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Organization - Additional Information (Details) - USD ($)						1 Months Ended					3 Months Ended		6 Months Ended		19 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	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Sep. 30, 2022	Aug. 20, 2021
Debt Instrument [Line Items]
Notes payable to members											$ 76,200,000		$ 76,200,000		$ 76,200,000	$ 97,000,000.0
Net realized gain (loss) on investments													$ (7,455,000)	$ (12,322,000)
Common stock, par value											$ 0.001		$ 0.001		$ 0.001	$ 0.001
Common stock shares issued											4,300,000	2,058,772	4,386,177	2,328,838
Common stock issued issued											$ 48,159,000	$ 26,995,000	$ 49,154,000	$ 30,514,000
2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of preferred shares of securitization issuer									100.00%
2023 Notes
Debt Instrument [Line Items]
Notes payable to members										$ 138,600,000
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										$ 138,600,000
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%
Class D Secured Deferrable Floating Rate Notes \| 2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of notes issued by securitization issuer									100.00%
Current ATM Program
Debt Instrument [Line Items]
Common stock shares issued													0
Prior ATM Program
Debt Instrument [Line Items]
Common stock shares issued													86,177		2,659,741
Weighted average price per share of common stock issued													$ 11.54		$ 13.06
Proceeds from issuance of common stock gross													$ 1,000,000.0		$ 34,700,000
Proceeds from issuance of common stock													$ 1,000,000.0		34,200,000
Common stock issued issued															500,000
Equity Distribution Agreements \| Current ATM Program
Debt Instrument [Line Items]
Common stock, par value		$ 0.001
Aggregate offering price		$ 100,000,000
Prior Equity Distribution Agreements \| Prior ATM Program
Debt Instrument [Line Items]
Common stock, par value																	$ 0.001
Aggregate offering price						$ 75,000,000
PennantPark-TSO Senior Loan Fund, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary							$ 81,400,000
Sale of investments to wholly owned subsidiary in cash							69,500,000
Sale of investments to wholly owned subsidiary in equity interest							$ 11,900,000
Percentage of outstanding class A units							23.08%						23.08%
Net realized gain (loss) on investments							$ 400,000
Capital commitment											15,300,000		$ 15,300,000		15,300,000
Voting interest in general partnership													4.99%
SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity											300,000,000		$ 300,000,000		300,000,000
Credit facility basis points													225.00%
Maximum \| SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 366,000,000		$ 366,000,000		$ 366,000,000
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%
Floating Rate Loans
Debt Instrument [Line Items]
Percentage of managed assets invested													80.00%