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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	Mar. 27, 2023	Dec. 15, 2022	Dec. 15, 2021	Dec. 15, 2020	Aug. 31, 2021	Apr. 30, 2021	Mar. 31, 2020	Sep. 30, 2019	Nov. 30, 2017	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Debt Instrument [Line Items]
Notes payable to members											$ 76,200		$ 76,200		$ 97,000
Net realized (gain) loss													$ (13,520)	$ (11,621)
Common stock, par value											$ 0.001		$ 0.001		$ 0.001
Common stock shares issued											5,805,484	136,072	10,191,661	2,464,910
Common stock issued issued											$ 64,060	$ 1,820	$ 113,215	$ 32,336
Current ATM Program
Debt Instrument [Line Items]
Common stock shares issued											5,805,484		5,891,661
Weighted average price per share of common stock issued											$ 11.03		$ 11.04
Proceeds from issuance of common stock											$ 64,100		$ 65,100
Equity Distribution Agreements \| Current ATM Program
Debt Instrument [Line Items]
Aggregate offering price		$ 100,000
Prior Equity Distribution Agreements \| Current ATM Program
Debt Instrument [Line Items]
Aggregate offering price						$ 75,000
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%
SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity											300,000		$ 300,000
Credit facility basis points													225.00%
Maximum \| SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 366,000		$ 366,000
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			15.00%	15.00%	15.00%
Notes issued										$ 138,600
Interest payment terms													Interest on the 2023 Notes is payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018.
2023 Notes \| Scenario Forecast
Debt Instrument [Line Items]
Percentage of original principal amount payable	55.00%
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%
Floating Rate Loans
Debt Instrument [Line Items]
Percentage of managed assets invested													80.00%