar. 27, 2023	Dec. 15, 2022	Dec. 15, 2021	Dec. 15, 2020	Oct. 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2019	Nov. 30, 2017	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Percentage of managed assets invested															80.00%
Net realized (gain) loss															$ 568	$ (13,520)
Common stock, par value													$ 0.001		$ 0.001		$ 0.001
Common stock shares issued													8,770,000	5,805,484	13,263,436	10,191,661
Common stock issued issued													$ 100,104	$ 64,060	$ 151,075	$ 113,215
Percentage of public offering price per notes issued							101.50%		99.40%
Current ATM Program
Debt Instrument [Line Items]
Common stock shares issued													8,770,000		13,263,436
Weighted average price per share of common stock issued													$ 11.41		$ 11.39
Proceeds from issuance of common stock gross													$ 100,100		$ 150,600
Equity Distribution Agreements
Debt Instrument [Line Items]
Aggregate offering price		$ 250,000
Equity Distribution Agreements \| Current ATM Program
Debt Instrument [Line Items]
Aggregate offering price			$ 100,000
2026 Notes Payable
Debt Instrument [Line Items]
Notes payable to members							$ 85,000		$ 100,000
Percentage of public offering price per notes issued							101.50%		99.40%
Debt instrument, interest rate															4.25%
Debt instrument, maturity date															Apr. 01, 2026
Debt instrument, periodic payment															semi-annually
PennantPark-TSO Senior Loan Fund, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary								$ 81,400
Sale of investments to wholly owned subsidiary in cash								69,500
Sale of investments to wholly owned subsidiary in equity interest								$ 11,900
Percentage of outstanding class A units								23.08%							23.08%
Net realized (gain) loss								$ 400
Capital commitment													$ 15,300		$ 15,300
Voting interest in general partnership															4.99%
First Lien Secured Debt \| Minimum
Debt Instrument [Line Items]
Percentage of overall portfolio															65.00%
Second Lien Secured Debt \| Maximum
Debt Instrument [Line Items]
Percentage of overall portfolio															35.00%
2023 Notes
Debt Instrument [Line Items]
Notes payable to members												$ 138,600
Debt instrument, interest rate										4.30%
Debt instrument, periodic payment															four annual installments
Percentage of original principal amount payable	55.00%			15.00%	15.00%	15.00%
Notes issued												$ 138,600
Interest payment terms															Interest on the 2023 Notes was payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018.
2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of preferred shares of securitization issuer											100.00%
2031 Asset-Backed Debt \| Class D Secured Deferrable Floating Rate Notes
Debt Instrument [Line Items]
Percentage of notes issued by securitization issuer											100.00%